php+mysql事务rollback&commit示例
mysql_query("BEGIN");//开始一个事务
mysql_query("SET AUTOCOMMIT=0"); //设置事务不自动commit
$insert="INSERT INTO userinfo VALUES ('aa12','aa','1','aaa')";
mysql_query($insert);
mysql_query("COMMIT");//非autocommit模式,必须手动执行COMMIT使操作生效
//mysql_query("SET AUTOCOMMIT=0");
$insert="INSERT INTO userinfo VALUES ('aa20','aa','1','aaa')";
$insert="INSERT INTO userinfo VALUES ('aa8','aa','1')";
//mysql_query("COMMIT");
if(mysql_num_rows==0)
mysql_query("ROLLBACK");//非autocommit模式,执行ROLLBACK使事务操作无效
else echo "ok";
//mysql_query("CLOSE");
mysql_query("SET AUTOCOMMIT=1");//恢复autocommit模式
$insert="INSERT INTO userinfo VALUES ('aa15','aa','1','aaa')";
mysql_query($insert);//不需要手动执行COMMIT就可以使事务操作生效
执行BEGIN之后,其作用同set autocommit=0,而且之后设置set autocommit=0或1时无效。所以,为使操作清楚,一般不使用BEGIN。

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