/// <summary>
/// select customer as an asynchronous operation.
/// </summary>
/// <param name="customerId">The customer identifier.</param>
/// <returns>Task<System.String>.</returns>
public async Task <string> SelectCustomerAsync(int customerId)
{
String sql = "select * from customer where customer_id = @customer_id";
AceQLCommand command = new AceQLCommand(sql, connection);
command.Parameters.AddWithValue("@customer_id", 1);
String resultString = null;
using (AceQLDataReader dataReader = await command.ExecuteReaderAsync())
{
while (dataReader.Read())
{
int i = 0;
resultString = dataReader.GetString(i++);
resultString += " / " + dataReader.GetString(i++);
resultString += " / " + dataReader.GetString(i++);
resultString += " / " + dataReader.GetString(i++);
resultString += " / " + dataReader.GetString(i++);
resultString += " / " + dataReader.GetString(i++);
resultString += " / " + dataReader.GetString(i++);
resultString += " / " + dataReader.GetString(i++);
}
}
return(resultString);
}
/// <summary>
/// Example of 2 SELECT.
/// </summary>
/// <param name="customerId">The cutomer ID.</param>
private async Task SelectCustomerAndOrderLogAsync(int customerId)
{
// Display the created Customer:
string sql = "select customer_id, fname, lname from customer "
+ " where customer_id = @customer_id";
AceQLCommand command = new AceQLCommand(sql, connection);
command.Parameters.AddWithValue("@customer_id", customerId);
using (AceQLDataReader dataReader = await command.ExecuteReaderAsync())
{
while (dataReader.Read())
{
int i = 0;
int customerId2 = dataReader.GetInt32(i++);
string fname = dataReader.GetString(i++);
string lname = dataReader.GetString(i++);
AceQLConsole.WriteLine();
AceQLConsole.WriteLine("customer_id : " + customerId2);
AceQLConsole.WriteLine("fname : " + fname);
AceQLConsole.WriteLine("lname : " + lname);
}
}
sql = "select * from orderlog where customer_id = @customer_id and item_id = @item_id ";
command = new AceQLCommand(sql, connection);
command.Parameters.AddWithValue("@customer_id", customerId);
command.Parameters.AddWithValue("@item_id", customerId);
using (AceQLDataReader dataReader = await command.ExecuteReaderAsync())
{
while (dataReader.Read())
{
int i = 0;
int customerId2 = dataReader.GetInt32(i++);
int itemId2 = dataReader.GetInt32(i++);
string description = dataReader.GetString(i++);
Decimal costPrice = dataReader.GetDecimal(i++);
DateTime datePlaced = dataReader.GetDateTime(i++).Date;
DateTime dateShipped = dataReader.GetDateTime(i++);
Stream stream = await dataReader.GetStreamAsync(i ++); // null stream
bool is_delivered = dataReader.GetInt32(i++) == 1 ? true : false;
int quantity = dataReader.GetInt32(i++);
AceQLConsole.WriteLine("customer_id : " + customerId2);
AceQLConsole.WriteLine("item_id : " + itemId2);
AceQLConsole.WriteLine("description : " + description);
AceQLConsole.WriteLine("cost_price : " + costPrice);
AceQLConsole.WriteLine("date_placed : " + datePlaced.Date);
AceQLConsole.WriteLine("date_shipped: " + dateShipped);
AceQLConsole.WriteLine("is_delivered: " + is_delivered);
AceQLConsole.WriteLine("quantity : " + quantity);
}
}
}