SQLite Techniques

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joaopmaia
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SQLite Techniques Ben Scheirman @subdigital Code / Slides: github.com/subdigital/iphonedevcon- sandiego Tuesday, September 28, 2010
SQLite is.... Single-user File-based Simple Cross Platform A subset of full ANSI SQL Tuesday, September 28, 2010
SQLite API Pure C API Lots of strange-looking, hard to debug code Best choice is to abstract it away Tuesday, September 28, 2010
SQLite Tools SQLite Manager Add-in for Firefox sqlite3 command line utility Tuesday, September 28, 2010
Writable Databases Your app bundle is signed! (That means the contents can't change) Tuesday, September 28, 2010
Your App Sandbox Your App Bundle Resources Documents Tuesday, September 28, 2010
Your App Sandbox Your App Bundle Resources Documents Tuesday, September 28, 2010
Creating the database Tuesday, September 28, 2010
Getting Resource Paths Tuesday, September 28, 2010
Getting Resource Paths //fetches  path  for  foo.db Tuesday, September 28, 2010
Getting Resource Paths //fetches  path  for  foo.db NSString  *resourcePath  =  [[NSBundle  mainBundle] Tuesday, September 28, 2010
Getting Resource Paths //fetches  path  for  foo.db NSString  *resourcePath  =  [[NSBundle  mainBundle]                                                          pathForResource:@"foo" Tuesday, September 28, 2010
Getting Resource Paths //fetches  path  for  foo.db NSString  *resourcePath  =  [[NSBundle  mainBundle]                                                          pathForResource:@"foo"                                                          ofType:@"db"]; Tuesday, September 28, 2010
Finding the Documents Directory Tuesday, September 28, 2010
Finding the Documents Directory NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(   Tuesday, September 28, 2010
Finding the Documents Directory NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(                                                        NSDocumentDirectory,   Tuesday, September 28, 2010
Finding the Documents Directory NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(                                                        NSDocumentDirectory,                                                        NSUserDomainMask,   Tuesday, September 28, 2010
Finding the Documents Directory NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(                                                        NSDocumentDirectory,                                                        NSUserDomainMask,                                                        YES); Tuesday, September 28, 2010
Finding the Documents Directory NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(                                                        NSDocumentDirectory,                                                        NSUserDomainMask,                                                        YES); NSString  *documentsDirectory  =  [paths  objectAtIndex:0]; Tuesday, September 28, 2010
Copy a default database on startup Tuesday, September 28, 2010
Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
SQLite API Basics Tuesday, September 28, 2010
Add the Framework Tuesday, September 28, 2010
Add the Framework Tuesday, September 28, 2010
Add the Framework Tuesday, September 28, 2010
Add the Framework Tuesday, September 28, 2010
SQLite API - Opening a connection Tuesday, September 28, 2010
SQLite API - Opening a connection #import "sqlite3.h" Tuesday, September 28, 2010
SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; Tuesday, September 28, 2010
SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); Tuesday, September 28, 2010
SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { Tuesday, September 28, 2010
SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { [NSException raise:@"SQLITE ERROR" Tuesday, September 28, 2010
SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { [NSException raise:@"SQLITE ERROR" format:@"Error %d", result]; Tuesday, September 28, 2010
SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { [NSException raise:@"SQLITE ERROR" format:@"Error %d", result]; } Tuesday, September 28, 2010
SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { [NSException raise:@"SQLITE ERROR" format:@"Error %d", result]; } //later Tuesday, September 28, 2010
SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { [NSException raise:@"SQLITE ERROR" format:@"Error %d", result]; } //later sqlite3_close(db); Tuesday, September 28, 2010
SQLite API - executing queries Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); //callback signature Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); //callback signature int RowCallback(void * context, Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); //callback signature int RowCallback(void * context, int numColumns, Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); //callback signature int RowCallback(void * context, int numColumns, char** colValues, Tuesday, September 28, 2010
SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); //callback signature int RowCallback(void * context, int numColumns, char** colValues, char ** colNames); Tuesday, September 28, 2010
SQLite API - Prepared Statements More Powerful Unfortunately much more code! Tuesday, September 28, 2010
SQLite API-Prepared Statements Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error } Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error } //... Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error } //... Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error } //... Tuesday, September 28, 2010
SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error } //... Tuesday, September 28, 2010
SQLite API-Prepared Statements Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; result = sqlite3_step(stmt); Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; result = sqlite3_step(stmt); } Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; result = sqlite3_step(stmt); } sqlite_finalize(stmt); Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; result = sqlite3_step(stmt); } sqlite_finalize(stmt); Tuesday, September 28, 2010
SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; result = sqlite3_step(stmt); } sqlite_finalize(stmt); return results; Tuesday, September 28, 2010
SQLite API-Prepared Statements Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling } Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling } [row setObject:value forKey: Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling } [row setObject:value forKey: [NSString stringWithUTF8String:colName]]; Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling } [row setObject:value forKey: [NSString stringWithUTF8String:colName]]; } Tuesday, September 28, 2010
SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling } [row setObject:value forKey: [NSString stringWithUTF8String:colName]]; } } Tuesday, September 28, 2010
FMDB http://github.com/ccgus/fmdb Tuesday, September 28, 2010
FMDB Usage Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"]; Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open]) Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db."); Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"]; Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];      Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError]) Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]); Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"]; Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction]; Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0; Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) { Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) {   [db executeUpdate:@"insert into test (a, b) values (?, ?)" , Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) {   [db executeUpdate:@"insert into test (a, b) values (?, ?)" ,        @"hi'", // look! I put in a ', and I'm not escaping it! Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) {   [db executeUpdate:@"insert into test (a, b) values (?, ?)" ,        @"hi'", // look! I put in a ', and I'm not escaping it!        [NSNumber numberWithInt:i]]; Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) {   [db executeUpdate:@"insert into test (a, b) values (?, ?)" ,        @"hi'", // look! I put in a ', and I'm not escaping it!        [NSNumber numberWithInt:i]];   } Tuesday, September 28, 2010
FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) {   [db executeUpdate:@"insert into test (a, b) values (?, ?)" ,        @"hi'", // look! I put in a ', and I'm not escaping it!        [NSNumber numberWithInt:i]];   }   [db commit]; Tuesday, September 28, 2010
What about updates? Database is never copied over again If we did, your customers would lose data Tuesday, September 28, 2010
Migrations Concept from Ruby on Rails Evolutionary database design Each database has a "version" App runs all migrations to the latest version Tuesday, September 28, 2010
Migrations number name 1 initial_schema 2 update_foo 3 implement_blah Tuesday, September 28, 2010
Migrations number name 1 initial_schema 2 update_foo 3 implement_blah Tuesday, September 28, 2010
Hand-rolled Database Migrator DEMO Tuesday, September 28, 2010
FMDB Migration Manager http://github.com/mocra/fmdb- migration-manager Tuesday, September 28, 2010
FMDB Migration Manager NSArray *migrations = [NSArray arrayWithObjects: [CreateStudents migration], // 1 [CreateStaffMembers migration], // 2 [AddStudentNumberToStudents migration], // 3 nil ]; [FmdbMigrationManager executeForDatabasePath:@"/tmp/tmp.db" withMigrations:migrations]; Tuesday, September 28, 2010
FMDB Migration Manager @interface CreateStudents : FmdbMigration { } @end @implementation CreateStudents - (void)up { [self createTable:@"students" withColumns:[NSArray arrayWithObjects: [FmdbMigrationColumn columnWithColumnName:@"first_name" columnType:@"string"], [FmdbMigrationColumn columnWithColumnName:@"age" columnType:@"integer" defaultValue:21], nil]; } - (void)down { [self dropTable:@"students"]; } @end Tuesday, September 28, 2010
ActiveRecord Person *p = [[Person alloc] init]; p.name = @"Joe"; p.occupation = @"Dishwasher"; [p save]; Person *p = [Person personWithId:5]; ==> Person {id:5, name:Joe, occupation:Dishwasher} Tuesday, September 28, 2010
Aptiva's ActiveRecord http://github.com/aptiva/activerecord (YMMV) Tuesday, September 28, 2010
Questions? Tuesday, September 28, 2010
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Presentation by Ben Scheirman give at the september meeting of the Houston iPhone Developers Meetup (http://houstoniphone.com)

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SQLite Techniques

  • 1. SQLite Techniques Ben Scheirman @subdigital Code / Slides: github.com/subdigital/iphonedevcon- sandiego Tuesday, September 28, 2010
  • 2. SQLite is.... Single-user File-based Simple Cross Platform A subset of full ANSI SQL Tuesday, September 28, 2010
  • 3. SQLite API Pure C API Lots of strange-looking, hard to debug code Best choice is to abstract it away Tuesday, September 28, 2010
  • 4. SQLite Tools SQLite Manager Add-in for Firefox sqlite3 command line utility Tuesday, September 28, 2010
  • 5. Writable Databases Your app bundle is signed! (That means the contents can't change) Tuesday, September 28, 2010
