如何使用 SQL 获取整个链接组详细信息？

问题描述 投票：0回答：3

数据库中有名为“MYGROUP”的表。我在 GUI 中以树形格式显示此表数据，如下所示：

Vishal Group
|
|-------Vishal Group1
|          |-------Vishal Group1.1
|                     |-------Vishal Group1.1.1
|
|-------Vishal Group2
|          |-------Vishal Group2.1
|                     |-------Vishal Group2.1.1
|
|-------Vishal Group3
|   
|-------Vishal Group4
|          |-------Vishal Group4.1

实际上，要求是，我需要访问每个组的最低根，如果其他特定表中没有使用相应的组，那么我会从相应的表中删除该记录。

我只需要获取名为“Vishal Group”的主组的所有详细信息，请参阅两个快照，一个包含整个表数据，另一个快照（具有树格式详细信息的快照）显示预期数据，即我需要获取仅那些作为 SQL 执行结果的记录。

我尝试使用自连接（通常我们对 MGR 和 Employee 列关系这样做），但没有成功获取属于“Vishal Group”（所有记录的基础）下的记录。

我添加了表DDL和插入SQL以供参考，如下所示。还附上了数据在表格中的外观的快照。

CREATE TABLE MYGROUP 
(
  PK_GROUP GUID DEFAULT 'newid()' NOT NULL,
  DESCRIPTION Varchar(255),
  LINKED_TO_GROUP GUID,
  PRIMARY KEY (PK_GROUP)
);

COMMIT;


INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{11111111-111-1111-1111-111111111111} ', 'My Items', NULL);


INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{CD1E33D1-1666-49B9-83BE-067687E4DDD6}', 'Vishal Group', '{11111111-111-1111-1111-111111111111}');

INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{4B42E7A5-B14C-451B-ACF5-83DD8A983A58}', 'Vishal Group1', '{CD1E33D1-1666-49B9-83BE-067687E4DDD6}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{A87E921D-0468-497D-92C5-19AB63751EE8}', 'Vishal Group1.1', '{4B42E7A5-B14C-451B-ACF5-83DD8A983A58}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{0FDC729A-8FCC-4D23-8619-436A459835DD}', 'Vishal Group1.1.1', '{A87E921D-0468-497D-92C5-19AB63751EE8}');

INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{2E15A2A9-7E40-422E-A5D6-C3F6C63F8591}', 'Vishal Group2', '{CD1E33D1-1666-49B9-83BE-067687E4DDD6}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{5EAC9866-F406-4BBD-B7B3-5CEEC3877C9B}', 'Vishal Group2.1', '{2E15A2A9-7E40-422E-A5D6-C3F6C63F8591}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{A326E6E3-030E-493B-AA0E-DC5D90DB080F}', 'Vishal Group2.1.1', '{5EAC9866-F406-4BBD-B7B3-5CEEC3877C9B}');

INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{3CF1FE37-EEC0-4E79-A3C5-DB78F6A9BC05}', 'Vishal Group3', '{CD1E33D1-1666-49B9-83BE-067687E4DDD6}');

INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{1EC302C8-0AB3-4F67-B47A-CC43401DF4ED}', 'Vishal Group4', '{CD1E33D1-1666-49B9-83BE-067687E4DDD6}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{2EB81764-04FA-4DDA-9AAB-A607BDC2756D}', 'Vishal Group4.1', '{1EC302C8-0AB3-4F67-B47A-CC43401DF4ED}');


INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{7D939081-13F0-404C-9F2F-5222C628FDCC}', 'Sample BOMs', '{11111111-111-1111-1111-111111111111}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{C77D2255-AC47-461D-BEE5-7F3154C23AF1}', 'Test1', '{11111111-111-1111-1111-111111111111}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{D054539A-BBBA-4E3F-9746-1522FF8A1E89}', 'Test2', '{11111111-111-1111-1111-111111111111}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{71B4751C-7096-4FB9-8D71-6BB19A3D9ED9}', 'Trailer Assy', '{11111111-111-1111-1111-111111111111}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{F702BABB-73B0-4A49-B442-1C7C8A126335}', 'WIP', '{11111111-111-1111-1111-111111111111}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{FC74D59A-94E3-4209-BCEA-1B7606EA62F1}', 'mmmmmm', '{11111111-111-1111-1111-111111111111}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{6E4354F9-B298-4737-9C18-51B4ACAC0734}', 'test1', '{11111111-111-1111-1111-111111111111}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{42A48EE0-D4EE-4828-BC11-D7F0D1FE5BEC}', 'test1', '{11111111-111-1111-1111-111111111111}');
INSERT INTO MYGROUP (PK_GROUP, DESCRIPTION, LINKED_TO_GROUP) VALUES ('{28AFE8E1-1221-4F94-BAE3-37EA6B360494}', 'test_2', '{11111111-111-1111-1111-111111111111}');

COMMIT;

知道如何获取属于“Vishal Group”的记录吗？

enter image description here

enter image description here

sql firebird common-table-expression recursive-query firebird2.5
3个回答
2
投票

作为递归存储过程的更清晰的替代方案，这里是一个使用 CTE（公用表表达式）的存储过程：

SET TERM ^ ;

