SpringMvc学习-增删改查
本节主要介绍SpringMVC简单的增删改查功能。
1.查询
dao中的代码
- public List<WeatherPojo> getAllWeather(){
- String sql="select * from weathertest";
- List<WeatherPojo> pojos=new ArrayList<WeatherPojo>();
- pojos= jdbcTemplate.query(sql,new RowMapper() {
- @Override
- public Object mapRow(ResultSet rs, int arg1) throws SQLException {
- // TODO Auto-generated method stub
- WeatherPojo weather=new WeatherPojo();
- weather.setName(rs.getString("name"));
- weather.setPassword(rs.getString("password"));
- weather.setId(rs.getInt("id"));
- return weather;
- }
- });
- return pojos;
- }
查询
同事,还可以写service和serviceimpl。需要对jdmctempl添加注解
@Autowired
private JdbcTemplate jdbcTemplate;
在impl中需要对dao添加注解
@Autowired
private WeatherDao weatherDao;
在controller中调用服务
- @Autowired
- private WeatherServiceImpl weatherService;
- @RequestMapping(params="method=query")
- public ModelAndView getAllWeather(HttpServletRequest request,HttpServletResponse response){
- List<WeatherPojo> pojos=weatherService.getWeatherList();
- request.setAttribute("weathers", pojos);
- System.out.println(pojos.get(0).getName());
- return new ModelAndView("weatherlist");
- }
通过modelandview返回页面,页面代码如下:
- <%@ page language="java" contentType="text/html; charset=utf-8"
- pageEncoding="utf-8"%>
- <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
- <%String path = request.getContextPath();
- String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
- %>
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- <title>Insert title here</title>
- </head>
- <body>
- <div><a href="<%=basePath %>weather.do?method=add">添加</a></div>
- <div>
- <table>
- <thead>
- <tr>
- <th>姓名</th>
- <th>说明</th>
- <th>操作</th>
- </tr>
- </thead>
- <tbody>
- <c:forEach var="item" items="${weathers}">
- <tr>
- <td>${item.name }</td>
- <td>${item.password }</td>
- <td></td>
- <td><a href="<%=basePath %>weather.do?method=edit&id=${item.id}">编辑</a><a href="<%=basePath %>weather.do?method=delete&id=${item.id}">删除</a></td>
- </tr>
- </c:forEach>
- </tbody>
- </table>
- </div>
- </body>
- </html>
list
2.增加
dao中代码
- public void addWeather(WeatherPojo weather){
- String sql="insert into weathertest(id,name,password) values("+weather.getId()+",'"+weather.getName()+"','"+weather.getPassword()+"')";
- jdbcTemplate.execute(sql);
- }
controller代码,get方法是进入新增页面,页面传递空对象。post方法为添加新的记录
- @RequestMapping(params="method=add",method=RequestMethod.GET)
- public ModelAndView addWeather(HttpServletRequest request,HttpServletResponse reponse){
- request.setAttribute("weather", new WeatherPojo());
- return new ModelAndView("weatheradd");
- }
- @RequestMapping(params="method=add",method=RequestMethod.POST)
- public ModelAndView addWeather(WeatherPojo weather){
- weatherService.addWeather(weather);
- return new ModelAndView("redirect:/weather.do?method=query");
- }
jsp页面代码
- <%@ page language="java" contentType="text/html; charset=utf-8"
- pageEncoding="utf-8"%>
- <%String path = request.getContextPath();
- String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
- %>
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- <title>Insert title here</title>
- </head>
- <body>
- <form action="<%=basePath%>weather.do?method=add" method="post">
- <label for="id">id</label>
- <input name="id"/><br>
- <label for="name">name</label>
- <input name="name"><br>
- <label for="password">password</label>
- <input name="password"><br>
- <input type="submit" value="提交">
- </form>
- </body>
- </html>
3.修改
dao中代码:
- public void editWeather(WeatherPojo weather){
- String sql="update weathertest set name='"+weather.getName()+"',password='"+weather.getPassword()+"' where id="+weather.getId()+"";
- jdbcTemplate.execute(sql);
- }
controller代码
- @RequestMapping(params="method=edit",method=RequestMethod.GET)
- public ModelAndView editWeather(HttpServletRequest request,HttpServletResponse response){
- int id=Integer.valueOf(request.getParameter("id"));
- WeatherPojo weather=new WeatherPojo();
- weather=weatherService.getWeatherById(id);
- ModelAndView mav=new ModelAndView("editweather");
- request.setAttribute("weather", weather);
- System.out.println("--------"+weather.getId());
- System.out.println("--------"+weather.getName());
- System.out.println("--------"+weather.getPassword());
- return mav;
- }
- @RequestMapping(params="method=edit",method=RequestMethod.POST)
- public ModelAndView editWeather(WeatherPojo weather){
- weatherService.editWeather(weather);
- return new ModelAndView("redirect:/weather.do?method=query");
- }
jsp页面:
- <%@ page language="java" contentType="text/html; charset=utf-8"
- pageEncoding="utf-8"%>
- <%String path = request.getContextPath();
- String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
- %>
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- <title>Insert title here</title>
- </head>
- <body>
- <form action="<%=basePath%>weather.do?method=edit" method="post">
- <label for="id">id</label>
- <input name="id" readonly="true" value="${weather.id }"/><br>
- <label for="name">name</label>
- <input name="name" value="${weather.name }"><br>
- <label for="password" >password</label>
- <input name="password" value="${weather.password }"><br>
- <input type="submit" value="提交">
- </form>
- </body>
- </html>
4.删除
dao中代码:
- //delete
- public void deleteWeather(int id){
- String sql="delete from weathertest where id="+id;
- jdbcTemplate.execute(sql);
- }
controller代码:
- @RequestMapping(params="method=delete",method=RequestMethod.GET)
- public ModelAndView deleteWeather(HttpServletRequest request,HttpServletResponse response){
- int id=Integer.valueOf(request.getParameter("id"));
- weatherService.deleteWeather(id);
- //页面重定向
- return new ModelAndView("redirect:/weather.do?method=query");
- }
jsp代码:
- <%@ page language="java" contentType="text/html; charset=utf-8"
- pageEncoding="utf-8"%>
- <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
- <%String path = request.getContextPath();
- String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
- %>
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- <title>Insert title here</title>
- </head>
- <body>
- <div><a href="<%=basePath %>weather.do?method=add">添加</a></div>
- <div>
- <table>
- <thead>
- <tr>
- <th>姓名</th>
- <th>说明</th>
- <th>操作</th>
- </tr>
- </thead>
- <tbody>
- <c:forEach var="item" items="${weathers}">
- <tr>
- <td>${item.name }</td>
- <td>${item.password }</td>
- <td></td>
- <td><a href="<%=basePath %>weather.do?method=edit&id=${item.id}">编辑</a><a href="<%=basePath %>weather.do?method=delete&id=${item.id}">删除</a></td>
- </tr>
- </c:forEach>
- </tbody>
- </table>
- </div>
- </body>
- </html>
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