• Introduction
• Requirements
• General Information
• Retrieving Data using SalesforceCommand and SalesforceDataReader
• Retrieving Data using SalesforceDataAdapter
• Additional Information

Introduction

This tutorial describes how to use SalesforceCommand, SalesforceDataReader, and SalesforceDataAdapter components.

Requirements

This tutorial supposes that you know how to connect to server.

Note that if you do not use design-time (specifically, if you do not place on a designer SalesforceConnection component from toolbox), you have to embed license information manually. This is described in the Licensing topic.

General Information

The main function of any database application is establishing a connection to a data source and working with data contained in it. ADO.NET data providers serve as a bridge between an application and a data source, and allow you to execute commands as well as to retrieve data by using a DataReader or a DataAdapter. Updating data involves using the Command and DataAdapter objects.

Retrieving Data using SalesforceCommand and SalesforceDataReader

In this sample we will use SalesforceCommand and SalesforceDataReader to retrieve data. SalesforceDataReader allows retrieving data in pages. While you read data from it, it automatically queries next pages from Salesforce.com or Database.com. SalesforceDataReader offers higher performance than SalesforceDataAdapter, especially when you query a lot of data. For more information, refer to the description of these classes in our documentation.

using Devart.Data.Salesforce;
...
class Program
{
    static void Main(string[] args) {

        const string connectionString = "Server=login.salesforce.com;User Id= [email protected];Password=mypassword;Security Token=qweASDzcx1234567890rtyui;";
        const string sql = "SELECT FirstName, LastName FROM Contact";

        using (SalesforceConnection connection = new SalesforceConnection(connectionString)) {

            connection.Open();
            using (SalesforceCommand command = connection.CreateCommand()) {

                command.CommandText = sql;
                using (SalesforceDataReader reader = command.ExecuteReader()) {

                    while (reader.Read()) {

                        Console.WriteLine("{0}\t{1}", reader.GetValue(0), reader.GetValue(1));
                    }
                }
            }
        }
        Console.ReadKey();
    }

}

Imports Devart.Data.Salesforce
...
Module Module1

    Sub Main()

        Const connectionString As String = "Server=login.salesforce.com;User Id= [email protected];Password=mypassword;Security Token=qweASDzcx1234567890rtyui;"
        Const sql As String = "SELECT FirstName, LastName FROM Contact"

        Using connection As New SalesforceConnection(connectionString)

            connection.Open()
            Using command As SalesforceCommand = connection.CreateCommand()

                command.CommandText = sql
                Using reader As SalesforceDataReader = command.ExecuteReader()

                    While reader.Read()

                        Console.WriteLine(reader.GetValue(0) & vbTab & reader.GetValue(1))
                    End While
                End Using
            End Using
        End Using
        Console.ReadKey()
    End Sub

End Module

Retrieving Data using SalesforceDataAdapter

In this sample we will use the SalesforceDataAdapter component. It retrieves data when you call its Fill method. Note that this method needs to retrieve all the queried data from Salesforce.com or Database.com, and it can take some time.

Here is a small sample that demonstrates usage of SalesforceDataAdapter to retrieve data.

    static void Main(string[] args) {

        const string connectionString = "Server=login.salesforce.com;User Id= [email protected];Password=mypassword;Security Token=qweASDzcx1234567890rtyui;";
        const string sql = "SELECT FirstName, LastName FROM Contact";

        using (SalesforceConnection connection = new SalesforceConnection(connectionString)) {

            connection.Open();
            var table = new System.Data.DataTable("Contact");

            using (SalesforceCommand command = connection.CreateCommand()) {

                command.CommandText = sql;
                using (SalesforceDataAdapter adapter = new SalesforceDataAdapter(command)) {
                    adapter.Fill(table);
                }
            }

            foreach (DataRow row in table.Rows) {
                Console.WriteLine("{0}\t{1}", row[0], row[1]);
            }
        }
        Console.ReadKey();
    }

    Sub Main()

        Const connectionString As String = "Server=login.salesforce.com;User Id= [email protected];Password=mypassword;Security Token=qweASDzcx1234567890rtyui;"
        Const sql As String = "SELECT FirstName, LastName FROM Contact"

        Using connection As New SalesforceConnection(connectionString)

            connection.Open()
            Dim table As New System.Data.DataTable("Campaigns")

            Using command As SalesforceCommand = connection.CreateCommand()

                command.CommandText = sql
                Using adapter As New SalesforceDataAdapter(command)
                    adapter.Fill(table)
                End Using
            End Using

            For Each row As DataRow In table.Rows
                Console.WriteLine(row(0) & vbTab & row(1))
            Next
        End Using
        Console.ReadKey()
    End Sub

Additional Information

This tutorial describes only basic ways of working with data. For example, you can take advantage of using Entity Framework ORM technology which is intended for converting data between incompatible type systems in different data sources and object-oriented programming languages. This technology allow you to decrease the amount of code and maintenance required for data-oriented applications. For more information, please refer to Entity Framework section.

See Also

Entity Framework  | Updating Data