SqlService.java :  » Groupware » lucane » org » lucane » applications » sqlnavigator » Java Open Source

/*
 * Lucane - a collaborative platform
 * Copyright (C) 2003  Vincent Fiack <vfiack@mail15.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.lucane.applications.sqlnavigator;

import java.sql.*;
import java.util.*;

import org.lucane.common.*;
import org.lucane.common.net.ObjectConnection;
import org.lucane.server.*;
import org.lucane.server.database.*;


public class SqlService
extends Service
{
  private DatabaseAbstractionLayer layer;
  
  public SqlService()
  {
  }
  
  public void init(Server parent)
  {
    this.layer = parent.getDBLayer();
  }
  
  
  public void process(ObjectConnection oc, Message message)
  {
    SqlAction sa = (SqlAction)message.getData();
    switch(sa.action)
    {
      case SqlAction.GET_DRIVER_INFO:
        getDriverInfo(oc);
      break;
      case SqlAction.GET_TABLE_NAMES:
        getTableNames(oc);
      break;
      case SqlAction.EXECUTE_QUERY:
        executeQuery(oc, sa.params);
      break;
    }
  }
  
  
  
  private void executeQuery(ObjectConnection oc, Object object) 
  {
    try
    {
      SqlResult result = new SqlResult();
      
      Connection c = layer.getConnection();
      Statement stm = c.createStatement();
      ResultSet rs = stm.executeQuery((String)object);
      
      try {
        //-- column names      
        ResultSetMetaData meta = rs.getMetaData();
        int cols = meta.getColumnCount();    
        for(int i=0;i<cols;i++)
          result.addColumn(meta.getColumnLabel(i+1));
        
        //-- data
        while(rs.next())
        {
          Vector line = new Vector();
          
          for(int i=0;i<cols;i++)
            line.add(rs.getString(i+1));
          
          result.addLine(line);
        }
      } catch(SQLException sqle) {
        //probably not a select statement
      }
      
      oc.write(result);
      c.close();
    }  
    catch(Exception e)
    {
      e.printStackTrace();
    }
  }
  
  
  
  private void getTableNames(ObjectConnection oc)
  {
    Vector data = new Vector();
    
    try
    {
        Connection connection = layer.getConnection();
      DatabaseMetaData dbmd = connection.getMetaData();
      String[] types = {"TABLE", "VIEW"};
      ResultSet rs = dbmd.getTables(null,null,null,types);
      
      //field n3 is the table name
      while(rs.next())
        data.addElement(rs.getString(3));
      
      rs.close();
      connection.close();
      oc.write(data);
    }
    catch(Exception e)
    {
      e.printStackTrace();
    }
  }
  
  
  private void getDriverInfo(ObjectConnection oc) 
  {
    try
    {
      Connection connection = layer.getConnection();
      DatabaseMetaData dbmd = connection.getMetaData();
      String info = dbmd.getDriverName() + " " + dbmd.getDriverVersion();
      connection.close();
      
      oc.write(info);      
    } catch(Exception e) {
      e.printStackTrace();
    }
  }
}