Yii2 增删改查(CRUD) 整理

查询数据集合findAll

1.该方法是根据一个条件查询一个集合

$admin=Admin::model()->findAll($condition,$params);$admin=Admin::model()->findAll("username=:name",array(":name"=>$username));$admin=Admin::model()->findAll(“username=:name and age=:age” , array(“:name”=>$name, “age”=>$age));$admin=Admin::model()->findAll(“username like :name and age=:age” , array(“:name”=>$name, “age”=>$age));$infoArr= NewsList::model()->findAll("status = '1' ORDER BY id DESC limit 10 ");

findAllByPk(该方法是根据主键查询一个集合,可以使用多个主键)

$admin=Admin::model()->findAllByPk($postIDs,$condition,$params);$admin=Admin::model()->findAllByPk($id,"name like :name and age=:age",array(':name'=>$name,'age'=>$age));$admin=Admin::model()->findAllByPk(array(1,2));

3.findAllByAttributes (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)

$admin=Admin::model()->findAllByAttributes($attributes,$condition,$params);$admin=Admin::model()->findAllByAttributes(array('username'=>'admin'));

4.findAllBySql (该方法是根据SQL语句查询一个数组)

$admin=Admin::model()->findAllBySql($sql,$params);$admin=Admin::model()->findAllBySql("select * from admin where username like :name",array(':name'=>'%ad%'));

查询对象的方法find

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 $criteria->condition='username=:username';    //请注意,这是一个查询的条件,且只有一个查询条件.多条件用addCondition$criteria->params=array(":username=>'admin'");$criteria->order ="id DESC";$criteria->limit ="3";$post=Post::model()->find($criteria);// $params isnot needed 

多条件查询的语句new CDbCriteria

$criteria=new CDbCriteria;     $criteria->addCondition("id=1");//查询条件，即where id = 1 $criteria->addInCondition('id',array(1,2,3,4,5));//代表where id IN (1,2,3,4,5,); $criteria->addNotInCondition('id',array(1,2,3,4,5));//与上面正好相法，是NOT IN $criteria->addCondition('id=1','OR');//这是OR条件，多个条件的时候，该条件是OR而非AND $criteria->addSearchCondition('name','分类');//搜索条件，其实代表了。。where name like '%分类%' $criteria->addBetweenCondition('id', 1, 4);//between 1 and 4$criteria->compare('id', 1);   //这个方法比较特殊,他会根据你的参数自动处理成addCondition或者addInCondition.$criteria->compare('id',array(1,2,3));  //即如果第二个参数是数组就会调用addInCondition $criteria->select ='id,parentid,name';//代表了要查询的字段，默认select='*'; $criteria->join ='xxx';//连接表 $criteria->with ='xxx';//调用relations  $criteria->limit = 10;   //取1条数据，如果小于0，则不作处理 $criteria->offset = 1;  //两条合并起来，则表示 limit 10 offset 1,或者代表了。limit 1,10 $criteria->order ='xxx DESC,XXX ASC';//排序条件 $criteria->group ='group 条件'; $criteria->having ='having 条件 '; $criteria->distinct = FALSE;//是否唯一查询$re = Admin::model()->findAll($criteria);

查询个数,判断查询是否有结果count

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));

添加的方法save

添加一条数据

$admin=new Admin;       $admin->username =$username;$admin->password =$password;if($admin->save() > 0){echo"添加成功"; }else{echo"添加失败"; }

添加多条数据

$goods=new Goods;Foreach($info_array as $k => $v){    $_goods = clone $goods;    $_goods->goodsname = $v[‘name’];    $_goods->goodsprice = $v[‘price’];    $_goods->save();}

修改的方法update

Post::model()->updateAll($attributes,$condition,$params);$count=Admin::model()->updateAll(array('username'=>'11111','password'=>'11111'),'password=:pass',array(':pass'=>'1111a1'));if($count> 0){echo "修改成功"; }else{echo"修改失败"; }$rt=PostList::model()->updateAll(array('status'=>'1'),'staff_id=:staff and host_id=:host',array(':staff'=>$staff_id,':host'=>$host_id));

$pk主键,可以是一个也可以是一个集合,$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

删除的方法delete

deleteAllPost::model()->deleteAll($condition,$params);$count=Admin::model()->deleteAll('username=:nameandpassword=:pass',array(':name'=>'admin',':pass'=>'admin'));$count= Admin::model()->deleteAll('id in("1,2,3")');//删除id为这些的数据if($count>0){echo"删除成功"; }else{echo"删除失败"; }Post::model()->deleteByPk($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、执行原生的SQL语句方法createCommand

createCommand$sql="SELECT u.account,i.* FROM sys_user as u left join user_info as i on u.id=i.user_id";$rows=Yii::app()->db->createCommand($sql)->query();foreach($rowsas $k => $v){    echo$v['add_time'];}

八、事务的基本结构(多表更新或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());}

转自 这里,感谢原作者xsdxn