SqlDataTable Class

In This Topic

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

Syntax

Visual Basic
C#

'Declaration
 
Public Class SqlDataTable 
   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 SqlDataTable : 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 SqlDataTable 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, SqlDataTable replaces SqlConnection, SqlCommand, SqlDataAdapter, and SqlCommandBuilder classes with all-in-one class. When a SqlDataTable 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 SqlDataTable you can avoid explicit creation of SqlConnection and SqlCommand 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.

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

The SqlDataTable 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 SqlDataTable please refer to topic SqlDataTable Advanced Features.

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

This class is available only in Professional Edition.

Example

This sample shows easiness of use of SqlDataTable. The sample creates a SqlDataTable 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()
{
  SqlDataTable myDataTable = new SqlDataTable("SELECT * FROM Test.Dept", 
      "User Id=sa;Server=localhost;Initial Catalog=Test;");
  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 SqlDataTable = New SqlDataTable("SELECT * FROM Test.Dept", _
      "User Id=sa;Server=localhost;Initial Catalog=Test;")
  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.SqlServer.SqlDataTable

Reference

SqlDataTable Members
Devart.Data.SqlServer Namespace
SqlConnection Class
SqlDataReader Class

Send Feedback