コード例 #1
0
  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!");
    }
  }
コード例 #2
0
  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");
    }
  }