DB2DataTable Class

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Represents a single object that provides all of the functionality needed to retrieve and manipulate data from a DB2 data source.

Syntax

Visual Basic
C#


'Declaration Public Class DB2DataTable Inherits Devart.Common.DbDataTable Implements System.ComponentModel.IComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitialize, System.ComponentModel.ISupportInitializeNotification, System.IDisposable, System.IServiceProvider, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

'Declaration
 
Public Class DB2DataTable 
   Inherits Devart.Common.DbDataTable
   Implements System.ComponentModel.IComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitialize, System.ComponentModel.ISupportInitializeNotification, System.IDisposable, System.IServiceProvider, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable


public class DB2DataTable : Devart.Common.DbDataTable, System.ComponentModel.IComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitialize, System.ComponentModel.ISupportInitializeNotification, System.IDisposable, System.IServiceProvider, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

public class DB2DataTable : Devart.Common.DbDataTable, System.ComponentModel.IComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitialize, System.ComponentModel.ISupportInitializeNotification, System.IDisposable, System.IServiceProvider, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

Remarks

The DB2DataTable class extends the Devart.Common.DbDataTable class to provide a single object that can be used to access and update data from a data source. Actually, DB2DataTable replaces DB2Connection, DB2Command, DB2DataAdapter, and DB2CommandBuilder classes with all-in-one class. When a DB2DataTable object is created, the default values of its constituent parts are set to reasonable defaults, meaning that the programmer can create a single object and immediately use it to retrieve and manipulate data from a data source.

By using DB2DataTable you can avoid explicit creation of DB2Connection and DB2Command objects. When appropriate form of constructor is used, these objects are created automatically when you retrieve data from a data source. It allows you to cut down the size of the written code.

DB2DataTable allows you to automate loading of subsets of data either by selecting Devart.Common.DbTable.StartRecord and MaxRecords properties or by using Fill or FillPage methods that support passing parameter values into the query text.

The DB2DataTable class is designed to employ both connected and disconnected data access models. It also provides functionality for asynchronous fill operations.

The DB2DataTable class can be fully adjusted at design-time. You may retrieve data at design-time from a data source by setting Devart.Common.DbTable.Active property to true.

For more information on advanced features of DB2DataTable please refer to topic DB2DataTable Advanced Features.

This class supports cross-form data binding with the InterForm Technology.

Example

This sample shows easiness of use of DB2DataTable. The sample creates a DB2DataTable object, passing it SQL query text and connection string, retrieves data from a table and modifies it. Content of the table is printed to console then. Notice that no other component needs to be created by programmer.

csharp


public void UseDataTable() { DB2DataTable myDataTable = new DB2DataTable("SELECT * FROM Dept", "user id=db2admin;server=db2;database=SAMPLE;"); try { myDataTable.FetchAll = true; myDataTable.Active = true; myDataTable.Rows[3]["DName"] = "Researches"; Console.WriteLine(myDataTable.Update()+" rows updated."); foreach(DataRow myRow in myDataTable.Rows) { foreach(DataColumn myCol in myDataTable.Columns) { Console.Write(myRow[myCol]+"\t"); } Console.WriteLine(); } } finally { myDataTable.Active = false; } }

public void UseDataTable()
{
  DB2DataTable myDataTable = new DB2DataTable("SELECT * FROM Dept", 
      "user id=db2admin;server=db2;database=SAMPLE;");
  try
  {
    myDataTable.FetchAll = true;
        myDataTable.Active = true;
    myDataTable.Rows[3]["DName"] = "Researches";
    Console.WriteLine(myDataTable.Update()+" rows updated.");
    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() Dim myDataTable As DB2DataTable = New DB2DataTable("SELECT * FROM Dept", _ "user id=db2admin;server=db2;database=SAMPLE;") Try myDataTable.FetchAll = True myDataTable.Active = True myDataTable.Rows(3)("DName") = "Researches" Console.WriteLine(myDataTable.Update() & " rows updated.") 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

Public Sub UseDataTable()
  Dim myDataTable As DB2DataTable = New DB2DataTable("SELECT * FROM Dept", _
      "user id=db2admin;server=db2;database=SAMPLE;")
  Try
    myDataTable.FetchAll = True
        myDataTable.Active = True
    myDataTable.Rows(3)("DName") = "Researches"
    Console.WriteLine(myDataTable.Update() & " rows updated.")
    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

Inheritance Hierarchy

System.Object
   System.ComponentModel.MarshalByValueComponent
      System.Data.DataTable
         Devart.Common.DbDataTable
            Devart.Data.DB2.DB2DataTable

Reference

DB2DataTable Members
Devart.Data.DB2 Namespace
DB2Connection Class
DB2DataReader Class

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