如何在 Sequelize 中使用 LEFT JOIN？

Posted 2023-03-07

【中文标题】如何在 Sequelize 中使用 LEFT JOIN？

【英文标题】：How can I use LEFT JOIN with Sequelize?

【发布时间】：2015-02-18 03:29:34

【问题描述】：

我有以下 Sequelize 关系：

Shop.hasMany(ShopAd, foreignKey : 'shop_id', as : 'ads');
ShopAd.belongsTo(Shop, foreignKey : 'id')

对于以下 Sequelize 查询：

Shop.findAll(
    where: id:shopId,
    include: [model:ShopAd, as:'ads', where:is_valid:1, is_vertify:1]
).success(function(result) 
    callback(result);
);

Sequelize 为此查询运行的 SQL 是：

SELECT `Shop`.`id`, `Shop`.`user_id`, `Shop`.`short_name`, `Shop`.`description`, `Shop`.`tips`, `Shop`.`city`, `Shop`.`province`, `Shop`.`address`, `Shop`.`logo`, `Shop`.`publicity_photo`, `Shop`.`taobao_link`, `Shop`.`is_vertify`, `Shop`.`create_time`, `Shop`.`update_time`, `ads`.`id` AS `ads.id`, `ads`.`shop_id` AS `ads.shop_id`, `ads`.`pic_url` AS `ads.pic_url`, `ads`.`description` AS `ads.description`, `ads`.`link` AS `ads.link`, `ads`.`is_valid` AS `ads.is_valid`, `ads`.`is_vertify` AS `ads.is_vertify`, `ads`.`create_time` AS `ads.create_time`, `ads`.`update_time` AS `ads.update_time` FROM `weshop_shop` AS `Shop`
INNER JOIN `weshop_shop_advertsing` AS `ads` ON `Shop`.`id` = `ads`.`shop_id` AND `ads`.`is_valid`=1 AND `ads`.`is_vertify`=1 WHERE `Shop`.`id`='1';

执行INNER JOIN。

我想改用LEFT JOIN。如何使用 Sequelize 做到这一点？

【参考方案1】：

使用： required:false

句子：

Shop.findAll(
     where:id:shopId, 
     include:[
          model:ShopAd, as:'ads', 
           where: 
                 is_valid:1, 
                 is_vertify:1,   
           required:false
           
         ]
      )
      .success(function(result) 
        callback(result);
    );

【讨论】：

但是如何在关系的声明中强制使用 LEFT JOIN？

【参考方案2】：

required: true 强制INNER JOIN，使用required: false 强制LEFT JOIN。

取自here。