pyexr2f4a/dao文件/electriDao.java

package com.dao;



import com.bean.electric_addBean;
import com.db.DBHelper;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
public class electriDao {
    //获取列表

    public List<electric_addBean> GetList(String strwhere,String strorder){
      String sql="select * from electric";
       if(!(isInvalid(strwhere)))
       {
           sql+=" where "+strwhere;
       }if(!(isInvalid(strorder)))
       {
          sql+=" order by "+strorder;
      }
       Statement stat = null;
       ResultSet rs = null;
      Connection conn = new DBHelper().getConn();
       List<electric_addBean> list=new ArrayList<electric_addBean>();
       try{
            stat = conn.createStatement();
         rs = stat.executeQuery(sql);
           while(rs.next()){
               electric_addBean cnbean=new electric_addBean();
               cnbean.setElectric_ID(rs.getInt("Electric_ID"));
               cnbean.setElectric_Dormitory_Number(rs.getString("Electric_Dormitory_Number"));
               cnbean.setElectric_Residual(rs.getString("Electric_Residual"));
               list.add(cnbean);
         }
       } catch (SQLException e) {
           e.printStackTrace();
      } finally {
           try {
               if (conn != null)
                   conn.close();
               if (stat != null)
                  stat.close();
              if (rs != null)
                  rs.close();
           } catch (SQLException e) {
               e.printStackTrace();
           }
       }
       return list;
   }

    public electric_addBean GetBean(int id){
        String sql="select * from electric where Electric_ID="+id;
        Statement stat = null;
        ResultSet rs = null;
        Connection conn = new DBHelper().getConn();
        electric_addBean cnbean=new electric_addBean();
        try{
            stat = conn.createStatement();
            rs = stat.executeQuery(sql);
            while(rs.next()){
//                cnbean.setTeacher_ID(rs.getInt("Teacher_ID"));
                cnbean.setElectric_ID(rs.getInt("Electric_ID"));
                cnbean.setElectric_Dormitory_Number(rs.getString("Electric_Dormitory_Number"));
                cnbean.setElectric_Residual(rs.getString("Electric_Residual"));

            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (conn != null)
                    conn.close();
                if (stat != null)
                    stat.close();
                if (rs != null)
                    rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        return  cnbean;
    }
    public void Add(electric_addBean cnbean){
        String sql="insert into electric (";
        sql+="Electric_ID,Electric_Dormitory_Number,Electric_Residual";
        sql+=") values(";
        sql+="'"+cnbean.getElectric_ID()+"','"+cnbean.getElectric_Dormitory_Number()+"','"+cnbean.getElectric_Residual()+"'";
        sql+=")";
        Statement stat = null;
        ResultSet rs = null;
        Connection conn = new DBHelper().getConn();
        try{
            stat = conn.createStatement();
            stat.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (conn != null)
                    conn.close();
                if (stat != null)
                    stat.close();
                if (rs != null)
                    rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    //修改
    public void Update(electric_addBean cnbean){
        String sql="update electric set ";
        //sql+="Electric_Domitory_Number='"+cnbean.getElectric_Dormitory_Number()+"',";
        sql+="Electric_Residual='"+cnbean.getElectric_Residual()+"'";
//        sql+="Student_Password='"+cnbean.getStudent_Password()+"',";

        sql+=" where Electric_ID='"+cnbean.getElectric_ID()+"'";
        Statement stat = null;
        ResultSet rs = null;
        Connection conn = new DBHelper().getConn();
        try{
            stat = conn.createStatement();
            stat.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (conn != null)
                    conn.close();
                if (stat != null)
                    stat.close();
                if (rs != null)
                    rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    public electric_addBean GetAllBean(int id){
        String sql="select * from electric where Electric_ID="+id;
        Statement stat = null;
        ResultSet rs = null;
        Connection conn = new DBHelper().getConn();
        electric_addBean cnbean=new electric_addBean();
        try{
            stat = conn.createStatement();
            rs = stat.executeQuery(sql);
            while(rs.next()){
                cnbean.setElectric_ID(rs.getInt("Electric_ID"));
                cnbean.setElectric_Dormitory_Number(rs.getString("Electric_Dormitory_Number"));
                cnbean.setElectric_Residual(rs.getString("Electric_Residual"));

            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (conn != null)
                    conn.close();
                if (stat != null)
                    stat.close();
                if (rs != null)
                    rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        return cnbean;
    }
    private boolean isInvalid(String value) {
        return (value == null || value.length() == 0);
    }
}