Yii2数据库操作常用方法小结

本文实例讲述了Yii2数据库操作常用方法。分享给大家供大家参考，具体如下：

查询：

// find the customers whose primary key value is 10$customers = Customer::findAll(10);$customer = Customer::findOne(10);// the above code is equivalent to:$customers = Customer::find()->where(["id" => 10])->all();// find the customers whose primary key value is 10, 11 or 12.$customers = Customer::findAll([10, 11, 12]);$customers = Customer::find()->where(["IN","id",[10,11,12]])->all();// the above code is equivalent to:$customers = Customer::find()->where(["id" => [10, 11, 12]])->all();// find customers whose age is 30 and whose status is 1$customers = Customer::findAll(["age" => 30, "status" => 1]);// the above code is equivalent to:$customers = Customer::find()->where(["age" => 30, "status" => 1])->all();// use params binding$customers = Customer::find()->where("age=:age AND status=:status")->addParams([":age"=>30,":status"=>1])->all();// use index$customers = Customer::find()->indexBy("id")->where(["age" => 30, "status" => 1])->all();// get customers count$count = Customer::find()->where(["age" => 30, "status" => 1])->count();// add addition condition$customers = Customer::find()->where(["age" => 30, "status" => 1])->andWhere("score > 100")->orderBy("id DESC")->offset(5)->limit(10)->all();// find by sql$customers = Customer::findBySql("SELECT * FROM customer WHERE age=30 AND status=1 AND score>100 ORDER BY id DESC LIMIT 5,10")->all();

修改：

// update status for customer-10$customer = Customer::findOne(10);$customer->status = 1;$customer->update();// the above code is equivalent to:Customer::updateAll(["status" => 1], "id = :id",[":id"=>10]);

删除：

// delete customer-10Customer::findOne(10)->delete();// the above code is equivalent to:Customer::deleteAll(["status" => 1], "id = :id",[":id"=>10]);

----------------使用子查询----------------------

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

----------------手写SQL-----------------------

// select$customers = Yii::$app->db->createCommand("SELECT * FROM customer")->queryAll();// updateYii::$app->db->createCommand()->update("customer",["status"=>1],"id=10")->execute();// deleteYii::$app->db->createCommand()->delete("customer","id=10")->execute();//transaction// outer$transaction1 = $connection->beginTransaction();try {  $connection->createCommand($sql1)->execute();  // internal  $transaction2 = $connection->beginTransaction();  try {    $connection->createCommand($sql2)->execute();    $transaction2->commit();  } catch (Exception $e) {    $transaction2->rollBack();  }  $transaction1->commit();} catch (Exception $e) {  $transaction1->rollBack();}

---------------主从配置----------------------

[  "class" => "yiidbConnection",  // master  "dsn" => "dsn for master server",  "username" => "master",  "password" => "",  // slaves  "slaveConfig" => [    "username" => "slave",    "password" => "",    "attributes" => [      // use a smaller connection timeout      PDO::ATTR_TIMEOUT => 10,    ],  ],  "slaves" => [    ["dsn" => "dsn for slave server 1"],    ["dsn" => "dsn for slave server 2"],    ["dsn" => "dsn for slave server 3"],    ["dsn" => "dsn for slave server 4"],  ],]

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希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。