where条件怎么写

说明

where方法可以多次调用

一、根据主键查询

$db->table('user')->where(100)->row(); //等价于where('id', 100)
// SELECT * FROM `user` WHERE `id` = 100

二、查询表达式

$db->table('user')
    ->fields('id, nickname, avatar')
    ->where('grade', '>', 4)
    ->where('status', 1) //等于可以简写成这种
    ->select();
// SELECT id, nickname, avatar FROM `user` WHERE `grade` > 4 AND `status` = 1

更多查询表达式

=、>、<、<>、>=、<= 
between、in、like、find_in_set

where('grade', 'between', [3, 5])
where('id', 'in', [1,3,4,6,8])
where('nickname', 'like', '%timo%')
$db->table('user')->where('pids', 'find_in_set', 10)->select();

三、索引数组

$db->table('user')
    ->where([
        ['grade', 'between', [3,5]],
        ['status', 1]
    ])->select();
// SELECT * FROM `user` WHERE `grade` BETWEEN 3 AND 5 AND `status` = 1

四、关联数组

$db->table('user')
    ->where(['grade' => ['between', 3, 5], 'status' => 1])
    ->select();
// SELECT * FROM `user` WHERE `grade` BETWEEN 3 AND 5 AND `status` = 1

五、or条件查询

我们不推荐在项目中使用or查询

简单

$user = $db->table('user')
    ->where('sex', 2)
    ->orWhere('sex', 0)
    ->select();
var_dump($db->getLastSql());
// SELECT * FROM `user` WHERE `sex` = 2 OR `sex` = 0

复杂

$user = $db->table('user')
    ->where('sex', 2)
    ->orWhere(function () {
        return [
            'sex' => 0,
            'status' => 1
        ];
    })
    ->select();
var_dump($db->getLastSql());
// SELECT * FROM `user` WHERE `sex` = 2 OR (`sex` = 0 AND `status` = 1)