yii 數據庫操做

    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'];
}

 

 

======================================== 事務

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

$dbTrans->commit();
$dbTrans->rollback();

 

 

 

========================================  分頁

 

通常寫法：
$criteria = new CDbCriteria;
$count = DnOnline::model()->count($criteria);
$pages = new CPagination($count);              
$pages->pageSize = 5;
$pages->applylimit($criteria);
$model = DnOnline::model()->findAll($criteria);

記得控制器裏有個函數paginate($itemCount,$pageSize=null,$pageVar=null)
CDB寫法：

$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();

 

 

======================================== 1、查詢數據集合

一、$admin=Admin::model()->findAll ($condition,$params);
該方法是根據一個條件查詢一個集合，如： 
findAll("username=:name",array(":name"=>$username));    

二、$admin=Admin::model()->findAllByPk($postIDs,$condition,$params);
findAllByPk($id,"name like ':name' and age=:age",array(':name'=>$name,'age'=>$age));   
該方法是根據主鍵查詢一個集合，可使用多個主鍵,如： 
findAllByPk(array(1,2));   

三、$admin=Admin::model()->findAllByAttributes($attributes,$condition,$params);
該方法是根據條件查詢一個集合，能夠是多個條件，把條件放到數組裏面，如： 
findAllByAttributes(array('username'=>'admin'));

四、$admin=Admin::model()->findAllBySql($sql,$params);
該方法是根據SQL語句查詢一個數組,如：
findAllBySql("select *from admin whereusername=:name",array(':name'=>'admin'));

========================================  2、查詢對像 的方法 

一、$admin=Admin::model()->findByPk ($postID,$condition,$params);
 根據主鍵查詢出一個對象,如：findByPk(1); 

 

 

 

 

 二、$row=Admin::model()->find ($condition,$params);
 根據一個條件查詢出一組數據，多是多個，可是他只返回第一行數據,如：
find('username=:name',array(':name'=>'admin'));

 

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

 

 

 三、$admin=Admin::model()->findByAttributes ($attributes,$condition,$params);
 該方法是根據條件查詢一組數據，能夠是多個條件，把條件放到數組裏面，他查詢的也是第一條數據，如：
findByAttributes(array('username'=>'admin'));

 四、$admin=Admin::model()->findBySql ($sql,$params);
 該方法是根據SQL語句查詢一組數據,他查詢的也是第一條數據，如： 
findBySql("select *from admin whereusername=:name",array(':name'=>'admin'));

 五、拼一個得到SQL的方法，在根據find查詢出一個對象 

$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 
 
========================================  3、查詢個數，判斷查詢是否有結果 

一、$n=Post::model()->count ($condition,$params);
 該方法是根據一個條件查詢一個集合有多少條記錄，返回一個int型數字,如 
count("username=:name",array(":name"=>$username));   

 二、$n=Post::model()->countBySql ($sql,$params);
 該方法是根據SQL語句查詢一個集合有多少條記錄，返回一個int型數字,如
countBySql("select *from admin whereusername=:name",array(':name'=>'admin'));

 三、$exists=Post::model()->exists($condition,$params);
 該方法是根據一個條件查詢查詢獲得的數組有沒有數據，若是有數據返回一個true，不然沒有找到

 

 

 

        $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;

======================================== 4、添加的方法 
$admin=newAdmin;       
$admin->username=$username;
$admin->password=$password;
if($admin->save ()>0){
   echo "添加成功"; 
}else{ 
   echo "添加失敗"; 
}

 

 

 

$userLimit = new UserLimit();
$userLimit->item = 0.30000;
if($userLimit->insert (){

 

}

======================================== 5、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 ();

 

 

 

一、Post::model()->updateAll ($attributes,$condition,$params);
 $count =Admin::model()->updateAll(array('username'=>'11111','password'=>'11111'),'password=:pass',array(':pass'=>'1111a1'));
if($count>0){ 
   echo "修改爲功"; 
}else{ 
   echo "修改失敗"; 
} 

 

 

 

 

 

$ret = $this->updateAll (array (
                                'set' => $Set
                        ), " user_id in ( " . $userIds . " ) and category_id = " . $categoryId);

if($ret){
    return true;
}else {
    return false;
}

 

 

 二、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 "修改爲功"; 
}else{ 
   echo "修改失敗"; 
} 
$pk表明主鍵，能夠是一個也能夠是一個集合，$attributes表明是要修改的字段的集合，$condition表明條件，$params傳入的值

 三、Post::model()->updateCounters ($counters,$condition,$params);
 $count=Admin::model()->updateCounters(array('status'=>1),'username=:name',array(':name'=>'admin'));
if($count>0){ 
   echo "修改爲功"; 
}else{ 
   echo "修改失敗"; 
} 
array('status'=>1)表明數據庫中的admin表根據條件username='admin'，查詢出的全部結果status字段都自加1
 
======================================== 6、刪除的方法 一、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.")');刪除id爲這些的數據if($count>0){    echo "刪除成功"; }else{    echo "刪除失敗"; }  二、Post::model()->deleteByPk($pk,$condition,$params);$count = Admin::model()->deleteByPk(1);$count =Admin::model()->deleteByPk(array(1,2),'username=:name',array(':name'=>'admin'));if($count>0){    echo "刪除成功"; }else{    echo "刪除失敗"; }