Yii2.0-advanced-10—資料庫操作4(AR條件查詢where)
阿新 • • 發佈:2019-02-05
條件查詢
$customers = Customer::find()->where($cond)->all();
$cond就是我們所謂的條件,條件的寫法也根據查詢資料的不同存在差異,那麼如何用yii2的方式來寫查詢條件呢?
[[簡單條件]]
// SQL: (type = 1) AND (status = 2). $cond = ['type' => 1, 'status' => 2] // SQL:(id IN (1, 2, 3)) AND (status = 2) $cond = ['id' => [1, 2, 3], 'status' => 2] //SQL:status IS NULL $cond = ['status' => null]
[[and]]:將不同的條件組合在一起,用法舉例:
//SQL:`id=1 AND id=2` $cond = ['and', 'id=1', 'id=2'] //SQL:`type=1 AND (id=1 OR id=2)` $cond = ['and', 'type=1', ['or', 'id=1', 'id=2']] //SQL:`type=1 AND (id=1 OR id=2)` //此寫法'='可以換成其他操作符,例:in like != >=等 $cond = [ 'and', ['=', 'type', 1], [ 'or', ['=', 'id', '1'], ['=', 'id', '2'], ] ]
[[or]]:
//SQL:`(type IN (7, 8, 9) OR (id IN (1, 2, 3)))`
$cond = ['or', ['type' => [7, 8, 9]], ['id' => [1, 2, 3]]
[[not]]:
//SQL:`NOT (attribute IS NULL)`
$cond = ['not', ['attribute' => null]]
[[between]]: not between 用法相同
//SQL:`id BETWEEN 1 AND 10`
$cond = ['between', 'id', 1, 10]
[[in]]:
//SQL:`id IN (1, 2, 3)`
$cond = ['in', 'id', [1, 2, 3]] or $cond = ['id'=>[1, 2, 3]]
//IN條件也適用於多欄位
$cond = ['in', ['id', 'name'], [['id' => 1, 'name' => 'foo'], ['id' => 2, 'name' => 'bar']]]
//也適用於內嵌sql語句
$cond = ['in', 'user_id', (new Query())->select('id')->from('users')->where(['active' => 1])]
[[like]]:
//SQL:`name LIKE '%tester%'`
$cond = ['like', 'name', 'tester']
//SQL:`name LIKE '%test%' AND name LIKE '%sample%'`
$cond = ['like', 'name', ['test', 'sample']]
//SQL:`name LIKE '%tester'`
$cond = ['like', 'name', '%tester', false]
[[exists]]: not exists用法類似
//SQL:EXISTS (SELECT "id" FROM "users" WHERE "active"=1)
$cond = ['exists', (new Query())->select('id')->from('users')->where(['active' => 1])]
此外,您可以指定任意運算子如下
//SQL:`id >= 10`
$cond = ['>=', 'id', 10]
//SQL:`id != 10`
$cond = ['!=', 'id', 10]