如何獲得插入兒童的父母ID的ID

Question

我有父母和孩子的表。

目標是複製記錄，除了新的主鍵。

原始表

Parent(id) 
1 

Child(id,parentId, data) 
1,1 
2,1 

插入後：

Parent 
1 
2 

Child 
1,1 
2,1 
3,2 
4,2 

我該怎麼辦呢？我遇到問題的部分是獲取用於子記錄的新父鍵。

這就是我到目前爲止所提出的。

--DECLARE VARS 
declare @currentMetadataDocumentSetId int = 1, --Ohio 
    @newMetadataDocumentSetid int = 3; --PA 

--CLEANUP 
IF OBJECT_ID('tempdb..#tempFileRowMap') IS NOT NULL 
    /*Then it exists*/ 
    DROP TABLE #tempFileRowMap 

--Remove existing file row maps. 
delete from file_row_map where metadata_document_set_id = @newMetadataDocumentSetid; 


--Create a temptable to hold data to be copied. 
Select [edi_document_code], 
    [functional_group], 
    [description], 
    3 as [metadata_document_set_id], 
    [document_name], 
    [incoming_file_row_subtype], 
    [metadata_document_id], 
    [document_subcode], 
    [outgoing_file_row_subtype], 
    [asi_type_code], 
    [asi_action_code], 
    [metadata_document_set], 
    file_row_map_id as orig_file_row_map_id 
into #tempFileRowMap 
from file_row_map fileRowMap 
where metadata_document_set_id = @currentMetadataDocumentSetId; 


--Select * from #tempFileRowMap; 
Insert into file_row_map select 
[edi_document_code], 
[functional_group], 
[description], 
[metadata_document_set_id], 
[document_name], 
[incoming_file_row_subtype], 
[metadata_document_id], 
[document_subcode], 
[outgoing_file_row_subtype], 
[asi_type_code], 
[asi_action_code], 
[metadata_document_set] 
from #tempFileRowMap 

--Show Results 
Select * from file_row_map fileRowMap where fileRowMap.metadata_document_set_id = @newMetadataDocumentSetid 


--Update Detail 
Select 
[file_row_map_id], 
[file_row_column], 
[element_code], 
[element_metadata_id], 
[col_description], 
[example], 
[translate], 
[is_used], 
[is_mapped], 
[page_num], 
[subcode], 
[qualifier], 
[loop_code], 
[loop_subcode], 
[default_value], 
[delete_flag] 
into #tempFileRowMapDetail 
from [dbo].[file_row_map_detail] d 
left join #tempFileRowMap m 
on m.orig_file_row_map_id = d.file_row_map_id 

select * from #tempFileRowMapDetail 

Answer 1

只需使用OUTPUT子句獲取確切的父表主鍵值。

讓我們建立示例模式對你的情況

--For Capturing inserted ID 
CREATE TABLE #ID_CAPTURE (PARENT_ID INT,ORDER_NME VARCHAR(20)); 

--Your Intermidiate Data To insert into Actual Tables 
CREATE TABLE #DUMMY_TABLE (ORDER_NME VARCHAR(20), ITEM_NME VARCHAR(20)); 

--Actual Tables 
CREATE TABLE #ORDER_PARENT (ORDER_ID INT IDENTITY,ORDER_NME VARCHAR(20)) 
CREATE TABLE #ORDER_CHILD (CHILD_ID INT IDENTITY ,ORDER_ID INT, ORDER_NME VARCHAR(20)) 


INSERT INTO #DUMMY_TABLE 
SELECT 'BILL1','Oil' 
UNION ALL 
SELECT 'BILL1', 'Gas' 
UNION ALL 
SELECT 'BILL2', 'Diesel' 

現在做插入在父&子表

INSERT INTO #ORDER_PARENT 
OUTPUT inserted.ORDER_ID, inserted.ORDER_NME into #ID_CAPTURE 

SELECT DISTINCT ORDER_NME FROM #DUMMY_TABLE 


INSERT INTO #ORDER_CHILD 

SELECT C.PARENT_ID, ITEM_NME FROM #DUMMY_TABLE D 
INNER JOIN #ID_CAPTURE C ON D.ORDER_NME = C.ORDER_NME 



SELECT * FROM #ID_CAPTURE 
SELECT * FROM #ORDER_CHILD 

還有其他的方式來獲得插入的標識值。

見文檔@@IDENTITY (Transact-SQL)，SCOPE_IDENTITY

Answer 2

嘗試以下方法：

DECLARE @Table1 TABLE (
    ID   INT NOT NULL PRIMARY KEY, 
    ParentID INT NULL, -- FK 
    [Desc]  VARCHAR(50) NOT NULL 
); 
INSERT @Table1 (ID, ParentID, [Desc]) 
VALUES 
(1, NULL, 'A'), 
(2, 1, 'AA.1'), 
(3, 1, 'AA.2'), 
(4, NULL, 'B'), 
(5, 4, 'BB.1'), 
(6, 4, 'BB.2'), 
(7, 4, 'BB.3'), 
(8, 7, 'BBB.1'); 

DECLARE @ParentID INT = 4; 

DECLARE @LastID INT = (SELECT TOP(1) ID FROM @Table1 x ORDER BY x.ID DESC) 
IF @LastID IS NULL 
BEGIN 
    RAISERROR('Invalid call', 16, 1) 
    --RETURN ? 
END 
SELECT @LastID AS LastID; 
/* 
LastID 
----------- 
8 
*/ 

DECLARE @RemapIDs TABLE (
    OldID INT NOT NULL PRIMARY KEY, 
    [NewID] INT NOT NULL UNIQUE 
); 

WITH CteRecursion 
AS (
    SELECT 1 AS Lvl, crt.ID, crt.ParentID --, crt.[Desc] 
    FROM @Table1 crt 
    WHERE crt.ID = @ParentID 
    UNION ALL 
    SELECT cld.Lvl + 1 AS Lvl, crt.ID, crt.ParentID --, crt.[Desc] 
    FROM @Table1 crt 
    JOIN CteRecursion cld ON crt.ParentID = cld.ID 
) 
INSERT @RemapIDs (OldID, [NewID]) 
SELECT r.ID, @LastID + ROW_NUMBER() OVER(ORDER BY r.Lvl) AS [NewID] 
FROM CteRecursion r; 

--INSERT @Table1 (ID, ParentID, [Desc]) 
SELECT nc.[NewID] AS ID, np.[NewID] AS ParentID, o.[Desc] 
FROM @Table1 o -- old 
JOIN @RemapIDs nc /*new child ID*/ ON o.ID = nc.OldID 
LEFT JOIN @RemapIDs np /*new parent ID*/ ON o.ParentID = np.OldID 
/* 
ID   ParentID Desc 
----------- ----------- -------------------------------------------------- 
9   NULL  B 
10   9   BB.1 
11   9   BB.2 
12   9   BB.3 
13   12   BBB.1 
*/ 

注：與一些小的改動應該工件W.很多ParentID s值。