YII数据库增删查改操作

 1 //1.该方法是根据一个条件查询一个集合
 2 $admin=Admin::model()->findAll($condition,$params);
 3 $admin=Admin::model()->findAll("username=:name",array(":name"=>$username));
 4  
 5 //2. findAllByPk(该方法是根据主键查询一个集合,可以使用多个主键)
 6 $admin=Admin::model()->findAllByPk($postIDs,$condition,$params);
 7 $admin=Admin::model()->findAllByPk($id,"name like :name and age=:age",array(‘:name‘=>$name,‘age‘=>$age));
 8 $admin=Admin::model()->findAllByPk(array(1,2));
 9  
10 //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)
11 $admin=Admin::model()->findAllByAttributes($attributes,$condition,$params);
12 $admin=Admin::model()->findAllByAttributes(array(‘username‘=>‘admin‘));
13  
14 //4.findAllBySql (该方法是根据SQL语句查询一个数组)
15 $admin=Admin::model()->findAllBySql($sql,$params);
16 $admin=Admin::model()->findAllBySql("select * from admin where username like :name",array(‘:name‘=>‘%ad%‘)); 

 1 //根据主键查询出一个对象,如：findByPk(1); 
 2 $admin=Admin::model()->findByPk($postID,$condition,$params); 
 3 $admin=Admin::model()->findByPk(1);
 4  
 5 //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
 6 $row=Admin::model()->find($condition,$params);
 7 $row=Admin::model()->find(‘username=:name‘,array(‘:name‘=>‘admin‘));
 8  
 9 //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
10 $admin=Admin::model()->findByAttributes($attributes,$condition,$params);
11 $admin=Admin::model()->findByAttributes(array(‘username‘=>‘admin‘));
12  
13 //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
14 $admin=Admin::model()->findBySql($sql,$params); 
15 $admin=Admin::model()->findBySql("select * from admin where username=:name",array(‘:name‘=>‘admin‘));
16  
17 //拼一个获得SQL的方法,在根据find查询出一个对象  
18 $criteria=new CDbCriteria;  
19 $criteria->select=‘username‘; // only select the ‘title‘ column  
20 $criteria->condition=‘username=:username‘; 
21 $criteria->params=array(":username=>‘admin‘"); 
22 $criteria->order = "id DESC";
23 $criteria->limit = "3";
24 $post=Post::model()->find($criteria); // $params isnot needed  

 1 //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
 2 $n=Post::model()->count($condition,$params); 
 3 $n=Post::model()->count("username=:name",array(":name"=>$username));
 4  
 5 //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
 6 $n=Post::model()->countBySql($sql,$params);
 7 $n=Post::model()->countBySql("select * from admin where username=:name",array(‘:name‘=>‘admin‘));
 8  
 9 //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
10 $exists=Post::model()->exists($condition,$params);
11 $exists=Post::model()->exists("name=:name",array(":name"=>$username));

1 $admin = new Admin;        
2 $admin->username = $username; 
3 $admin->password = $password; 
4 if($admin->save() > 0){ echo "添加成功"; }else{ echo "添加失败"; }

 1 Post::model()->updateAll($attributes,$condition,$params); 
 2 $count =Admin::model()->updateAll(array(‘username‘=>‘11111‘,‘password‘=>‘11111‘),‘password=:pass‘,array(‘:pass‘=>‘1111a1‘)); 
 3 if($count > 0){ echo "修改成功"; }else{ echo "修改失败"; }
 4  
 5 //$pk主键,可以是一个也可以是一个集合,$attributes是要修改的字段的集合,$condition条件,$params传入的值 
 6 Post::model()->updateByPk($pk,$attributes,$condition,$params); 
 7 $count =Admin::model()->updateByPk(1,array(‘username‘=>‘admin‘,‘password‘=>‘admin‘)); 
 8 $count =Admin::model()->updateByPk(array(1,2),array(‘username‘=>‘admin‘,‘password‘=>‘admin‘),‘username=:name‘,array(‘:name‘=>‘admin‘)); 
 9 if($count>0){ echo "修改成功"; }else{ echo "修改失败"; }
10  
11 Post::model()->updateCounters($counters,$condition,$params); 
12 $count=Admin::model()->updateCounters(array(‘status‘=>1),‘username=:name‘,array(‘:name‘=>‘admin‘)); 
13 if($count > 0){ echo "修改成功"; }else{ echo "修改失败"; }
14 //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 

 1 //deleteAll
 2 Post::model()->deleteAll($condition,$params); 
 3 $count = Admin::model()->deleteAll(‘username=:name and password=:pass‘,array(‘:name‘=>‘admin‘,‘:pass‘=>‘admin‘)); 
 4 $count = Admin::model()->deleteAll(‘id in("1,2,3")‘);//删除id为这些的数据 
 5 if($count>0){echo "删除成功"; }else{ echo "删除失败"; }
 6  
 7 //deleteByPk
 8 Post::model()->deleteByPk($pk,$condition,$params); 
 9 $count = Admin::model()->deleteByPk(1); 
10 $count =Admin::model()->deleteByPk(array(1,2),‘username=:name‘,array(‘:name‘=>‘admin‘)); 
11 if($count>0){ echo "删除成功"; }else{ echo "删除失败"; }