YII CRUD 例子

    < ? php 
    class PostTest extends CDbTestCase{ 
        public $ fixtures = array ( 
            'posts' = > 'Post' , 
            'tags' = > 'Tag' , 
        ) ; 
        
        public function testFindPost( ) { 
            //调用 find 时，我们使用 $condition 和 $params 指定查询条件。 
            //此处 $condition 可以是 SQL 语句中的 WHERE 字符串，$params 则是一个参数数组， 
            //其中的值应绑定到 $condation 中的占位符。 
            $ post = $ this - > posts( 'post1' ) ; 
            $ fPost = Post: : model( ) - > find( 'id = :id' , array ( ':id' = > $ post - > id) ) ; 
            //SELECT * FROM `tbl_post` `t` WHERE `t`.`id`=1 LIMIT 1 
            
            $ fPost = Post: : model( ) - > find( '?' , array ( $ post - > id) ) ; 
            //SELECT * FROM `tbl_post` `t` WHERE '1' LIMIT 1 
            
            //find返回符合条件的第一条记录，而findAll会返回符合条件的所有行。 
            $ fAllPost = Post: : model( ) - > findAll( 'id = :id' , array ( ':id' = > $ post - > id) ) ; 
            //SELECT * FROM `tbl_post` `t` WHERE id = '1' 
            
            $ fAllPost = Post: : model( ) - > findAll( '?' , array ( $ post - > id) ) ; 
            //SELECT * FROM `tbl_post` `t` WHERE '1' 
            
            $ criteria = new CDbCriteria( ) ; 
            $ criteria - > condition = 'id = :id AND title = :title' ; 
            $ criteria - > params = array ( ':id' = > $ post - > id, ':title' = > $ post - > title) ; 
            $ fPost = Post: : model( ) - > find( $ criteria ) ; 
            //SELECT * FROM `tbl_post` `t` WHERE id = '1' AND title = 'post1' LIMIT 1 
            
            $ fAllPost = Post: : model( ) - > findAll( $ criteria ) ; 
            //SELECT * FROM `tbl_post` `t` WHERE id = '1' AND title = 'post1' 
            
            $ fPost = Post: : model( ) - > findByPk( $ post - > id, 'title = :title' , array ( ':title' = > $ post - > title) ) ; 
            //SELECT * FROM `tbl_post` `t` WHERE `t`.`id`=1 AND (title = 'post1') LIMIT 1 
            
            $ fPost = Post: : model( ) - > findByAttributes( array ( 'id' = > $ post - > id, 'title' = > $ post - > title) ) ; 
            //SELECT * FROM `tbl_post` `t` WHERE `t`.`id`='1' AND `t`.`title`='post1' LIMIT 1 
            
            $ sql = 'SELECT id, title from {{post}} WHERE id = ? AND title = ?' ; //必须设置表前缀 
            $ fPost = Post: : model( ) - > findBySql( $ sql , array ( $ post - > id, $ post - > title) ) ; 
            
            $ sql = 'SELECT id, title from {{post}} WHERE id = :id AND title = :title' ; 
            $ fPost = Post: : model( ) - > findBySql( $ sql , array ( ':id' = > $ post - > id, ':title' = > $ post - > title) ) ; 
            
            //如果没有找到符合条件的行，find返回null，findAll 返回 array()。 
            
        } 
        
        public function testCountPost( ) { 
            $ post = $ this - > posts( 'post1' ) ; 
            
            $ cPost = Post: : model( ) - > count ( '?' , array ( $ post - > title) ) ; 
            //SELECT COUNT(*) FROM `tbl_post` `t` WHERE 'post1' 无意义 
            
            $ cPost = Post: : model( ) - > countByAttributes( array ( 'title' = > $ post - > title, 'content' = > $ post - >content) ) ; 
            //SELECT COUNT(*) FROM `tbl_post` `t` WHERE `t`.`title`='post1' AND `t`.`content`='content1' 
            
            $ sql = "SELECT title from {{post}} WHERE title LIKE '%" . $ post - > title . "%'" ; 
            $ cPost = Post: : model( ) - > countBySql( $ sql ) ; 
            //至少有一条记录符合查询条件 
            $ ePost = Post: : model( ) - > exists( 'id = ?     AND    title = ?' , array ( $ post - > id, $ post - > title) ) ; 
            //SELECT 1 FROM `tbl_post` `t` WHERE id = '1'     AND    title = 'post1' LIMIT 1 
        } 
        
        public function testUpdatePost( ) { 
            $ post = $ this - > posts( 'post1' ) ; 
            $ post - > title = 'update post 1' ; 
            
            if ( $ post - > isNewRecord) { 
                $ post - > create_time = $ post - > update_time = new CDbExpression( 'NOW()' ) ; 
                //UPDATE `tbl_post` SET `id`=1, `title`='update post 1', `content`='content1', `tags`=NULL, `status`=1, `create_time`=NULL, `update_time`=1302161123, `author_id`=1 WHERE `tbl_post`.`id`=1 
            } else { 
                $ post - > update_time = time ( ) ; 
            } 
            
            $ post - > save( ) ; 
            
            
            //updateAll 
            $ sql = "SELECT * FROM {{post}} WHERE title LIKE '%" . "post" . "%'" ; 
            //SELECT * FROM tbl_post WHERE title LIKE '%post%' 
            
            $ post = Post: : model( ) - > findBySql( $ sql ) ; 
            $ post - > updateAll( array ( 'update_time' = > time ( ) ) , 'id <= ?' , array ( '2' ) ) ; 
            //UPDATE `tbl_post` SET `update_time`=1302161123 WHERE id <= '2' 
            
            $ post - > updateByPk( $ post - > id + 2, array ( 'title' = > 'update post 3' ) ) ; 
            $ post - > updateByPk( $ post - > id, array ( 'title' = > 'update post 3' ) , 'id = ?' , array ( '3' ) ) ; 
            
            //updateCounter 更新某个字段的数值，一般是计数器(+/-)。 
            $ tag = $ this - > tags( 'tag1' ) ; 
            $ uTag = Tag: : model( ) - > updateCounters( array ( 'frequency' = > '3' ) , 'id = ?' , array ( '1' ) ) ; 
        } 
        
        public function testDeletePost( ) { 
            $ post = $ this - > posts( 'post1' ) ; 
            $ post - > delete ( ) ; 
            
            
            $ this - > assertEquals( 1, $ post - > id) ; //删除数据库表中的记录，但是post的这个实例还在。 
            $ post2 = Post: : model( ) - > findByPk( $ post - > id) ; 
            $ this - > assertEquals( null , $ post2 ) ; 
            
            //多条记录 
            $ delete = Post: : model( ) - > deleteAll( '(id = ? AND title = ?) || (id = \'4\') ' , array ( 1, 'post 1' ) ) ; 
            $ this - > assertEquals( 0, $ delete ) ; 
            
            $ delete = Post: : model( ) - > deleteAllByAttributes( array ( 'id' = > '2' ) , 'content = ?' , array ( 'content2') ) ; 
            //DELETE FROM `tbl_post` WHERE `tbl_post`.`id`='2' AND (content = 'content2') 
            $ this - > assertEquals( 1, $ delete ) ; 
        } 
    } 
    ? >