The Ring programming language version 1.9 book - Part 36 of 210

1. Ring Documentation, Release 1.9
40.7 Create Database
The next example connect to MySQL Server then create new database.
See "MySQL Test - Create Database" + nl
con = mysql_init()
See "Connect" + nl
if mysql_connect(con,"localhost","root","root") = 0
see "Cann't connect" + nl
see "Error : " + mysql_error(con) + nl
mysql_close(con)
bye
ok
See "Create Database..." + nl
mysql_query(con,"CREATE DATABASE mahdb")
See "Close Connection" + nl
mysql_close(con)
Output:
MySQL Test - Create Database
Connect
Create Database...
Close Connection
40.8 Create Table and Insert Data
The next example create new table and insert records
func main
see "Create Table and Insert Records" + nl
con = mysql_init()
see "Connect" + nl
if mysql_connect(con, "localhost", "root", "root","mahdb") = 0
system_error(con)
ok
see "Drop table" + nl
if mysql_query(con, "DROP TABLE IF EXISTS Employee") system_error(con) ok
see "Create table" + nl
if mysql_query(con, "CREATE TABLE Employee(Id INT, Name TEXT, Salary INT)")
system_error(con) ok
see "Insert data" + nl
if mysql_query(con, "INSERT INTO Employee VALUES(1,'Mahmoud',15000)")
system_error(con) ok
if mysql_query(con, "INSERT INTO Employee VALUES(2,'Samir',16000)")
system_error(con) ok
if mysql_query(con, "INSERT INTO Employee VALUES(3,'Fayed',17000)")
40.7. Create Database 319

2. Ring Documentation, Release 1.9
system_error(con) ok
see "Close connection" + nl
mysql_close(con)
func system_error con
see mysql_error(con) mysql_close(con) bye
Output:
Create Table and Insert Records
Connect
Drop table
Create table
Insert data
Close connection
40.9 MySQL_Insert_ID() Function
We can get the inserted row id using the MySQL_Insert_ID() function
Syntax:
MySQL_Insert_ID() ---> Inserted row id as number
Example:
con = mysql_init()
see "connect to database" + nl
mysql_connect(con,"localhost","root","root","mahdb")
see "drop table" + nl
mysql_query(con, "DROP TABLE IF EXISTS Customers")
see "create table" + nl
mysql_query(con, "CREATE TABLE Customers(Id INT PRIMARY KEY AUTO_INCREMENT, Name TEXT)")
see "insert record" + nl
mysql_query(con, "INSERT INTO Customers(Name) VALUES('Mahmoud')")
see "insert record" + nl
mysql_query(con, "INSERT INTO Customers(Name) VALUES('Samir')")
see "insert record" + nl
mysql_query(con, "INSERT INTO Customers(Name) VALUES('Fayed')")
see "insert record" + nl
mysql_query(con, "INSERT INTO Customers(Name) VALUES('Test 2015')")
see "inserted row id : " + mysql_insert_id(con) + nl
see "close database" + nl
mysql_close(con)
Output:
connect to database
drop table
create table
insert record
insert record
insert record
insert record
inserted row id : 4
close database
40.9. MySQL_Insert_ID() Function 320

3. Ring Documentation, Release 1.9
40.10 MySQL_Result() Function
We can get the query result (data without column names) using the MySQL_Result() function.
Syntax:
MySQL_Result(MySQL Handle) ---> List contains the query result
40.11 MySQL_Next_Result() Function
We can move to the next query result using the MySQL_Next_Result() function. We use this function when we have
multiple SQL statements in the same query.
Syntax:
MySQL_Next_Result(MySQL Handle)
40.12 Print Query Result
The next example execute a query on the database then print the result.
con = mysql_init()
see "Connect to database" + nl
mysql_connect(con, "localhost", "root", "root","mahdb")
see "Execute Query" + nl
mysql_query(con, "SELECT Name FROM Employee WHERE Id=1;"+
"SELECT Name FROM Employee WHERE Id=3")
see "Print Result" + nl
see mysql_result(con)
mysql_next_result(con)
see mysql_result(con)
see "close database" + nl
mysql_close(con)
Output:
Connect to database
Execute Query
Print Result
Mahmoud
Fayed
close database
40.13 MySQL_Columns() Function
We can get a list of columns names using the MySQL_Columns() function.
Syntax:
40.10. MySQL_Result() Function 321

