internal void Create(Product product)
{
var query = "INSERT INTO Products VALUES(@Id, @Name, @Description)";
var connection = new SqlConnection(SQL_CONNECTION);
connection.Open();
using (var trans = connection.BeginTransaction())
{
try
{
var command = new SqlCommand(query, connection, trans);
command.Parameters.AddWithValue("@Id", product.Id);
command.Parameters.AddWithValue("@Name", product.Name);
command.Parameters.AddWithValue("@Description", product.Description);
var rowCount = command.ExecuteNonQuery();
if (rowCount == 0)
{
throw new Exception(string.Format("Error: Product '{0}' was not created.", product.Name));
}
trans.Commit();
//products.Add(product);
}
catch (Exception ex)
{
trans.Rollback();
throw new Exception("Something went wrong. " + ex.Message);
}
finally
{
connection.Close();
}
}
}
public List<Product> GetProducts()
{
var query = "SELECT * FROM Products";
var connection = new SqlConnection(SQL_CONNECTION);
var command = new SqlCommand(query, connection);
connection.Open();
try
{
var reader = command.ExecuteReader();
if (reader.HasRows)
{
products = new List<Product>();
while (reader.Read())
{
var product = new Product() { Id = reader.GetGuid(0), Name = reader.GetString(1), Description = reader.GetString(2) };
products.Add(product);
}
}
}
finally
{
connection.Close();
}
return products;
}
internal void SaveChanges(Product product)
{
var query = "UPDATE Products SET Name = @Name, Description = @Description WHERE Id = @Id";
var connection = new SqlConnection(SQL_CONNECTION);
connection.Open();
using (var trans = connection.BeginTransaction())
{
try
{
var command = new SqlCommand(query, connection, trans);
command.Parameters.AddWithValue("@Name", product.Name);
command.Parameters.AddWithValue("@Description", product.Description);
command.Parameters.AddWithValue("@Id", product.Id);
var rowCount = command.ExecuteNonQuery();
if (rowCount == 0)
{
throw new Exception(string.Format("Error: Product '{0}' was not modified.", product.Name));
}
trans.Commit();
//var index = products.FindIndex(x => x.Id == product.Id);
//products[index] = product;
}
catch (Exception ex)
{
trans.Rollback();
throw new Exception("Something went wrong. " + ex.Message);
}
finally
{
connection.Close();
}
}
}
internal void Remove(Product product)
{
var query = "DELETE FROM Products WHERE Id = @Id";
var connection = new SqlConnection(SQL_CONNECTION);
connection.Open();
using (var trans = connection.BeginTransaction())
{
try
{
var command = new SqlCommand(query, connection, trans);
command.Parameters.AddWithValue("@Id", product.Id);
var rowCount = command.ExecuteNonQuery();
if (rowCount == 0)
{
throw new Exception(string.Format("Error: Product '{0}' was not deleted.", product.Name));
}
trans.Commit();
//products.Remove(product);
}
catch (Exception ex)
{
trans.Rollback();
throw new Exception("Something went wrong. " + ex.Message);
}
finally
{
connection.Close();
}
}
}
