treedao.java

js 异步加载 tree 采用ajax技术

package yuwu.cn.com.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import yuwu.cn.com.vo.LineVO;
import yuwu.cn.com.vo.StationVO;
import yuwu.cn.com.vo.Transformer;
public class TreeDAO {
	
	/**
	 *查找所以的电站 
	 */
	public List getStation(){
		List<StationVO> list = new ArrayList<StationVO>();
    	Connection conn = null;
    	PreparedStatement ps = null;
    	ResultSet rs = null;
    	try{
    		String sql = "SELECT StationName,StationId FROM Station ";
    		conn = DaoFactory.getInstance().getConnection("ORACLE");
    		ps = conn.prepareStatement(sql);
    		rs = ps.executeQuery();
    		while(rs.next()){
    			StationVO vo = new StationVO();
    			vo.setStationId(rs.getLong("stationId"));
    			vo.setStationName(rs.getString("stationName"));
    			list.add(vo);
    		}
    	}catch(SQLException sqle){
    		sqle.getStackTrace();
    	}finally{
    		try {
				rs.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				ps.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				conn.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    	}
    	return list;
	}
	
	/**
	 *@param 电站Id,根据电站Id找下面的线路 
	 */
	public List getLine(long stationId){
		List<LineVO> list = new ArrayList<LineVO>();
    	Connection conn = null;
    	PreparedStatement ps = null;
    	ResultSet rs = null;
    	try{
    		String sql = "SELECT lineName,lineAddress,lineId,StationId FROM line where StationId =?";
    		conn = DaoFactory.getInstance().getConnection("ORACLE");
    		ps = conn.prepareStatement(sql);
    		ps.setLong(1, stationId);
    		rs = ps.executeQuery();
    		while(rs.next()){
    			LineVO vo = new LineVO();
    			vo.setLindId(rs.getLong("lineId"));
    			vo.setLineName(rs.getString("lineName"));
    			vo.setLineAddress(rs.getString("lineAddress"));
    			vo.setStationId(rs.getLong("StationId"));
    			list.add(vo);
    		}
    	}catch(SQLException sqle){
    		sqle.getStackTrace();
    	}finally{
    		try {
				rs.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				ps.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				conn.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    	}
    	return list;
	}
	
	/**
	 *@param 电站Id,根据电站Id找下面的线路 
	 */
	public List getTransformer(long lineId){
		List<Transformer> list = new ArrayList<Transformer>();
    	Connection conn = null;
    	PreparedStatement ps = null;
    	ResultSet rs = null;
    	try{
    		String sql = "SELECT name,commId,protocolId,frontName FROM Transformer where lineId =?";
    		conn = DaoFactory.getInstance().getConnection("ORACLE");
    		ps = conn.prepareStatement(sql);
    		ps.setLong(1, lineId);
    		rs = ps.executeQuery();
    		while(rs.next()){
    			Transformer vo = new Transformer();
    			vo.setName(rs.getString("name"));
    			vo.setFrontName(rs.getString("frontName"));
    			vo.setProtocolId(rs.getString("protocolId"));
    			vo.setCommId(rs.getLong("commId"));
    			list.add(vo);
    		}
    	}catch(SQLException sqle){
    		sqle.getStackTrace();
    	}finally{
    		try {
				rs.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				ps.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				conn.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    	}
    	return list;
	}

}