在“DROP SCHEMA public”之后无法创建新表。 [英] Cannot create a new table after "DROP SCHEMA public"

问题描述

由于我想删除一些表，有人建议下面，我做到了：

Since I wanted to drop some tables and somebody suggested the below and I did it:

postgres=# drop schema public cascade;
DROP SCHEMA
postgres=# create schema public;
CREATE SCHEMA

然后我在创建新数据库时遇到问题，如：

Then I got problem when creating a new database, such as:

postgres=# create database test;
CREATE DATABASE
postgres=# \c test
You are now connected to database "test" as user "postgres".
test=# create table hi(id int primary key);
*ERROR:  no schema has been selected to create in*

错误

错误：尚未选择在*中创建模式

ERROR: no schema has been selected to create in*

如何恢复公共模式？

我建议人们不要做drop schema public cascade;如果我们不知道如何恢复。有人可以帮助我吗？

How can I restore the public schema?
I suggest people never do "drop schema public cascade;" if we don't know how to restore. Can somebody help me out?

推荐答案

当 search_path 可以找到。

它是错误配置。

The error message pops up when none of the schemas in your search_path can be found.
Either it is mis-configured. What do you get for this?

SHOW search_path;

或者您已删除了 public 标准系统数据库 template1 。当您运行 drop schema public cascade时，您可能已连接到错误的数据库;

Or you deleted the public schema from your standard system database template1. You may have been connected to the wrong database when you ran drop schema public cascade;

顾名思义，这是创建新数据库的模板。因此，每个新数据库开始时没有（默认）模式 public 现在 - 而您的默认 search_path 'in it。

As the name suggests, this is the template for creating new databases. Therefore, every new database starts out without the (default) schema public now - while your default search_path probably has 'public' in it.

只要运行（以超级用户 public 或参见 mgojohn的回答）：

Just run (as superuser public or see mgojohn's answer):

CREATE SCHEMA public;

template1 db

通过 DROP SCHEMA ... CASCADE 删除其中的所有对象很快就是有效的。

The advice with DROP SCHEMA ... CASCADE to destroy all objects in it quickly is otherwise valid.

这篇关于在“DROP SCHEMA public”之后无法创建新表。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！