ZEND 2. 联合。向 UNION 查询添加限制

Question

我有一个如下所示的 sql 查询，我想在 Zend Framework 2 中创建它。

(SELECT id AS id FROM exp_personal_data ORDER BY town) UNION (SELECT id AS id FROM pd_unregister)

我想要联合并添加到这个 LIMIT、ORDER BY 等。

$this->_select->combine($selectPdContest, 'union all');

当我这样写查询时。

$this->_select->combine($selectPdContest, 'union all')->limit('10);

查询如下所示：

(SELECT id AS id FROM exp_personal_data ORDER BY Town LIMIT 10) UNION (SELECT id AS id FROM pd_unregister)

限制仅添加到第一个选择。我希望像这样添加限制。

(SELECT id AS id FROM exp_personal_data ORDER BY town ) UNION (SELECT id AS id FROM pd_unregister ) LIMIT 10

如何在 Zend 框架 2 中实现这一点？

Answer 1

解决方案 1（简单）：

    $adapter = $this->tableGateway->getAdapter();
    $resultSet = $adapter->query("(SELECT user_id AS id FROM user ORDER BY id)  UNION  (SELECT account_id AS id FROM account) LIMIT 10",$adapter::QUERY_MODE_EXECUTE);
    print_r($resultSet->toArray());die;

解决方案 2（复杂）：

use Zend\Db\Sql\Sql;
use Zend\Db\Sql\Select;

//sql query first part
$adapter = $this->tableGateway->getAdapter();//the db connection adapter
$select = new Select('user');
$select->columns(array('id' => 'user_id'));
$select->order('id');
$sql = new Sql($adapter);
$statement = $sql->getSqlStringForSqlObject($select);

//sql query second part         
$select2 = new Select('account');
$select2->columns(array('id' => 'account_id'));
$sql = new Sql($adapter);
$statement2 = $sql->getSqlStringForSqlObject($select2);

//combine the two statements into one        
$unionQuery = sprintf('%s UNION %s','('.$statement = $sql->getSqlStringForSqlObject($select).')',
'('.$statement2 = $sql->getSqlStringForSqlObject($select2).') LIMIT 10'); 

//execute the union query 
$resultSet = $adapter->query( $unionQuery, $adapter::QUERY_MODE_EXECUTE);

print_r($resultSet->toArray());die;

Answer 2

添加这些行会起作用，

$select1 = 新选择(); $select1->combine($selectPdContest, 'union all');

$select3 = 新选择(); $oneTwo = $select3->from(['sub' => $select1])->limit(10);