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HomeBackend DevelopmentPHP Tutorialyii的CURD操作实例详解_php实例

本文实例讲述了yii的CURD操作技巧。分享给大家供大家参考。具体分析如下:

CURD是一个数据库技术中的缩写词,一般的项目开发的各种参数的基本功能都是CURD。它代表创建(Create)、更新(Update)、读取(Retrieve)和删除(Delete)操作。本文来讲讲Yii框架的CURD操作。

一、查询数据集合

1、

复制代码 代码如下:
$admin=Admin::model()->findAll($condition,$params);
该方法是根据一个 条件查询一个集合,如:
复制代码 代码如下:
findAll('username=:name',array(':name'=>$username));

2、

复制代码 代码如下:
$admin=Admin::model()->findAllByPk($postIDs,$condition,$params);

findAllByPk($id,'name like ':name' and age=:age',array(':name'=>$name,'age'=>$age));

该方法是根据主键查询一个集合,可以使用多个主键,如:
复制代码 代码如下:
findAllByPk(array(1,2));

3、

复制代码 代码如下:
$admin=Admin::model()-> findAllByAttributes($attributes,$condition,$params);
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,如:
复制代码 代码如下:
findAllByAttributes(array('username'=>'admin'));

4、

复制代码 代码如下:
$admin=Admin::model()->findAllBySql($sql,$params);
该方法是根据SQL语句查询一个数组,如:
复制代码 代码如下:
findAllBySql('select *from admin whereusername=:name',array(':name'=>'admin'));

二、查询对像的方法

1、

复制代码 代码如下:
$admin=Admin::model()->findByPk($postID,$condition,$params);
根据主键查询出一个对象,如:findByPk(1);

2、

复制代码 代码如下:
$row=Admin::model()->find($condition,$params);
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,如:
复制代码 代码如下:
find('username=:name',array(':name'=>'admin'));

3、

复制代码 代码如下:
$admin=Admin::model()-> findByAttributes($attributes,$condition,$params);
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,他查询的也是第一条数据,如:
复制代码 代码如下:
findByAttributes(array('username'=>'admin'));

4、

复制代码 代码如下:
$admin=Admin::model()->findBySql($sql,$params);
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,如:
复制代码 代码如下:
findBySql('select *from admin whereusername=:name',array(':name'=>'admin'));

5、拼一个获得SQL的方法,在根据find查询出一个对象

复制代码 代码如下:
$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、查询个数,判断查询是否有结果

1、

复制代码 代码如下:
$n=Post::model()->count($condition,$params);
该方法是根据一个条件查询一个集合有多少条记录,返回一个int型数字,如
复制代码 代码如下:
count('username=:name',array(':name'=>$username));

2、

复制代码 代码如下:
$n=Post::model()->countBySql($sql,$params);
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,如
复制代码 代码如下:
countBySql('select *from admin whereusername=:name',array(':name'=>'admin'));

3、

复制代码 代码如下:
$exists=Post::model()->exists($condition,$params);
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

四、添加的方法

复制代码 代码如下:
$admin=newAdmin;
$admin->username=$username;
$admin->password=$password;
if($admin->save()>0){
echo '添加成功';
}else{
echo '添加失败';
}

五、修改的方法

1、

复制代码 代码如下:
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';
}

2、

复制代码 代码如下:
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';
}

$pk 代表主键,可以是一个也可以是一个集合,$attributes代表是要修改的字段的集合,$condition代表条件,$params传入的值

3、

复制代码 代码如下:
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'=& gt;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

六、删除的方法

1、

复制代码 代码如下:
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.')');删除id为这些的数据
if($count>0){
echo '删除成功';
}else{
echo '删除失败';
}

2、

复制代码 代码如下:
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';
}

希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。

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