1.现有2张表 文章表
,作者表
1.2数据解构DDL
CREATE TABLE `article` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`article_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '文章',
`author_id` int(255) DEFAULT NULL COMMENT '外键',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='文章表';
CREATE TABLE `author` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`author_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '作者',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='作者表';
2.控制器代码:
查询文章的id与文章的名称和作者
$data=DB::table('article as t1')->select('t1.id','t1.article_name','t2.author_name')->leftJoin('author as t2','t2.id','=','t1.author_id')->get();
return dd($data);