postgresql – Postgres报告关系不存在,但表存在

我有一个快速的应用程序,我正在连接到我的Postgres数据库.这是我的代码：

var express = require('express');
var app = express();
var pg = require('pg').native;
var connectionString = process.env.DATABASE_URL || 'postgres://localhost:5432/isx';
var port = process.env.PORT || 3000;
var client;


app.use(express.bodyParser());

client = new pg.Client(connectionString);
client.connect();

app.get('/users',function(req,res) {
  'use strict';
  console.log('/users');
  var query = client.query('SELECT * FROM users');
  query.on('row',function(row,result) {
    result.addRow(row);
  });
  query.on('end',function(result) {
    console.log(result);
    res.json(result);
  });
});

我去我当地的Postgres看看isx db,这里有可用的表格.

List of relations
 Schema |   Name   | Type  |  Owner   
--------+----------+-------+----------
 public | projects | table | postgres
 public | users    | table | postgres
(2 rows)

但是,当我尝试点击用户表时,我收到此错误错误：关系“用户”不存在.

关系用户存在.我已经检查过,并且我已经连接到Postgres的实例,我认为我已连接到该实例.我还能错过什么？

解决方法

检查潜在的权限问题,例如不正确的搜索路径,或不正确的权限,或该订单的某些内容.您可以运行此查询以显示所有可用表,例如：

select relname
from pg_class c
where pg_table_is_visible(c.oid)
and relkind = 'r'
and relname not like E'pg\_%';

也可能值得研究区分大小写的相关问题.例如,也许pg库在小写标识符周围添加双引号,并且您使用CamelCase创建了表,或者该命令的某些内容.

然后检查search_path(如果相关)：

show search_path;

如果路径正确,则检查权限,例如使用：

select usename,nspname || '.' || relname as relation,case relkind when 'r' then 'TABLE' when 'v' then 'VIEW' end as relation_type,priv
from pg_class join pg_namespace on pg_namespace.oid = pg_class.relnamespace,pg_user,(values('SELECT',1),('INSERT',2),('UPDATE',3),('DELETE',4)) privs(priv,privorder)
where relkind in ('r','v')
      and has_table_privilege(pg_user.usesysid,pg_class.oid,priv)
      and not (nspname ~ '^pg_' or nspname = '@R_40_4045@ion_schema')
order by 2,1,3,privorder;

取自：Find out if user got permission to select/update/… a table/function/… in PostgreSQL

如果相关,请使用alter schema和/或alter table修复权限：

> http://www.postgresql.org/docs/current/static/sql-alterschema.html
> http://www.postgresql.org/docs/current/static/sql-altertable.html