从递归查询创建存储过程

Question

我想创建一个mssql存储过程来运行如下所示的查询:

SELECT thingID FROM things WHERE thingParentID = #arguments.id#

递归地,thingID在列表中累积s,然后由存储过程返回.

有没有人知道这样的例子,他们可以链接到？或者一些可能对我有帮助的文件？

谢谢.

Answer 1

这将适用于SQL Server 2005及更高版本.

CREATE FUNCTION dbo.Ancestors (@thingID int)
RETURNS TABLE
AS
RETURN
    WITH CTE AS
    (
        SELECT thingID, 1 [Level]
        FROM dbo.things
        WHERE thingParentID = @thingID

        UNION ALL

        SELECT p.thingID, [Level] + 1 [Level]
        FROM CTE c
        JOIN dbo.things p
            ON p.thingParentID = c.thingID
    )
    SELECT thingID, [Level]
    FROM CTE

GO

CREATE PROCEDURE GetAncestors (@thingID int)
AS
    SELECT thingID, [Level]
    FROM dbo.Ancestors(@thingID)
GO