  • 6. Your App Sandbox Your App Bundle Resources Documents Tuesday, September 28, 2010
  • 7. Your App Sandbox Your App Bundle Resources Documents Tuesday, September 28, 2010
  • 8. Creating the database Tuesday, September 28, 2010
  • 9. Getting Resource Paths Tuesday, September 28, 2010
  • 10. Getting Resource Paths //fetches  path  for  foo.db Tuesday, September 28, 2010
  • 11. Getting Resource Paths //fetches  path  for  foo.db NSString  *resourcePath  =  [[NSBundle  mainBundle] Tuesday, September 28, 2010
  • 12. Getting Resource Paths //fetches  path  for  foo.db NSString  *resourcePath  =  [[NSBundle  mainBundle]                                                          pathForResource:@"foo" Tuesday, September 28, 2010
  • 13. Getting Resource Paths //fetches  path  for  foo.db NSString  *resourcePath  =  [[NSBundle  mainBundle]                                                          pathForResource:@"foo"                                                          ofType:@"db"]; Tuesday, September 28, 2010
  • 14. Finding the Documents Directory Tuesday, September 28, 2010
  • 15. Finding the Documents Directory NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(   Tuesday, September 28, 2010
  • 16. Finding the Documents Directory NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(                                                        NSDocumentDirectory,   Tuesday, September 28, 2010
  • 17. Finding the Documents Directory NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(                                                        NSDocumentDirectory,                                                        NSUserDomainMask,   Tuesday, September 28, 2010
  • 18. Finding the Documents Directory NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(                                                        NSDocumentDirectory,                                                        NSUserDomainMask,                                                        YES); Tuesday, September 28, 2010
  • 19. Finding the Documents Directory NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(                                                        NSDocumentDirectory,                                                        NSUserDomainMask,                                                        YES); NSString  *documentsDirectory  =  [paths  objectAtIndex:0]; Tuesday, September 28, 2010
  • 20. Copy a default database on startup Tuesday, September 28, 2010
  • 21. Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
  • 22. Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
  • 23. Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
  • 24. Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
  • 25. Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
  • 26. Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
  • 27. Copy a default database on startup //in applicationDidFinishLaunching NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"db"]; NSString *targetPath = ... NSFileManager *fm = [NSFileManager defaultManager]; if(![fm fileExistsAtPath:targetPath]) { [fm copyItemAtPath:sourcePath toPath:targetPath error:&error]; } Tuesday, September 28, 2010
  • 28. SQLite API Basics Tuesday, September 28, 2010
  • 29. Add the Framework Tuesday, September 28, 2010
  • 30. Add the Framework Tuesday, September 28, 2010
  • 31. Add the Framework Tuesday, September 28, 2010
  • 32. Add the Framework Tuesday, September 28, 2010
  • 33. SQLite API - Opening a connection Tuesday, September 28, 2010
  • 34. SQLite API - Opening a connection #import "sqlite3.h" Tuesday, September 28, 2010
  • 35. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; Tuesday, September 28, 2010
  • 36. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); Tuesday, September 28, 2010
  • 37. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { Tuesday, September 28, 2010
  • 38. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { [NSException raise:@"SQLITE ERROR" Tuesday, September 28, 2010
  • 39. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { [NSException raise:@"SQLITE ERROR" format:@"Error %d", result]; Tuesday, September 28, 2010
  • 40. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { [NSException raise:@"SQLITE ERROR" format:@"Error %d", result]; } Tuesday, September 28, 2010
  • 41. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { [NSException raise:@"SQLITE ERROR" format:@"Error %d", result]; } //later Tuesday, September 28, 2010
  • 42. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) { [NSException raise:@"SQLITE ERROR" format:@"Error %d", result]; } //later sqlite3_close(db); Tuesday, September 28, 2010
  • 43. SQLite API - executing queries Tuesday, September 28, 2010
  • 44. SQLite API - executing queries int sqlite3_exec( Tuesday, September 28, 2010
  • 45. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, Tuesday, September 28, 2010
  • 46. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, Tuesday, September 28, 2010
  • 47. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, Tuesday, September 28, 2010
  • 48. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, Tuesday, September 28, 2010
  • 49. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage Tuesday, September 28, 2010
  • 50. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); Tuesday, September 28, 2010
  • 51. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); //callback signature Tuesday, September 28, 2010
  • 52. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); //callback signature int RowCallback(void * context, Tuesday, September 28, 2010
