# 函数原型 ~~~ public function join($mixTable, $mixCols = '*', $mixCond /* args */); ~~~ # $mixTable 和 $mixCols 与 table 方法中的用法一致 ~~~ # SELECT `test`.*,`hello`.`name`,`hello`.`value` FROM `test` INNER JOIN `hello` ON `test`.`name` = '小牛' database::table ( 'test')->join('hello','name,value', 'name','=','小牛' )->getAll (); # SELECT `test`.*,`t`.`name` AS `nikename`,`t`.`value` AS `tt` FROM `test` INNER JOIN `hello` `t` ON `test`.`name` = '小牛' database::table ( 'test')->join(['t' => 'hello'],['name as nikename','tt' => 'value'], 'name','=','小牛' )->getAll (); ~~~ # $mixCond 与 where 方法中的用法一致 去掉前面两个参数，后面的全部都是条件参数。 ~~~ # SELECT `test`.*,`hello`.`name`,`hello`.`value` FROM `test` INNER JOIN `hello` ON `test`.`hello` = 'world' AND `test`.`test` > `test`.`name` database::table ( 'test')->join('hello','name,value', ['hello' => 'world',['test','>','{[name]}']] )->getAll (); # SELECT `test`.*,`hello`.`name`,`hello`.`value` FROM `test` INNER JOIN `hello` ON (`hello`.`id` < 5 AND `hello`.`name` LIKE 'hello') database::table ( 'test')->join('hello','name,value', function($objSelect){ $objSelect->where('id','<',5)->where('name','like','hello'); } )->getAll (); ~~~ # innerJoin 与 join 一致 ~~~ # SELECT `test`.*,`t`.`name` AS `nikename`,`t`.`value` AS `tt` FROM `test` INNER JOIN `hello` `t` ON `t`.`name` = '小牛' database::table ( 'test')->innerJoin(['t' => 'hello'],['name as nikename','tt' => 'value'], 'name','=','小牛' )->getAll (); ~~~ # leftJoin ~~~ # SELECT `test`.*,`t`.`name` AS `nikename`,`t`.`value` AS `tt` FROM `test` LEFT JOIN `hello` `t` ON `t`.`name` = '小牛' database::table ( 'test')->innerJoin(['t' => 'hello'],['name as nikename','tt' => 'value'], 'name','=','小牛' )->getAll (); ~~~ # rightJoin ~~~ # SELECT `test`.*,`t`.`name` AS `nikename`,`t`.`value` AS `tt` FROM `test` RIGHT JOIN `hello` `t` ON `t`.`name` = '小牛' database::table ( 'test')->rightJoin(['t' => 'hello'],['name as nikename','tt' => 'value'], 'name','=','小牛' )->getAll (); ~~~ # fullJoin ~~~ # SELECT `test`.*,`t`.`name` AS `nikename`,`t`.`value` AS `tt` FROM `test` FULL JOIN `hello` `t` ON `t`.`name` = '小牛' database::table ( 'test')->fullJoin(['t' => 'hello'],['name as nikename','tt' => 'value'], 'name','=','小牛' )->getAll (); ~~~ # crossJoin 交叉连接不用设置 on 条件。 ~~~ # SELECT `test`.*,`t`.`name` AS `nikename`,`t`.`value` AS `tt` FROM `test` CROSS JOIN `hello` `t` database::table ( 'test')->crossJoin(['t' => 'hello'],['name as nikename','tt' => 'value'] )->getAll (); ~~~ # naturalJoin 自然连接不用设置 on 条件。 ~~~ # SELECT `test`.*,`t`.`name` AS `nikename`,`t`.`value` AS `tt` FROM `test` NATURAL JOIN `hello` `t` database::table ( 'test')->naturalJoin(['t' => 'hello'],['name as nikename','tt' => 'value'] )->getAll (); ~~~