点餐系统基于android

package com.bn.serverinfo;//声明包语句 import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Date; import java.util.List; public class DBUtil{ //创建主类 public static Connection getConnection(){ //编写与数据库建立连接的方法 Connection con = null; //声明连接 try{ Class.forName("org.gjt.mm.mysql.Driver"); //声明驱动 con = DriverManager.getConnection("jdbc:mysql://localhost/orderdish?useUnicode=true&characterEncoding=UTF-8","root","");//得到连接（数据库名，编码形式，数据库用户名，数据库密码） }catch(Exception e){ e.printStackTrace(); //捕获异常 } return con; //返回连接 } //根据员工的姓名得到id public static String getWorkeridByname(String string){ Connection con = getConnection();//与数据库建立连接 Statement st = null;//创建接口 ResultSet rs = null;//结果集 String str = null;//字符串常量 try{ st = con.createStatement();//创建一个对象来将SQL语句发送到数据库 String task = "select w_id from WorkerInfo where w_name='"+string+"';";//编写SQL语句 rs = st.executeQuery(task);//执行SQL语句 rs.next(); //遍历执行 str=rs.getString(1); //将查询得到的员工ID放入字符串常量 } catch(Exception e){ //捕获异常，返回空值 e.printStackTrace(); return null; } finally{ try {rs.close();} catch (SQLException e) {e.printStackTrace();}//结果集 try {st.close();} catch (SQLException e) {e.printStackTrace();} try {con.close();} catch (SQLException e) {e.printStackTrace();} } return str; //返回员工ID } //得到计量单位的信息 public static List<String[]> getCU(){ Connection con = getConnection();//与数据库建立连接 Statement st = null;//创建接口 ResultSet rs = null;//结果集 List<String[]>ll=new ArrayList<String[]>();//创建存放数据的列表 try{ st=con.createStatement();//创建一个对象来将SQL语句发送到数据库 String sql="select unit_id,unit_name,unit_remark from CountUnit where unit_delflg='"+0+"'";//编写SQL语句 rs=st.executeQuery(sql);//执行SQL语句 while(rs.next()){ //循环遍历结果集 String[] s=new String[3]; for(int i=0;i<s.length;i++){ s[i]=rs.getString(i+1); //将得到的信息放入字符串数组 } ll.add(s); //将字符串数据添加到列表 } }catch(Exception e){ e.printStackTrace(); //捕获异常 } finally{ try {rs.close();} catch (SQLException e) {e.printStackTrace();} try {st.close();} catch (SQLException e) {e.printStackTrace();} try {con.close();} catch (SQLException e) {e.printStackTrace();} } return ll; } ////得到计量单位的最大编号 public static String getCUMaxNO(){ Connection con = getConnection(); Statement st = null; ResultSet rs = null; String str=new String(); try{ st=con.createStatement(); String sql="select max(unit_id) from countunit"; rs=st.executeQuery(sql); rs.next(); if(rs.getString(1)==null){ str=String.valueOf(0); } else{ str=rs.getString(1); } } catch(Exception e){ e.printStackTrace(); }finally{ try {rs.close();} catch (SQLException e) {e.printStackTrace();} try {st.close();} catch (SQLException e) {e.printStackTrace();} try {con.close();} catch (SQLException e) {e.printStackTrace();} } return str; } //更新计量单位 private static Object UPDATECOUNTUNIT=new Object(); public static String updateCU(String[] getmsg){ synchronized(UPDATECOUNTUNIT){ //方法加锁 Connection con = getConnection(); Statement st = null; String idnum[]=getCountUnitID(); try{ int i; st = con.createStatement(); for( i=0;i<idnum.length;i++){ //若是已有的计量单位，就更改 if(getmsg[1].equals(idnum[i])){ String sql = "update countunit set unit_name= '"+getmsg[2]+"',unit_remark= '"+getmsg[3]+"' where unit_id="+getmsg[1]; st.executeUpdate(sql); break; } } if(i==idnum.length){ //若不是已有的，就插入 String sql="insert into countunit(unit_id,unit_name,unit_remark) values('"+getmsg[1]+"','"+getmsg[2]+"','"+getmsg[3]+"')"; st.executeUpdate(sql); } }catch(Exception e){ e.printStackTrace() ; return null; }finally{ try{st.close();}catch(Exception e) {e.printStackTrace();} try{con.close();}catch(Exception e) {e.printStackTrace();} } return "ok"; } } //得到计量单位的编号 private static String[] getCountUnitID(){ Connection con = getConnection(); Statement st = null; ResultSet rs = null; int count=getCount("countunit"); String[] ll=new String[count]; try{ st=con.createStatement(); String sql="select unit_id from countunit"; rs=st.executeQuery(sql); int k=0; System.out.println(rs.getRow()); //打印编号 while(rs.next()){ System.out.println(rs.getString(1)); ll[k]=rs.getString(1); System.out.println(ll[k]+"k="+k); k++; } }catch(Exception e){ e.printStackTrace(); } finally{ try {rs.close();} catch (SQLException e) {e.printStackTrace();} try {st.close();} catch (SQLException e) {e.printStackTrace();} try {con.close();} catch (SQLException e) {e.printStackTrace();} } return ll; } //删除计量单位信息 private static Object DELCOUNTUNIT=new Object(); public static String delCU(String id) { synchronized(DELCOUNTUNIT){ //加锁 Connection con = getConnection(); Statement st = null; try{ st = con.createStatement(); String sql = "update countunit set unit_delflg='"+1+"' where unit_id="+id; st.executeUpdate(sql); }catch(Exception e){ e.printStackTrace() ; return null; }finally{ try{st.close();}catch(Exception e) {e.printStackTrace();} try{con.close();}catch(Exception e) {e.printStackTrace();} } return "ok"; } } //根据计量单位id得到名称 public static String getCUnameById(String string) { Connection con = getConnection(); Statement st = null; ResultSet rs = null; String str = null; try{ st = con.createStatement(); String task = "select unit_name from CountUnit where unit_id='"+string+"';"; rs = st.executeQuery(task); rs.next(); str=rs.getString(1); }catch(Exception e){ e.printStackTrace(); return null; }finally{ try {rs.close();} catch (SQLException e) {e.printStackTrace();} try {st.close();} catch (SQLException e) {e.printStackTrace();} try {con.close();} catch (SQLException e) {e.printStackTrace();} } return str; } //根据员工id得到名称 public static String getWorkernameById(String string){ Connection con = getConnection(); Statement st = null; ResultSet rs = null; String str = null; try{ st = con.createStatement(); String task = "select w_name from WorkerInfo where w_id='"+string+"';"; rs = st.executeQuery(task); rs.next(); str=rs.getString(1); }catch(Exception e){ e.printStackTrace(); return null; }finally{ try {rs.close();} catch (SQLException e) {e.printStackTrace();} try {st.close();} catch (SQLException e) {e.printStackTrace();} try {con.close();} catch (SQLException e) {e.printStackTrace();} } return str; } //根据计量单位名称得到id public static String getCUidByname(String string) { Connection con = getConnection(); Statement st = null; ResultSet rs = null; String str = null; try{ st = con.createStatement(); Stri