Question

I have a sitution where I need to import records from a flat file into several tables, making sure to keep tab on the resulting Primary keys for each row insert, for insertion into the next table.

Example

For each Row in FlatFile_Import 

    RowID = INSERT Row_ELEMENTS1 INTO TABLEA

    PROPID = INSERT ROW_ELEMENTS2 & ROWID INTO TABLEB

    ATTRID = INSERT ROW_ELEMENTS3 & PROPID INTO TABLEC

    . . .  ..
NEXt 

I have a staging table, StagingTable filled with data from an excel file. Each row of the data in StagingTable contains records that need to be inserted into various tables(TableA, TableB, and TableC). Now when I insert the columns from each row that go to TableA, I need to retrieve the created/generated primarykey, KeyA Next I select to insert the columns from StagingTable row that should go into TableB, along with KeyA, and get back KeyB and so on and so forth.

How can I best handle this requirement please?

Answer 1

This solution assumes you can Modify the TableA and TableB to add a column.

Load the Data into StagingTable .Staging table should have StageRecordID ( identity).
Then you need to modify the TableA to add a colum StageRecordID. Store the StageRecordId in this column when populating TABLEA.
WHEN populating TableB join the StagingTable with TableA to get RowID of TableA
similarly Store StageRecordID in TableB aswell so that you can join to it When Populating TABLEC

Edit:some example code

--Assuming TableA is 

/*
CREATE TABLE TABLEA
{
RowID INT IDENTITY(1,1)
,Row_ELEMENTS1 varchar(25)
,StageRecordID int  ---you need to add this column to the Table
}
*/
INSERT INTO TABLEA
(
Row_ELEMENTS1,
StageRecordID
)
   SELECT Col1 AS Row_ELEMENTS1,StageRecordID FROM StaginTable


--NOW assuming TABLEB is 

/*
CREATE TABLE TABLEA
{
PROPID  INT IDENTITY(1,1)
,Row_ELEMENTS2 varchar(25)
,ROWID 
,StageRecordID int ---you need to add this column to the Table
}
*/
INSERT INTO TABLEB
(
Row_ELEMENTS2,
ROWID,
StageRecordID
   )
    SELECT a.Col2 AS Row_ELEMENTS2, b.ROWID ,a.StageRecordID FROM StaginTable AS a
    INNER JOIN TABLEA AS b
    ON a.StageRecordID=b.StageRecordID