我是否可以重用SQL或对此存储过程使用某种类型的动态连接？

Question

我有一个GetUsers存储过程，如下所示。如果提供了@GroupId或@GroupName参数，那么我需要增强存储过程以确保仅返回属于匹配组的用户。

我创建了一个名为@GroupUserMatches的特殊表变量，其中包含用于匹配用户组的UserId / GroupId关联。我基本上可以将ELSE块中的SQL复制/粘贴到IF块中并稍微更新它以适应@GroupUserMatches的连接，但我想知道是否有更优雅的方法来执行此操作？

一个问题是我希望避免在同一存储过程中对2个不同块中的相同SQL select进行更新。如果未提供@GroupId或@GroupName，则返回的用户列表应完全未按组进行过滤。

ALTER PROCEDURE [dbo].[GetUsers]
    @DomainId uniqueidentifier = NULL,
    @DomainName varchar(100) = NULL,
    @NetworkUserId varchar(100) = NULL,
    @UserPrincipalName varchar(100) = NULL,
    @FirstName varchar(100) = NULL,
    @LastName varchar(100) = NULL,
    @EmailAddress varchar(255) = NULL,
    @GroupId uniqueidentifier = NULL,
    @GroupName varchar(500) = NULL
AS
BEGIN
    SET NOCOUNT ON;

    DECLARE @GroupUserMatches TABLE
    (
        GroupId UNIQUEIDENTIFIER, 
        UserId UNIQUEIDENTIFIER
    )

    IF(@GroupId IS NOT NULL OR @GroupName IS NOT NULL)
    BEGIN
        INSERT INTO @GroupUserMatches (GroupId, UserId)
            SELECT geue.GroupExtensionId, geue.UserExtensionId
            FROM ADGroup adg 
            JOIN GroupExtension ge ON adg.Id = ge.ADGroupId
            JOIN GroupExtensionUserExtension geue ON ge.Id = geue.GroupExtensionId
            WHERE (@GroupId IS NULL OR ge.Id = @GroupId) 
              AND (@GroupName IS NULL OR adg.[Name] LIKE @GroupName + '%')
    END
    ELSE
    BEGIN
        SELECT 
            au.*,
            0 HasExtendedSecurity
        FROM 
            AllUsers au
        JOIN 
            Domain d ON au.DomainName = d.[Name]
        WHERE 
            (@DomainId IS NULL OR au.DomainId = @DomainId) AND
            (@DomainName IS NULL OR au.DomainName = @DomainName) AND
            (@NetworkUserId IS NULL OR au.NetworkUserId = @NetworkUserId) AND
            (@UserPrincipalName IS NULL OR au.UserPrincipalName = @UserPrincipalName) AND
            (@FirstName IS NULL OR au.FirstName LIKE @FirstName + '%') AND
            (@LastName IS NULL OR au.LastName LIKE @LastName + '%' ) AND 
            (@EmailAddress IS NULL OR au.Email LIKE @EmailAddress + '%') 
    END
END