Yii 框架里数据库操作详解

增：
1 第一种

$post = new Post;

$post ->title= 'sample post' ;

$post ->content= 'content for the sample post' ;

$post ->createTime=time();/ $post ->createTime= new CDbexpression_r( 'NOW()' );

$post ->save();

 

$user_field_data = new user_field_data;

$user_field_data ->flag=0;

$user_field_data ->user_id= $profile ->id;

$user_field_data ->field_id= $_POST [ 'emailhiden' ];

$user_field_data ->value1= $_POST [ 'email' ];

$user_field_data ->save();
注当一个表存储4次的时候，需要创建4个handle new4次

2 第二种

存储后我们需要找到这条记录的流水id 这样做 $profile = new profile; $profile->id;

3 第三种

用于更加安全的方法，来绑定变量类型 这样可以在同一个表中存储两个记录

$sql = "insert into user_field_data(user_id,field_id,flag,value1) values(:user_id,:field_id,:flag,:value1);" ;

$command =user_field_data::model()->dbConnection->createCommand( $sql );

$command ->bindParam( ":user_id" , $profile ->id,PDO::PARAM_INT);

$command ->bindParam( ":field_id" , $_POST [ 'firstnamehiden' ],PDO::PARAM_INT);

$command ->bindParam( ":flag" , $tmpflag ,PDO::PARAM_INT);

$command ->bindParam( ":value1" , $_POST [ 'firstname' ],PDO::PARAM_STR);

$command ->execute();

$command ->bindParam( ":user_id" , $profile ->id,PDO::PARAM_INT);

$command ->bindParam( ":field_id" , $_POST [ 'emailhiden' ],PDO::PARAM_INT);

$command ->bindParam( ":flag" , $tmpflag ,PDO::PARAM_INT);

$command ->bindParam( ":value1" , $_POST [ 'email' ],PDO::PARAM_STR);

$rowchange = $command ->execute();

 

if ( $rowchange != 0){ 修改成功 } // 用来判断

//注：update delete都可以用这个方法

$sql = "delete from profile where id=:id" ;

$command =profile::model()->dbConnection->createCommand( $sql );

$command ->bindParam( ":id" , $userid ,PDO::PARAM_INT);

$this ->rowflag= $command ->execute();

 

$sql = "update profile set pass=:pass,role=:role where id=:id" ;

$command =profile::model()->dbConnection->createCommand( $sql );

$command ->bindParam( ":pass" , $password ,PDO::PARAM_STR);

$command ->bindParam( ":role" , $role ,PDO::PARAM_INT);

$command ->bindParam( ":id" , $userid ,PDO::PARAM_INT);

$this ->rowflag= $command ->execute();

// 同理变更updateAll()模式

$sql = "update user_field_data set flag = :flag where user_id= :user_id and field_id= :field_id " ;

原始sql语句

$criteria = new CDbCriteria;

$criteria ->condition = 'user_id = :user_id and field_id= :field_id' ;

$criteria ->params = array ( ':user_id' => $userid , ':field_id' => $fieldid );

$arrupdate = array ( 'flag' => $flag );

if (user_field_data::model()->updateAll( $arrupdate , $criteria ) != 0)

{

更新成功后。。。

}


4 第四种

更新和存储应用同一个handle 流程：先查询记录是否存在，若存在就更新，不存在就新创建
注：1. 第一次查询的变量，要跟save()前的变量一致。2. 存储时候需要再次 new一下库对象

$user_field_data = user_field_data::model()->findByAttributes(

$attributes = array ( 'user_id' => Yii::app()->user->user_id, 'field_id' => $key ));

if ( $user_field_data !== null)

{

     $user_field_data ->value1 = $value ;

     $user_field_data ->save();

}

else

{

     $user_field_data = new user_field_data;

     $user_field_data ->user_id = Yii::app()->user->user_id;

     $user_field_data ->field_id = $key ;

     $user_field_data ->value1 = $value ;

     $user_field_data ->save();

