C＃与SQLEditor — Npgsql.PostgresException 42703：“用户名”列不存在

Question

因此，在C＃中的后台代码中，我有一个Select语句：

Select username from vw_members where username = 'SomeValue'

但这会在我的aspx页面上返回此错误：列“用户名”不存在

如果我在pgAdmin SQLEditor中运行同一条语句，则不会有问题

如果我在我的背后代码上运行以下代码：

Select username from tbl_users where username = 'SomeValue'

运行良好。

该视图是与用户表和成员表的联接。 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

建议我看看是否启用了区分大小写的列排序规则 ，事实证明它已启用。 从那里，我确保所有列名称在相同情况下都匹配，然后一切正常。

Answer 2

尝试在您的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，但是可以尝试。