4. Ring Documentation, Release 1.9
MySQL_Columns(MySQL Handle) ---> List contains columns information
Example:
con = mysql_init()
see "Connect to database" + nl
mysql_connect(con, "localhost", "root", "root","mahdb")
see "Execute Query" + nl
mysql_query(con, "SELECT * FROM Employee")
see "Result" + nl
see mysql_columns(con)
see "Close database" + nl
mysql_close(con)
Output:
Connect to database
Execute Query
Result
Id
11
3
32768
Name
65535
252
16
Salary
11
3
32768
Close database
40.14 MySQL_Result2() Function
Instead of using MySQL_Result() to get the result data without columns names, we can use the MySQL_Result2() to
get all of the column names then the query result in one list.
Syntax:
MySQL_Result2(MySQL Handle) ---> List (query result starts with columns names)
Example:
con = mysql_init()
see "Connect to database" + nl
mysql_connect(con, "localhost", "root", "root","mahdb")
see "Execute Query" + nl
mysql_query(con, "SELECT * FROM Employee")
see "Print Result" + nl
see mysql_result2(con)
see "Close database" + nl
mysql_close(con)
Output:
40.14. MySQL_Result2() Function 322

5. Ring Documentation, Release 1.9
Connect to database
Execute Query
Print Result
Id
Name
Salary
1
Mahmoud
15000
2
Samir
16000
3
Fayed
17000
Close database
40.15 MySQL_Escape_String() Function
We can store binary data and special characters in the database after processing using MySQL_Escape_String() func-
tion
Syntax:
MySQL_Escape_String(MySQL Handle, cString) ---> String after processing
40.16 Save Image inside the database
Example:
See "Read file" + nl
cFile = read("testsmahmoud.jpg")
con = mysql_init()
See "Connect to database..." + nl
mysql_connect(con, "localhost", "root", "root","mahdb")
See "Escape string..." + nl
cFile = mysql_escape_string(con,cFile)
stmt = "INSERT INTO photo(id, data) VALUES(1, '" + cFile + "')"
See "Insert data..." + nl
mysql_query(con,stmt)
See "Close database..." + nl
mysql_close(con)
Output:
Read file
Connect to database...
Escape string...
Insert data...
Close database...
40.15. MySQL_Escape_String() Function 323

6. Ring Documentation, Release 1.9
40.17 Restore Image From The Database
Example:
con = mysql_init()
See "Connect to database..." + nl
mysql_connect(con, "localhost", "root", "root","mahdb")
See "Read data from database..." + nl
mysql_query(con,"SELECT data FROM photo WHERE id=1")
See "Write new file" + nl
result = mysql_result(con)
write("testsmahmoud2.jpg",result[1][1])
See "Close database..." + nl
mysql_close(con)
Output:
Connect to database...
Read data from database...
Write new file
Close database...
40.18 MySQL_AutoCommit() Function
We can enable or disable the auto commit feature using the MySQL_AutoCommit() function.
Syntax:
MySQL_AutoCommit(MySQL Handle, lStatus) # lstatus can be True/False
40.19 MySQL_Commit() Function
We can commit updates to the database using the MySQL_Commit() function.
Syntax:
MySQL_Commit(MySQL Handle)
40.20 MySQL_Rollback() Function
We can rollback updates to the database using the MySQL_Rollback() function.
Syntax:
MySQL_Rollback(MySQL Handle)
40.21 Transaction Example
The next example presents the usage of MySQL_Autocommit(), MySQL_Commit() & MySQL_RollBack() functions.
Example:
40.17. Restore Image From The Database 324

