mysql - 如何在 Joomla 1.5 中创建 SQL 事务？

Question

我已经在 J​​oomla 中成功创建了一个组件，用户可以在其中更新数据库内容。问题是我有两个查询要执行，如果第二个查询失败，第一个查询所做的更改应该被丢弃。我已经尝试过这些代码，但它并没有让我回滚：

    $db = JFactory::getDBO();

    $db->setQuery("BEGIN");
    $db->query();
    $db->setQuery($delete_script);
    $db->query();
    $db->setQuery($update_script);
    $db->query();

    if($db->getErrorMsg())
    {
        $db->setQuery("ROLLBACK");
        $db->query();
        JFactory::getApplication()->enqueueMessage(JText::_($sql_script . 'An error occurred while saving loan types. Please check formatting and try again.'), 'error');
    }
    else
    {
        $db->setQuery("COMMIT");
        $db->query();
        JFactory::getApplication()->enqueueMessage(JText::_('Loan types have been saved successfully!'), 'message');

    }

    JRequest::setVar( 'view', 'loantypes' );
    parent::display();

那么如何在 Joomla 1.5 中创建事务呢？

Answer 1

You should perform like this:

$db = JFactory::getDBO();

$db->setQuery("BEGIN");
$db->query();

$db->setQuery($delete_script);
$db->query();
if($db->getErrorMsg()) {
    $db->setQuery("ROLLBACK");
    $db->query();
    JFactory::getApplication()->enqueueMessage(JText::_($sql_script . 'An error occurred while saving loan types. Please check formatting and try again.'), 'error');
}
$db->setQuery($update_script);
$db->query();

if(!$db->getErrorMsg()) {
    $db->setQuery("COMMIT");
    $db->query();
    JFactory::getApplication()->enqueueMessage(JText::_('Loan types have been saved successfully!'), 'message');

}

JRequest::setVar( 'view', 'loantypes' );
parent::display();

Rollback must be performed on recent executed query.