CREATE OR ALTER procedure RECURSIVE_MYGROUP (
    PK_GROUP_IN GUID)
returns (
    PK_GROUP GUID,
    DESCRIPTION varchar(255),
    LINKED_TO_GROUP GUID)
as
begin
  for with recursive RECUR_MYGROUP
      as (select M.PK_GROUP, M.DESCRIPTION, M.LINKED_TO_GROUP
          from MYGROUP M
          where M.PK_GROUP = :PK_GROUP_IN
          union all
          select M.PK_GROUP, M.DESCRIPTION, M.LINKED_TO_GROUP
          from RECUR_MYGROUP RM
          inner join MYGROUP M on M.LINKED_TO_GROUP = RM.PK_GROUP)
      select *
      from RECUR_MYGROUP
      into :PK_GROUP, :DESCRIPTION, :LINKED_TO_GROUP
  do
  begin
    suspend;
  end
end^

SET TERM ; ^

然后你可以使用：

select * from recursive_mygroup('{CD1E33D1-1666-49B9-83BE-067687E4DDD6}');
1
投票

您可以像这样使用递归存储过程：

  SET TERM ^ ;    

  create or alter procedure MYGROUP_PROC (
        IPARENT varchar(64))
    returns (
        PK_GROUP varchar(64),
        DESCRIPTION varchar(255),
        LINKED_TO_GROUP varchar(64))
    as
    declare variable I integer;
    BEGIN
      FOR
        select 
            mygroup.pk_group,
            mygroup.description,
            mygroup.linked_to_group
        from mygroup
        where
          (upper(mygroup.linked_to_group) = upper(:iparent))
        INTO :PK_GROUP,
             :DESCRIPTION,
             :LINKED_TO_GROUP
      DO
      BEGIN
        suspend;
        i = 0;
        /* Stored procedures can be nested up to 1,000 levels deep. This limitation helps to prevent infinite loops that can occur when a recursive procedure provides no absolute terminating condition.*/
        while (i < 1000) do
          begin
            execute procedure mygroup_proc(:pk_group) returning_values (:pk_group,:description,:linked_to_group);
            if (:pk_group is null) then break;
            suspend;
            i = i+1;
          end
      END
    END^

SET TERM ; ^

当输入参数为

{CD1E33D1-1666-49B9-83BE-067687E4DDD6}
时（PK of 
Vishal Group

） 结果是：

enter image description here

更新

是否也可以在输出中获得“Vishal Group”记录？

是的，首先阅读您可以在其他过程中执行上面的过程，例如：

SET TERM ^ ;

create or alter procedure MYGROUP_PROC_1 (
    IPARENT varchar(100))
returns (
    PK_GROUP varchar(64),
    DESCRIPTION varchar(255),
    LINKED_TO_GROUP varchar(64))
as
BEGIN
  FOR
    select 
        mygroup.pk_group,
        mygroup.description,
        mygroup.linked_to_group
    from mygroup
    where 
      (upper(mygroup.description) = upper(:iparent))
      /*
      or (upper(mygroup.pk_group) = upper(:iparent)) instead
      if you want to use pk_group as input parameter
      */
    INTO :PK_GROUP,
         :DESCRIPTION,
         :LINKED_TO_GROUP
  DO
  BEGIN
    suspend;
     for
      select pk_group, description,linked_to_group from mygroup_proc(:pk_group)
      into
        :PK_GROUP,
        :DESCRIPTION,
        :LINKED_TO_GROUP
    do
      begin
        suspend;
      end
  end
END^ 

SET TERM ; ^

然后使用

SELECT * FROM MYGROUP_PROC_1('Vishal Group')

或

SELECT * FROM MYGROUP_PROC_1('{CD1E33D1-1666-49B9-83BE-067687E4DDD6}')

如果使用 pk_group 作为参数

1
投票

下面的SQL不是我写的，而是我从Firebird Yahoo group得到的：

WITH RECURSIVE
G1_PARENT AS
(
  SELECT MGP.DESCRIPTION FROM MYGROUP MG INNER JOIN MYGROUP MGP ON MGP.PK_GROUP=MG.LINKED_TO_GROUP WHERE MG.DESCRIPTION='Vishal Group1'
),
R_TREE AS
(
  SELECT TT.PK_GROUP AS A, CAST(CASE WHEN TT.DESCRIPTION=GP.DESCRIPTION THEN GP.DESCRIPTION ELSE '' END AS VARCHAR(255)) AS PARENT
  FROM MYGROUP TT LEFT JOIN G1_PARENT GP ON 1=1
  WHERE TT.LINKED_TO_GROUP IS NULL

  UNION ALL

  SELECT TT.PK_GROUP AS A, CASE WHEN TT.DESCRIPTION=GP.DESCRIPTION THEN GP.DESCRIPTION ELSE RT.PARENT END AS PARENT
  FROM MYGROUP TT LEFT JOIN G1_PARENT GP ON 1=1
  JOIN R_TREE RT ON RT.A = TT.LINKED_TO_GROUP
)

SELECT
*
FROM
R_TREE RT2
INNER JOIN G1_PARENT GP ON RT2.PARENT=GP.DESCRIPTION
INNER JOIN MYGROUP TT2 ON TT2.PK_GROUP=RT2.A
最新问题
© www.soinside.com 2019 - 2024. All rights reserved.