Yii Ar model 查询

Ar model 查询


参照表：
CREATE TABLE tbl_user
(
    id INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
    username VARCHAR(128) NOT NULL,
    password VARCHAR(128) NOT NULL,
    email VARCHAR(128) NOT NULL,
    profile TEXT
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE tbl_post
(
    id INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
    title VARCHAR(128) NOT NULL,
    content TEXT NOT NULL,
    tags TEXT,
    status INTEGER NOT NULL,
    create_time INTEGER,
    update_time INTEGER,
    author_id INTEGER NOT NULL,
    CONSTRAINT FK_post_author FOREIGN KEY (author_id)
        REFERENCES tbl_user (id) ON DELETE CASCADE ON UPDATE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;


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

一、单行所有列查询
① $post = Post::model()->find($condition,$params);

②
$post = Post::model()->findByPk($postID,$condition,$params);

③
$post = Post::model()->findByAttributes($attributes,$condition,$params);
例如：Post::model()->findByAttributes(array('title'=>'abc'))

④
$post = Post::model()->findBySql($sql,$params);

二、单行选择列查询
①
$criteria = new CDbCriteria;
$criteria->select = 'title';  //现在所需要的列
$criteria->condition = 'postID=:postID';
$criteria->params = array(':postID'=>10);
$post = Post::model()->find($criteria);
②
$post=Post::model()->find(array(
'select'    => 'title',    
'condition'    => 'postID=:postID',    
'params'    => array(':postID'=>10),
)); 

三、多行所有列查询
①
$post = Post::model()->findAll($condition,$params)
②
$post = Post::model()->findAllByPk($postIDs,$condition,$params); 
③
$post = Post::model()->findAllByAttributes($attributes,$condition,$params); 
④
$post = Post::model()->findAllBySql($sql,$params); 

四、多行选择列（参照与单行选择列查询）

五、查询行数
$count = Post::model()->count($condition,$params)

六、
$exists=Post::model()->exists($condition,$params)

七、联合查询
关系：
BELONGS_TO： A和B的关系是一对多，那么B属于A 例如：Post属于User

HAS_MANY：A和B之间的关系是一对多，那么A有多个B 例如：User有多个Post
HAS_ONE： 这是HAS_MANY的一种特殊情况，A至多有一个B  
MANY_MANY： 这个对应多对多的情况，在AR里会将多对多以BELONGS_TO和HAS_MANY的组合来解释
例如：
'VarName'=>array('RelationType','ClassName','ForeignKey', ...additional options)
class User extends CActiveRecord {
    public function relations() {
        return array(
            'posts'=>array(
                self::HAS_MANY,
                'Post',
                'authorID'，
                'order'=>'posts.create_time DESC',
            ),
            'profile'=>array(
                self::HAS_ONE,
                'Profile',
                'ownerID'
            ),
        );
    }
}

User::model()->with('posts')->findAll();
User::model()->with(array(‘posts, profile’))->findAll();

八、增改删除

① 单条记录操作
$now = time();
$model = new CBlocks();  
$model = $model->findByPk($id);（更改）             
$request = Yii::app()->request;
$blockName = $request->getPost('block_name');               
$model->setAttribute('block_name',$blockName); 
（或者 $model-> block_name = $blockName; 直接调用公共成员变量）
$model->setAttribute('expired_time', $request->getPost('expired_time'));
$model->setAttribute('create_time', $now);
$model->setAttribute('update_time', $now);
$model->save()

或者：$model->setAttributes($_REQUEST);

修改：CBlocks::model()->updateByPk($pk,$attributes,$condition,$params);

CBlocks()::model()->findByPk($id) ->delete();
或者：CBlocks::model()->deleteByPk($pk,$condition,$params);

② 多条记录操作

Post::model()->updateAll($attributes,$condition,$params);
Post::model()->deleteAll($condition,$params);



Pdo  model 查询

一、关联查询
$joinTableName = $nlogNews->tableName();
$connection = Yii::app()->db->createCommand();  
                $selectObj = $connection->select("a.contentid,a.title")
                        ->from($this->tableName().' a')
                        ->join("$joinTableName b", "a.contentid = b.contentid")
                        ->where("day = :day", array(':day' => date('Ymd')));
                 
                if (! empty($catid) ) {
                    $selectObj->andWhere('catid = :catid', array(':catid' => $catid));
                }
                
                $return = $selectObj->order("hit DESC")
                        ->limit($limit)                      
                        ->queryAll();
单行：
$selectObj->queryRow ();

单列：
$selectObj->queryColumn ();