C# vs SQLEditor -- Npgsql.PostgresException 42703：列"username"不存在

Question

所以在 C# 中的后台代码中，我有一个 Select 语句：

Select username from vw_members where username = 'SomeValue'

但这在我的aspx页面上返回此错误：列"用户名"不存在

如果我在 pgAdmin SQLEditor 中运行相同的语句，它运行没有问题

如果我在我的隐藏代码上运行这样的东西：

Select username from tbl_users where username = 'SomeValue'

运行正常。

该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

有人建议我看看是否启用了区分大小写的列排序规则，结果是它已启用。从那里我确保我的所有列名称在同一个情况下匹配，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。