在 Sequelize 中使用 JOIN

Posted 2023-03-07

【中文标题】在 Sequelize 中使用 JOIN

【英文标题】：Use JOIN in Sequelize

【发布时间】：2016-12-02 17:58:10

【问题描述】：

提示如何 ？ 我有以下代码：

        db.User.findAll(
        attributes: ['id'],
        where: vipEnd: lt: expiresVip, vip: true,
        limit: 100,
        order: 'id'
    ).then(function(users) 

就4而言，是这样的：

SELECT "vkId" AS "id" 
FROM "user" AS "user" 
WHERE "user"."vipEnd" < 1469699683 --expiresVip
AND "user"."vip" = true 
ORDER BY id 
LIMIT '100';

如何达到这样的效果？

SELECT "vkId" AS "id" 
FROM "user" AS "user" 

LEFT JOIN "notification" ON "notification"."userId" = "user"."vkId"

WHERE "user"."vipEnd" < 1469699683
AND "user"."vip" = true 

AND "notification"."type" = 4
AND "notification"."expiresVipDate" < 1469699683

ORDER BY id 
LIMIT '100';

谢谢！

【参考方案1】：

您需要为模型定义关联。 前任： db.User.hasMany(db.Notification, foreignKey: 'UserId'); 使用 sequelize 中包含的属性：

db.User.findAll(
include: [
    model: db.Notification,
    required: true//true INNER JOIN, false LEFT OUTER JOIN - default LEFT OUTER JOIN
]).then(function(user) , function(err) 
res.json(err, 400););

您应该在这里咨询更多 http://docs.sequelizejs.com/en/latest/docs/associations/