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SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
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SQLite Techniques
SQLite Techniques
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SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
SQLite Techniques
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SQLite Techniques
SQLite Techniques
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SQLite Techniques
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SQLite Techniques

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Presentation given at the Houston iPhone Developers Meetup on the september mee

Presentation given at the Houston iPhone Developers Meetup on the september mee

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  • Transcript

    • 1. SQLite Techniques
    • 2. SQLite is.... Single-user File-based Simple Cross Platform A subset of full ANSI SQL
    • 3. SQLite API Pure C API Lots of strange-looking, hard to debug code Best choice is to abstract it away
    • 4. SQLite Tools SQLite Manager Add-in for Firefox sqlite3 command line utility
    • 5. Writable Databases Your app bundle is signed! (That means the contents can't change)
    • 6. Your App Sandbox Your App Bundle Resources Documents
    • 7. Your App Sandbox Your App Bundle Resources Documents
    • 8. Creating the database
    • 9. Getting Resource Paths
    • 10. Getting Resource Paths //fetches
path
for
foo.db
    • 11. Getting Resource Paths //fetches
path
for
foo.db NSString
*resourcePath
=
[[NSBundle
mainBundle]
    • 12. Getting Resource Paths //fetches
path
for
foo.db NSString
*resourcePath
=
[[NSBundle
mainBundle] 




























pathForResource:@"foo"
    • 13. Getting Resource Paths //fetches
path
for
foo.db NSString
*resourcePath
=
[[NSBundle
mainBundle] 




























pathForResource:@"foo" 




























ofType:@"db"];
    • 14. Finding the Documents Directory
    • 15. Finding the Documents Directory NSArray
*paths
=
NSSearchPathForDirectoriesInDomains(

    • 16. Finding the Documents Directory NSArray
*paths
=
NSSearchPathForDirectoriesInDomains(
 


























NSDocumentDirectory,

    • 17. Finding the Documents Directory NSArray
*paths
=
NSSearchPathForDirectoriesInDomains(
 


























NSDocumentDirectory,
 


























NSUserDomainMask,

    • 18. Finding the Documents Directory NSArray
*paths
=
NSSearchPathForDirectoriesInDomains(
 


























NSDocumentDirectory,
 


























NSUserDomainMask,
 


























YES);
    • 19. Finding the Documents Directory NSArray
*paths
=
NSSearchPathForDirectoriesInDomains(
 


























