rofans91 rofans91 - 6 days ago 5
ASP.NET (C#) Question

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

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

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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