public static bool UpdateProduct(Product oldProduct, Product newProduct) { SqlConnection connection = MMABooksDB.GetConnection(); string updateStatement = "UPDATE Products SET " + "Description = @NewDescription, " + "UnitPrice = @NewPrice " + "WHERE ProductCode = @OldCode "; SqlCommand updateCommand = new SqlCommand(updateStatement, connection); updateCommand.Parameters.AddWithValue( "@NewDescription", newProduct.Description); updateCommand.Parameters.AddWithValue( "@NewPrice", newProduct.Price); updateCommand.Parameters.AddWithValue( "@OldCode", oldProduct.Code); try { connection.Open(); int count = updateCommand.ExecuteNonQuery(); if (count > 0) { return(true); } else { return(false); } } catch (SqlException ex) { throw ex; } finally { connection.Close(); } }
public static bool AddProduct(Product product) { SqlConnection connection = MMABooksDB.GetConnection(); SqlCommand insertCommand = new SqlCommand( "INSERT Products " + "(ProductCode, Description, UnitPrice) " + "VALUES (@ProductCode, @Description, @UnitPrice)", connection); insertCommand.Parameters.AddWithValue( "@ProductCode", product.Code); insertCommand.Parameters.AddWithValue( "@Description", product.Description); insertCommand.Parameters.AddWithValue( "@UnitPrice", product.Price); try { connection.Open(); int count = insertCommand.ExecuteNonQuery(); if (count > 0) { return(true); } else { return(false); } } catch (SqlException exception) { throw exception; } finally { connection.Close(); } }
/// <summary> /// Connects to the database and gets the the information from each /// column for a single row of the products table. /// </summary> /// <param name="code"> the ProductCode</param> /// <returns> returns the product or null </returns> public static Product GetProduct(string code) { SqlConnection connection = MMABooksDB.GetConnection(); string selectStatement = "SELECT ProductCode, Description, UnitPrice " + "FROM Products " + "WHERE ProductCode = @ProductCode"; SqlCommand selectCommand = new SqlCommand(selectStatement, connection); selectCommand.Parameters.AddWithValue("@ProductCode", code); // Trys to open a connection to the database and reads the data. // if its able to read set code, description, and price equal to // what is read in, else return null. try { connection.Open(); SqlDataReader productReader = selectCommand.ExecuteReader(CommandBehavior.SingleRow); if (productReader.Read()) { Product product = new Product(); product.Code = productReader["ProductCode"].ToString(); product.Description = productReader["Description"].ToString(); product.Price = (decimal)productReader["UnitPrice"]; return(product); } else { return(null); } } catch (SqlException ex) { throw ex; } finally { connection.Close(); } }
/// <summary> /// This method deletes a product code and its description and price. /// </summary> /// <param name="product"> and object of Product </param> /// <returns> true if was successful, false if not </returns> public static bool DeleteProduct(Product product) { SqlConnection connection = MMABooksDB.GetConnection(); string deleteStatement = "DELETE FROM Products " + "WHERE ProductCode = @Code " + "AND Description = @Description " + "AND UnitPrice = @UnitPrice"; SqlCommand deleteCommand = new SqlCommand(deleteStatement, connection); deleteCommand.Parameters.AddWithValue("@Code", product.Code); deleteCommand.Parameters.AddWithValue("@Description", product.Description); deleteCommand.Parameters.AddWithValue("@UnitPrice", product.Price); // executenonquery returns number of rows affected. If more than 0, // this means rows were successfully deleted, 0 mean nothing was. try { connection.Open(); int count = deleteCommand.ExecuteNonQuery(); if (count > 0) { return(true); } else { return(false); } } catch (SqlException ex) { throw ex; } finally { connection.Close(); } }
public static Product GetProduct(string code) // code here references PRODUCT CODE { SqlConnection connection = MMABooksDB.GetConnection(); // call without instance because static string selectStatement = "SELECT ProductCode, Description, UnitPrice " + "FROM Products " + "WHERE ProductCode = @Code"; SqlCommand selectCommand = new SqlCommand(selectStatement, connection); selectCommand.Parameters.AddWithValue("@Code", code); try { connection.Open(); SqlDataReader productReader = selectCommand.ExecuteReader(CommandBehavior.SingleRow); // only produce a single row of information if (productReader.Read()) { Product product = new Product(); product.Code = productReader["ProductCode"].ToString(); product.Description = productReader["Description"].ToString(); product.Price = (decimal)productReader["UnitPrice"]; return(product); } else { return(null); } } catch (SqlException ex) { throw ex; } finally { connection.Close(); } }
public static bool DeleteProduct(Product product) { SqlConnection connection = MMABooksDB.GetConnection(); using (connection) { var deleteString = "DELETE FROM Products WHERE ProductCode = '@productCode'"; var command = new SqlCommand(deleteString, connection); command.Parameters.AddWithValue("@code", product.Code); // execute query try { connection.Open(); var rows = command.ExecuteNonQuery(); if (rows < 1) { return(false); } else { return(true); } } catch (SqlException e) { Console.WriteLine("SQL Error" + e.ToString()); Console.ReadKey(); } return(false); } }
public static Product GetProduct(string productCode) { SqlConnection connection = MMABooksDB.GetConnection(); string selectStatement = "SELECT ProductCode, Description, UnitPrice, OnHandQuantity " + "FROM Products " + "WHERE ProductCode = @ProductCode"; SqlCommand selectCommand = new SqlCommand(selectStatement, connection); selectCommand.Parameters.AddWithValue("@ProductCode", productCode); try { connection.Open(); SqlDataReader productReader = selectCommand.ExecuteReader(CommandBehavior.SingleRow); if (productReader.Read()) { Product product = new Product(); product.Code = productReader["ProductCode"].ToString(); product.Description = productReader["Description"].ToString(); product.Price = (decimal)productReader["UnitPrice"]; return(product); } else { return(null); } } catch (SqlException ex) { throw ex; } finally { connection.Close(); } }
public static Product GetProduct(string productCode) { SqlConnection connection = MMABooksDB.GetConnection(); string selectStatement = "SELECT ProductCode, Description, Price " + "FROM Products " + "WHERE ProductCode = @ProductCode"; SqlCommand selectCommand = new SqlCommand(selectStatement, connection); selectCommand.Parameters.AddWithValue("@ProductCode", productCode); try { connection.Open(); SqlDataReader reader = selectCommand.ExecuteReader(); if (reader.Read()) { Product p = new Product(); p.Code = reader["ProductCode"].ToString(); p.Description = reader["Description"].ToString(); p.Price = Convert.ToDecimal(reader["UnitPrice"]); return(p); } else { return(null); } } catch (SqlException s) { throw s; } finally { connection.Close(); } }
public static bool DeleteProduct(Product product) { SqlConnection connection = MMABooksDB.GetConnection(); string deleteStatement = "DELETE FROM Products " + "WHERE ProductCode = @ProductCode " + "AND Description = @Description " + "AND UnitPrice = @UnitPrice"; SqlCommand deleteCommand = new SqlCommand(deleteStatement, connection); deleteCommand.Parameters.AddWithValue("@ProductCode", product.Code); deleteCommand.Parameters.AddWithValue("@Description", product.Description); deleteCommand.Parameters.AddWithValue("@UnitPrice", product.Price); try { connection.Open(); int count = deleteCommand.ExecuteNonQuery(); if (count > 0) { return(true); } else { return(false); } } catch (SqlException ex) { throw ex; } finally { connection.Close(); } }