Querying Data

The ADO.NET Provider for Salesforce implements two classes you can use to perform CRUD (Create, Read, Update, and Delete) operations: DbDataReader and C1SalesforceDataAdapter classes. The tabs below describe the classes and code implementations.

Data Reader

Querying With DbDataReader

The DbDataReader class can be used to fetch data in subset increments as required. It can retrieve data quicker than the C1SalesforceDataAdapter as it retrieves data in pages. When you read data from the DbDataReader, it requests the succeeding page from the data source to load the result, which makes the data retrieval faster.

The following code examples demonstrate create, read, update, and delete operations from the data source using the DbDataReader.

Create Data

The example adds new records by executing the Insert command.

static void InsertDataReader()
{
    Console.WriteLine("Insert operation started !!!");
    using (C1SalesforceConnection conn = new C1SalesforceConnection(GCSalesforceServerConnectionString))
    {
        conn.Open();
        string insertSql = @"Insert into [Order] (AccountId, Status, BillingState,BillingStreet,BillingCity,BillingPostalCode,BillingCountry,EffectiveDate) 
                        Values ('0012w00000Ak4iLAAR', 'Draft','Delhi','Delhi','NCR','110009','India','23-JAN-1992')";
        //Create Insert command;
        C1SalesforceCommand command = new C1SalesforceCommand(conn, insertSql);
        // Execute Insert command
        int i = command.ExecuteNonQuery();
        if (i != -1)
        {
            Console.WriteLine("Insert operation successful !!! \n \n");
        }
    }
}

Read Data

This example retrieves data by executing the Select command.

static void ReadDataReader()
{
    Console.WriteLine("Read operation started !!!");
    using (C1SalesforceConnection con = new C1SalesforceConnection(GCSalesforceServerConnectionString))
    {
        con.Open();
        //Create Read command
        var cmd = con.CreateCommand();
        cmd.CommandText = "Select  *  FROM [Order] limit 10 ";
        //Execute Read command and display fetched data
        var rdr = cmd.ExecuteReader();
        while (rdr.Read())
        {
            Console.WriteLine(String.Format("\t{0} --> \t\t{1} --> \t\t{2}", rdr["Id"], rdr["AccountId"], rdr["BillingCity"]));
        }
        Console.WriteLine("Read operation successful !!! \n \n");
    }
}

Update Data

This example modifies data by executing the Update command.

static void UpdateDataReader()
{
    Console.WriteLine("Update operation started !!!");
    using (C1SalesforceConnection conn = new C1SalesforceConnection(GCSalesforceServerConnectionString))
    {
        conn.Open();
        //Create Update command
        C1SalesforceCommand command = new C1SalesforceCommand(conn, "UPDATE [Order] SET BillingCity=@BillingCity where AccountId=@AccountId");
        command.Parameters.AddWithValue("@AccountId", "0012w00000Ak4iLAAR");
        command.Parameters.AddWithValue("@BillingCity", "Delhi");
        //Execute Update command
        int i = command.ExecuteNonQuery();
        if (i != -1)
        {
            Console.WriteLine("Update operation successful !!! \n \n");
        }
    }
}

Delete Data

This example removes data by executing the Delete command.

static void DeleteDataReader()
{
    Console.WriteLine("Delete operation started!!!");
    using (C1SalesforceConnection conn = new C1SalesforceConnection(GCSalesforceServerConnectionString))
    {
        conn.Open();
        //Create Delete command
        C1SalesforceCommand command = new C1SalesforceCommand(conn, "Delete from [Order] where AccountId = @AccountId ");
        command.Parameters.AddWithValue("@AccountId", "0012w00000Ak4iLAAR");
        //Execute Delete command
        int i = command.ExecuteNonQuery();
        if (i != -1)
        {
            Console.WriteLine("Delete operation successful !!! \n \n");
        }
    }
}

Data Adapter

Querying With C1SalesforceDataAdapter

The C1SalesforceDataAdapter class can be used to retrieve a single result set containing all the data that matches a given query. The C1SalesforceDataAdapter uses its Fill method to fetch data from the data source. An empty DataTable instance is passed as an argument to the Fill method. Once the method returns, the DataTable instance is populated with the queried data. Since the Fill method must retrieve all the data from the data source before returning, the C1SalesforceDataAdapter is slower compared to the DbDataReader.

The following code examples demonstrate create, read, update, and delete operations from the data source using the C1SalesforceDataAdapter.