0

大家下午好，我直接进入正题。我的模型中有这段代码： 

protected $_referenceMap = Array (
    "Imagens" => Array(
        "columns"       => Array (
            'paiId'
        ),
        "refTableClass" => "ModeloImagem",
        "refColumns"    => Array(
            "id"
        ),
        "onDelete" => self::CASCADE
    )
);

我必须删除要在级联上调用的桌子上的图像，所以我想知道是否有类似的东西：

protected $_referenceMap = Array (
    "Imagens" => Array(
        "columns"       => Array (
            'paiId'
        ),
        "refTableClass" => "ModeloImagem",
        "refColumns"    => Array(
            "id"
        ),
        "onDelete" => function() {
            foreach($image as $i) {
                unlink($i);
            }
            return self::CASCADE
        }
    )
);
4

1 回答 1

1

哪有这回事。您可以做的是扩展 Zend_Db_Table 的方法_cascadeDelete($parentTableClassname, array $primaryKey)来执行该功能。

这是一种方法，尽管它是大量的代码重复；您可能必须指定要传递给回调的自己的数据，或者根据回调或查询是否失败来修改行为：

class My_Db_Table extends Zend_Db_Table
{
    const ON_DELETE_CALLBACK = 'onDeleteCallback';

    /**
     * Called by parent table's class during delete() method.
     *
     * @param  string $parentTableClassname
     * @param  array  $primaryKey
     * @return int    Number of affected rows
     */
    public function _cascadeDelete($parentTableClassname, array $primaryKey)
    {
        $rowsAffected = 0;
        foreach ($this->_getReferenceMapNormalized() as $map) {
            if ($map[self::REF_TABLE_CLASS] == $parentTableClassname && isset($map[self::ON_DELETE])) {
                switch ($map[self::ON_DELETE]) {
                    case self::CASCADE:
                        for ($i = 0; $i < count($map[self::COLUMNS]); ++$i) {
                            $col = $this->_db->foldCase($map[self::COLUMNS][$i]);
                            $refCol = $this->_db->foldCase($map[self::REF_COLUMNS][$i]);
                            $type = $this->_metadata[$col]['DATA_TYPE'];
                            $where[] = $this->_db->quoteInto(
                                $this->_db->quoteIdentifier($col, true) . ' = ?',
                                $primaryKey[$refCol], $type);
                        }
                        $this->_executeCallback($map, $where);
                        $rowsAffected += $this->delete($where);
                        break;
                    default:
                        // no action
                        break;
                }
            }
        }
        return $rowsAffected;
    }

    private function _executeCallback($map, $where) {
        if (isset($map[self::ON_DELETE_CALLBACK]) && is_callable($map[self::ON_DELETE_CALLBACK])) {
            call_user_func($map[self::ON_DELETE_CALLBACK], $where);
        }
    }
}

然后，您可以使用它来定义回调函数。但是，您不能在回调函数中定义级联；否则每次 Zend_Db_Table 试图确定是否从图像表中删除条目时，所有图像都会被删除。

protected $_referenceMap = Array (
    "Images" => Array(
        "columns"       => Array (
            'paiId'
        ),
        "refTableClass" => "ModeloImagem",
        "refColumns"    => Array(
            "id"
        ),
        "onDelete" => self::CASCADE,
        "onDeleteCallback" => function($where) {
            // Determine which image to unlink
            unlink($image);
        }
    )
);
于 2012-07-12T22:16:55.323 回答