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：

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',[10,12]])->all(); // the above code is equivalent to: $customers = Customer::find()->where(['id' => [10,12]])->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：

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

删除：

delete(); // the above code is equivalent to: Customer::deleteall(['status' => 1],[':id'=>10]);

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

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-----------------------

db->createCommand('SELECT * FROM customer')->queryAll(); // update Yii::$app->db->createCommand()->update('customer',['status'=>1],'id=10')->execute(); // delete Yii::$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----------------------

'yii\db\Connection',// master 'dsn' => 'dsn for master server','username' => 'master','password' => '',// slaves 'slaveConfig' => [ 'username' => 'slave','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'],]

更多关于Yii相关内容感兴趣的读者可查看本站专题：《》、《》、《》、《》、《》、《》及《PHP常见数据库操作技巧汇总》

希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。

原文地址：https://www.jb51.cc/php/17521.html