Yii框架的增删改查总结分析

一、查询数据

1、findAll(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 ");

2、findAllByPk(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(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(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%'));

5、findByPk(根据主键查询出一个对象)

$admin=Admin::model()->findByPk($postID,$condition,$params);

$admin=Admin::model()->findByPk(1);

6、find(根据一个条件查询出一组数据,可能是多个,只返回第一行数据)

$row=Admin::model()->find($condition,$params);

$row=Admin::model()->find('username=:name',array(':name'=>'admin'));

7、findByAttributes(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,查询第一条数据)

$admin=Admin::model()->findByAttributes($attributes,$condition,$params);

$admin=Admin::model()->findByAttributes(array('username'=>'admin'));

8、findBySql(根据SQL语句查询一组数据,查询第一条数据)

$admin=Admin::model()->findBySql($sql,$params);

$admin=Admin::model()->findBySql("select * from admin where username=:name",array(':name'=>'admin'));

9、count(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)

$count=Post::model()->count($condition,$params);

$count=Post::model()->count("username=:name",array(":name"=>$username));

10、countBySql(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)

$count=Post::model()->countBySql($sql,$params);

$count=Post::model()->countBySql("select * from admin where username=:name",array(':name'=>'admin'));

11、exists(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));

二、添加数据

save(添加数据)

$admin=new Admin;       

$admin->username =$username;

$admin->password =$password;

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

三、修改数据

update($pk主键,可以是一个也可以是一个集合,$attributes是要修改的字段的集合,$condition条件,$params传入的值)

Post::model()->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"; }

$result=PostList::model()->updateAll(array('status'=>'1'),'staff_id=:staff and host_id=:host',array(':staff'=>$staff_id,':host'=>$host_id))

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

四、删除数据

delete

Post::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"; }

五、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($rows as $k => $v){

    echo$v['add_time'];

}

六、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());

}