  • 53. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); //callback signature int RowCallback(void * context, int numColumns, Tuesday, September 28, 2010
  • 54. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); //callback signature int RowCallback(void * context, int numColumns, char** colValues, Tuesday, September 28, 2010
  • 55. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage ); //callback signature int RowCallback(void * context, int numColumns, char** colValues, char ** colNames); Tuesday, September 28, 2010
  • 56. SQLite API - Prepared Statements More Powerful Unfortunately much more code! Tuesday, September 28, 2010
  • 58. SQLite API-Prepared Statements sqlite3 *db; Tuesday, September 28, 2010
  • 59. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); Tuesday, September 28, 2010
  • 60. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { Tuesday, September 28, 2010
  • 61. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error Tuesday, September 28, 2010
  • 62. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } Tuesday, September 28, 2010
  • 63. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } Tuesday, September 28, 2010
  • 64. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; Tuesday, September 28, 2010
  • 65. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); Tuesday, September 28, 2010
  • 66. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { Tuesday, September 28, 2010
  • 67. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error Tuesday, September 28, 2010
  • 68. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error } Tuesday, September 28, 2010
  • 69. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error } //... Tuesday, September 28, 2010
  • 70. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error } //... Tuesday, September 28, 2010
  • 71. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error } //... Tuesday, September 28, 2010
  • 72. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt; result = sqlite3_prepare_v2(db, sql_cstring, -1, &stmt, NULL); if(result != SQLITE_OK) { //handle error } //... Tuesday, September 28, 2010
  • 74. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) Tuesday, September 28, 2010
  • 75. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! Tuesday, September 28, 2010
  • 76. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); Tuesday, September 28, 2010
  • 77. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); Tuesday, September 28, 2010
  • 78. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); Tuesday, September 28, 2010
  • 79. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); Tuesday, September 28, 2010
  • 80. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) Tuesday, September 28, 2010
  • 81. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! Tuesday, September 28, 2010
  • 82. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! Tuesday, September 28, 2010
  • 83. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; Tuesday, September 28, 2010
  • 84. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { Tuesday, September 28, 2010
  • 85. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; Tuesday, September 28, 2010
  • 86. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; Tuesday, September 28, 2010
  • 87. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; Tuesday, September 28, 2010
  • 88. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; Tuesday, September 28, 2010
  • 89. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; result = sqlite3_step(stmt); Tuesday, September 28, 2010
  • 90. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; result = sqlite3_step(stmt); } Tuesday, September 28, 2010
  • 91. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; result = sqlite3_step(stmt); } sqlite_finalize(stmt); Tuesday, September 28, 2010
  • 92. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; result = sqlite3_step(stmt); } sqlite_finalize(stmt); Tuesday, September 28, 2010
  • 93. SQLite API-Prepared Statements //INSERT INTO CARS(year, make) VALUES(?, ?) //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT); result = sqlite3_step(stmt); if(result == SQLITE_DONE) return [NSArray array]; //nothing to do! NSMutableArray *results = [NSMutableArray array]; while(result == SQLITE_ROW) { NSMutableDictionary *row = [NSMutableDictionary dictionary]; [self processRow:row forStatement:stmt]; [results addObject:row]; result = sqlite3_step(stmt); } sqlite_finalize(stmt); return results; Tuesday, September 28, 2010
  • 95. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { Tuesday, September 28, 2010
  • 96. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); Tuesday, September 28, 2010
  • 97. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { Tuesday, September 28, 2010
  • 98. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! Tuesday, September 28, 2010
  • 99. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); Tuesday, September 28, 2010
  • 100. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); Tuesday, September 28, 2010
  • 101. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; Tuesday, September 28, 2010
  • 102. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { Tuesday, September 28, 2010
  • 103. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; Tuesday, September 28, 2010
  • 104. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { Tuesday, September 28, 2010
  • 105. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); Tuesday, September 28, 2010
  • 106. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; Tuesday, September 28, 2010
  • 107. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { Tuesday, September 28, 2010
