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Devart.Data.PostgreSql Namespace / PgSqlDataTable Class / UpdateCommand Property
Example

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

    Property Value

    A PgSqlCommand used during an update operation to update records in the data source that correspond to modified rows in the System.Data.DataSet.
    Remarks
    UpdateCommand uses its own Connection if it is created. Otherwise UpdateCommand uses Connection.
    Example
    This sample shows how to modify and display data using PgSqlDataTable.
    public void UseDataTable(PgSqlConnection pgConnection)
    {
      PgSqlDataTable myDataTable = new PgSqlDataTable("SELECT * FROM Test.Dept", pgConnection);
      try
      {
        myDataTable.Active = true;
        myDataTable.Rows[3]["DName"] = "Researches";
        myDataTable.UpdateCommand = new PgSqlCommand("UPDATE Test.Dept SET DeptNo = :DeptNo, DName = :DName, Loc = 'Modified' " +
            "WHERE DeptNo = :oldDeptNo", pgConnection);
        myDataTable.UpdateCommand.Parameters.Add("DeptNo", PgSqlType.Int, 0, "DeptNo");
        myDataTable.UpdateCommand.Parameters.Add("DName", PgSqlType.VarChar, 15, "DName");
        myDataTable.UpdateCommand.Parameters.Add("oldDeptNo", PgSqlType.Int, 0, "DeptNo").SourceVersion = DataRowVersion.Original;
        Console.WriteLine(myDataTable.Update()+" rows updated.");
        myDataTable.Active = false;
        //Refresh the table to check custom updates
        myDataTable.Active = true;                  
        foreach(DataRow myRow in myDataTable.Rows)
        {
          foreach(DataColumn myCol in myDataTable.Columns)
          {
            Console.Write(myRow[myCol]+"\t");
          }
          Console.WriteLine();
        }
      }
      finally
      {
        myDataTable.Active = false;
      }
    }
    Public Sub UseDataTable(ByVal pgConnection As PgSqlConnection)
      Dim myDataTable As PgSqlDataTable = New PgSqlDataTable("SELECT * FROM Test.Dept", pgConnection)
      Try
        myDataTable.Active = True
        myDataTable.Rows(3)("DName") = "Researches"
        myDataTable.UpdateCommand = New PgSqlCommand("UPDATE Test.Dept SET DeptNo = :DeptNo, DName = :DName, Loc='Modified' " & _
            "WHERE DeptNo = :oldDeptNo", pgConnection)
        myDataTable.UpdateCommand.Parameters.Add("DeptNo", PgSqlType.Int, 0, "DeptNo")
        myDataTable.UpdateCommand.Parameters.Add("DName", PgSqlType.VarChar, 15, "DName")
        myDataTable.UpdateCommand.Parameters.Add("oldDeptNo", PgSqlType.Int, 0, "DeptNo").SourceVersion = DataRowVersion.Original
        Console.WriteLine(myDataTable.Update() & " rows updated.")
        myDataTable.Active = False
        ' Refresh the table to check custom updates
        myDataTable.Active = True
        Dim myRow As DataRow
        Dim myCol As DataColumn
        For Each myRow In myDataTable.Rows
          For Each myCol In myDataTable.Columns
            Console.Write(myRow(myCol) & Chr(9))
          Next myCol
          Console.WriteLine()
        Next myRow
      Finally
        myDataTable.Active = False
      End Try
    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