The document describes various functions for connecting to and interacting with databases using ODBC and MySQL in Ring. It provides syntax and examples for functions to connect and disconnect from databases, execute queries, fetch and retrieve result sets, insert and retrieve data, and handle transactions. Sections cover functions for ODBC like odbc_connect(), odbc_execute(), odbc_fetch(), and for MySQL like mysql_init(), mysql_connect(), mysql_query(), mysql_insert_id(). The document aims to demonstrate how to perform common database operations in Ring such as executing queries, committing transactions, and saving/retrieving images from a database.

1. Ring Documentation, Release 1.5.3
35.7 odbc_connect() Function
We can connect to the database using the odbc_connect() function.
Syntax:
odbc_connect(ODBC Handle, cConnectionString)
35.8 odbc_disconnect() Function
We can close the connection to the database using the odbc_disconnect() function.
Syntax:
odbc_disconnect(ODBC Handle)
35.9 Open and Close Connection
The next example connect to the database then close the connection
See "ODBC test 3" + nl
pODBC = odbc_init()
See "Connect to database" + nl
see odbc_connect(pODBC,"DBQ=test.mdb;Driver={Microsoft Access Driver (*.mdb)}") + nl
See "disconnect" + nl
odbc_disconnect(pODBC)
See "Close database..." + nl
odbc_close(pODBC)
Output:
ODBC test 3
Connect to database
1
disconnect
Close database...
35.10 odbc_execute() Function
We can execute SQL Statements on the database using the odbc_execute() function.
Syntax:
odbc_execute(ODBC Handle, cSQLStatement)
35.11 odbc_colcount() Function
We can get columns count in the query result using the odbc_colcount() function.
Syntax:
35.7. odbc_connect() Function 245

2. Ring Documentation, Release 1.5.3
odbc_colcount(ODBC Handle) ---> Columns Count as Number
35.12 odbc_fetch() Function
We can fetch a row from the query result using the odbc_fetch() function.
Syntax:
odbc_fetch(ODBC Handle)
35.13 odbc_getdata() Function
We can get column value from the fetched row using the odbc_getdata() function.
Syntax:
odbc_getdata(ODBC Handle, nColumnNumber) ---> Column Value
35.14 Execute Query and Print Result
The next example execute query then print the query result.
See "ODBC test 4" + nl
pODBC = odbc_init()
See "Connect to database" + nl
see odbc_connect(pODBC,"DBQ=test.mdb;Driver={Microsoft Access Driver (*.mdb)}") + nl
See "Select data" + nl
see odbc_execute(pODBC,"select * from person") + nl
nMax = odbc_colcount(pODBC)
See "Columns Count : " + nMax + nl
while odbc_fetch(pODBC)
See "Row data:" + nl
for x = 1 to nMax
see odbc_getdata(pODBC,x) + " - "
next
end
See "Close database..." + nl
odbc_disconnect(pODBC)
odbc_close(pODBC)
35.15 odbc_tables() Function
We can get a list of tables inside the database using the odbc_tables() function.
We can access the result of this function as we get any query result.
Syntax:
odbc_tables(ODBC Handle)
Example:
35.12. odbc_fetch() Function 246

3. Ring Documentation, Release 1.5.3
See "ODBC test - Get Database Tables" + nl
pODBC = odbc_init()
See "Connect to database" + nl
odbc_connect(pODBC,"DBQ=test.mdb;Driver={Microsoft Access Driver (*.mdb)}") + nl
See "Select data" + nl
odbc_tables(pODBC) + nl
nMax = odbc_colcount(pODBC)
See "Columns Count : " + nMax + nl
while odbc_fetch(pODBC)
for x = 1 to nMax
see odbc_getdata(pODBC,x)
if x != nMax see " - " ok
next
See nl
end
See "Close database..."
odbc_disconnect(pODBC)
odbc_close(pODBC)
Output:
ODBC test - Get Database Tables
Connect to database
Select data
Columns Count : 5
.test - NULL - Customer - TABLE - NULL
.test - NULL - employee - TABLE - NULL
.test - NULL - person - TABLE - NULL
.test - NULL - tel - TABLE - NULL
Close database...
35.16 odbc_columns() Function
We can get a list of columns inside the table using the odbc_columns() function.
Syntax:
odbc_columns(ODBC Handle, cTableName)
Example:
See "ODBC test - Get Table Columns" + nl
pODBC = odbc_init()
See "Connect to database" + nl
odbc_connect(pODBC,"DBQ=test.mdb;Driver={Microsoft Access Driver (*.mdb)}") + nl
See "Get Columns inside the Person Table" + nl
odbc_columns(pODBC,"person") + nl
while odbc_fetch(pODBC)
see odbc_getdata(pODBC,4) + nl
end
See "Close database..." + nl
odbc_disconnect(pODBC)
odbc_close(pODBC)
Output:
35.16. odbc_columns() Function 247

