PHP的Yii框架中使用数据库的配置和SQL操作实例教(4)

// 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-10 Customer::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(); // 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--------------------------------------------

[ 'class' => 'yii\db\Connection', // 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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