waste zone/type/city info on device page

src/java/com/wasteinformationserver/db/JDBC.java

@@ -0,0 +1,73 @@
+package com.wasteinformationserver.db;
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public class JDBC {
+    static Connection conn;
+
+    static JDBC JDBC;
+    static boolean loggedin = false;
+
+    static String usernamec;
+    static String passwordc;
+    static String dbnamec;
+    static String ipc;
+    static int portc;
+
+    public static void init(String username, String password, String dbname, String ip, int port) throws IOException {
+        usernamec = username;
+        passwordc = password;
+        dbnamec = dbname;
+        JDBC = new JDBC(username, password, dbname, ip, port);
+    }
+
+    private JDBC(String username, String password, String dbname, String ip, int port) throws IOException {
+        logintodb(username, password, dbname, ip, port);
+    }
+
+    public static JDBC getInstance() throws IOException {
+        if (loggedin) {
+            return JDBC;
+        } else {
+            logintodb(usernamec, passwordc, dbnamec, ipc, portc);
+            return JDBC;
+        }
+
+    }
+
+    public static void logintodb(String username, String password, String dbname, String ip, int port) throws IOException {
+        Database db = new MySQLConnector(
+                username,
+                password,
+                ip,
+                port,
+                dbname);
+
+        try {
+            conn = db.getConnection();
+            loggedin = true;
+        } catch (SQLException e) {
+            throw new IOException("No connection to database");
+        }
+
+    }
+
+    public ResultSet executeQuery(String sql) {
+        try {
+            PreparedStatement stmt = conn.prepareStatement(sql);
+            return stmt.executeQuery();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public int executeUpdate(String sql) throws SQLException {
+        PreparedStatement stmt = conn.prepareStatement(sql);
+
+        return stmt.executeUpdate();
+    }
+}