Question

I have a software system that I am ‘trying’ to maintain and upgrade. I have had no formal c# training and only 1 class of sql. Most of my limited experience is with Java, C++. We are using MSSQL 2005.

I have a query run in c# that gets a dataset with 1 table and 15 or so columns. The number of rows returned is different each time it is ran. The first column is the storeid. I need to separate records by storeid in to their own datatable. Once I have that there is an existing method for sending it out to a CSV file.

So far I have found Datatable.Select, order it by storeid.

One option would be pulling all the unique storeid’s from the dataset and putting them into an array. Then I could query based on existing storeid’s and copy or move those rows to a new datatable using a foreach.

If someone could just point me in the right direction it would be much appreciated.

Mark

Answer 1

Certainly a few ways to do this, but something like this should work:

        DataSet dsMain = GetMyMainDataSet();
        DataSet dsTablesById = new DataSet();

        foreach (DataRow row in dsMain.Tables[0].Rows)
        {
            string storeId = row["storeid"].ToString();
            if (!dsTablesById.Tables.Contains(storeId))
            {
                dsTablesById.Tables.Add(storeId);
                foreach (DataColumn col in dsMain.Tables[0].Columns)
                {
                    dsTablesById.Tables[storeId].Columns.Add(col.ColumnName, col.DataType);
                }
            }
            dsTablesById.Tables[storeId].Rows.Add(row.ItemArray);
            dsTablesById.Tables[storeId].AcceptChanges();
        }

dsTablesById would contain all of your datatables, each named by your distinct values of storeid.