  • 108. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling Tuesday, September 28, 2010
  • 109. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling } Tuesday, September 28, 2010
  • 110. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling } [row setObject:value forKey: Tuesday, September 28, 2010
  • 111. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling } [row setObject:value forKey: [NSString stringWithUTF8String:colName]]; Tuesday, September 28, 2010
  • 112. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling } [row setObject:value forKey: [NSString stringWithUTF8String:colName]]; } Tuesday, September 28, 2010
  • 113. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement: (sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt); for(int i=0; i<columnCount; i++) { //0-based index! const char * colName = sqlite3_column_name(stmt, i); int type = sqlite3_column_type(stmt, i); id value = [NSNull null]; if(type == SQLITE_INTEGER) { value = [NSNumber numberWithInt:sqlite3_column_int(stmt, i)]; } else if (type == SQLITE_TEXT) { const unsigned char * text = sqlite3_column_text(stmt, i); value = [NSString stringWithFormat:@"%s", text]; } else { // more type handling } [row setObject:value forKey: [NSString stringWithUTF8String:colName]]; } } Tuesday, September 28, 2010
  • 114. FMDB http://github.com/ccgus/fmdb Tuesday, September 28, 2010
  • 116. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"]; Tuesday, September 28, 2010
  • 117. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open]) Tuesday, September 28, 2010
  • 118. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db."); Tuesday, September 28, 2010
  • 119. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"]; Tuesday, September 28, 2010
  • 120. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];      Tuesday, September 28, 2010
  • 121. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError]) Tuesday, September 28, 2010
  • 122. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], Tuesday, September 28, 2010
  • 123. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]); Tuesday, September 28, 2010
  • 124. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"]; Tuesday, September 28, 2010
  • 125. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction]; Tuesday, September 28, 2010
  • 126. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0; Tuesday, September 28, 2010
  • 127. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) { Tuesday, September 28, 2010
  • 128. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) {   [db executeUpdate:@"insert into test (a, b) values (?, ?)" , Tuesday, September 28, 2010
  • 129. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) {   [db executeUpdate:@"insert into test (a, b) values (?, ?)" ,        @"hi'", // look! I put in a ', and I'm not escaping it! Tuesday, September 28, 2010
  • 130. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) {   [db executeUpdate:@"insert into test (a, b) values (?, ?)" ,        @"hi'", // look! I put in a ', and I'm not escaping it!        [NSNumber numberWithInt:i]]; Tuesday, September 28, 2010
  • 131. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) {   [db executeUpdate:@"insert into test (a, b) values (?, ?)" ,        @"hi'", // look! I put in a ', and I'm not escaping it!        [NSNumber numberWithInt:i]];   } Tuesday, September 28, 2010
  • 132. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];        if ([db hadError])    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);   [db executeUpdate:@"create table test (a text, b integer)"];   [db beginTransaction];   int i = 0;   while (i++ < 20) {   [db executeUpdate:@"insert into test (a, b) values (?, ?)" ,        @"hi'", // look! I put in a ', and I'm not escaping it!        [NSNumber numberWithInt:i]];   }   [db commit]; Tuesday, September 28, 2010
  • 133. What about updates? Database is never copied over again If we did, your customers would lose data Tuesday, September 28, 2010
  • 134. Migrations Concept from Ruby on Rails Evolutionary database design Each database has a "version" App runs all migrations to the latest version Tuesday, September 28, 2010
  • 135. Migrations number name 1 initial_schema 2 update_foo 3 implement_blah Tuesday, September 28, 2010
  • 136. Migrations number name 1 initial_schema 2 update_foo 3 implement_blah Tuesday, September 28, 2010
  • 137. Hand-rolled Database Migrator DEMO Tuesday, September 28, 2010
  • 138. FMDB Migration Manager http://github.com/mocra/fmdb- migration-manager Tuesday, September 28, 2010
  • 139. FMDB Migration Manager NSArray *migrations = [NSArray arrayWithObjects: [CreateStudents migration], // 1 [CreateStaffMembers migration], // 2 [AddStudentNumberToStudents migration], // 3 nil ]; [FmdbMigrationManager executeForDatabasePath:@"/tmp/tmp.db" withMigrations:migrations]; Tuesday, September 28, 2010
  • 140. FMDB Migration Manager @interface CreateStudents : FmdbMigration { } @end @implementation CreateStudents - (void)up { [self createTable:@"students" withColumns:[NSArray arrayWithObjects: [FmdbMigrationColumn columnWithColumnName:@"first_name" columnType:@"string"], [FmdbMigrationColumn columnWithColumnName:@"age" columnType:@"integer" defaultValue:21], nil]; } - (void)down { [self dropTable:@"students"]; } @end Tuesday, September 28, 2010
  • 141. ActiveRecord Person *p = [[Person alloc] init]; p.name = @"Joe"; p.occupation = @"Dishwasher"; [p save]; Person *p = [Person personWithId:5]; ==> Person {id:5, name:Joe, occupation:Dishwasher} Tuesday, September 28, 2010
  • 142. Aptiva's ActiveRecord http://github.com/aptiva/activerecord (YMMV) Tuesday, September 28, 2010