SQL查询多级节点方法

设计资料表中的字段必须有的ID和ParentID 他们的关系是自身引用。

下面以 TableName(ID INT,ParentID INT) 表来做事例

 

IF object_id('rTableNameByParentID') IS NOT NULL
    DROP PROCEDURE rTableNameByParentID
GO
CREATE PROCEDURE rTableNameByParentID
@ParentID int ,
@HasParent bit =0
AS
BEGIN

    SET NOCOUNT ON

    DECLARE @TypeID TABLE(ID INT)

    ;With CTE_TableNameID AS
    (
        SELECT ID FROM TableName WHERE  ParentID=@ParentID
        UNION ALL
        SELECT a.ID FROM (SELECT *FROM TableName ) AS a INNER JOIN CTE_TableNameID AS b ON a.ParentID=b.ID
    )

    INSERT INTO @TypeID SELECT ID FROM CTE_TableNameID

    IF (@HasParent<>0)
    BEGIN
        INSERT INTO @TypeID SELECT ID FROM TableName WHERE ID=@ParentID
    END

    SELECT ID,ParentID FROM TableName WHERE ID IN(SELECT ID FROM @TypeID)
END