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Devart.Data.MySql Namespace / MySqlDataAdapter Class / UpdateCommand Property
Example

In This Topic
    UpdateCommand Property (MySqlDataAdapter)
    In This Topic
    Gets or sets a MySQL statement used to update records in the data source.
    Syntax
    'Declaration
     
    Public Shadows Property UpdateCommand As MySqlCommand
    public new MySqlCommand UpdateCommand {get; set;}

    Property Value

    A MySqlCommand used during an update operation to update records in the data source that correspond to modified rows in the System.Data.DataSet.
    Remarks
    During an update operation, if UpdateCommand is not set and primary key information is present in the System.Data.DataSet, you can use the MySqlCommandBuilder class to automatically generate UpdateCommand, and additional commands needed to reconcile the System.Data.DataSet to the data source. To do this, set the SelectCommand property of the MySqlDataAdapter. For more information see "Automatically Generated Commands" in the Microsoft .NET Framework SDK documentation.

    Note: If execution of this command returns rows, these rows may be merged with the System.Data.DataSet depending upon how you set the Devart.Common.DbCommandBase.UpdatedRowSource property of the MySqlCommand object.

    Example
    The following example demonstrates how to retrieve and manipulate data using MySqlDataAdapter.
    public void UseDataAdapter(MySqlConnection myConnection)
    {
      MySqlDataAdapter myAdapter = new MySqlDataAdapter("SELECT DeptNo, DName FROM Test.Dept", myConnection);
      myAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
      DataSet myDataSet = new DataSet();
      myAdapter.Fill(myDataSet,"Departments");
      myDataSet.Tables["Departments"].Rows[3]["DName"] = "Researches";
      myAdapter.UpdateCommand = new MySqlCommand("UPDATE Test.Dept SET DeptNo = :DeptNo, DName = :DName " +
          "WHERE DeptNo = :oldDeptNo", myConnection);
      myAdapter.UpdateCommand.Parameters.Add("DeptNo", MySqlType.Int, 0, "DeptNo");
      myAdapter.UpdateCommand.Parameters.Add("DName", MySqlType.VarChar, 15, "DName");
      myAdapter.UpdateCommand.Parameters.Add("oldDeptNo", MySqlType.Int, 0, "DeptNo").SourceVersion = DataRowVersion.Original;
      myAdapter.Update(myDataSet,"Departments"); 
      //Get all data from all tables within the dataset
      foreach(DataTable myTable in myDataSet.Tables)
      {
        foreach(DataRow myRow in myTable.Rows)
        {
          foreach (DataColumn myColumn in myTable.Columns)
          {
            Console.Write(myRow[myColumn]+"\t");
          }
          Console.WriteLine();
        }
        Console.WriteLine();
      }
    }
    Public Sub UseDataAdapter(ByVal myConnection As MySqlConnection)
      Dim myAdapter As MySqlDataAdapter = New MySqlDataAdapter("SELECT DeptNo, DName FROM Test.Dept", myConnection)
      myAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey
      Dim myDataSet As DataSet = New DataSet
      myAdapter.Fill(myDataSet, "Departments")
      myDataSet.Tables("Departments").Rows(3)("DName") = "Researches"
      myAdapter.UpdateCommand = New MySqlCommand("UPDATE Test.Dept SET DeptNo = :DeptNo, DName = :DName " & _
            "WHERE DeptNo = :oldDeptNo", myConnection)
      myAdapter.UpdateCommand.Parameters.Add("DeptNo", MySqlType.Int, 0, "DeptNo")
      myAdapter.UpdateCommand.Parameters.Add("DName", MySqlType.VarChar, 15, "DName")
      myAdapter.UpdateCommand.Parameters.Add("oldDeptNo", MySqlType.Int, 0, "DeptNo").SourceVersion = DataRowVersion.Original
      myAdapter.Update(myDataSet, "Departments")
      Dim myTable As DataTable
      Dim myRow As DataRow
      Dim myColumn As DataColumn
      ' Get all data from all tables within the dataset
      For Each myTable In myDataSet.Tables
        For Each myRow In myTable.Rows
          For Each myColumn In myTable.Columns
            Console.Write(myRow(myColumn) & Chr(9))
          Next myColumn
          Console.WriteLine()
        Next myRow
        Console.WriteLine()
      Next myTable
    End Sub
    Requirements

    Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

    See Also