Java tutorial
package org.teama; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.logging.Level; import org.apache.commons.collections.CollectionUtils; import org.apache.commons.collections.Predicate; /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ /** * * @author bamidei */ public class PriorityListDA { static private ArrayList<Priority> priorityList = null; static public ArrayList<Priority> getAppList() { if (priorityList == null) load(); return priorityList; } static public Priority getPriority(final int id) { if (priorityList == null) load(); if (priorityList != null) { /* Use collectionUtils to find the matching App from the list */ return (Priority) CollectionUtils.find(priorityList, new Predicate() { @Override public boolean evaluate(Object o) { Priority p = (Priority) o; return p.getPriorityId() == id; } }); } else { return null; } } static public boolean load() { boolean res; /* Get a new list to populate - even if we had already populated, this will throw away the old and replace with a new 'load'. */ priorityList = new ArrayList<Priority>(); /*Simple get all of the defects query. We'll sort and filter as necessary using java collection operations. */ String query = "SELECT * FROM BugTracker.priority"; try { Connection connection = DBconnect.getConnection(); Statement statement = connection.createStatement(); ResultSet rs = statement.executeQuery(query); if (rs != null) { while (rs.next()) { Priority p; p = new Priority(rs.getInt("priority_id"), rs.getString("severity")); priorityList.add(p); } } connection.close(); statement.close(); res = true; } catch (SQLException ex) { DBconnect.getLogger().log(Level.SEVERE, "Error Reading priority list from database", ex); res = false; } return res; } }