Question

我正在使用ZF2和SQL Server 2012.我正在尝试使用分页编写联合查询。

似乎对ZF2中的工会的支持并不完全存在。没有union()方法，但我发现有combine()方法。它使用union创建查询，但它将ORDER BY放在第一个查询而不是整个联合查询上。因此，当ZF2分页器尝试添加限制/偏移部分时，SQL Server会因为在整个查询中必须有ORDER BY而窒息。

这是我的代码：

public function fetchPage($fkADUser, array $orderBy, $page = 1, $limit = 20) {

    $inboxSelect = $this->inboxTableGateway->getSql()
        ->select()
        ->columns([
            'pkid',
        ])
        ->join(['f' => 'Fax'], 'FaxInbound.fkFax = f.pkid', [
            'PageCount',
            'CreateTime',
        ])
        ->where(['f.fkADUser = ?' => $fkADUser])
        ->where('FaxInbound.DeleteTime IS NOT NULL');

    $sentSelect = $this->sentTableGateway->getSql()
        ->select()
        ->columns([
            'pkid',
        ])
        ->join(['f' => 'Fax'], 'FaxOutbound.fkFax = f.pkid', [
            'PageCount',
            'CreateTime',
        ])
        ->where(['f.fkADUser = ?' => $fkADUser])
        ->where('FaxOutbound.DeleteTime IS NOT NULL');

    $inboxSelect->combine($sentSelect)->order($orderBy);

    return $this->inboxTableGateway->paginate($inboxSelect, $page, $limit, $this->resultSetPrototype);
}

这是从SQL Profiler生成的查询：

(
    SELECT
        [FaxInbound].[pkid] AS [pkid],
        [f].[PageCount] AS [PageCount],
        [f].[CreateTime] AS [CreateTime]
    FROM
        [FaxInbound]
        INNER JOIN [Fax] AS [f]
            ON [FaxInbound].[fkFax] = [f].[pkid]
    WHERE
        f.fkADUser = @P1
        AND FaxInbound.DeleteTime IS NOT NULL
    ORDER BY
        [CreateTime] DESC
) UNION (
    SELECT
        [FaxOutbound].[pkid] AS [pkid],
        [f].[PageCount] AS [PageCount],
        [f].[CreateTime] AS [CreateTime]
    FROM
        [FaxOutbound]
        INNER JOIN [Fax] AS [f]
            ON [FaxOutbound].[fkFax] = [f].[pkid]
    WHERE
        f.fkADUser = @P2
        AND FaxOutbound.DeleteTime IS NOT NULL
)
OFFSET 0 ROWS
FETCH NEXT 20 ROWS ONLY

请注意，ORDER BY位于第一个查询而不是整个联合查询。所以我得到的错误信息是：

Msg 156, Level 15, State 1, Line 13
Incorrect syntax near the keyword 'ORDER'.
Msg 102, Level 15, State 1, Line 28
Incorrect syntax near 'OFFSET'.
Msg 153, Level 15, State 2, Line 29
Invalid usage of the option NEXT in the FETCH statement.

但是，如果我将ORDER BY移到OFFSET之外，那么查询就可以了。

所以问题是，有没有人知道如何将ORDER BY放在整个查询而不是第一个问题上？或者，有没有办法让我使用手动编写的查询来使用ZF2 Paginator？

Answer 1

看起来ZF2中存在错误。我将其添加到ZF2 issue tracker。

我通过重新排序Zend \ Db \ Sql \ Select :: $ specifications中的条目来解决了这个问题。

原件：

protected $specifications = array(
    'statementStart' => '%1$s',
    self::SELECT => array(...),
    self::JOINS  => array(...),
    self::WHERE  => 'WHERE %1$s',
    self::GROUP  => array(...),
    self::HAVING => 'HAVING %1$s',
    self::ORDER  => array(...),
    self::LIMIT  => 'LIMIT %1$s',
    self::OFFSET => 'OFFSET %1$s',
    'statementEnd' => '%1$s',
    self::COMBINE => '%1$s ( %2$s )',
);

新：

protected $specifications = array(
    'statementStart' => '%1$s',
    self::SELECT => array(...),
    self::JOINS  => array(...),
    self::WHERE  => 'WHERE %1$s',
    self::GROUP  => array(...),
    self::HAVING => 'HAVING %1$s',
    'statementEnd' => '%1$s',
    self::COMBINE => '%1$s ( %2$s )',
    self::ORDER  => array(...),
    self::LIMIT  => 'LIMIT %1$s',
    self::OFFSET => 'OFFSET %1$s',
);

我刚刚将ORDER，LIMIT和OFFSET移到了最后。这为我修复了查询。

ZF2联盟+分页

1 个答案: