UpdatingKeyFields Property (DbDataTable)

In This Topic

Gets or sets string containing list of key field names separated by semicolon. They are used to generate update commands.

Syntax

Visual Basic
C#

'Declaration
 
Public Property UpdatingKeyFields As String

public string UpdatingKeyFields {get; set;}

Property Value

The string containing list of key field names separated by semicolon.

Example

The following example demonstrates how to use the UpdatingKeyFields property.

csharp

static void UseDataTable(DbDataTable myDataTable, DbConnection myConnection) {

  myDataTable.Connection = myConnection;
  myDataTable.SelectCommand = myConnection.CreateCommand();
  myDataTable.SelectCommand.CommandText = "SELECT e.EMPNO, e.ENAME, e.JOB, d.DNAME FROM Dept d, Emp e where d.Deptno = e.Deptno";

  myDataTable.FetchAll = true;
  myDataTable.CachedUpdates = false;
  myDataTable.UpdatingTable = "Emp";
  myDataTable.UpdatingKeyFields = "EMPNO";
  myDataTable.UpdatingFields = "EMPNO;ENAME;JOB";

  myDataTable.Open();

  DataRow row = myDataTable.Rows[0];
  row[myDataTable.Columns["ENAME"]] = "John Smith";

  myDataTable.Update();
  myDataTable.Close();
}

Visual Basic

Private Shared Sub UseDataTable(ByVal myDataTable As DbDataTable, ByVal myConnection As DbConnection)
  myDataTable.Connection = myConnection
  myDataTable.SelectCommand = myConnection.CreateCommand
  myDataTable.SelectCommand.CommandText = "SELECT e.EMPNO, e.ENAME, e.JOB, d.DNAME FROM Dept d, Emp e where d.Deptno = e.Deptno"
  myDataTable.FetchAll = True
  myDataTable.CachedUpdates = False
  myDataTable.UpdatingTable = "Emp"
  myDataTable.UpdatingKeyFields = "EMPNO"
  myDataTable.UpdatingFields = "EMPNO;ENAME;JOB"
  myDataTable.Open()
  Dim row1 As DataRow = myDataTable.Rows.Item(0)
  row1.Item(myDataTable.Columns.Item("ENAME")) = "John Smith"
  myDataTable.Update()
  myDataTable.Close()
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

Reference

DbDataTable Class
DbDataTable Members
UpdatingTable Property
UpdatingFields Property

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