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HomeBackend DevelopmentPHP TutorialYii2.0高级框架数据库增删改查的一些操作_PHP

yii2.0框架是PHP开发的一个比较高效率的框架,集合了作者的大量心血,下面通过用户为例给大家详解yii2使用中的一些基本的增删改查操作。

User::find()->all();    //返回所有用户数据;
User::findOne($id);   //返回 主键 id=1  的一条数据;
User::find()->where(['name' => 'ttt'])->one();   //返回 ['name' => 'ttt'] 的一条数据;
User::find()->where(['name' => 'ttt'])->all();   //返回 ['name' => 'ttt'] 的所有数据;
User::findBySql('SELECT * FROM user')->all();  //用 sql  语句查询 user 表里面的所有数据;
User::findBySql('SELECT * FROM user')->one();  此方法是用 sql  语句查询 user 表里面的一条数据;
User::find()->andWhere(['sex' => '女', 'age' => '18'])->count('id');   //统计符合条件的总条数;
User::find()->one();    //返回一条数据;
User::find()->all();    //返回所有数据;
User::find()->count();    //返回记录的数量;
User::find()->average();   //返回指定列的平均值;
User::find()->min();    //返回指定列的最小值 ;
User::find()->max();   //返回指定列的最大值 ;
User::find()->scalar();    //返回值的第一行第一列的查询结果;
User::find()->column();    //返回查询结果中的第一列的值;
User::find()->exists();    //返回一个值指示是否包含查询结果的数据行;

yii2的group查询,以用户为例:

User::find()->addGroupBy('title')->all();根据title进行分组

1、增加 (insert)

$model = new User();
$model->username = '小伙儿';
$model->insert();

对数据库 删除的一些简单的操作,还是老样子,上面我写代码,如果样式混乱,我会附上截图。还是用 user 表为例

User::deleteAll('name = 小伙儿');    删除 name = 小伙儿 的数据;
User::findOne($id)->delete(); 删除主键为 $id变量 值的数据库;
User::deleteAll('age > :age AND sex = :sex', [':age' => '20', ':sex' => '1']);  删除符合条件的数据;

推荐阅读:从零开始学YII2框架(一)通过Composer安装Yii2框架,相信对大家学习yii2会有所帮助的。

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