简体繁体 English

如何从PostgreSQL数据库2中的函数更新数据库1中的表？

[英]How to update table in database1 from function in database2 in PostgreSQL?

原文 2010-02-23 14:31:42 4 3 sql/ database/ postgresql/ plpgsql

Is there a way to update a table in database1 from a function in database2 (both databases are on the same server)? 有没有一种方法可以从database2中的函数更新database1中的表（两个数据库都在同一服务器上）？ Basically cross database update in PostgreSQL. 基本上是在PostgreSQL中跨数据库更新。

Function is executed by a trigger but it shouldn't matter. 函数由触发器执行，但这无关紧要。

-= edit =- I know I can make it using DBLink but I would like to modify the source database as little as possible. -=编辑=-我知道我可以使用DBLink做到这一点，但我想尽可能少地修改源数据库。 I'm looking for some other options. 我正在寻找其他选择。

3 个解决方案

You could put both databases in the same Postgresql database, but in different schemas. 您可以将两个数据库放在同一个Postgresql数据库中，但是放在不同的模式中。

This way, they are still logically separated, and there is no name clash, but you can access objects in between the schemas. 这样，它们在逻辑上仍然是分开的，并且没有名称冲突，但是您可以访问架构之间的对象。

DBLink would be the standard way to do this if it was available. 如果可用，DBLink将是执行此操作的标准方法。 Absent that, if you have a procedural language installed (other than PL/pgsql) like PL/pgperl, you can use that language to connect to database 2 and call your update statement. 如果没有安装像PL / pgperl这样的过程语言（不是PL / pgsql），则可以使用该语言连接到数据库2并调用更新语句。 Or you could use the procedural language to call a shell script that calls psql to do your update. 或者，您可以使用过程语言来调用Shell脚本，该脚本调用psql进行更新。

It's not clear what you're looking for. 不清楚您要寻找什么。

You know that databases in PostgreSQL are separate and you can't access one from another directly (by design). 您知道PostgreSQL中的数据库是分开的，并且不能（通过设计）直接访问另一个数据库。

You know that the dblink extension lets you connect two databases (same or different server). 您知道dblink扩展使您可以连接两个数据库（相同或不同的服务器）。

You find the dblink extension too invasive (ruling out small_duck's idea of merging the two databases, I suspect). 您会发现dblink扩展太具有侵入性（我怀疑排除了small_duck合并两个数据库的想法）。

I'm not sure what you think would exist that would be simpler than dblink, given that dblink is the default choice in this area. 考虑到dblink是该区域的默认选择，我不确定您认为会比dblink更简单的东西。