Yii数据库操作_MySQL

参考：https://github.com/yii2-chinesization/yii2-zh-cn/blob/master/guide-zh-CN/db-dao.md

返回多行：

$command = $connection->createCommand('SELECT * FROM post');$posts = $command->queryAll();

翻译单行：

$command = $connection->createCommand('SELECT * FROM post WHERE id=1');$post = $command->queryOne();

查询多列：

$command = $connection->createCommand('SELECT title FROM post');$titles = $command->queryColumn();

查询标量/计算值：

$command = $connection->createCommand('SELECT COUNT(*) FROM post');$postCount = $command->queryScalar();

更新数据：

$command = $connection->createCommand('UPDATE post SET status=1 WHERE id=1');$command->execute();

一次插入单行/多行：

// INSERT	$connection->createCommand()->insert('user', [	    'name' => 'Sam',	    'age' => 30,	])->execute();// INSERT 一次插入多行	$connection->createCommand()->batchInsert('user', ['name', 'age'], [	    ['Tom', 30],	    ['Jane', 20],	    ['Linda', 25],	])->execute();

更新：

$connection->createCommand()->update('user', ['status' => 1], 'age > 30')->execute();

删除：

$connection->createCommand()->delete('user', 'status = 0')->execute();

预处理：

$command = $connection->createCommand('SELECT * FROM post WHERE id=:id');$command->bindValue(':id', $_GET['id']);$post = $command->query();

一次预处理语句执行多次：

$command = $connection->createCommand('DELETE FROM post WHERE id=:id');$command->bindParam(':id', $id);	$id = 1;$command->execute();	$id = 2;$command->execute();

建表：

$connection->createCommand()->createTable('post', [	  'id' => 'pk',	   'title' => 'string',	   'text' => 'text',]);