yii2.0增刪改查

[php]  view plain  copy

 

//關閉csrf
public $enableCsrfValidation = false;

 

1.sql語句

//查詢

$db=\Yii::$app->db ->createCommand("select * from 表名") ->queryAll();

//修改

$db=\Yii::$app->db ->createCommand()->update('表名',['字段名'=>要修改的值],'條件') ->execute();

// 刪除

$db=\Yii::$app->db ->createCommand() ->delete('表名','條件') ->execute();

 //添加

$db=\Yii::$app->db ->createCommand() ->insert('表名',['字段名'=>要添加的值],'條件') ->execute();

//應用實例

    Customer::find()->one();    此方法返回一條數據；

    Customer::find()->all();    此方法返回全部數據；

    Customer::find()->count();    此方法返回記錄的數量；

    Customer::find()->average();    此方法返回指定列的平均值；

    Customer::find()->min();    此方法返回指定列的最小值 ；

    Customer::find()->max();    此方法返回指定列的最大值 ；

    Customer::find()->scalar();    此方法返回值的第一行第一列的查詢結果；

    Customer::find()->column();    此方法返回查詢結果中的第一列的值；

    Customer::find()->exists();    此方法返回一個值指示是否包含查詢結果的數據行；

    Customer::find()->asArray()->one();    以數組形式返回一條數據；

    Customer::find()->asArray()->all();    以數組形式返回全部數據；

    Customer::find()->where($condition)->asArray()->one();    根據條件以數組形式返回一條數據；

    Customer::find()->where($condition)->asArray()->all();    根據條件以數組形式返回全部數據；

    Customer::find()->where($condition)->asArray()->orderBy('id DESC')->all();    根據條件以數組形式返回全部數據,並根據ID倒序；

3.關聯查詢    
    ActiveRecord::hasOne()：返回對應關係的單條記錄

ActiveRecord::hasMany()：返回對應關係的多條記錄

應用實例

    //客戶表Model：CustomerModel
    //訂單表Model：OrdersModel
    //國家表Model：CountrysModel
    //首先要創建表與表之間的關係
    //在CustomerModel中添加與訂單的關係

    Class CustomerModel extends yiidbActiveRecord
    {
    ...

    public function getOrders()
    {
        //客戶和訂單是一對多的關係因此用hasMany
        //此處OrdersModel在CustomerModel頂部別忘了加對應的命名空間
        //id對應的是OrdersModel的id字段，order_id對應CustomerModel的order_id字段
        return $this->hasMany(OrdersModel::className(), ['id'=>'order_id']);
    }

    public function getCountry()
    {
        //客戶和國家是一對一的關係因此用hasOne
        return $this->hasOne(CountrysModel::className(), ['id'=>'Country_id']);
    }
    ....
    }

    // 查詢客戶與他們的訂單和國家
    CustomerModel::find()->with('orders', 'country')->all();

    // 查詢客戶與他們的訂單和訂單的發貨地址
    CustomerModel::find()->with('orders.address')->all();

    // 查詢客戶與他們的國家和狀態爲1的訂單
    CustomerModel::find()->with([
    'orders' => function ($query) {
        $query->andWhere('status = 1');
        },
        'country',
    ])->all();

注：with中的orders對應getOrders

常見問題：

1.在查詢時加了->select();以下，要加上order_id，即關聯的字段（好比：order_id）好比要在select中，不然會報錯：undefined index order_id

//查詢客戶與他們的訂單和國家
CustomerModel::find()->select('order_id')->with('orders', 'country')->all();

findOne()和findAll():

//查詢key值爲10的客戶
$customer = Customer::findOne(10);
$customer = Customer::find()->where(['id' => 10])->one();

//查詢年齡爲30，狀態值爲1的客戶
$customer = Customer::findOne(['age' => 30, 'status' => 1]);
$customer = Customer::find()->where(['age' => 30, 'status' => 1])->one();

//查詢key值爲10的全部客戶
$customers = Customer::findAll(10);
$customers = Customer::find()->where(['id' => 10])->all();

//查詢key值爲10，11,12的客戶
$customers = Customer::findAll([10, 11, 12]);
$customers = Customer::find()->where(['id' => [10, 11, 12]])->all();

//查詢年齡爲30，狀態值爲1的全部客戶
$customers = Customer::findAll(['age' => 30, 'status' => 1]);
$customers = Customer::find()->where(['age' => 30, 'status' => 1])->all();

---

where()條件：

$customers = Customer::find()->where($cond)->all(); 

$cond寫法舉例：

//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]]:將不一樣的條件組合在一塊兒，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']]

[[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]]: not in 用法相似

 

//SQL:`id IN (1, 2, 3)`
$cond = ['in', 'id', [1, 2, 3]]

//IN條件也適用於多字段
$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用法相似

//SQL:EXISTS (SELECT "id" FROM "users" WHERE "active"=1)
$cond = ['exists', (new Query())->select('id')->from('users')->where(['active' => 1])]

此外，您能夠指定任意運算符以下

//SQL:`id >= 10`
$cond = ['>=', 'id', 10]

//SQL:`id != 10`
$cond = ['!=', 'id', 10]

---

經常使用查詢：

//WHERE admin_id >= 10 LIMIT 0,10
p;     User::find()->select('*')->where(['>=', 'admin_id', 10])->offset(0)->limit(10)->all()

    //SELECT `id`, (SELECT COUNT(*) FROM `user`) AS `count` FROM `post`
     $subQuery = (new Query())->select('COUNT(*)')->from('user');
     $query = (new Query())->select(['id', 'count' => $subQuery])->from('post');

  //SELECT DISTINCT `user_id` ...
     User::find()->select('user_id')->distinct();

更新：

//update();
//runValidation boolen 是否經過validate()校驗字段 默認爲true
//attributeNames array 須要更新的字段
$model->update($runValidation , $attributeNames);

//updateAll();
//update customer set status = 1 where status = 2
Customer::updateAll(['status' => 1], 'status = 2');

//update customer set status = 1 where status = 2 and uid = 1;
Customer::updateAll(['status' => 1], ['status'=> '2','uid'=>'1']);

刪除：

$model = Customer::findOne($id);
$model->delete();

$model->deleteAll(['id'=>1]);

 

批量插入：

    Yii::$app->db->createCommand()->batchInsert(UserModel::tableName(), ['user_id','username'], [
    ['1','test1'],
    ['2','test2'],
    ['3','test3'],
    ])->execute();

查看執行sql

//UserModel
$query = UserModel::find()->where(['status'=>1]);
echo $query->createCommand()->getRawSql();