无论来自交易的所有查询是否都未成功执行,我的查询都会正常运行。
$this->mysqli->autocommit(FALSE);
$query = $this->mysqli->real_escape_string("INSERT INTO `product` (`name`, `price`) VALUES (?,?)");
$prod = $this->mysqli->prepare($query);
$prod->bind_param("ss", $name,$price);
$prod->execute();
$query = $this->mysqli->real_escape_string("INSERT INTO `member` (`user`, `address`) VALUES (?,?)");
$prod = $this->mysqli->prepare($query);
$prod->bind_param("ss", $user,$address);
$prod->execute();
$query = $this->mysqli->real_escape_string(" SOME BAD WRITTEN QUERY") ;
$prod = $this->mysqli->prepare($query);
$prod->execute();
if (!$this->mysqli->commit())
{
print("\nTransaction commit failed\n");
$this->mysqli->rollback();
}
$this->mysqli->autocommit(TRUE);
此代码正在运行并插入前两个查询,当然在第三个查询中断。
但是事务不起作用,无论它将插入每个有效的查询,我只想在所有三个查询都正确完成时插入。
我使用INNODB引擎和PHP 5.5
答案 0 :(得分:4)
自从autocommit
被禁用后隐式启动事务时,MySQL 不在内部跟踪您执行的语句的成功状态。那是作为程序员的你的工作。因此,即使SOME BAD WRITTEN QUERY
失败,前两个也会成功并且可以提交。
您必须相应地测试每个commit()
或rollback()
的成功与否:
注意:您应该不在SQL语句上调用real_escape_string()
。它可能有害,对于准备好的语句字符串来说绝对不是必需的。
$this->mysqli->autocommit(FALSE);
$query = "INSERT INTO `product` (`name`, `price`) VALUES (?,?)";
$prod = $this->mysqli->prepare($query);
$prod->bind_param("ss", $name,$price);
// Store success/fail in a variable (returns TRUE on success)
$success1 = $prod->execute();
$query = "INSERT INTO `member` (`user`, `address`) VALUES (?,?)";
$prod = $this->mysqli->prepare($query);
$prod->bind_param("ss", $user,$address);
// Store success/fail in a variable (returns TRUE on success)
$success2 = $prod->execute();
$query = " SOME BAD WRITTEN QUERY";
$prod = $this->mysqli->prepare($query);
// Store success/fail in a variable (returns FALSE on failure)
$success3 = $prod->execute();
// Now check if all 3 succeeded and commit() if they did
if ($success1 && $success2 && $success3)
{
$this->mysqli->commit();
}
// Or rollback() if they didn't
else
{
print("\nTransaction commit failed\n");
$this->mysqli->rollback();
}
$this->mysqli->autocommit(TRUE);
最后一点。如果您仅针对单个事务禁用autocommit
,然后重新启用它,请考虑仅启用autocommit
启用并明确开始和结束事务。只需致电
$this->mysqli->autocommit(false)
及以后$this->mysqli->autocommit(true);
// Don't disable autocommit
// Start it...
$this->mysqli->begin_transaction();
// Do your 3 queries as above and test for success
// Then commit or rollback
$this->mysqli->commit();
// (or rollback)
// Now, no need to re-enable auto-commit
如果您的应用程序将使用大量事务,那么请务必禁用autocommit
。在每次操作后,您都需要明确commit()
,但我不会在一次交易后重新启用它。
关于DDL语句的注释 - MySQL无法回滚DDL语句,我相信调用一个中间事务将导致所有先前的语句被提交,即使您尚未明确调用commit()
。如果您从代码中发出CREATE,ALTER,DROP
语句,请注意这一点。它们不能用于交易。
答案 1 :(得分:0)
正如@ gloomy.penguin所说,在发送第一笔交易之前需要mysqli->begin_transaction()
,然后在最后发送mysqli->commit()
。
禁用自动提交然后启用自动提交是不必要的,除非您有更多的代码稍后提交。