~~~ 熟悉Yii2的查询条件后，用Active Record查询数据非常方便。 以下我们介绍where()方法当中，条件的拼装方式。 #某个值为null，会用IS NULL来生成语句: ['type' => 1, 'status' => 2] // 生成：(type = 1) AND (status = 2) ['id' => [1, 2, 3], 'status' => 2] // 生成：(id IN (1, 2, 3)) AND (status = 2) ['status' => null] // 生成：status IS NULL ['NOT', ['type' => null]] // 生成：type IS NOT NULL #对比 ['>', 'id', 1] // 生成：id > 1 ['<', 'id', 100] // 生成：id < 100 ['=', 'id', 10] // 生成：id = 10 ['>=', 'id', 1] // 生成：id >= 1 ['<=', 'id', 100] // 生成：id <= 100 ['!=', 'id', 10] // 生成：id != 10 ['and', 'id' => 1, 'id' => 2] // 生成：id=1 AND id=2 ['and', 'id=1', 'id=2'] // 生成：id=1 AND id=2 ['and', 'type=1', ['or', 'id=1', 'id=2']] // 生成：type=1 AND (id=1 OR id=2) ['or', ['type' => [7, 8, 9]], ['id' => [1, 2, 3]]] // 生成：(type IN (7, 8, 9) OR (id IN (1, 2, 3))) ['not', ['attribute' => null]] // 生成：NOT (attribute IS NULL) ['between', 'id', 1, 10] // 生成：id BETWEEN 1 AND 10 ['not between', 'id', 1, 10] // 生成：id NOT BETWEEN 1 AND 10 ['in', 'id', [1, 2, 3]] // 生成：id IN (1, 2, 3) ['id' => [4, 8, 15]] // 生成：id IN (4, 8, 15) ['not in', 'id', [1, 2, 3]] // 生成：id NOT IN (1, 2, 3) ['in', ['id', 'name'], [['id' => 1, 'name' => 'foo'], ['id' => 2, 'name' => 'bar']]] // 生成：(`id`, `name`) IN ((1, 'foo'), (2, 'bar')) #用子查询作为IN条件的值，如下： ['in', 'user_id', (new Query())->select('id')->from('users')->where(['active' => 1])] ['like', 'name', 'tester'] // 生成：name LIKE '%tester%' ['like', 'name', ['test', 'sample']] // 生成：name LIKE '%test%' AND name LIKE '%sample%' ['like', 'name', '%tester', false] // 生成：name LIKE '%tester' // 这是自定义查询方式，要传入值为false的运算数3，并且自行添加% ['or like', 'name', ['test', 'sample']] // 生成：name LIKE '%test%' OR name LIKE '%sample%' ['not like', 'name', 'tester'] // 生成：name NOT LIKE '%tester%' ['or not like', 'name', ['test', 'sample']] // 生成：name NOT LIKE '%test%' OR name NOT LIKE '%sample%' ['exists', (new Query())->select('id')->from('users')->where(['active' => 1])] // 生成：EXISTS (SELECT "id" FROM "users" WHERE "active"=1) ~~~