laravel原生DB连表查询

Posted 2021-02-20 花衣终会凋零，但愿余香缠绕指间

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);

2.1打印显示结果如下：