Question

我需要根据用户的角色检查用户是否具有访问权限。（ASP.NET和SQL Server）

SELECT rf.ReadAccess
FROM aspnet_Users as u INNER JOIN aspnet_Roles as r ON r.UserID=u.UserID
INNER JOIN RolesByForm as rf ON rf.RoleID=r.RoleID
WHERE u.UserID=@UserID

所以这让我很亲近，但这才是我真正想要的。我希望默认情况下可以看到表单，所以如果RolesByForm中没有记录，那么它应该是“True”。但如果有记录，它应该基于ReadAccess字段返回。

如何让查询返回布尔值？

Answer 1

尝试

SELECT case count(rf.ReadAccess) when 0 then 'True' else 'False' end ReadAccess 
FROM aspnet_Users as u INNER JOIN aspnet_Roles as r ON r.UserID=u.UserID
INNER JOIN RolesByForm as rf ON rf.RoleID=r.RoleID
WHERE u.UserID=@UserID

Answer 2

在.NET中，Sql Server字段BIT为true或false，因此：

CAST ( rf.ReadAccess as BIT)

或者，如果ReadAccess是varchar：

CASE ReadAccess
   WHEN 'Something' THEN CAST(1 as bit)
   ELSE CAST (0 as bit)
END

Answer 3

SELECT ReadAccess=CASE rf.ReadAccess WHEN 1 THEN 'True' ELSE 'False' END
FROM aspnet_Users as u INNER JOIN aspnet_Roles as r ON r.UserID=u.UserID
INNER JOIN RolesByForm as rf ON rf.RoleID=r.RoleID
WHERE u.UserID=@UserID

在你的.net代码中写下如下内容：

bool result;
bool myBoolean=Boolean.TryParse(dataset["ReadAccess"], out result);

Answer 4

假设rf.ReadAccess是位字段（1或0），那么您希望外连接捕获不存在的rolesbyform记录。

或许这样的事情？

SELECT distinct isnull(rf.ReadAccess, 1) as ReadAccess
FROM aspnet_Users as u INNER JOIN aspnet_Roles as r ON r.UserID=u.UserID
LEFT OUTER JOIN RolesByForm as rf ON rf.RoleID=r.RoleID
WHERE u.UserID=@UserID

Answer 5

您可以返回0（假）和1（真）。试试这个例子：

CREATE PROCEDURE CheckReadAccess 
@UserID INT
AS

BEGIN
DECLARE @rdAxs VARCHAR(255)

    SELECT @rdAxs = rf.ReadAccess
    FROM aspnet_Users as u INNER JOIN aspnet_Roles as r ON r.UserID=u.UserID
    INNER JOIN RolesByForm as rf ON rf.RoleID=r.RoleID
    WHERE u.UserID=@UserID

    IF @rdAxs IS NULL
        RETURN 0
    ELSE
        RETURN 1

END

如何从Query返回布尔值

5 个答案: