UpdateCommand Property (PgSqlDataTable)

In This Topic

Gets or sets a PostgreSQL statement used to update records in the data source.

Syntax

Visual Basic
C#

'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.

csharp

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;
  }
}

Visual Basic

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

Reference

PgSqlDataTable Class
PgSqlDataTable Members
DeleteCommand Property
InsertCommand Property
SelectCommand Property

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