How to Update SQL Server Table With Data From Other Source (DataTable)

asp.net c# datatable sqlbulkcopy sql-server-2005

Question

I have a DataTable which is generated from .xls table.

I would like to store this DataTable into an existing table in SQL Server database.

I use SqlBulkCopy to store rows which have unique PK.

Problem is, I also have other rows which have same PK as SQL Server table but contain cells with different value compared to SQL Server table.

In short:

Let's say in my DataTable I have a row like this:

id(PK) | name | number

005 | abc | 123

006 | lge | 122

For my SQL server I have sth like this;

id(PK) | name | number

004 | cbs | 345

005 | lks | 122

Now you see the row 006 can be uploaded straight away into SQL Server using SqlBulkCopy. On the other hand the row 005 can't be inserted using it since SQL server table contains row with identical PK.

Now I tried to manually extract the row. Extract each single cell into an ArrayList then generate an UPDATE Table statement afterwards. However this method seems to be unfeasible as I have so many rows to process.

I am looking for a better method to achieve this goal.

Any help is appreciated.

Thank's

Accepted Answer

Use the below code:

C# Side code for reading data from DataTable and preparing the XML data:

DataTable dt = new DataTable();
StringBuilder sb = new StringBuilder();

sb.Append("<R>");
for (int i = 0; i < dt.Rows.Count; i++)
{
    sb.Append("<C><ID>" + dt.Rows[0].ToString() + "</ID>");
    sb.Append("<N>" + dt.Rows[1].ToString() + "</N>");
    sb.Append("<I>" + dt.Rows[2].ToString() + "</I></C>");
}

sb.Append("</R>");

///pass XML string to DB side
///
//sb.ToString(); //here u get all data from data table as xml format

Database side Stored Procedure (you will need to update your table name):

CREATE PROCEDURE dbo.UpdateData 
    -- Add the parameters for the stored procedure here
    @data       XML
AS
BEGIN
    SET NOCOUNT ON;

    -- keep data into temp table
    create table #tmp_data (id nchar(2),name varchar(20), number int)

    DECLARE @XMLDocPointer INT  
    EXEC sp_xml_preparedocument @XMLDocPointer OUTPUT, @DATA

    INSERT INTO #tmp_data(id,name,number)
    SELECT  ID,N,I
    FROM OPENXML(@XMLDocPointer,'/R/C',2)
    WITH(
            ID  nchar(30),
            N   VARCHAR(20),
            I   int
        )

    EXEC sp_xml_removedocument @XMLDocPointer

    begin tran
        -------------------INSERT not existing ones
        INSERT INTO TABLE (id,name,number)
        SELECT id,name,number
        FROM #tmp_data
        WHERE NOT EXISTS
        (
            SELECT 1
            FROM TABLE
            WHERE ID = #tmp_data.ID
        )

        --- update existing ones
        UPDATE  TABLE
        SET name = #tmp_data.name, number = #tmp_data.number
        FROM #tmp_data
        WHERE #tmp_data.id = TABLE.id

        commit tran

    if(@@error <> 0)
        rollback tran

END


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Is this KB legal? Yes, learn why