yii2.0 速查表

// 获得数据库连接

$conn = Yii::$app->db;

// 执行数据库查询语句

Yii::$app->db->createCommand("SELECT * FROM `user`");Yii::$app->db->createCommand("SELECT * FROM `user` WHERE uid=:uid",[":uid"=>1]);Yii::$app->db->createCommand("SELECT * FROM `user` WHERE uid=:uid")->addValue([":uid"=>1]);

// SQL语句插入数据

Yii::$app->db->createCommand('INSERT INTO user (email, password) VALUES("test3@example.com", "test3");')->execute();

// 数组形式插入数据

Yii::$app->db->createCommand()->insert('user', ['email'=>'test4@example.com','password'=>'changeme7','first_name'=>'Test'])->execute();

// 批量插入数据

Yii::$app->db->createCommand()->batchInsert('user', ['email','password','first_name'],[['james.franklin@example.com','changeme7','James'],['linda.marks@example.com','changeme7','Linda']['roger.martin@example.com','changeme7']])->execute();

// 更新数据

Yii::$app->db->createCommand()->update('user', ['updated_at'=> time()],'id = 2')->execute();

// 删除数据

Yii::$app->db->createCommand()->delete('user','id = 3')->execute();

获取结果方法

// 获取所有数据(数组形式返回)

Yii::$app->db->createCommand("SELECT * FROM `user`")->queryAll();

// 获取一条数据（一维数组）

Yii::$app->db->createCommand("SELECT * FROM `user` WHERE id = 1")->queryOne();

// 获取一个值

Yii::$app->db->createCommand("SELECT count(*) AS total FROM `user` WHERE id = 1")->queryScalar();

// 获取某一列（放到一位数组中）

Yii::$app->db->createCommand("SELECT username FROM `user`")->queryColumn();