ReadComplete Method

In This Topic

Fills a row with data not fetched in the initial fill operation.

Syntax

Visual Basic
C#

'Declaration
 
Public Sub ReadComplete( _
   ByVal row As DataRow _
)

public void ReadComplete( 
   DataRow row
)

Parameters

row: Row to read out.

Remarks

This method is designed to optimize working with LOBs and other big-size server types. It allows you to execute initial fill with only a subset of fields (e.g. all except LOBs). Then you can can create missing columns manually and call ReadComplete for the row you want to get data for.

Example

The following example demonstrates how to use the ReadComplete property.

csharp

static void UseDataTable(DbDataTable myDataTable, DbConnection myConnection) {

  myDataTable.Connection = myConnection;
  myDataTable.SelectCommand = myConnection.CreateCommand();
  myDataTable.SelectCommand.CommandText = "SELECT DEPTNO FROM Dept";

  System.Data.DataColumn column_DEPTNO = new System.Data.DataColumn();
  System.Data.DataColumn column_DNAME = new System.Data.DataColumn();
  System.Data.DataColumn column_LOC = new System.Data.DataColumn();
  column_DEPTNO.ColumnName = "DEPTNO";
  column_DEPTNO.DataType = typeof(int);
  column_LOC.ColumnName = "LOC";
  column_DEPTNO.DataType = typeof(string);
  myDataTable.Columns.AddRange(new System.Data.DataColumn[] {column_DEPTNO, column_DNAME, column_LOC});

  myDataTable.FetchAll = true;
  myDataTable.Open();

  Console.Write("DEPTNO column is loaded");

  myDataTable.ReadComplete(myDataTable.Rows[0]);
  
  Console.Write("DEPTNO and LOC columns are loaded");
}

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 DEPTNO FROM Dept"
  Dim column1 As New DataColumn
  Dim column2 As New DataColumn
  Dim column3 As New DataColumn
  column1.ColumnName = "DEPTNO"
  column1.DataType = GetType(Integer)
  column3.ColumnName = "LOC"
  column1.DataType = GetType(String)
  myDataTable.Columns.AddRange(New DataColumn() {column1, column2, column3})
  myDataTable.FetchAll = True
  myDataTable.Open()
  Console.Write("DEPTNO column is loaded")
  myDataTable.ReadComplete(myDataTable.Rows.Item(0))
  Console.Write("DEPTNO and LOC columns are loaded")
End Sub

Reference

DbDataTable Class
DbDataTable Members

Send Feedback