public void connectItems(String query)
// PRE: query must be initialized
// POST: Updates the list of Items based on the query.
{
String driver = "org.apache.derby.jdbc.ClientDriver"; // Driver for DB
String url = "jdbc:derby://localhost:1527/ShopDataBase"; // Url for DB
String user = "******"; // Username for db
String pass = "******"; // Password for db
Connection myConnection; // Connection obj to db
Statement stmt; // Statement to execute a result appon
ResultSet results; // A set containing the returned results
int rowcount; // Num objects in the resultSet
int i; // Index for the array
try { // Try connection to db
Class.forName(driver).newInstance(); // Create our db driver
myConnection = DriverManager.getConnection(url, user, pass); // Initalize our connection
stmt =
myConnection.createStatement(
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE); // Create a new statement
results = stmt.executeQuery(query); // Store the results of our query
rowcount = 0;
if (results.last()) // Go to the last result
{
rowcount = results.getRow();
results.beforeFirst();
}
itemsArray = new Item[rowcount];
i = 0;
while (results.next()) // Itterate through the results set
{
itemsArray[i] =
new Item(
results.getInt("item_id"),
results.getString("item_name"),
results.getString("item_type"),
results.getInt("price"),
results.getInt("owner_id"),
results.getString("item_path")); // Creat new Item
i++;
}
results.close(); // Close the ResultSet
stmt.close(); // Close the statement
myConnection.close(); // Close the connection to db
} catch (Exception e) // Cannot connect to db
{
System.err.println(e.toString());
System.err.println("Error, something went horribly wrong in connectItems!");
}
}
public void updateTables(String updateQuery1, String updateQuery2, String updateQuery3)
// PRE: updateQuery1,updateQuery2, updateQuery3 must be initialized
// POST: Updates the list of Items based on the querys.
{
String driver = "org.apache.derby.jdbc.ClientDriver"; // Driver for DB
String url = "jdbc:derby://localhost:1527/ShopDataBase"; // Url for DB
String user = "******"; // Username for db
String pass = "******"; // Password for db
Connection myConnection; // Connection obj to db
Statement stmt; // Statement to execute a result appon
ResultSet results; // A set containing the returned results
int i; // Index for the array
try // Try connection to db
{
Class.forName(driver).newInstance(); // Create our db driver
myConnection = DriverManager.getConnection(url, user, pass); // Initalize our connection
stmt =
myConnection.createStatement(
ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
stmt.executeUpdate(updateQuery1);
stmt.executeUpdate(updateQuery2);
stmt.executeUpdate(updateQuery3);
results = stmt.executeQuery(previous_query); // Call the previous query
i = 0;
while (results.next()) // Itterate through the results set
{
itemsArray[i] =
new Item(
results.getInt("item_id"),
results.getString("item_name"),
results.getString("item_type"),
results.getInt("price"),
results.getInt("owner_id"),
results.getString("item_path"));
i++;
}
results.close(); // Close the ResultSet
stmt.close(); // Close the statement
myConnection.close(); // Close the connection to db
} catch (Exception e) // Cannot connect to db
{
System.err.println(e.toString());
System.err.println("Error, something went horribly wrong! in updateTables");
}
}