mysql - 将表的键字段从一个数据库同步到另一个数据库

Question

我有两个数据库

Test1

Test2

并且我在每个数据库中都有 Author 表，我想将 AuthorId 从 Test1 同步到 Test2 .

在 Test2 中还有另一个表 ProductAuthor，它在 Author 表中对 AuthorID 有 f外键约束。

我现在正在做的是

1. 去掉外键约束

2. 更新两个表:Author 和 ProductAuthor

3. 添加外键约束

    --remove the foreign key constraint
   
   ALTER TABLE [dbo].[ProductAuthor] DROP CONSTRAINT [FK_ProductAuthor_Author]
   
   Update Test2.dbo.ProductAuthor set AuthorId = (
   select distinct T1A.AuthorId from Test1.dbo.Author T1A 
   INNER JOIN Test2.dbo.Author T2A ON T1A.FirstName =  T2A.firstname COLLATE Latin1_General_CI_AS and T1A.LastName =  T2A.surname COLLATE Latin1_General_CI_AS
   where T2A.AuthorId = ProductAuthor.AuthorId
   ) where ProductAuthor.AuthorId = 6793
   
   Update Test2.dbo.Author set AuthorId = (
   select Distinct T1A.AuthorId from Test1.dbo.Author T1A 
   INNER JOIN Test2.dbo.Author T2A ON T1A.FirstName =  T2A.firstname COLLATE Latin1_General_CI_AS and T1A.LastName =  T2A.surname COLLATE Latin1_General_CI_AS
   where T1A.AuthorId = 106793) where Test2.dbo.AuthorId = 6793
   
   
   --add the foreign key constraint
   ALTER TABLE [dbo].[ProductAuthor]  WITH NOCHECK ADD  CONSTRAINT [FK_ProductAuthor_Author] FOREIGN KEY([AuthorId])
   REFERENCES [dbo].[Author] ([AuthorId])
   

上面的脚本将 特定的 AuthorId 从 Test1.Author 更新为 Test2.Author 和 Test2.ProductAuthor

提问:
我将如何更改脚本，以便它根据 Test1.Author 中的名字和姓氏更新 Test2.Author 和 Test2.ProductAuthor 中的所有行？

Answer 1

我认为您要做的是更新并选择此处找到的内容:

How to do 3 table JOIN in UPDATE query?

你可能只需要做一个基本的连接——即

JOIN (SELECT * FROM db1.author WHERE ....) as db1
SET db2.author = db1.ID

尝试一下，看看它是否有效。