二、查询对象的方法
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 //根据主键查询出一个对象,如：findByPk(1); $admin =Admin::model()->findByPk( $postID , $condition , $params ); $admin =Admin::model()->findByPk(1); //根据一个条件查询出一组数据,可能是多个,但是他只返回第一行数据 $row =Admin::model()->find( $condition , $params ); $row =Admin::model()->find( 'username=:name' , array ( ':name' => 'admin' )); //该方法是根据条件查询一组数据,可以是多个条件,把条件放到数组里面,查询的也是第一条数据 $admin =Admin::model()->findByAttributes( $attributes , $condition , $params ); $admin =Admin::model()->findByAttributes( array ( 'username' => 'admin' )); //该方法是根据SQL语句查询一组数据,他查询的也是第一条数据 $admin =Admin::model()->findBySql( $sql , $params ); $admin =Admin::model()->findBySql( "select * from admin where username=:name" , array ( ':name' => 'admin' )); //拼一个获得SQL的方法,在根据find查询出一个对象 $criteria = new CDbCriteria; $criteria ->select= 'username' ; // only select the 'title' column $criteria ->condition= 'username=:username' ; $criteria ->params= array ( ":username=>'admin'" ); $criteria ->order = "id DESC" ; $criteria ->limit = "3" ; $post =Post::model()->find( $criteria ); // $params isnot needed三、查询个数,判断查询是否有结果
1 2 3 4 5 6 7 8 9 10 11 //该方法是根据一个条件查询一个集合有多少条记录,返回一个int型数字 $n =Post::model()-> count ( $condition , $params ); $n =Post::model()-> count ( "username=:name" , array ( ":name" => $username )); //该方法是根据SQL语句查询一个集合有多少条记录,返回一个int型数字 $n =Post::model()->countBySql( $sql , $params ); $n =Post::model()->countBySql( "select * from admin where username=:name" , array ( ':name' => 'admin' )); //该方法是根据一个条件查询查询得到的数组有没有数据,如果有数据返回一个true,否则没有找到 $exists =Post::model()->exists( $condition , $params ); $exists =Post::model()->exists( "name=:name" , array ( ":name" => $username ));四、添加的方法
1 2 3 4 $admin = new Admin; $admin ->username = $username ; $admin ->password = $password ; if ( $admin ->save() > 0){ echo "添加成功" ; } else { echo "添加失败" ; }五、修改的方法
1 2 3 4 5 6 7 8 9 10 11 12 13 14 Post::model()->updateAll( $attributes , $condition , $params ); $count =Admin::model()->updateAll( array ( 'username' => '11111' , 'password' => '11111' ), 'password=:pass' , array ( ':pass' => '1111a1' )); if ( $count > 0){ echo "修改成功" ; } else { echo "修改失败" ; } //$pk主键,可以是一个也可以是一个集合,$attributes是要修改的字段的集合,$condition条件,$params传入的值 Post::model()->updateByPk( $pk , $attributes , $condition , $params ); $count =Admin::model()->updateByPk(1, array ( 'username' => 'admin' , 'password' => 'admin' )); $count =Admin::model()->updateByPk( array (1,2), array ( 'username' => 'admin' , 'password' => 'admin' ), 'username=:name' , array ( ':name' => 'admin' )); if ( $count >0){ echo "修改成功" ; } else { echo "修改失败" ; } Post::model()->updateCounters( $counters , $condition , $params ); $count =Admin::model()->updateCounters( array ( 'status' =>1), 'username=:name' , array ( ':name' => 'admin' )); if ( $count > 0){ echo "修改成功" ; } else { echo "修改失败" ; } //array('status'=>1)代表数据库中的admin表根据条件username='admin',查询出的所有结果status字段都自加1六、删除的方法
1 2 3 4 5 6 7 8 9 10 11 //deleteAll Post::model()->deleteAll( $condition , $params ); $count = Admin::model()->deleteAll( 'username=:name and password=:pass' , array ( ':name' => 'admin' , ':pass' => 'admin' )); $count = Admin::model()->deleteAll( 'id in("1,2,3")' ); //删除id为这些的数据 if ( $count >0){ echo "删除成功" ; } else { echo "删除失败" ; } //deleteByPk Post::model()->deleteByPk( $pk , $condition , $params ); $count = Admin::model()->deleteByPk(1); $count =Admin::model()->deleteByPk( array (1,2), 'username=:name' , array ( ':name' => 'admin' )); if ( $count >0){ echo "删除成功" ; } else { echo "删除失败" ; }七、更多方法
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 //createCommand(执行原生的SQL语句) $sql = "SELECT u.account,i.* FROM sys_user as u left join user_info as i on u.id=i.user_id" ; $rows =Yii::app()->db->createCommand( $sql )->query(); foreach ( $rows as $k => $v ){ echo $v [ 'add_time' ]; } //事务的基本结构(多表更新插入操作请使用事务处理) $dbTrans = Yii::app()->db->beginTransaction(); try { $post = new Post; $post -> 'title' = 'Hello dodobook!!!' ; if (! $post ->save()) throw new Exception( "Error Processing Request" , 1); $dbTrans ->commit(); // $this->_end(0,'添加成功!!!'); } catch (Exception $e ){ $dbTrans ->rollback(); // $this->_end($e->getCode(),$e->getMessage()); }转载于:https://www.cnblogs.com/yyp520thy/p/7878017.html
