Matching Primary key from Excel to DB Column before import

Question

Hello Experts, 
I am trying to achieve the task related with updates into my destination table via store procedure using dynamic sql. Basically I am importing the
excel file into sql server.
For further step, I want to update only the records that do not exist already in the table with reference to primary key. For this the user will provide
as an input for procedure the column (or columns) that compose the primary key in excel.
Example of EXEC command to run the store Procedure
EXEC
[ImportExcelFile_Error_Handling]
'D:\test\test.xlsx','sheet1','testDB',
'create','[Test Column1]’
So in this case the [Test Column1] from excel contains now my Primary Key and if I execute my procedure then code should check the values of the
[Test Column1] in the existing table in database, against the
[Test Column1]
in database.  
If [Test Column1]
value match with db
[Test Column1]
then skip rows and if not match then insert row entry.
Below is my code, which needs to be update.
if
@TypeOfUpdate='Update'
Begin
declare
@PrimaryLeyColumn NVARCHAR(max)
set
@PrimaryLeyColumn=''
exec('Insert into ['
+ @DestinationTable
+ '] select * from openrowset(''Microsoft.ACE.OLEDB.12.0'', ''Excel 12.0;HDR=YES;IMEX=1;Database='
+ @TABLENAME
+ ''', ' +
''' select * from '+@SourceSheet
+ ''')')
end
 thanks in advance.
Looking for support.
SharePoint_Consultant_EMEA

Answer 1

Hello,
Here is my complete code:
--------------------Declaring variables------------------------------
CREATE
PROCEDURE [dbo].[ImportExcelFile_Update_Error_Handling]     
(@TABLENAME
varchar(1000)
,@SourceSheet
varchar (100)
,@DestinationTable
varchar (100)
,@TypeOfUpdate
varchar (100)
,@PrimaryLeyColumn
VARCHAR(255))
as
declare
@retval int
--Remaing Value
EXEC
master..xp_fileexist
@TABLENAME,
@retval output
-- check if file exists
if
@retval = 0
begin
print 'file does not exists.'
return
end
if
@SourceSheet is
null or @SourceSheet
= ''
set @SourceSheet
= '[Sheet1$]' -- assume that the Sheet name on excel file is the default name
else
set @SourceSheet
= '[' +
ltrim(rtrim(@SourceSheet))
+ '$]'
if
@DestinationTable is
null or
@DestinationTable =
set @DestinationTable
= substring(@SourceSheet, 2,
len(@SourceSheet)
- 3)
+ convert(varchar,
getdate(), 126)
if
@TypeOfUpdate='Update'
Begin
Begin
try
--if @PrimaryLeyColumn =''
set
@PrimaryLeyColumn =
'[]'--here i think need to add the value or updates
exec('Insert into ['
+ @DestinationTable
+ '] select * from openrowset(''Microsoft.ACE.OLEDB.12.0'', ''Excel 12.0;HDR=YES;IMEX=1;Database='
+ @TABLENAME
+ ''', ' +
''' select * from '+@SourceSheet
+ ''')t WHERE NOT EXISTS (SELECT 1 FROM ['
+ @DestinationTable
+ '] WHERE ['
+ @PrimaryLeyColumn
+ '] = t.[' +
@PrimaryLeyColumn +
declare
@Appendcount INT
declare
@SQLStringCount nvarchar(500);
declare
@ParamDef nvarchar(500);
declare
@TabName nvarchar(500);
SET
@SQLStringCount =
N'SELECT @COUNT=COUNT(1) FROM '+
@DestinationTable;
SET
@ParamDef =
N'@TABLE varchar(30),@COUNT BIGINT OUTPUT';
EXECUTE
sp_executesql @SQLStringCount,
@ParamDef ,@Table=@TabName,
@COUNT=@Appendcount
OUTPUT;
--Getting the rowcount as a output parameter from the sp_executesql.
if
@Appendcount != 0
PRINT
'Database is "Updated" with total number of Records= '
+ Cast(@Appendcount
AS VARCHAR(200))
end
try
Begin
Catch
if @DestinationTable is null or @DestinationTable = ''
DECLARE
@ErrorNumberUT INT
= ERROR_NUMBER();
DECLARE
@ErrorMessageofUpdateTable
NVARCHAR(max)
= ERROR_MESSAGE();
PRINT
'Error, Table not exists in the database'
PRINT
'Actual error number: ' +
CAST(@ErrorNumberUT
AS VARCHAR(10));
PRINT
'Actual Error Message: '
+ CAST(@ErrorMessageofUpdateTable
AS VARCHAR(max));
end
Catch
end
To execute this code I am using this script
EXEC
[ImportExcelFile_Update_Error_Handling]
'D:\TestFiles\Test_Updates.xlsx','sheet1','Error_Handing','update','[SUPLR_DUNS_NBR]';
[SUPLR_DUNS_NBR] is the column where I have "ID to match" with new and old content in my excel and if this content same in my sql table then skip else insert the row.
Any support in this would ge really helpful to achive my tasks goal. 
thanks
SharePoint_Consultant_EMEA