First Commit - Source Code from Reply

dbcmnpsrc/FE/mnpdev/sim/InfobusR4/src/tim/dao/BaseDao.java

@@ -0,0 +1,110 @@
+package tim.dao;
+
+import java.sql.*;
+import javax.naming.*;
+import javax.sql.*;
+
+
+/**
+ * <p>Title: </p>
+ * <p>Description: </p>
+ * <p>Copyright: Copyright (c) 2007</p>
+ * <p>Company: </p>
+ * @author not attributable
+ * @version 1.0
+ */
+
+public abstract class BaseDao {
+
+
+  protected DataSource ds;
+  protected InitialContext ctx;
+  protected String DATASOURCE = "jdbc/mnpDS";
+
+ /**
+  * Inizializza il data source
+  * @throws Exception
+  */
+ protected void initDB() throws Exception{
+     try
+     {
+         ctx = new InitialContext();
+         ds = (DataSource)ctx.lookup(DATASOURCE);
+     }
+     catch (Exception ex)
+     {
+         ex.printStackTrace();
+         throw ex;
+     }
+     finally
+     {
+         try
+         {
+           ctx.close();
+         }
+         catch (Exception ex) {}
+     }
+ }
+
+  /**
+  * Metodo per ottenere le connessioni dal DB
+  * Se non è disponibile una connessione ritorna null
+  */
+   public Connection getConnection() throws Exception{
+     Connection conn = null;
+     try
+     {
+         if (ds==null) initDB();
+         conn = ds.getConnection();
+
+     }
+     catch (Exception ex)
+     {
+         ex.printStackTrace();
+         throw ex;
+     }
+     finally
+     {
+         try
+         {
+            if( conn != null ) conn.setAutoCommit(false);
+         }
+         catch (Exception ex)
+         {
+           ex.printStackTrace();
+           throw ex;
+         }
+     }
+     // se non riesce ad ottenere una connessione per tre volte torna null
+     return conn;
+
+ }
+
+
+   /**
+    * Metodo per la chiusura del ResultSet,dello Statement e della Connection
+    * tale metodo non lancia eccezzioni
+    * @param rs
+    * @param stmt
+    * @param c
+    */
+   public void closeAll(ResultSet rs, Statement stmt, Connection c) {
+       try
+       {
+           if(rs!=null) rs.close();
+       }
+       catch (Throwable ex) {}
+       try
+       {
+           if(stmt!=null) stmt.close();
+       }
+       catch (Throwable ex) {}
+       try
+       {
+           if(c!=null)
+             c.close();
+       }
+       catch (Throwable ex) {}
+   }
+
+}