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c#sqldatatablesqlbulkcopy
user2545743
user2545743

Reputation: 799

Mapping columns in a DataTable to a SQL table with SqlBulkCopy

I would like to know how I can map columns in a database table to the datatable in c# before adding the data to the database.

using (SqlBulkCopy s = new SqlBulkCopy(conn))
{
    s.DestinationTableName = destination;
    s.WriteToServer(Ads_api_ReportData);
}

Upvotes: 37

Views: 98230

Answers (6)

Hugo Nava Kopp
Hugo Nava Kopp

Reputation: 3064

It might be useful to know that if the columns in the source query (or table) and the target table have exactly the same name and are in the exact same order, then there is no need to write out the mappings explicitly, because SqlBulkCopy will create a default mapping with this default order.

Upvotes: 15

Mohsin Khan
Mohsin Khan

Reputation: 215

You can use below code

                using (OleDbConnection con = new OleDbConnection(excelCS))
                {
                    OleDbCommand cmd = new OleDbCommand("select * from [Sheet1$]", con);
                    con.Open();
                    // Create DbDataReader to Data Worksheet  
                    DbDataReader dr = cmd.ExecuteReader();
                    // SQL Server Connection String  
                    //string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
                    string CS = objCommon.TestConnection;
                    // Bulk Copy to SQL Server   
                    SqlBulkCopy bulkInsert = new SqlBulkCopy(CS);

                    bulkInsert.ColumnMappings.Add("Kcode", "Kcode");
                    bulkInsert.ColumnMappings.Add("MDMCode", "MDMCode");

                    bulkInsert.DestinationTableName = "tbl_MDMKcodeMapping";
                    bulkInsert.WriteToServer(dr);
                    
                    lblMessage.Text = "Your file uploaded successfully";
                    lblMessage.ForeColor = System.Drawing.Color.Green;
                }

Please note that in

  bulkInsert.ColumnMappings.Add("Kcode", "Kcode");

The first parameter should be your Excel column name and the second parameter should be your SQL table column name

Upvotes: 0

Evan M
Evan M

Reputation: 2611

This became such a common task that I wrote this helper for it: 

public static void AutoMapColumns(SqlBulkCopy sbc, DataTable dt)
{
    foreach (DataColumn column in dt.Columns)
    {
        sbc.ColumnMappings.Add(column.ColumnName, column.ColumnName);
    }
}

Since I was creating the DataTable myself, I named its columns the same as the SQL table.

Upvotes: 42

Laxmikant
Laxmikant

Reputation: 588

The method Add on ColumnMappings collection allows you to map your columns from source table to destination table. The method ColumnMappings.Add accepts four different ways to map your columns.

SQLBulkCopy is very much strict on data type of both the columns which you have to consider while adding it to ColumnMappings collection

Upvotes: 1

StackTrace
StackTrace

Reputation: 9416

You probably need some thing like 

 public void BatchBulkCopy(DataTable dataTable, string DestinationTbl, int batchSize)
{
    // Get the DataTable 
    DataTable dtInsertRows = dataTable;

    using (SqlBulkCopy sbc = new SqlBulkCopy(connectionString, SqlBulkCopyOptions.KeepIdentity))
    {
        sbc.DestinationTableName = DestinationTbl;

        // Number of records to be processed in one go
        sbc.BatchSize = batchSize;

        // Add your column mappings here
        sbc.ColumnMappings.Add("field1","field3");
        sbc.ColumnMappings.Add("foo","bar");

        // Finally write to server
        sbc.WriteToServer(dtInsertRows);
    }    
}

Ref: How to use SqlBulkCopyColumnMappingCollection? . .

Seel also http://www.codeproject.com/Articles/18418/Transferring-Data-Using-SqlBulkCopy

Upvotes: 50

Ben Gulapa
Ben Gulapa

Reputation: 1619

Use the ColumnMappings:

s.ColumnMappings.Add("Name", "Name");
s.ColumnMappings.Add("Address", "Address");

Upvotes: 2

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