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Manage
The manage step provides data management functionality for your application and/or process.
Below is the code for Manage():
//
// Manage()
//
// Populates table and perform a simple query
//
static void Manage()
{
Console.WriteLine("MANAGE");
// populate the tables with data
Add_CustomerMaster_Records();
Add_ItemMaster_Records();
Add_Transactions();
// display the orders and their items
Display_CustomerOrders();
Display_OrderItems();
}
// Add_CustomerMaster_Records()
//
// This function adds records to table CustomerMaster from an
// array of strings
//
static void Add_CustomerMaster_Records()
{
String[] data = {
"('1000','92867','CA','1','Bryan Williams','2999 Regency','Orange')",
"('1001','61434','CT','1','Michael Jordan','13 Main','Harford')",
"('1002','73677','GA','1','Joshua Brown','4356 Cambridge','Atlanta')",
"('1003','10034','MO','1','Keyon Dooling','19771 Park Avenue','Columbia')"
};
Console.WriteLine("\tAdd records in table CustomerMaster...");
try
{
// add one record at time to table
for (int i = 0; i < data.Length; i++)
{
cmd.CommandText = "INSERT INTO custmast VALUES " + data[i];
cmd.ExecuteNonQuery();
}
}
catch (CtreeSqlException e)
{
Handle_Exception(e);
}
catch (Exception e)
{
Handle_Exception(e);
}
}
//
// Add_ItemMaster_Records()
//
// This function adds records to table ItemMaster from an
// array of strings
//
static void Add_ItemMaster_Records()
{
String[] data = {
"(10,19.95,'1','Hammer')",
"(3, 9.99,'2','Wrench')",
"(4, 16.59,'3','Saw')",
"(1, 3.98,'4','Pliers')"
};
Console.WriteLine("\tAdd records in table ItemMaster...");
try
{
// add one record at time to table
for (int i = 0; i < data.Length; i++)
{
cmd.CommandText = "INSERT INTO itemmast VALUES " + data[i];
cmd.ExecuteNonQuery();
}
}
catch (CtreeSqlException e)
{
Handle_Exception(e);
}
catch (Exception e)
{
Handle_Exception(e);
}
}
//
// Add_Transactions()
//
// Add an Order and associated Items "as a transaction" to their
// respective tables. A transaction is committed or aborted if the
// customer number on the order is confirmed valid. Likewise each
// item in the order is verified to be a valid item.
//
static void Add_Transactions()
{
String[,] orders = {
{ "09/01/2002", "09/05/2002", "1", "1001" },
{ "09/02/2002", "09/06/2002", "2", "9999" }, // bad customer number
{ "09/22/2002", "09/26/2002", "3", "1003" }
};
String[,] items = {
{ "1", "1", "2", "1" },
{ "1", "2", "1", "2" },
{ "2", "1", "1", "3" },
{ "2", "2", "3", "4" },
{ "3", "1", "2", "3" },
{ "3", "2", "2", "99"} // bad item number
};
Console.WriteLine("\tAdd transaction records...");
for (int i = 0, j = 0; i < orders.GetLength(0); i++)
{
try
{
cmd.Transaction = conn.BeginTransaction();
cmd.CommandText = "INSERT INTO custordr VALUES (" +
"'" + orders[i, 0] + "', " +
"'" + orders[i, 1] + "', " +
"'" + orders[i, 2] + "', " +
"'" + orders[i, 3] + "')";
cmd.ExecuteNonQuery();
}
catch (CtreeSqlException e)
{
Handle_Exception(e);
}
catch (Exception e)
{
Handle_Exception(e);
}
// process order items
while (items[j, 0].CompareTo(orders[i, 2]) == 0)
{
try
{
// add item record
cmd.CommandText = "INSERT INTO ordritem VALUES (" +
items[j, 1] + ", " +
items[j, 2] + ", " +
"'" + items[j, 0] + "', " +
"'" + items[j, 3] + "')";
cmd.ExecuteNonQuery();
}
catch (CtreeSqlException e)
{
Handle_Exception(e);
}
catch (Exception e)
{
Handle_Exception(e);
}
// bump to next item
j++;
// exit the while loop on last item
if (j >= items.GetLength(0))
break;
}
try
{
cmd.Transaction.Commit();
}
catch (CtreeSqlException e)
{
Handle_Exception(e);
cmd.Transaction.Rollback();
}
catch (Exception e)
{
Handle_Exception(e);
}
}
}
//
// Display_CustomerOrders()
//
// This function displays the contents of CustomerOrders table.
//
static void Display_CustomerOrders()
{
Console.WriteLine("\n\tCustomerOrders Table...");
try
{
// execute a query statement
cmd.CommandText = "SELECT * FROM custordr";
rdr = (CtreeSqlDataReader)cmd.ExecuteReader();
// fetch and display each individual record
while (rdr.Read())
{
Console.WriteLine("\t {0} {1}", rdr.GetString(2), rdr.GetString(3));
}
rdr.Close();
}
catch (CtreeSqlException e)
{
Handle_Exception(e);
}
catch (Exception e)
{
Handle_Exception(e);
}
}
//
// Display_OrderItems()
//
// This function displays the contents of OrderItems table.
//
static void Display_OrderItems()
{
Console.WriteLine("\n\tOrderItems Table...");
try
{
// execute a query statement
cmd.CommandText = "SELECT * FROM ordritem";
rdr = (CtreeSqlDataReader)cmd.ExecuteReader();
// fetch and display each individual record
while (rdr.Read())
{
Console.WriteLine("\t {0} {1}", rdr.GetString(2), rdr.GetString(3));
}
rdr.Close();
}
catch (CtreeSqlException e)
{
Handle_Exception(e);
}
catch (Exception e)
{
Handle_Exception(e);
}
}
