//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));

 //2. 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%')); 

 //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  

 //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));

 $admin = new Admin;

 $admin->username = $username;

 $admin->password = $password;

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

 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 

 //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"; }