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SQL Anywhere 10.0.1 » UltraLite - .NET Programming » UltraLite .NET 2.0 API Reference

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ULCommandBuilder class


Automatically generates single-table commands used to reconcile changes made to a System.Data.DataSet with the associated database.

Syntax

Visual Basic

Public Class ULCommandBuilder
Inherits DbCommandBuilder

C#

public class ULCommandBuilder : DbCommandBuilder

Remarks

The ULDataAdapter does not automatically generate the SQL statements required to reconcile changes made to a System.Data.DataSet with the associated data source. However, you can create a ULCommandBuilder object to automatically generate SQL statements for single-table updates if you set the SelectCommand property of the ULDataAdapter. Then, any additional SQL statements that you do not set are generated by the ULCommandBuilder.

Inherits: System.ComponentModel.Component

Implements: System.IDisposable

Example

The following example uses the ULCommand, along with ULDataAdapter and ULConnection, to select rows from a data source. The example is passed a connection string, a query string that is a SQL SELECT statement, and a string that is the name of the database table. The example then creates a ULCommandBuilder.

' Visual Basic
Public Shared Function SelectULRows(ByVal connectionString As String, _
    ByVal queryString As String, ByVal tableName As String)

    Dim connection As ULConnection = New ULConnection(connectionString)
    Dim adapter As ULDataAdapter = New ULDataAdapter()

       adapter.SelectCommand = New ULCommand(queryString, connection)

       Dim builder As ULCommandBuilder = New ULCommandBuilder(adapter)

    connection.Open()

    Dim dataSet As DataSet = New DataSet()
    adapter.Fill(dataSet, tableName)

    'code to modify data in DataSet here

    'Without the ULCommandBuilder this line would fail
    adapter.Update(dataSet, tableName)

    Return dataSet

End Function

// C#
public static DataSet SelectULRows(string connectionString,
    string queryString, string tableName)
{
    using (ULConnection connection = new ULConnection(connectionString))
    {
        ULDataAdapter adapter = new ULDataAdapter();
        adapter.SelectCommand = new ULCommand(queryString, connection);
        ULCommandBuilder builder = new ULCommandBuilder(adapter);

        connection.Open();

        DataSet dataSet = new DataSet();
        adapter.Fill(dataSet, tableName);

           //code to modify data in DataSet here

        //Without the ULCommandBuilder this line would fail
        adapter.Update(dataSet, tableName);

        return dataSet;
    }
}
See also

ULCommandBuilder members
ULCommandBuilder constructors
DataAdapter property
GetDeleteCommand methods
GetInsertCommand methods
GetUpdateCommand methods