Yii 框架里数据库操作详解-[增加、查询、更新、删除的方法 'AR模式'

 

=======================================

    public function getMinLimit () {

        $sql = "...";

        $result = yii::app()->db->createCommand($sql);

        $query = $result->queryAll();

        return array (

                $query [0] ['max'],

        );

    }

 

 

 

$connection=Yii::app()->db;

$sql="SELECT u.account,i.* FROM sys_user as u left join user_info as i on u.id=i.user_id";

$rows=$connection->createCommand

($sql)->query();

foreach ($rows as $k => $v ){

    echo $v['add_time'];

}

 

 

======================================== 事务

$db = Yii::app()->db;

$dbTrans = $db->beginTransaction();

$dbTrans->commit();

$dbTrans->rollback();

 

 

 

========================================  分页

 

一般写法：

$criteria = new CDbCriteria;

$count = DnOnline::model()->count($criteria);

$pages = new CPagination($count);              

$pages->pageSize = 5;

$pages->applylimit($criteria);

$model = DnOnline::model()->findAll($criteria);

记得控制器里有个函数paginate($itemCount,$pageSize=null,$pageVar=null)

CDB写法：

$criteria = new CDbCriteria;

$sql = "SELECT * FROM USER";

$model= Yii::app()->db->createCommand($sql)->queryAll();

$pages = new CPagination(count($model));              

$pages->pageSize = 4;

$pages->applylimit($criteria);

$model=Yii::app()->db->createCommand($sql." LIMIT :offset,:limit");

$model->bindValue(':offset', $pages->currentPage*$pages->pageSize);

$model->bindValue(':limit', $pages->pageSize);

$model=$model->queryAll();

或者:

      $criteria = new CDbCriteria;

      $connection=Yii::app()->db;

      $sql="SELECT u.account,i.* FROM sys_user as u left join user_info as i on u.id=i.user_id ";

      $model= Yii::app()->db->createCommand($sql)->queryAll();

      $pages = new CPagination(count($model));              

      $pages->pageSize = 4;

      $pages->applylimit($criteria);

      $model=Yii::app()->db->createCommand($sql." LIMIT :offset,:limit");

      $model->bindValue(':offset', $pages->currentPage*$pages->pageSize);

      $model->bindValue(':limit', $pages->pageSize);

      $model=$model->queryAll();

 

 

======================================== 一、查询数据集合



1、$admin=Admin::model()->findAll

($condition,$params);

该方法是根据一个条件查询一个集合，如： 

findAll("username=:name",array(":name"=>$username));    

2、$admin=Admin::model()->findAllByPk($postIDs,$condition,$params);

findAllByPk($id,"name like ':name' and age=:age",array(':name'=>$name,'age'=>$age));   

该方法是根据主键查询一个集合，可以使用多个主键,如： 

findAllByPk(array(1,2));   

3、$admin=Admin::model()->findAllByAttributes($attributes,$condition,$params);

该方法是根据条件查询一个集合，可以是多个条件，把条件放到数组里面，如： 

findAllByAttributes(array('username'=>'admin'));

4、$admin=Admin::model()->findAllBySql($sql,$params);

该方法是根据SQL语句查询一个数组,如：

findAllBySql("select *from admin whereusername=:name",array(':name'=>'admin'));

========================================  二、查询对像

的方法 

1、$admin=Admin::model()->findByPk

($postID,$condition,$params);

 根据主键查询出一个对象,如：findByPk(1); 

 

 

 

 

 2、$row=Admin::model()->find

($condition,$params);

 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,如：

find('username=
4000
:name',array(':name'=>'admin'));

 

      $userinfo=Userinfo::model()->find(array('condition'=>'user_id=:user_id','params'=>array(':user_id'=>$uid)));

      print_r($userinfo->user_id);

 

 

 3、$admin=Admin::model()->findByAttributes

($attributes,$condition,$params);

 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，他查询的也是第一条数据，如：

findByAttributes(array('username'=>'admin'));

 4、$admin=Admin::model()->findBySql

($sql,$params);

 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，如： 

findBySql("select *from admin whereusername=:name",array(':name'=>'admin'));

 5、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');

$post=Post::model()->find($criteria);

// $params isnot needed 

 

========================================  三、查询个数，判断查询是否有结果 

1、$n=Post::model()->count
($condition,$params);

 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,如 

count("username=:name",array(":name"=>$username));   

 2、$n=Post::model()->countBySql
($sql,$params);

 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,如

countBySql("select *from admin whereusername=:name",array(':name'=>'admin'));

 3、$exists=Post::model()->exists($condition,$params);

 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

 

 

 

        $sql = "select count(*) as count  from " . $this->tableName() . " where user_id = $userId";

        $query = $result->queryAll();

        $pageSize =10;

        $count = $query [0] ['count'];

        $pageCount = ceil($count / $pageSize);

        return $pageCount;

======================================== 四、添加的方法 

$admin=newAdmin;       

$admin->username=$username;

$admin->password=$password;

if($admin->save

()>0){

   echo "添加成功"; 

}else{ 

   echo "添加失败"; 

}

 

 

 

$userLimit = new UserLimit();

$userLimit->item = 0.30000;

if($userLimit->insert

(){

 

}

======================================== 五、修改的方法 

 

$userLimitRet = UserLimit::model()->findByPk

(array (

                                'user_id' => $userId,

                                'category_id' => $v

                        ));

$userLimitRet->order = $order;

if (! $userLimitRet->update

()) {

}

 

 

 

 

 

$userAmount=userAmount::model()->findByPk

($userId);

$userAmount->credit=Yii::app()->request->getParam('credit',10000);

$ret = $userAmount->save

();

 

 

 

1、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"; 

} 

 

 

 

 

 

$ret = $this->updateAll

(array (

                                'set' => $Set

                        ), " user_id in ( " . $userIds . " )

and category_id = " . $categoryId);

if($ret){

    return true;

}else {

    return false;

}

 

 

 2、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"; 

} 

$pk代表主键，可以是一个也可以是一个集合，$attributes代表是要修改的字段的集合，$condition代表条件，$params传入的值

 3、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、Post::model()->deleteAll($condition,$params);

 $count = Admin::model()->deleteAll('username=:nameandpassword=:pass',array(':name'=>'admin',':pass'=>'admin'));

         $id=1,2,3 

         deleteAll('id in(".$id.")');删除id为这些的数据

if($count>0){ 

   echo "删除成功"; 

}else{ 

   echo "删除失败"; 

} 

 2、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"; 

}