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/***************************************************************************
my_tran.c - description
-------------------
begin : Wed Aug 8 2001
copyright : (C) MySQL AB 1995-2002, www.mysql.com
author : venu ( venu@mysql.com )
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
/***************************************************************************
* *
* This is a basic sample to demonstrate the transaction support in *
* MySQL using MySQL ODBC 3.51 driver *
* *
***************************************************************************/
#include "my_utility.h" /* MyODBC 3.51 sample utility header */
/********************************************************
* Transactional behaviour using BDB/InnoDB table type *
*********************************************************/
void my_transaction(SQLHDBC hdbc, SQLHSTMT hstmt)
{
SQLRETURN rc;
printf("\nmy_transaction:\n");
/* set AUTOCOMMIT to OFF */
rc = SQLSetConnectAttr(hdbc,SQL_ATTR_AUTOCOMMIT,(SQLPOINTER)SQL_AUTOCOMMIT_OFF,0);
mycon(hdbc,rc);
rc = SQLExecDirect(hstmt,"DROP TABLE IF EXISTS my_demo_transaction",SQL_NTS);
mystmt(hstmt,rc);
rc = SQLTransact(NULL,hdbc,SQL_COMMIT);
mycon(hdbc,rc);
/* create the table 'mytran_demo' of type BDB' or 'InnoDB' */
rc = SQLExecDirect(hstmt,"CREATE TABLE my_demo_transaction(col1 int ,col2 varchar(30)) TYPE = BDB",SQL_NTS);
mystmt(hstmt,rc);
rc = SQLTransact(NULL,hdbc,SQL_COMMIT);
mycon(hdbc,rc);
/* insert a row and commit the transaction */
rc = SQLExecDirect(hstmt,"INSERT INTO my_demo_transaction VALUES(10,'venu')",SQL_NTS);
mystmt(hstmt,rc);
rc = SQLTransact(NULL,hdbc,SQL_COMMIT);
mycon(hdbc,rc);
/* now insert the second row, and rollback the transaction */
rc = SQLExecDirect(hstmt,"INSERT INTO my_demo_transaction VALUES(20,'mysql')",SQL_NTS);
mystmt(hstmt,rc);
rc = SQLTransact(NULL,hdbc,SQL_ROLLBACK);
mycon(hdbc,rc);
/* delete first row, and rollback it */
rc = SQLExecDirect(hstmt,"DELETE FROM my_demo_transaction WHERE col1 = 10",SQL_NTS);
mystmt(hstmt,rc);
rc = SQLTransact(NULL,hdbc,SQL_ROLLBACK);
mycon(hdbc,rc);
rc = SQLFreeStmt(hstmt,SQL_CLOSE);
mystmt(hstmt,rc);
/* test the results now, only one row should exists */
rc = SQLExecDirect(hstmt,"SELECT * FROM my_demo_transaction",SQL_NTS);
mystmt(hstmt,rc);
rc = SQLFetch(hstmt);
mystmt(hstmt,rc);
rc = SQLFetch(hstmt);
mystmt_err(hstmt,rc == SQL_NO_DATA_FOUND,rc);
rc = SQLFreeStmt(hstmt,SQL_CLOSE);
mystmt(hstmt,rc);
printf(" success!!\n");
}
/********************************************************
* main routine *
*********************************************************/
int main(int argc, char *argv[])
{
SQLHENV henv;
SQLHDBC hdbc;
SQLHSTMT hstmt;
SQLINTEGER narg;
/*
* show the usage string when the user asks for this
*/
printf("***********************************************\n");
printf("usage: my_tran [DSN] [UID] [PWD] \n");
printf("***********************************************\n");
/*
* if connection string supplied through arguments, overrite
* the default one..
*/
for(narg = 1; narg < argc; narg++)
{
if ( narg == 1 )
mydsn = argv[1];
else if ( narg == 2 )
myuid = argv[2];
else if ( narg == 3 )
mypwd = argv[3];
}
/*
* connect to MySQL server
*/
myconnect(&henv,&hdbc,&hstmt);
/*
* simple transaction test
*/
my_transaction(hdbc, hstmt);
/*
* disconnect from the server, by freeing all resources
*/
mydisconnect(&henv,&hdbc,&hstmt);
return(0);
}
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