一:分页
导入包
<dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>5.1.2</version> </dependency>
在beans-datasoure.xml中加入配置信息
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--分页--> <!-- 别名 --> <property name="typeAliasesPackage" value="com.cc.entity"></property> <!-- mapper XML映射 --> <property name="mapperLocations" value="classpath*:mapper/*Mapper.xml"></property> <!-- 数据源 --> <property name="dataSource" ref="dataSource"></property> <property name="plugins"> <array> <bean class="com.github.pagehelper.PageInterceptor"> <!-- 这里的几个配置主要演示如何使用,如果不理解,一定要去掉下面的配置 --> <property name="properties"> <value> helperDialect=mysql reasonable=true supportMethodsArguments=true params=count=countSql autoRuntimeDialect=true </value> </property> </bean> </array> </property> </bean>
修改UsersService中查询Users返回的list,注意PageNum,pageSize是最好不要改为其他名字
List<Users> list(int pageNum,int pageSize);
修改实现类里面的内容
@Override public List<Users> list(int pageNum,int pageSize) { PageHelper.startPage(pageNum, pageSize); return usersMapper.selectByExample(null); }
最后修改Controller,这里我给的默认值pageNum为1,pageSize为2
@RequestMapping(value = "/list") public ModelAndView list(@RequestParam(value="pageNum",defaultValue = "1") int pageNum,@RequestParam(value="pageSize",defaultValue = "2")int pageSize) { // public ModelAndView list() { ModelAndView mv= new ModelAndView(); //1.调用用户的service层的方法获取所有用户所有数据 List<Users> userses = userService.list(pageNum,pageSize); // 将集合转为Page Page<Users> page = (Page)userses; System.out.println("page====="+page); //2.将数据绑定mv上 mv.addObject("userses",userses); //3.设置视图 mv.setViewName("user/list"); //4.放回mv return mv; }
效果:
看下数据库里的数据一共有多少条
没错,只显示了前两条,按2条分页了
二:接下来实现批量删除
在原有的list.jsp中加入一个from表单,用于提交所选的内容有几条
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <script src="https://cdn.bootcdn.net/ajax/libs/javascript-state-machine/2.0.0/state-machine.min.js"></script> </head> <body> <form action="${pageContext.request. contextPath}/user/delBatch"> <table width="80%" border="1"> <thead> <tr> <th><input type="checkbox" id="totalCheck" /> </th> <th>编号</th> <th>姓名</th> <th>性别</th> <th>生日</th> <th>地址</th> <th>操作</th> </tr> </thead> <tbody id="list"> <c:forEach items="${userses}" var="user"> <tr> <th><input type="checkbox" id="user_check" name="ids" value="${user.id}" /></th> <th>${user.id }</th> <th>${user.username}</th> <th>${user.sex}</th> <th>${user.birthday }</th> <th>${user.address}</th> <th> <a href="${pageContext.request. contextPath}/user/to_edit?uid=${user.id}">修改</a> <a href="${pageContext.request. contextPath}/user/to_add">增加</a> <a href="javascript:doDel('http://localhost:8080/user/delete?uid=${user.id}')" >删除</a> <a href="javascript:remove('http://localhost:8080/user/delete/${user.id}')">删除(rest)</a> </th> </tr> </c:forEach> </tbody> <tr> <th colspan="7" align="left"> <input type="submit" value="删除"/> </th> </tr> </table> </form> </body> <script type="text/javascript"> $(function() { $("#totalCheck").click(function() { if (this.checked) { $("#list :checkbox").prop("checked", true); } else { $("#list :checkbox").prop("checked", false); } }); }); function doDel(url) { if (confirm("确定删除吗?")){ location.href=url; } } </script> </html>
在接口中增加一个新的方法
int deleteBatch(Integer[] ids);
实现接口中的方法
@Override public int deleteBatch(Integer[] ids) { // TODO Auto-generated method stub return usersMapper.deleteBatch(ids); }
编写Controller
/** * @Title: deleteBatch * @Description: 批量删除 * @param @param ids * @param @return * @return String * @throws */ @RequestMapping("/delBatch") public String deleteBatch(Integer[] ids) { System.out.println("====进入deleteBatch===ids"+ids); //1.调用service层的批量删除的方法 int nums = userService.deleteBatch(ids); if(nums==ids.length) { //2.跳转到首页 return "redirect:list"; }else { //3.跳转到错误页面 return "error"; } }
测试:
选中两条数据,点击下面删除按钮提交,查看数据库,很明显,删除成功
想在ide中查看sql执行操作的可以加上log4j
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender"> <param name="Encoding" value="UTF-8" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m (%F:%L) \n" /> </layout> </appender> <logger name="java.sql"> <level value="debug" /> </logger> <logger name="org.apache.ibatis"> <level value="info" /> </logger> <root> <level value="debug" /> <appender-ref ref="STDOUT" /> </root> </log4j:configuration>