即使扩展名已经存在,dblink也不存在? [英] dblink does not exist even when the extension already exists?

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问题描述

因此,我刚开始使用 dblink ,我刚刚创建了一个脚本,该脚本可将数据从另一个数据库插入到表中。我收到错误函数dblink(未知,未知)不存在

So I'm new to using dblink, I just created a script that inserts data into a table from another database. I received the error function dblink(unknown,unknown) does not exist.

所以我在线检查并使用创建扩展dblink ,最终得到此消息扩展 dblink已存在

So I checked online, and used CREATE EXTENSION dblink, ended up getting this message extension "dblink" already exists.

我的数据库链接代码是这样的:

My dblink code is like this:

INSERT INTO tableA
 SELECT tbl.colA,tbl.colB,...
 FROM dblink('dbname=anotherDB', 'SELECT colA,colB,...
                 FROM tableB')
as tbl(colA,colB,...)


推荐答案

查看扩展安装在哪个架构中。在我的情况下,此架构为 ext

Check out in which schema the extension is installed. In my case this schema is ext:

select nspname as schema
from pg_extension e
join pg_namespace n on n.oid = e.extnamespace
where extname = 'dblink'

 schema 
--------
 ext
(1 row) 

将架构名称添加到搜索路径,例如:

Add the schema name to the search path, e.g.:

set search_path to public, ext;

或使用函数的合格名称 dblink(),例如:

or use the qualified name of the function dblink(), e.g.:

INSERT INTO tableA
 SELECT tbl.colA,tbl.colB,...
 FROM ext.dblink('dbname=anotherDB', 'SELECT colA,colB,...
                 FROM tableB')
as tbl(colA,colB,...)

这篇关于即使扩展名已经存在,dblink也不存在?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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