Mybatis分页插件PageHelper配置及使用方法详解

环境

框架：spring+springmvc+mybatis

pom.xml

<!-- 引入mybatis的 pagehelper 分页插件 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>5.1.2</version> </dependency>

配置全局配置文件

在mybatis的全局配置文件中配置PageHelper分页插件

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE configurationPUBLIC '-//mybatis.org//DTD Config 3.0//EN''http://mybatis.org/dtd/mybatis-3-config.dtd'><configuration> <!-- 引入 pageHelper插件 --> <!--注意这里要写成PageInterceptor, 5.0之前的版本都是写PageHelper, 5.0之后要换成PageInterceptor--> <plugins> <plugin interceptor='com.github.pagehelper.PageInterceptor'> <!--reasonable：分页合理化参数，默认值为false,直接根据参数进行查询。 当该参数设置为 true 时，pageNum<=0 时会查询第一页， pageNum>pages（超过总数时），会查询最后一页。--> <!--<property name='reasonable' value='true'/>--> </plugin> </plugins></configuration>

使用

例如：实现对用户的多条件查询

package com.szfore.model;import java.util.Date;import java.util.List;public class User {private Integer id;private String uname;private String pwd;private String name;private Integer sex;private String phone;private String company;private String jobtitle;private String birth;private Date createdate;private Date lastlogintime;private List<Role> roleList;public List<Role> getRoleList() {return roleList;}public void setRoleList(List<Role> roleList) {this.roleList = roleList;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getUname() {return uname;}public void setUname(String uname) {this.uname = uname == null ? null : uname.trim();}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd == null ? null : pwd.trim();}public String getName() {return name;}public void setName(String name) {this.name = name == null ? null : name.trim();}public Integer getSex() {return sex;}public void setSex(Integer sex) {this.sex = sex;}public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone == null ? null : phone.trim();}public String getCompany() {return company;}public void setCompany(String company) {this.company = company == null ? null : company.trim();}public String getJobtitle() {return jobtitle;}public void setJobtitle(String jobtitle) {this.jobtitle = jobtitle == null ? null : jobtitle.trim();}public String getBirth() {return birth;}public void setBirth(String birth) {this.birth = birth == null ? null : birth.trim();}public Date getCreatedate() {return createdate;}public void setCreatedate(Date createdate) {this.createdate = createdate;}public Date getLastlogintime() {return lastlogintime;}public void setLastlogintime(Date lastlogintime) {this.lastlogintime = lastlogintime;}}

UserMapper

注意：mapper中就按不分页的那种写法就好

package com.szfore.dao;import com.szfore.model.User;import com.szfore.model.UserExample;import java.util.List;import org.apache.ibatis.annotations.Param;import org.springframework.stereotype.Repository;@Repositorypublic interface UserMapper { /** * 多条件分页查询 * @param userParam * @return */ public List<User> queryByPage(User userParam);}

UserMapper.xml

注意：sql中就不要写limit了，pageHelp会自己处理，sql就按不分页的那种写法就好

<!--多条件分页查询用户--> <select resultType='com.szfore.model.User'> SELECT * FROM `user` <WHERE> <if test='id != null and id != ’’'> AND id = #{id} </if> <if test='uname != null and uname != ’’'> AND uname = #{uname} </if> <if test='name != null and name != ’’'> AND name like ’%${name}%’ </if> <if test='phone != null and phone != ’’'> AND phone like ’%${phone}%’ </if> <if test='company != null and company != ’’'> AND company like ’%${company}%’ </if> <if test='jobtitle != null and jobtitle != ’’'> AND jobTitle like ’%${jobtitle}%’ </if> <if test='birth != null and birth != ’’'> AND birth like ’%${birth}%’ </if></WHERE> </select>

UserServiceImpl

package com.szfore.service.impl;import com.github.pagehelper.PageHelper;import com.github.pagehelper.PageInfo;import com.szfore.dao.MenuMapper;import com.szfore.dao.UserMapper;import com.szfore.dao.UserRoleMapper;import com.szfore.model.*;import com.szfore.service.IUserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;import javax.servlet.http.HttpSession;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;@Servicepublic class UserServiceImpl implements IUserService{ @Autowired private UserMapper userMapper; @Autowired private MenuMapper menuMapper; @Autowired private UserRoleMapper userRoleMapper; /** * 多条件分页查询用户 * @param userParam * @param pageNum * @param pageSize * @return */ public Json queryByPage(User userParam,Integer pageNum,Integer pageSize) { //利用PageHelper分页查询 注意：这个一定要放查询语句的前一行,否则无法进行分页,因为它对紧随其后第一个sql语句有效 PageHelper.startPage(pageNum, pageSize); List<User> userList = userMapper.queryByPage(userParam); PageInfo<User> pageInfo = new PageInfo<User>(userList); Json json = new Json(); json.setMsg('成功！'); json.setObj(pageInfo); json.setSuccess(true); return json; }}

说明：PageInfo是PageHelper自带的分页对象类，详情如下：

当前页private int pageNum;每页的数量private int pageSize;当前页的数量private int size;//由于startRow和endRow不常用，这里说个具体的用法 //可以在页面中'显示startRow到endRow 共size条数据'

当前页面第一个元素在数据库中的行号private int startRow;当前页面最后一个元素在数据库中的行号private int endRow;总记录数private long total;总页数private int pages;结果集private List<T> list;

第一页private int firstPage;前一页private int prePage;

是否为第一页private boolean isFirstPage = false;是否为最后一页private boolean isLastPage = false;是否有前一页private boolean hasPreviousPage = false;是否有下一页private boolean hasNextPage = false;导航页码数private int navigatePages;所有导航页号private int[] navigatepageNums;

通过PageInfo获取其他信息

PageHelper.startPage(req.getCurrentPage(), req.getPageSize(), true);List<SecurityRiskLibary> list=securityRiskLibaryDAO.queryList(srl);PageInfo page=new PageInfo(list);page.getTotal();page.xxxx

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