yii Yii 框架裡資料庫操作詳解-[增加、查詢、更新、刪除的方法
阿新 • • 發佈:2019-02-20
======================================= 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 一般寫法: $criteria = new CDbCriteria; $count = DnOnline::model()->count($criteria); $pages = new CPagination($count); $pages->pageSize = 5; $pages->applylimit($criteria); $model = DnOnline::model()->findAll($criteria); 記得控制器裡有個函式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(); ======================================== 一、查詢資料集合 1、$admin=Admin::model()->findAll ($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)); 2、$admin=Admin::model()->findAllByPk($postIDs,$condition,$params); findAllByPk($id,"name like ':name' and age=:age",array(':name'=>$name,'age'=>$age)); 該方法是根據主鍵查詢一個集合,可以使用多個主鍵,如: findAllByPk(array(1,2)); 3、$admin=Admin::model()->findAllByAttributes($attributes,$condition,$params); 該方法是根據條件查詢一個集合,可以是多個條件,把條件放到數組裡面,如: findAllByAttributes(array('username'=>'admin')); 4、$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')); ======================================== 二、查詢對像 的方法 1、$admin=Admin::model()->findByPk ($postID,$condition,$params); 根據主鍵查詢出一個物件,如:findByPk(1); 2、$row=Admin::model()->find ($condition,$params); 根據一個條件查詢出一組資料,可能是多個,但是他只返回第一行資料,如: find('username=:name',array(':name'=>'admin')); $userinfo=Userinfo::model()->find(array('condition'=>'user_id=:user_id','params'=>array(':user_id'=>$uid))); print_r($userinfo->user_id); 3、$admin=Admin::model()->findByAttributes ($attributes,$condition,$params); 該方法是根據條件查詢一組資料,可以是多個條件,把條件放到數組裡面,他查詢的也是第一條資料,如: findByAttributes(array('username'=>'admin')); 4、$admin=Admin::model()->findBySql ($sql,$params); 該方法是根據SQL語句查詢一組資料,他查詢的也是第一條資料,如: findBySql("select *from admin whereusername=:name",array(':name'=>'admin')); 5、拼一個獲得SQL的方法,在根據find查詢出一個物件 $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); // $params isnot needed ======================================== 三、查詢個數,判斷查詢是否有結果 1、$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"=>$username)); 2、$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')); 3、$exists=Post::model()->exists($condition,$params); 該方法是根據一個條件查詢查詢得到的陣列有沒有資料,如果有資料返回一個true,否則沒有找到 $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; ======================================== 四、新增的方法 $admin=newAdmin; $admin->username=$username; $admin->password=$password; if($admin->save ()>0){ echo "新增成功"; }else{ echo "新增失敗"; } $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 "修改失敗"; } $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 "修改失敗"; } $pk代表主鍵,可以是一個也可以是一個集合,$attributes代表是要修改的欄位的集合,$condition代表條件,$params傳入的值 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 "修改失敗"; } array('status'=>1)代表資料庫中的admin表根據條件username='admin',查詢出的所有結果status欄位都自加1 ======================================== 六、刪除的方法 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.")');刪除id為這些的資料 if($count>0){ echo "刪除成功"; }else{ echo "刪除失敗"; } 2、Post::model()->deleteByPk($pk,$condition,$params); $count = Admin::model()->deleteByPk(1); $count =Admin::model()->deleteByPk(array(1,2),'username=:name',array(':name'=>'admin')); if($count>0){ echo "刪除成功"; }else{ echo "刪除失敗"; }