4. Ring Documentation, Release 1.5.3
ODBC test - Get Table Columns
Connect to database
Get Columns inside the Person Table
FIRST
LAST
STREET
CITY
STATE
ZIP
HIREDATE
MARRIED
AGE
SALARY
NOTES
Close database...
35.17 odbc_autocommit() Function
We can enable or disable the auto commit feature using the odbc_autocommit() function.
Syntax:
odbc_autocommit(ODBC Handle, lStatus) # lStatus can be True or False
35.18 odbc_commit() Function
We can commit updates to the database using the odbc_commit() function.
Syntax:
odbc_commit(ODBC Handle)
35.19 odbc_rollback() Function
We can rollback updates to the database using the odbc_rollback() function.
Syntax:
odbc_rollback(ODBC Handle)
35.20 Transactions and Using Commit and Rollback
Example:
See "ODBC Test - Transactions and using Commit and Rollback" + nl
pODBC = odbc_init()
See "Connect to database" + nl
see odbc_connect(pODBC,"DBQ=test.mdb;Driver={Microsoft Access Driver (*.mdb)}") + nl
see "insert data..." + nl
odbc_autocommit(pODBC,0)
35.17. odbc_autocommit() Function 248

5. Ring Documentation, Release 1.5.3
for x = 1 to 10000
odbc_execute(pODBC,"insert into tel values (" + x + ",'mahmoud')")
next
for x = 10001 to 15000
odbc_execute(pODBC,"insert into tel values (" + x + ",'samir')")
next
odbc_commit(pODBC)
for x = 15001 to 20000
odbc_execute(pODBC,"insert into tel values (" + x + ",'fayed')")
next
ODBC_ROLLBACK(pODBC)
odbc_execute(pODBC,"insert into tel values (" + x + ",'fayed')")
odbc_commit(pODBC)
See "Close database..." + nl
odbc_disconnect(pODBC)
odbc_close(pODBC)
Output:
ODBC Test - Transactions and using Commit and Rollback
Connect to database
1
insert data...
Close database...
35.21 Save and Restore images
The next example save an image inside the database
See "ODBC test - Save image in the database" + nl
pODBC = odbc_init()
See "Connect to database" + nl
see odbc_connect(pODBC,"DBQ=test.mdb;Driver={Microsoft Access Driver (*.mdb)}") + nl
see "Read Image File..." + nl
cFile = str2hex(read("testsmahmoud.jpg"))
see "size " + len(CFile)+nl
see "Save image in the database..." + nl
stmt = "insert into tel values (20000,'mahmoud','" + cFile + "');"
odbc_execute(pODBC,stmt)
See "Close database..." + nl
odbc_disconnect(pODBC)
odbc_close(pODBC)
The next example restore the image from the database
See "ODBC Test - Restore image from the database" + nl
pODBC = odbc_init()
See "Connect to database" + nl
see odbc_connect(pODBC,"DBQ=test.mdb;Driver={Microsoft Access Driver (*.mdb)}") + nl
See "Select data" + nl
see odbc_execute(pODBC,"select * from tel where id = 20000") + nl
nMax = odbc_colcount(pODBC)
See "Columns Count : " + nMax + nl
if odbc_fetch(pODBC)
35.21. Save and Restore images 249

6. Ring Documentation, Release 1.5.3
See "Write image file" + nl
write("testsgreat.jpg",hex2str( odbc_getdata(pODBC,3) ) )
ok
See "Close database..." + nl
odbc_disconnect(pODBC)
odbc_close(pODBC)
35.21. Save and Restore images 250

7. CHAPTER
THIRTYSIX
MYSQL FUNCTIONS
In this chapter we are going to learn about the MySQL functions provided by the Ring programming language.
• MySQL_Info()
• MySQL_Init()
• MySQL_Error()
• MySQL_Connect()
• MySQL_Close()
• MySQL_Query()
• MySQL_Insert_ID()
• MySQL_Result()
• MySQL_Next_Result()
• MySQL_Columns()
• MySQL_Result2()
• MySQL_Escape_String()
• MySQL_AutoCommit()
• MySQL_Commit()
• MySQL_Rollback()
Before using the next function load the mysqllib.ring library
load "mysqllib.ring"
# Use MySQL functions
36.1 MySQL_Info() Function
We can get the MySQL Client version using the MySQL_Info() function.
Syntax:
MySQL_Info() ---> string contains the MySQL Client version
Example:
see "MySQL Client Version : " + mysql_info()
251

8. Ring Documentation, Release 1.5.3
Output:
MySQL Client Version : 6.1.5
36.2 MySQL_Init() Function
We can start using MySQL Client through the MySQL_Init() function.
Syntax:
MySQL_Init() ---> MySQL Handle
36.3 MySQL_Error() Function
We can get the error message from the MySQL Client using the MySQL_Error() function.
Syntax:
MySQL_Error(MySQL Handle) ---> Error message as string
36.4 MySQL_Connect() Function
We can connect to the MySQL database server using the MySQL_Connect() function.
Syntax:
MySQL_Connect(MySQL Handle, cServer, cUserName, cPassword) ---> lStatus
36.5 MySQL_Close() Function
We can close the connection to the MySQL database using the MySQL_Close() function
Syntax:
MySQL_Close(MySQL Handle)
36.6 MySQL_Query() Function
We can execute SQL queries using the MySQL_Query() function
Syntax:
MySQL_Query(MySQL Handle, cSQLQuery)
36.2. MySQL_Init() Function 252

9. Ring Documentation, Release 1.5.3
36.7 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
36.8 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)")
36.7. Create Database 253

10. Ring Documentation, Release 1.5.3
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
36.9 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
36.9. MySQL_Insert_ID() Function 254