PostgreSQL程序语言“C”未找到

我试图在Postgresql 9.2数据库中使用 PL/R过程语言.我已经安装了plr语言,我正在尝试将其添加到数据库中.当我运行命令CREATE EXTENSION plr;我收到以下错误：

ERROR:  language "C" does not exist
STATEMENT:  CREATE EXTENSION plr;
ERROR:  language "C" does not exist

当我使用select * from pg_language列出数据库中的可用语言时;我明白了

lanname  | laNowner | lanispl | lanpltrusted | lanplcallfoid | laninline | lanvalidator | lanacl 
 ----------+----------+---------+--------------+---------------+-----------+--------------+--------
  internal |       10 | f       | f            |             0 |         0 |         2246 | 
  c        |       10 | f       | f            |             0 |         0 |         2247 | 
  sql      |       10 | f       | t            |             0 |         0 |         2248 | 
  plpgsql  |       10 | t       | t            |         12514 |     12515 |        12516 | 
 (4 rows)

所以有一种语言c但它不是大写字母(不确定这是否有所不同).

我想知道为什么plr扩展名没有找到C程序语言？

您可能在Postgresql 9.2(引用 release notes here)中遇到此更改：

No longer forcibly lowercase procedural language names in CREATE
FUNCTION (Robert Haas)

While unquoted language identifiers are still lowercased,strings and
quoted identifiers are no longer forcibly down-cased. Thus for example
CREATE FUNCTION … LANGUAGE ‘C’ will no longer work; it must be
spelled ‘c’,or better omit the quotes.

它也反映在manual for CREATE FUNCTION

lang_name

The name of the language that the function is implemented in. Can be sql,C,internal,or the name of a user-defined procedural
language. For backward compatibility,the name can be enclosed by
single quotes.

至少从版本7.3(可能更长)开始,不鼓励引用语言名称,但显然老习惯很难.删除’C’周围的引号可以解决问题,到达：LANGUAGE c或LANGUAGE C.

从project page开始,PL / R在这方面还没有为Postgresql 9.2做好准备.

从反馈Joe Conway

Joe Conway留下了一个被删除的答案,因为它应该是一个评论.我将它粘贴到一般公众身上,无法看到已删除的答案：

I got the message,just haven’t had the time to do a new PL/R release. Look for it by December,but in the meantime the manual workaround noted above is pretty simple.

PostgreSQL程序语言“C”未找到

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