7. Ring Documentation, Release 1.9
func main
con = mysql_init()
see "Connect" + nl
if mysql_connect(con, "localhost", "root", "root","mahdb") = 0
system_error(con) ok
see "Drop table" + nl
if mysql_query(con, "DROP TABLE IF EXISTS Employee2")
system_error(con) ok
see "Create table" + nl
if mysql_query(con, "CREATE TABLE Employee2(Id INT, Name TEXT, Salary INT)")
system_error(con) ok
see "Insert data" + nl
if mysql_query(con, "INSERT INTO Employee2 VALUES(1,'Mahmoud',15000)")
system_error(con) ok
if mysql_query(con, "INSERT INTO Employee2 VALUES(2,'Samir',16000)")
system_error(con) ok
if mysql_query(con, "INSERT INTO Employee2 VALUES(3,'Fayed',17000)")
system_error(con) ok
mysql_autocommit(con,False)
mysql_query(con, "INSERT INTO Employee2 VALUES(4,'Ahmed',5000)")
mysql_query(con, "INSERT INTO Employee2 VALUES(5,'Ibrahim',50000)")
mysql_query(con, "INSERT INTO Employee2 VALUES(6,'Mohammed',50000)")
See "Save transaction (y/n) " give nChoice
if upper(nChoice) = "Y"
mysql_commit(con)
else
mysql_rollback(con)
ok
see "Close connection" + nl
mysql_close(con)
func system_error con
see mysql_error(con)
mysql_close(con)
bye
Output:
Connect
Drop table
Create table
Insert data
Save transaction (y/n) y
Close connection
40.21. Transaction Example 325

8. CHAPTER
FORTYONE
SQLITE FUNCTIONS
In this chapter we will learn about using the SQLite database in the Ring programming language.
Before using the next function load the sqlitelib.ring library
load "sqlitelib.ring"
# Use SQLite functions
41.1 sqlite_init() function
Syntax:
sqlite_init() ---> SQLite Object
41.2 sqlite_open() function
Syntax:
sqlite_open(SQLite Object,cFileName)
41.3 sqlite_execute() function
Syntax:
sqlite_execute(SQLite Object,cSQLStatement)
41.4 sqlite_close() function
Syntax:
sqlite_close(SQLite Object)
326

9. Ring Documentation, Release 1.9
41.5 Example
The next code create a SQLite database, add new records then display the data.
load "sqlitelib.ring"
oSQLite = sqlite_init()
sqlite_open(oSQLite,"mytest.db")
sql = "
CREATE TABLE COMPANY (
ID INT PRIMARY KEY NOT NULL,
NAME TEXT NOT NULL,
AGE INT NOT NULL,
ADDRESS CHAR(50),
SALARY REAL );
"
sqlite_execute(oSQLite,sql)
sql = "
INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)
VALUES (1, 'Mahmoud' , 29, 'Jeddah', 20000.00 ),
(2, 'Ahmed' , 27, 'Jeddah', 15000.00 ),
(3, 'Mohammed', 31, 'Egypt' , 20000.00 ),
(4, 'Ibrahim' , 24, 'Egypt ', 65000.00 );
"
sqlite_execute(oSQLite,sql)
aResult = sqlite_execute(oSQLite,"select * from COMPANY")
for x in aResult
for t in x
? t[2] + nl
next
next
? copy("*",50)
for x in aResult
? x[:name]
next
sqlite_close(oSQLite)
Output:
1
Mahmoud
29
Jeddah
20000.0
2
Ahmed
27
Jeddah
15000.0
3
Mohammed
31
Egypt
41.5. Example 327

10. Ring Documentation, Release 1.9
20000.0
4
Ibrahim
24
Egypt
65000.0
**************************************************
Mahmoud
Ahmed
Mohammed
Ibrahim
41.5. Example 328