PHP development framework Yii Framework tutorial (28) Introduction to Data Provider

CActiveDataProvider 基于ActiveRecord, 它通过AR的 CActiveRecord::findAll方法读取数据库记录，并通过 criteria属性设置查询条件。
如：
$dataProvider=new
CActiveDataProvider('Post', array(
'criteria'=>array(
'condition'=>'status=1',
'order'=>'create_time DESC',
'with'=>array('author'),
),
'pagination'=>array(
'pageSize'=>20,
),
));
// $dataProvider->getData() will return a list of Post objectsCArrayDataProvider
基于数组，其中属性 rawData设置原始数据，一般为数组或者DAO查询结果，如：
$rawData=Yii::app()->db->createCommand
('SELECT * FROM tbl_user')->queryAll();
// or using: $rawData=User::model()->findAll();
$dataProvider=new CArrayDataProvider($rawData, array(
'id'=>'user',
'sort'=>array(
'attributes'=>array(
'id', 'username', 'email',
),
),
'pagination'=>array(
'pageSize'=>10,
),
));
// $dataProvider->getData() will return a list of arrays.CSqlDataProvider
基于SQL查询，通过设置 sql 语句来配置，比如：
$count=Yii::app()->db->createCommand('SELECT COUNT(*) FROM tbl_user')-
>queryScalar();
$sql='SELECT * FROM tbl_user';
$dataProvider=new CSqlDataProvider($sql, array(
'totalItemCount'=>$count,
'sort'=>array(
'attributes'=>array(
'id', 'username', 'email',
),
),
'pagination'=>array(
'pageSize'=>10,
),
));
// $dataProvider->getData() will return a list of arrays.