Join()

JOIN_TYPE = INNER JOIN, LEFT OUTER JOIN, RIGHT OUTER JOIN, FULL OUTER JOIN 等等

语法

$query = new Query;
$query  ->select(['SELECT COLUMNS'])  ->from('TABLE_NAME_1')->join( 'JOIN_TYPE', 'TABLE_NAME_2','TABLE_NAME_2.COLUMN =TABLE_NAME_1.COLUMN' ); $command = $query->createCommand(); $data = $command->queryAll(); 

示例一

$query = new Query;
$query  ->select(['tbl_user.username AS name', 'tbl_category.categoryname as  Category','tbl_document.documentname'])  ->from('tbl_user')->join('LEFT OUTER JOIN', 'tbl_category', 'tbl_category.createdby =tbl_user.userid') ->join('LEFT OUTER JOIN', 'tbl_document', 'tbl_category.cid =tbl_document.did') ->LIMIT(5) ; $command = $query->createCommand(); $data = $command->queryAll(); 

输出语句

SELECT `tbl_user`.`username` AS `name`, `tbl_category`.`categoryname` AS `Category` FROM `tbl_user` LEFT OUTER JOIN `tbl_category` ON tbl_category.createdby =tbl_user.userid LEFT OUTER JOIN `tbl_document` ON tbl_category.cid =tbl_document.did LIMIT 5 

leftJoin()

示例一

$query = new Query;
$query  ->select(['tbl_user.username AS name', 'tbl_category.type as Category'])  ->from('tbl_user')->leftJoin('tbl_category', 'tbl_category.createdby = tbl_user.userid') ->limit(2); $command = $query->createCommand(); $data = $command->queryAll(); 

输出语句

SELECT `tbl_user`.`username` AS `name`, `tbl_category`.`type` AS `Category`FROM `tbl_user` LEFT JOIN `tbl_category` ON tbl_category.createdby = tbl_user.useridd LIMIT 2