在Zend Framework上使用表達式執行多個連接2

Question

其實我正在開發一個項目，我正在研究Zend Framework 2如何處理複雜的查詢（特別是如何連接n：m表以及如何使用GROUP_CONCAT和其他功能）。你知道最好的做法來執行這個查詢：使用此數據庫架構

SELECT o. * , x.group_one, x.group_two 
FROM table_one AS o 
LEFT JOIN (
SELECT r.fk1, GROUP_CONCAT(t.field_one) AS group_one, GROUP_CONCAT(t.field_two) AS group_two 
FROM table_three AS r 
INNER JOIN table_two AS t ON r.fk2 = t.id 
GROUP BY r.fk1 
) AS x ON o.id = x.fk1 
LIMIT 0 , 20; 

：

-- 
-- Database: `table-test-1` 
-- 

-- -------------------------------------------------------- 

-- 
-- Structure of table `table_one` 
-- 

CREATE TABLE `table_one` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, 
`field_1` varchar(255) NOT NULL, 
`field_2` varchar(255) NOT NULL, 
PRIMARY KEY (`id`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=6 ; 

-- 
-- Dump for table `table_one` 
-- 

INSERT INTO `table_one` (`id`, `field_1`, `field_2`) VALUES 
(1, 'baz', 'bat'), 
(2, 'foo', 'bar'), 
(3, 'foo2', 'bat2'), 
(4, 'fuz', 'bar2'), 
(5, 'poo', 'pee'); 

-- -------------------------------------------------------- 

-- 
-- Structure of table `table_three` 
-- 

CREATE TABLE `table_three` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, 
`fk1` bigint(20) NOT NULL, 
`fk2` bigint(20) NOT NULL, 
PRIMARY KEY (`id`), 
KEY `fk1` (`fk1`,`fk2`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=10 ; 

-- 
-- Dump for table `table_three` 
-- 

INSERT INTO `table_three` (`id`, `fk1`, `fk2`) VALUES 
(5, 1, 1), 
(1, 1, 2), 
(6, 1, 4), 
(2, 2, 2), 
(4, 3, 2), 
(7, 3, 3), 
(3, 4, 1), 
(8, 5, 3), 
(9, 5, 4); 

-- -------------------------------------------------------- 

-- 
-- Structure of table `table_two` 
-- 

CREATE TABLE `table_two` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, 
`field_one` varchar(255) NOT NULL, 
`field_two` varchar(255) NOT NULL, 
PRIMARY KEY (`id`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=5 ; 

-- 
-- Dump for table `table_two` 
-- 

INSERT INTO `table_two` (`id`, `field_one`, `field_two`) VALUES 
(1, 'label_name_1', 'label_extended_name_1'), 
(2, 'label_name_2', 'label_extended_name2'), 
(3, 'label_name_3', 'label_extended_name_3'), 
(4, 'label_name_4', 'label_extended_name4'); 

在我使用的Zend \ DB \ SQL \ sql語句用手工查詢解決的那一刻，但我想知道是否實際上有一種方法可以使用本機Select（）（可能不使用Doctrine或類似方法）。

預先感謝您:)

Answer 1

您必須導入use Zend\Db\Sql\Predicate\Expression;使用GROUP_CONCAT。

例：

$sql = new Sql($this->adapter); 
$select = $sql->select(); 
$select->columns(array('*')); 
$select->from('tblCGii'); 
$select->join("tblCGFieldValues", "tblCGii.id = tblCGFieldValues.Cgii_id", array("field_values"=>new Expression("Group_Concat(tblCGFieldValues.field_values)")),"LEFT"); 
$select->group('tblCGii.id');