Dynamic JDBC driver loading

default.cfg

@@ -5,6 +5,7 @@
 <properties>
 
     <!-- Global confiduration -->
+    <!--<entry key='database.driverFile'>/home/user/Documents/traccar/hsqldb.jar</entry>-->
     <entry key='database.driver'>org.h2.Driver</entry>
     <entry key='database.dataSource'>org.h2.jdbcx.JdbcDataSource</entry>
     <entry key='database.url'>jdbc:h2:/home/user/Documents/traccar/target/database</entry>

src/org/traccar/ServerManager.java

@@ -89,8 +89,7 @@ public Properties getProperties() {
         return  properties;
     }
 
-    public void init(String[] arguments)
-            throws IOException, ClassNotFoundException, SQLException {
+    public void init(String[] arguments) throws Exception {
 
         // Load properties
         properties = new Properties();

src/org/traccar/helper/DriverDelegate.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2013 Anton Tananaev ([email protected])
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.helper;
+
+import java.sql.Connection;
+import java.sql.Driver;
+import java.sql.DriverPropertyInfo;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.util.Properties;
+import java.util.logging.Logger;
+
+/**
+ * Database driver delegate
+ */
+public class DriverDelegate implements Driver {
+
+    private Driver driver;
+
+    public DriverDelegate(Driver driver) {
+        this.driver = driver;
+    }
+
+    @Override
+    public Connection connect(String url, Properties info) throws SQLException {
+        return driver.connect(url, info);
+    }
+
+    @Override
+    public boolean acceptsURL(String url) throws SQLException {
+        return driver.acceptsURL(url);
+    }
+
+    @Override
+    public DriverPropertyInfo[] getPropertyInfo(String url, Properties info) throws SQLException {
+        return driver.getPropertyInfo(url, info);
+    }
+
+    @Override
+    public int getMajorVersion() {
+        return driver.getMajorVersion();
+    }
+
+    @Override
+    public int getMinorVersion() {
+        return driver.getMinorVersion();
+    }
+
+    @Override
+    public boolean jdbcCompliant() {
+        return driver.jdbcCompliant();
+    }
+
+    @Override
+    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
+        return driver.getParentLogger();
+    }
+
+}

src/org/traccar/model/DatabaseDataManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 Anton Tananaev ([email protected])
+ * Copyright 2012 - 2013 Anton Tananaev ([email protected])
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,18 +15,21 @@
  */
 package org.traccar.model;
 
+import java.io.File;
+import java.net.URL;
+import java.net.URLClassLoader;
 import java.sql.*;
 import java.util.*;
 import org.traccar.helper.AdvancedConnection;
+import org.traccar.helper.DriverDelegate;
 import org.traccar.helper.NamedParameterStatement;
 
 /**
  * Database abstraction class
  */
 public class DatabaseDataManager implements DataManager {
 
-    public DatabaseDataManager(Properties properties)
-            throws ClassNotFoundException, SQLException {
+    public DatabaseDataManager(Properties properties) throws Exception {
         initDatabase(properties);
     }
 
@@ -40,13 +43,21 @@ public DatabaseDataManager(Properties properties)
     /**
      * Initialize database
      */
-    private void initDatabase(Properties properties)
-            throws ClassNotFoundException, SQLException {
+    private void initDatabase(Properties properties) throws Exception {
 
         // Load driver
         String driver = properties.getProperty("database.driver");
         if (driver != null) {
-            Class.forName(driver);
+            String driverFile = properties.getProperty("database.driverFile");
+
+            if (driverFile != null) {
+                URL url = new URL("jar:file:" + new File(driverFile).getAbsolutePath() + "!/");
+                URLClassLoader cl = new URLClassLoader(new URL[] { url });
+                Driver d = (Driver) Class.forName(driver, true, cl).newInstance();
+                DriverManager.registerDriver(new DriverDelegate(d));
+            } else {
+                Class.forName(driver);
+            }
         }
 
         // Refresh delay