yii有个查询数据的便利的地方，就是可以在model层设置查询规则，然后在controller层，直接调用，进行数据查询：
举个例子说明一下：
先从model层说起：model名称叫做Blog，继承自CActiveRecord
function scopes()
{
return [
'published' => [
'condition' => 'status=1',
],
'recently' => [
'order' => 'create_date DESC',
'limit' => 5,
],
'createDateDesc' => [
'order' => 'create_date DESC',
],
];
}
在上面的代码中，继承函数scopes,然后在里面命名自己想要使用的规则名称。
我这里使用了
published，recently，createCateDesc，分别对应sql语句的一部分，这个在调用controller的时候会合并到总的sql语句里面去的。
下面看在controller里面怎么使用
//最近的博文
$rawData = Blog::model()->recently()->findAll();
$rawData = new CArrayDataProvider($rawData, [
'sort' => [
'attributes' => [
'id',
'title',
],
],
'pagination' => [
'pageSize' => 10,
],
]);
我在自己的BlogController控制器，action为actionView的方法中引用了这样一个代码：
注意其中的recently部分
$rawData=Blog::model()->recently()->findAll();
这个就是我们在model层设置的规则，在这里作为方法被调用了。
是不是很方便呀。
详细的代码我贴到下面：
<?php
/**
* This is the model class for table "tbl_blog".
*
* The followings are the available columns in table 'tbl_blog':
* @property integer $id
* @property string $title
* @property string $description
* @property string $create_date
* @property string $update_date
*/
class Blog extends CActiveRecord
{
/**
* Returns the static model of the specified AR class.
* @param string $className active record class name.
* @return Blog the static model class
*/
public static function model($className = __CLASS__)
{
return parent::model($className);
}
/**
* @return string the associated database table name
*/
public function tableName()
{
return 'tbl_blog';
}
/**
* @return array validation rules for model attributes.
*/
public function rules()
{
// NOTE: you should only define rules for those attributes that
// will receive user inputs.
return [
['title', 'required', 'message' => '标题不能为空'],
['description', 'required', 'message' => '内容不能为空'],
['title', 'length', 'max' => 255],
['tag', 'safe'],
['type_id', 'safe'],
['update_date', 'safe'],
// The following rule is used by search().
// Please remove those attributes that should not be searched.
['id, title, description, create_date, update_date', 'safe', 'on' => 'search'],
];
}
/**
* @return array relational rules.
*/
public function relations()
{
// NOTE: you may need to adjust the relation name and the related
// class name for the relations automatically generated below.
return [
];
}
/**
* @return array customized attribute labels (name=>label)
*/
public function attributeLabels()
{
return [
'id' => 'ID序号',
'title' => '标题',
'description' => '内容',
'tag' => '标签(使用逗号进行分割)',
'type_id' => '分类类型',
'create_date' => '创建时间',
'update_date' => '更新时间',
];
}
/**
* Retrieves a list of models based on the current search/filter conditions.
* @return CActiveDataProvider the data provider that can return the models based on the search/filter conditions.
*/
public function search()
{
// Warning: Please modify the following code to remove attributes that
// should not be searched.
$criteria = new CDbCriteria();
$criteria->compare('id', $this->id);
$criteria->compare('title', $this->title, true);
$criteria->compare('description', $this->description, true);
$criteria->compare('create_date', $this->create_date, true);
$criteria->compare('update_date', $this->update_date, true);
$criteria->scopes = 'createDateDesc';
return new CActiveDataProvider($this, [
'criteria' => $criteria,
]);
}
/**
* 行为操作
*/
public function behaviors()
{
return [
'CTimestampBehavior' => [
'class' => 'zii.behaviors.CTimestampBehavior',
'createAttribute' => 'create_date',
'updateAttribute' => 'update_date',
'setUpdateOnCreate' => 'true',
],
];
}
//查询范围
public function scopes()
{
return [
'published' => [
'condition' => 'status=1',
],
'recently' => [
'order' => 'create_date DESC',
'limit' => 5,
],
'createDateDesc' => [
'order' => 'create_date DESC',
],
];
}
}
<?php
class BlogController extends Controller
{
/**
* @var string the default layout for the views. Defaults to '//layouts/column2', meaning
* using two-column layout. See 'protected/views/layouts/column2.php'.
*/
public $layout = '//layouts/column2';
/**
* @return array action filters
*/
public function filters()
{
return [
'accessControl', // perform access control for CRUD operations
'postOnly + delete', // we only allow deletion via POST request
];
}
/**
* Specifies the access control rules.
* This method is used by the 'accessControl' filter.
