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

Question

所以在我的 C# 后台代码中，我有一个 Select 语句：

Select username from vw_members where username = 'SomeValue'

但是 returns 我的 aspx 上的这个错误 page:column "username" 不存在

如果我运行在 pgAdmin SQLEditor 中使用相同的语句运行没问题

如果我运行在我的后台代码中有这样的东西：

Select username from tbl_users where username = 'SomeValue'

运行良好。

该视图是与用户 table 和成员 table 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

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

可能没什么区别，但值得一试。

Answer 2

有人建议我查看是否启用了区分大小写的列整理，结果证明它已启用。从那里我确保我所有的列名在相同的情况下匹配，之后一切正常。

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

C# vs SQLEditor -- Npgsql.PostgresException 42703: column "username" does not exist

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