}

删：

$post=Post::model()->findByPk(10); // assuming there is a post whose ID is 10
$post->delete(); // delete the row from the database table
// delete the rows matching the specified condition
Post::model()->deleteAll($condition,$params);
// delete the rows matching the specified condition and primary key(s)
Post::model()->deleteByPk($pk,$condition,$params);

改：

例子：
$post=Post::model()->findByPk(10);
$post->title=’new post title’;
$post->save(); // save the change to database

// update the rows matching the specified condition
Post::model()->updateAll($attributes,$condition,$params);
例子：或者参考上面例子
$c=new CDbCriteria;
$c->condition=’something=1′;
$c->limit=10;
$a=array(‘name’=>’NewName’);
Post::model()->updateAll($a, $c);

// update the rows matching the specified condition and primary key(s)
Post::model()->updateByPk($pk,$attributes,$condition,$params);
例子
$profile = profile::model()->updateByPk(
Yii::app()->user->user_id,
$attributes = array(‘pass’ => md5($_POST['password']), ‘role’ => 1));

// update counter columns in the rows satisfying the specified conditions
Post::model()->updateCounters($counters,$condition,$params);

查：
注：当项目没查找到整个对象会为空需要这样判定

if ( $rows !== null) 当对象不为空

{

     return true;

} else {

     return false;

}
SELECT，读表时候用到
find（）
第一种find()

// find the first row satisfying the specified condition

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

// 条件查询

$post = Post::model()->find( 'post_id=:post_id AND status=:status' ,

array (

   ':post_id' =>8,

   ':status' => 'active' ,

));
同样的语句，用另种方式表示

$criteria = new CDbCriteria;

$criteria ->select= 'title' ;  // only select the 'title' column

$criteria ->condition= 'postID=:postID' ;

$criteria ->params= array ( ':postID' =>10);

$post =Post::model()->find( $criteria ); // $params is not needed
第二种find()

$post =Post::model()->find( array (

     'select' => 'title' ,

     'condition' => 'postID=:postID' ,

     'params' => array ( ':postID' =>10),

));

// find the row with the specified primary key

$post =Post::model()->findByPk( $postID , $condition , $params );

findByAttributes()
$post=Post::model()->findByAttributes($attributes,$condition,$params);
第一种findByAttributes()

$checkuser = user_field_data::model()->findByAttributes(

     array ( 'user_id' => Yii::app()->user->user_id, 'field_id' => $fieldid ));
第二种findByAttributes()

$checkuser = user_field_data::model()->findByAttributes(

     $attributes = array ( 'user_id' => Yii::app()->user->user_id, 'field_id' => $fieldid ));
第三种当没有conditions时候，不用params

$user_field_data = user_field_data::model()->findAllByAttributes(

     $attributes = array ( 'user_id' => ':user_id' ),

     $condition = "field_id in (:fields)" ,

     $params = array ( ':user_id' => Yii::app()->user->user_id, ':fields' => "$rule->dep_fields" ));


// find the first row using the specified SQL statement
$post=Post::model()->findBySql($sql,$params);
例子
user_field_data::model()->findBySql(“select id from user_field_data where user_id = :user_id and field_id = :field_id “, array(‘:user_id’ => $userid,’:field_id’=>$fieldid));
此时回传的是一个对象

第四种 添加其他条件

$criteria = new CDbCriteria;

$criteria ->select = 'newtime' ; //选择只显示哪几个字段要与库中名字相同，但是不能COUNT(newtime) as name这样写

$criteria ->join = 'LEFT JOIN Post ON Post.id=Date.id' ; //1.先要在relation函数中增加与Post表的关系语句 2.Date::model()->with('post')->findAll($criteria)

$criteria ->group  = 'newtime' ;

$criteria ->limit  = 2; // 都是从0开始，选取几个

$criteria -> offset = 2; // 从哪个偏移量开始

print_r( Date ::model()->findAll( $criteria ));

 

//得到行数目或者其他数目 count

// get the number of rows satisfying the specified condition

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

// get the number of rows using the specified SQL statement

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

// check if there is at least a row satisfying the specified condition

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

 

 

原文转自新浪博客《Yii的增删改查》