* @return array access control rules
*/
public function accessRules()
{
return [
['allow', // allow all users to perform 'index' and 'view' actions
'actions' => ['view'],
'users' => ['*'],
],
['allow', // allow authenticated user to perform 'create' and 'update' actions
'actions' => ['create', 'update', 'index'],
'users' => ['@'],
],
['allow', // allow admin user to perform 'admin' and 'delete' actions
'actions' => ['admin', 'delete'],
'user' => ['admin'],
],
['deny', // deny all users
'users' => ['*'],
],
];
}
/**
* Displays a particular model.
* @param integer $id the ID of the model to be displayed
*/
public function actionView($id)
{
//最近的博文
$rawData = Blog::model()->recently()->findAll();
$rawData = new CArrayDataProvider($rawData, [
'sort' => [
'attributes' => [
'id',
'title',
],
],
'pagination' => [
'pageSize' => 10,
],
]);
$recentBlogMenu = [];
foreach ($rawData->getData() as $key => $value) {
$recentBlogMenu[] = [
'label' => $value->title,
'url' => ['blog/view', 'id' => $value->id],
];
}
//博文的分类
$rawData = Type::model()->findAll();
$rawData = new CArrayDataProvider($rawData, [
'sort' => [
'attributes' => [
'id',
'name',
],
],
]);
$blogType = [];
foreach ($rawData->getData() as $key => $value) {
$blogType[] = [
'label' => $value->name,
'url' => ['type/search/' . $value->id],
];
}
$this->render('view', [
'model' => $this->loadModel($id),
'blogType' => $blogType,
'recentBlogMenu' => $recentBlogMenu,
]);
}
/**
* Creates a new model.
* If creation is successful, the browser will be redirected to the 'view' page.
*/
public function actionCreate()
{
$model = new Blog;
// Uncomment the following line if AJAX validation is needed
// $this->performAjaxValidation($model);
if (isset($_POST['Blog'])) {
$model->attributes = $_POST['Blog'];
if ($model->save()) {
$this->redirect(['view', 'id' => $model->id]);
}
}
$rawData = new CActiveDataProvider(
'Type',
[
'sort' => [
'attributes' => [
'id',
'name',
],
],
]
);
foreach ($rawData->getData() as $key => $value) {
$type[$value->id] = $value->name;
}
$this->render('create', [
'model' => $model,
'type' => $type,
]);
}
/**
* Updates a particular model.
* If update is successful, the browser will be redirected to the 'view' page.
* @param integer $id the ID of the model to be updated
*/
public function actionUpdate($id)
{
$model = $this->loadModel($id);
// Uncomment the following line if AJAX validation is needed
// $this->performAjaxValidation($model);
if (isset($_POST['Blog'])) {
$model->attributes = $_POST['Blog'];
if ($model->save()) {
$this->redirect(['view', 'id' => $model->id]);
}
}
$rawData = new CActiveDataProvider(
'Type',
[
'sort' => [
'attributes' => [
'id',
'name',
],
],
]
);
foreach ($rawData->getData() as $key => $value) {
$type[$value->id] = $value->name;
}
$this->render('update', [
'model' => $model,
'type' => $type,
]);
}
/**
* Deletes a particular model.
* If deletion is successful, the browser will be redirected to the 'admin' page.
* @param integer $id the ID of the model to be deleted
*/
public function actionDelete($id)
{
$this->loadModel($id)->delete();
// if AJAX request (triggered by deletion via admin grid view), we should not redirect the browser
if (!isset($_GET['ajax'])) {
$this->redirect(isset($_POST['returnUrl']) ? $_POST['returnUrl'] : ['admin']);
}
}
/**
* Lists all models.
*/
public function actionIndex()
{
$dataProvider = new CActiveDataProvider(
'Blog',
[
'pagination' => ['pageSize' => 10],
'criteria' => [
'order' => 'create_date DESC',
],
]
);
$this->render('index', [
'dataProvider' => $dataProvider,
]);
}
/**
* Manages all models.
*/
public function actionAdmin()
{
$model = new Blog('search');
$model->unsetAttributes(); // clear any default values
if (isset($_GET['Blog'])) {
$model->attributes = $_GET['Blog'];
}
$this->render('admin', [
'model' => $model,
]);
}
/**
* Returns the data model based on the primary key given in the GET variable.
* If the data model is not found, an HTTP exception will be raised.
* @param integer the ID of the model to be loaded
*/
public function loadModel($id)
{
$model = Blog::model()->findByPk($id);
if (null === $model) {
throw new CHttpException(404, '请求的页面不存在.');
}
return $model;
}
/**
* Performs the AJAX validation.
* @param CModel the model to be validated
*/
protected function performAjaxValidation($model)
{
if (isset($_POST['ajax']) && 'blog-form' === $_POST['ajax']) {
echo CActiveForm::validate($model);
Yii::app()->end();
}
}
}