UpdateCommand Property (PgSqlDataAdapter)

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

During an update operation, if UpdateCommand is not set and primary key information is present in the System.Data.DataSet, you can use the PgSqlCommandBuilder 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 PgSqlDataAdapter. 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 PgSqlCommand object.

Example

The following example demonstrates how to retrieve and manipulate data using PgSqlDataAdapter.

csharp

public void UseDataAdapter(PgSqlConnection pgConnection)
{
  PgSqlDataAdapter myAdapter = new PgSqlDataAdapter("SELECT DeptNo, DName FROM Test.Dept", pgConnection);
  myAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
  DataSet myDataSet = new DataSet();
  myAdapter.Fill(myDataSet,"Departments");
  myDataSet.Tables["Departments"].Rows[3]["DName"] = "Researches";
  myAdapter.UpdateCommand = new PgSqlCommand("UPDATE Test.Dept SET DeptNo = :DeptNo, DName = :DName " +
      "WHERE DeptNo = :oldDeptNo", pgConnection);
  myAdapter.UpdateCommand.Parameters.Add("DeptNo", PgSqlType.Int, 0, "DeptNo");
  myAdapter.UpdateCommand.Parameters.Add("DName", PgSqlType.VarChar, 15, "DName");
  myAdapter.UpdateCommand.Parameters.Add("oldDeptNo", PgSqlType.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();
  }
}

Visual Basic

Public Sub UseDataAdapter(ByVal pgConnection As PgSqlConnection)
  Dim myAdapter As PgSqlDataAdapter = New PgSqlDataAdapter("SELECT DeptNo, DName FROM Test.Dept", pgConnection)
  myAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey
  Dim myDataSet As DataSet = New DataSet
  myAdapter.Fill(myDataSet, "Departments")
  myDataSet.Tables("Departments").Rows(3)("DName") = "Researches"
  myAdapter.UpdateCommand = New PgSqlCommand("UPDATE Test.Dept SET DeptNo = :DeptNo, DName = :DName " & _
        "WHERE DeptNo = :oldDeptNo", pgConnection)
  myAdapter.UpdateCommand.Parameters.Add("DeptNo", PgSqlType.Int, 0, "DeptNo")
  myAdapter.UpdateCommand.Parameters.Add("DName", PgSqlType.VarChar, 15, "DName")
  myAdapter.UpdateCommand.Parameters.Add("oldDeptNo", PgSqlType.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

Reference

PgSqlDataAdapter Class
PgSqlDataAdapter Members
DeleteCommand Property
InsertCommand Property
SelectCommand Property

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