How to: Update Records in a Database

You can use the TableAdapter.Update method to update (edit) records in a database. The TableAdapter.Update method provides several overloads that perform different operations depending on the parameters passed in. It is important to understand the results of calling these different method signatures.

The following table describes the behavior of the various TableAdapter.Update methods:

You typically use the TableAdapter.Update method that takes a DataSet, DataTable, or DataRow(s) when your application uses datasets exclusively to store data.

You typically use the TableAdapter.Update method that takes column values when your application uses objects to store data.

If your TableAdapter does not have an Update method that takes column values, then it means that either the TableAdapter is configured to use stored procedures or its GenerateDBDirectMethods property is set to false. Try setting the TableAdapter's GenerateDBDirectMethods property to true from within the Dataset Designer and then save the dataset to regenerate the TableAdapter. If the TableAdapter still does not have an Update method that takes column values, then the table probably does not provide enough schema information to distinguish between individual rows (for example, no primary key is set on the table).

Update Existing Records Using TableAdapters

TableAdapters provide different ways to update records in a database depending on the requirements of your application.

If your application uses datasets to store data, then you can simply update the records in the desired DataTable and then call the TableAdapter.Update method and pass in either the DataSet, DataTable, DataRow, or array of DataRows. The table above describes the different Update methods.

To update records in a database with the TableAdapter.Update method that takes DataSet, DataTable, DataRow, or DataRows()

1. Edit records in the desired DataTable by directly editing the DataRow in the DataTable. For more information, see How to: Edit Rows in a DataTable.

2. After the rows are edited in the DataTable, call the TableAdapter.Update method. You can control the amount of data to update by passing in either an entire DataSet, a DataTable, an array of DataRows, or a single DataRow.

   The following code shows how to edit a record in a DataTable and then call the TableAdapter.Update method to save the changes to the database. (This example uses the Northwind database Region table.)

   ' Locate the row you want to update. 
   Dim regionRow As NorthwindDataSet.RegionRow
   regionRow = NorthwindDataSet._Region.FindByRegionID(1)
   
   ' Assign the new value to the desired column.
   regionRow.RegionDescription = "East" 
   
   ' Save the updated row to the database 
   Me.RegionTableAdapter.Update(Me.NorthwindDataSet._Region)
   

   // Locate the row you want to update.
   NorthwindDataSet.RegionRow regionRow;
   regionRow = northwindDataSet.Region.FindByRegionID(1);
   
   // Assign the new value to the desired column.
   regionRow.RegionDescription = "East";
   
   // Save the updated row to the database. 
   this.regionTableAdapter.Update(this.northwindDataSet.Region);
   

If your application uses objects to store the data in your application, you can use the TableAdapter's DBDirect methods to send data from your objects directly to the database. These methods allow you to pass individual values for each column as method parameters. Calling this method updates an existing record in the database with the column values passed into the method.

The following procedure uses the Northwind Region table as an example.

To update records in a database using the TableAdapter.Update method that takes column values

• Call the TableAdapter's Update method, passing in the new and original values for each column as parameters.

  Note

  If you do not have an instance available, instantiate the TableAdapter you want to use.

  Dim regionTableAdapter As New NorthwindDataSetTableAdapters.RegionTableAdapter
  
  regionTableAdapter.Update(1, "East", 1, "Eastern")
  

  NorthwindDataSetTableAdapters.RegionTableAdapter regionTableAdapter = 
      new NorthwindDataSetTableAdapters.RegionTableAdapter();
  
  regionTableAdapter.Update(1, "East", 1, "Eastern");
  

Update Records Using Command Objects

The following example updates existing records directly in a database using command objects. For more information on using command objects to execute commands and stored procedures, see Fetching Data into Your Application.

The following procedure uses the Northwind Region table as an example.

To update existing records in a database using command objects

• Create a new command object; set its Connection, CommandType, and CommandText properties; and then open a connection and execute the command.

  Dim sqlConnection1 As New System.Data.SqlClient.SqlConnection("YOUR CONNECTION STRING")
  
  Dim cmd As New System.Data.SqlClient.SqlCommand
  cmd.CommandType = System.Data.CommandType.Text
  cmd.CommandText = "UPDATE Region SET [RegionDescription] = @RegionDescription WHERE [RegionID] = @RegionID"
  cmd.Parameters.AddWithValue("@RegionDescription", "East")
  cmd.Parameters.AddWithValue("@RegionID", "1")
  cmd.Connection = sqlConnection1
  
  sqlConnection1.Open()
  cmd.ExecuteNonQuery()
  sqlConnection1.Close()
  

  System.Data.SqlClient.SqlConnection sqlConnection1 = 
      new System.Data.SqlClient.SqlConnection("YOUR CONNECTION STRING");
  
  System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
  cmd.CommandType = System.Data.CommandType.Text;
  cmd.CommandText = "UPDATE Region SET [RegionDescription] = @RegionDescription WHERE [RegionID] = @RegionID";
  cmd.Parameters.AddWithValue("@RegionDescription", "East");
  cmd.Parameters.AddWithValue("@RegionID", "1");
  cmd.Connection = sqlConnection1;
  
  sqlConnection1.Open();
  cmd.ExecuteNonQuery();
  sqlConnection1.Close();
  

Security

You must have access to the database you are trying to connect to, as well as permission to update records in the desired table.

See Also

Tasks

How to: Delete Records in a Database

How to: Insert New Records into a Database

How to: Save Data from an Object to a Database

Concepts

TableAdapter Overview

Preparing Your Application to Receive Data

Fetching Data into Your Application

Binding Controls to Data in Visual Studio

Editing Data in Your Application

Validating Data

Saving Data

Other Resources

Overview of Data Applications in Visual Studio

Connecting to Data in Visual Studio