我正在尝试对 Zend Framework 2 的 SQL 类使用两个左外连接,但由于某种原因,它没有返回一个结果,但另一个结果工作正常。我已经在 MySQL Workbench 中运行了实际的 SQL,它返回的结果就像我想要的那样,但它不是使用 Zend Framework 执行的。这是我的代码:
纯 SQL:
SELECT groups.group_name, members.username, groups.id FROM groups
LEFT OUTER JOIN group_admins ON groups.id = group_admins.group_id
LEFT OUTER JOIN members ON group_admins.user_id = members.id
WHERE group_admins.user_id = " . parent::getUserId()['id']
这将返回我希望的结果(可以在此处看到:http://imgur.com/8ydmn4f)
现在,这是我现有的 Zend Framework 2 代码:
$select_admins = new Select();
$select_admins->from(array(
'g' => 'groups',
))
->join(array(
'ga' => 'group_admins'
), 'g.id = ga.group_id')
->join(array(
'm' => 'members'
), 'ga.user_id = m.id', array('username'))
->where(array('ga.user_id' => parent::getUserId()['id']));
$query_group_admin = parent::$sql->getAdapter()->query(parent::$sql->buildSqlString($select_admins), Adapter::QUERY_MODE_EXECUTE);
$group_admins = array();
foreach ($query_group_admin as $group_admin) {
$group_admins[] = $group_admin;
}
// get the group members
$select = new Select();
$select->from(array(
'g' => 'group_members'
))
->join(array(
'm' => 'members'
), 'g.member_id = m.id')
->join(array(
'grp' => 'groups'
), 'g.group_id = grp.id')
->where(array(
'g.group_id' => $group_id
));
$query = parent::$sql->getAdapter()->query(parent::$sql->buildSqlString($select), Adapter::QUERY_MODE_EXECUTE);
$member_username = array();
foreach ($query as $member) {
$member_username[] = $member['username'];
}
// get the rest of the group info
$fetch = $this->gateway->select(array(
'id' => $group_id
));
$row = $fetch->current();
if (!$row) {
return false;
}
return array(
'admins' => implode(", ", $group_admins),
'members' => implode(", ", $member_username),
'info' => $row
);
Controller :
public function grouphomeAction()
{
$id = $this->params()->fromRoute('id', 0);
if (0 === $id) {
return $this->redirect()->toRoute('members/groups', array('action' => 'index'));
}
if (!$this->getGroupsService()->getGroupInformation($id)) {
return $this->redirect()->toRoute('members/groups', array('action' => 'index'));
}
return new ViewModel(array('group_info' => $this->getGroupsService()->getGroupInformation($id)));
}
但是,这仅显示群组名称、群组创建者和群组成员,而将群组管理员字段留空。
这是返回数组的 print_r 结果:
Array ( [admins] => [members] => jimmysole, fooboy [info] => ArrayObject Object ( [storage:ArrayObject:private] => Array ( [id] => 2 [group_name] => Tim's Group [group_creator] => timlinden [group_created_date] => 2017-01-16 17:39:56 ) ) )
如果有帮助,这里还有页面的屏幕截图 - http://imgur.com/xUQMaUu
如有任何帮助,我们将不胜感激!
谢谢。
最佳答案
基本上你的连接是 INNER JOINS...我知道...你现在一定讨厌 Zend :p 。默认情况下,它们是内部连接,所以我认为这是错误的。所以尝试指定连接类型,你应该没问题。您可以在这里找到更多示例:examples
$select12->from('foo')->join('zac', 'm = n', array('bar', 'baz'), Select::JOIN_OUTER);
关于mysql - Zend Framework 2 SQL 连接问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41755641/