NSDocumentDirectory,
 


























NSUserDomainMask,
 


























YES); NSString
*documentsDirectory
=
[paths
objectAtIndex:0];
    • 20. Copy a default database on startup
    • 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]; }
    • 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]; }
    • 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]; }
    • 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]; }
    • 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]; }
    • 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]; }
    • 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]; }
    • 28. SQLite API Basics
    • 29. Add the Framework
    • 30. Add the Framework
    • 31. Add the Framework
    • 32. Add the Framework
    • 33. SQLite API - Opening a connection
    • 34. SQLite API - Opening a connection #import "sqlite3.h"
    • 35. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db;
    • 36. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db);
    • 37. SQLite API - Opening a connection #import "sqlite3.h" sqlite3 *db; int result = sqlite3_open(PATH, &db); if (result != SQLITE_OK) {
    • 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"
    • 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];
    • 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]; }
    • 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
    • 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);
    • 43. SQLite API - executing queries
    • 44. SQLite API - executing queries int sqlite3_exec(
    • 45. SQLite API - executing queries int sqlite3_exec( sqlite3 *db,
    • 46. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql,
    • 47. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc,
    • 48. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context,
    • 49. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage
    • 50. SQLite API - executing queries int sqlite3_exec( sqlite3 *db, char *sql, int (*callback)(void *, int, char**, char**) callbackFunc, void *context, char **errorMessage );
    • 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
    • 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,
    • 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,
    • 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,
    • 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);
    • 56. SQLite API - Prepared Statements More Powerful Unfortunately much more code!
    • 57. SQLite API-Prepared Statements
    • 58. SQLite API-Prepared Statements sqlite3 *db;
    • 59. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db);
    • 60. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) {
    • 61. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error
    • 62. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error }
    • 63. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error }
    • 64. SQLite API-Prepared Statements sqlite3 *db; int result = sqlite3_open(DB_PATH, &db); if(result != SQLITE_OK) { //handle error } sqlite3_stmt *stmt;
    • 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);
    • 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) {
    • 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
    • 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 }
    • 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 } //...
    • 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 } //...
    • 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 } //...
    • 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 } //...
    • 73. SQLite API-Prepared Statements
    • 74. SQLite API-Prepared Statements //...
    • 75. SQLite API-Prepared Statements //... //PARAMETERS HAVE A 1-BASED INDEX!
    • 76. SQLite API-Prepared Statements //... //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5);
    • 77. SQLite API-Prepared Statements //... //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT);
    • 78. SQLite API-Prepared Statements //... //PARAMETERS HAVE A 1-BASED INDEX! sqlite3_bind_int(stmt, 1 /* idx */, 5); sqlite3_bind_text(stmt, 2 /* idx */,"value", -1, SQLITE_TRANSIENT);
    • 79. SQLite API-Prepared Statements //... //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);
    • 80. SQLite API-Prepared Statements //... //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)
    • 81. SQLite API-Prepared Statements //... //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!
    • 82. SQLite API-Prepared Statements //... //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!
    • 83. SQLite API-Prepared Statements //... //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];
    • 84. SQLite API-Prepared Statements //... //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) {
    • 85. SQLite API-Prepared Statements //... //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];
    • 86. SQLite API-Prepared Statements //... //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];
    • 87. SQLite API-Prepared Statements //... //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];
    • 88. SQLite API-Prepared Statements //... //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];
    • 89. SQLite API-Prepared Statements //... //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);
    • 90. SQLite API-Prepared Statements //... //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); }
    • 91. SQLite API-Prepared Statements //... //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);
    • 92. SQLite API-Prepared Statements //... //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);
    • 93. SQLite API-Prepared Statements //... //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;
    • 94. SQLite API-Prepared Statements
    • 95. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement:(sqlite3_stmt*)stmt {
    • 96. SQLite API-Prepared Statements -(void)processRow:(NSMutableDictionary *)row forStatement:(sqlite3_stmt*)stmt { int columnCount = sqlite3_column_count(stmt);
    • 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++) {
    • 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!
    • 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);
    • 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);
    • 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];
    • 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) {
    • 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)];
    • 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) {
    • 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);
    • 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];
    • 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 {
    • 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
    • 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 }
    • 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:
    • 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]];
    • 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]]; }
    • 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]]; } }
    • 114. FMDB http://github.com/ccgus/fmdb
    • 115. FMDB Usage
    • 116. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];
    • 117. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])
    • 118. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");
    • 119. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];
    • 120. FMDB Usage   FMDatabase* db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];   if (![db open])      NSLog(@"Could not open db.");   [db executeUpdate:@"blah blah blah"];     
    • 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])
    • 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],
    • 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]);
    • 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)"];
    • 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];
    • 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;
    • 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) {
    • 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 (?, ?)" ,
    • 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!
    • 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]];
    • 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]];   }
    • 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];
    • 133. What about updates? Database is never copied over again If we did, your customers would lose data
    • 134. Migrations Concept from Ruby on Rails Evolutionary database design Each database has a "version" App runs all migrations to the latest version
    • 135. Migrations number name 1 initial_schema 2 update_foo 3 implement_blah
    • 136. Migrations number name 1 initial_schema 2 update_foo 3 implement_blah
    • 137. Hand-rolled Database Migrator DEMO
    • 138. FMDB Migration Manager http://github.com/mocra/fmdb- migration-manager
    • 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];
    • 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
    • 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}
    • 142. Aptiva's ActiveRecord http://github.com/aptiva/activerecord (YMMV)
    • 143. Questions?

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