Question

所以我在C＃后面的代码中有一个Select语句：

Select username from vw_members where username = 'SomeValue'

但是这会在我的aspx页面上返回此错误：列“username”不存在

如果我在pgAdmin SQLEditor中运行相同的语句，则运行没问题

如果我在后面的代码上运行这样的东西：

Select username from tbl_users where username = 'SomeValue'

运行良好。

视图是与用户表和成员表的连接。这是我的C＃代码：

string selectstmt = "Select UserName from vw_members where UserName = 'SomeValue'";

我在pgAdmin中的视图如下所示：

SELECT tbl_member.usertype AS "usertype",
    tbl_member.userid AS "userid",
    tbl_member.createdate AS "createdate",
    tbl_member.lastlogindate AS "lastlogindate",
    tbl_member.email AS "email",
    tbl_users.userid AS "usersid",
    tbl_users.username AS "username",
    tbl_users.lastactivitydate AS "lastactivitydate"
   FROM tbl_users,
    tbl_member
  WHERE tbl_users.userid = tbl_member.userid;

Answer 1

有人建议我查看是否已启用 区分大小写的列排序规则 ，并且结果显示它已启用。从那里我确保我的所有列名都匹配相同的情况，之后一切正常。

Answer 2

尝试在视图中使用显式联接：

SELECT tbl_member.usertype AS "usertype",
    tbl_member.userid AS "userid",
    tbl_member.createdate AS "createdate",
    tbl_member.lastlogindate AS "lastlogindate",
    tbl_member.email AS "email",
    tbl_users.userid AS "usersid",
    tbl_users.username AS "username",
    tbl_users.lastactivitydate AS "lastactivitydate"
FROM tbl_users LEFT OUTER JOIN tbl_member
    ON tbl_users.userid = tbl_member.userid

可能没有任何区别，但这是值得尝试的。

C＃vs SQLEditor - Npgsql.PostgresException 42703：列“用户名”不存在

2 个答案: