T-SQL - Insert Data into Parent and Child Tables - sql

Question

Code:
CREATE TYPE dbo.tEmployeeData AS TABLE
(
FirstName NVARCHAR(50),
LastName NVARCHAR(50),
DepartmentType NVARCHAR(10),
DepartmentBuilding NVARCHAR(50),
DepartmentEmployeeLevel NVARCHAR(10),
DepartmentTypeAMetadata NVARCHAR(100),
DepartmentTypeBMetadata NVARCHAR(100)
)
GO
CREATE PROC dbo.EmployeeImport
(#tEmployeeData tEmployeeData READONLY)
AS
BEGIN
DECLARE #MainEmployee TABLE
(EmployeeID INT IDENTITY(1,1),
FirstName NVARCHAR(50),
LastName NVARCHAR(50))
DECLARE #ParentEmployeeDepartment TABLE
(EmployeeID INT,
ParentEmployeeDepartmentID INT IDENTITY(1,1),
DepartmentType NVARCHAR(10))
DECLARE #ChildEmployeeDepartmentTypeA TABLE
(ParentEmployeeDepartmentID INT,
DepartmentBuilding NVARCHAR(50),
DepartmentEmployeeLevel NVARCHAR(10),
DepartmentTypeAMetadata NVARCHAR(100))
DECLARE #ChildEmployeeDepartmentTypeB TABLE
(ParentEmployeeDepartmentID INT,
DepartmentBuilding NVARCHAR(50),
DepartmentEmployeeLevel NVARCHAR(10),
DepartmentTypeBMetadata NVARCHAR(100))
-- INSERT CODE GOES HERE
SELECT * FROM #MainEmployee
SELECT * FROM #ParentEmployeeDepartment
SELECT * FROM #ChildEmployeeDepartmentTypeA
SELECT * FROM #ChildEmployeeDepartmentTypeB
END
GO
DECLARE #tEmployeeData tEmployeeData
INSERT INTO #tEmployeeData (FirstName, LastName, DepartmentType,
DepartmentBuilding, DepartmentEmployeeLevel,
DepartmentTypeAMetadata, DepartmentTypeBMetadata)
SELECT
N'Tom_FN', N'Tom_LN', N'A',
N'101', N'IV', N'Tech/IT', NULL
UNION
SELECT
N'Mike_FN', N'Mike_LN', N'B',
N'OpenH', N'XII', NULL, N'Med'
UNION
SELECT
N'Joe_FN', N'Joe_LN', N'A',
N'101', N'IV', N'Tech/IT', NULL
UNION
SELECT
N'Dave_FN', N'Dave_LN', N'B',
N'OpenC', N'XII', NULL, N'Lab'
EXEC EmployeeImport #tEmployeeData
GO
DROP PROC dbo.EmployeeImport
DROP TYPE dbo.tEmployeeData
Notes:
The table variables are replaced by real tables in live environment.
EmployeeID and ParentEmployeeDepartmentID columns' values don't always match each other. Live environment has more records in the udt (tEmployeeData) than just 4
Goal:
The udt (tEmployeeData) will be passed into the procedure
The procedure should first insert the data into the #MainEmployee table (and get the EmployeeIDs)
Next, the procedure should insert the data into the #ParentEmployeeDepartment table (and get the ParentEmployeeDepartmentID) - note EmployeeID is coming from the previous output.
Then, the procedure should split the child level data based on the DepartmentType ("A" = insert into #ChildEmployeeDepartmentTypeA and "B" = insert into #ChildEmployeeDepartmentTypeB).
ParentEmployeeDepartmentID from #ParentEmployeeDepartment should be used when inserting data into either #ChildEmployeeDepartmentTypeA or #ChildEmployeeDepartmentTypeB
The procedure should should run fast (need to avoid row by row operation)
Output:
#MainEmployee:
EmployeeID FirstName LastName
---------------------------------
1 Tom_FN Tom_LN
2 Mike_FN Mike_LN
3 Joe_FN Joe_LN
4 Dave_FN Dave_LN
#ParentEmployeeDepartment:
EmployeeID ParentEmployeeDepartmentID DepartmentType
-------------------------------------------------------
1 1 A
2 2 B
3 3 A
4 4 B
#ChildEmployeeDepartmentTypeA:
ParentEmployeeDepartmentID DepartmentBuilding DepartmentEmployeeLevel DepartmentTypeAMetadata
---------------------------------------------------------------------------------------------------------
1 101 IV Tech/IT
3 101 IV Tech/IT
#ChildEmployeeDepartmentTypeB:
ParentEmployeeDepartmentID DepartmentBuilding DepartmentEmployeeLevel DepartmentTypeAMetadata
----------------------------------------------------------------------------------------------------------
2 OpenH XII Med
4 OpenC XII Lab
I know I can use the OUTPUT clause after the insert and get EmployeeID and ParentEmployeeDepartmentID, but I'm not sure how to insert the right child records into right tables with right mapping to the parent table. Any help would be appreciated.

Answer 1

Here is my solution (based on the same answer I've linked to in the comments):
First, you must add another column to your UDT, to hold a temporary ID for the employee:
CREATE TYPE dbo.tEmployeeData AS TABLE
(
FirstName NVARCHAR(50),
LastName NVARCHAR(50),
DepartmentType NVARCHAR(10),
DepartmentBuilding NVARCHAR(50),
DepartmentEmployeeLevel NVARCHAR(10),
DepartmentTypeAMetadata NVARCHAR(100),
DepartmentTypeBMetadata NVARCHAR(100),
EmployeeId int
)
GO
Populating it with that new employeeId column:
DECLARE #tEmployeeData tEmployeeData
INSERT INTO #tEmployeeData (FirstName, LastName, DepartmentType,
DepartmentBuilding, DepartmentEmployeeLevel,
DepartmentTypeAMetadata, DepartmentTypeBMetadata, EmployeeId)
SELECT
N'Tom_FN', N'Tom_LN', N'A',
N'101', N'IV', N'Tech/IT', NULL, 5
UNION
SELECT
N'Mike_FN', N'Mike_LN', N'B',
N'OpenH', N'XII', NULL, N'Med', 6
UNION
SELECT
N'Joe_FN', N'Joe_LN', N'A',
N'101', N'IV', N'Tech/IT', NULL, 7
UNION
SELECT
N'Dave_FN', N'Dave_LN', N'B',
N'OpenC', N'XII', NULL, N'Lab', 8
Insert part goes here
Then, you use a table variable to map the inserted value from the employee table to the temp employee id in the data you sent to the procedure:
DECLARE #EmployeeidMap TABLE
(
temp_id int,
id int
)
Now, the trick is to populate the employee table with the MERGE statement instead of an INSERT...SELECT because you have to use values from both inserted and source data in the output clause:
MERGE INTO #MainEmployee USING #tEmployeeData AS sourceData ON 1 = 0 -- Always not matched
WHEN NOT MATCHED THEN
INSERT (FirstName, LastName)
VALUES (sourceData.FirstName, sourceData.LastName)
OUTPUT sourceData.EmployeeId, inserted.EmployeeID
INTO #EmployeeidMap (temp_id, id); -- populate the map table
From that point on it's simple, you need to join the data you sent to the #EmployeeidMap to get the actual employeeId:
INSERT INTO #ParentEmployeeDepartment (EmployeeID, DepartmentType)
SELECT Id, DepartmentType
FROM #tEmployeeData
INNER JOIN #EmployeeidMap ON EmployeeID = temp_id
Now you can use the data in #ParentEmployeeDepartment to map the actual values in ParentEmployeeDepartmentID to the data you sent:
Testing the inserts so far
SELECT FirstName,
LastName,
SentData.DepartmentType As [Dept. Type],
DepartmentBuilding As Building,
DepartmentEmployeeLevel As [Emp. Level],
DepartmentTypeAMetadata As [A Meta],
DepartmentTypeBMetadata As [B Meta],
SentData.EmployeeId As TempId, EmpMap.id As [Emp. Id], DeptMap.ParentEmployeeDepartmentID As [Dept. Id]
FROM #tEmployeeData SentData
INNER JOIN #EmployeeidMap EmpMap ON SentData.EmployeeId = temp_id
INNER JOIN #ParentEmployeeDepartment DeptMap ON EmpMap.id = DeptMap.EmployeeID
results:
FirstName LastName Dept. Type Building Emp. Level A Meta B Meta TempId Emp. Id Dept. Id
--------- -------- ---------- -------- ---------- ------ ------ ------ ----------- -----------
Dave_FN Dave_LN B OpenC XII NULL Lab 8 1 1
Joe_FN Joe_LN A 101 IV Tech/IT NULL 7 2 2
Mike_FN Mike_LN B OpenH XII NULL Med 6 3 3
Tom_FN Tom_LN A 101 IV Tech/IT NULL 5 4 4
I'm sure that from this point you can easily figure out the last 2 inserts yourself.