Mybatis分页插件PageHelper配置及使用方法详解

环境

框架：spring+springmvc+mybatis

pom.xml

    
      com.github.pagehelper
      pagehelper
      5.1.2
    

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

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 roleList;
	public List getRoleList() {
		return roleList;
	}
	public void setRoleList(List 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;

@Repository
public interface UserMapper {
  /**
   * 多条件分页查询
   * @param userParam
   * @return
   */
  public List 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

 
  SELECT
     *
  FROM
    `user` 
  
     
     AND id = #{id}
    
    
     AND uname = #{uname}
    
    
     AND name like '%${name}%'
    
    
     AND phone like '%${phone}%'
    
    
     AND company like '%${company}%'
    
    
     AND jobTitle like '%${jobtitle}%'
    
    
     AND birth like '%${birth}%'
    　　
 

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;

@Service
public 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 userList = userMapper.queryByPage(userParam);
    PageInfo pageInfo = new PageInfo(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 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 list=securityRiskLibaryDAO.queryList(srl);
PageInfo page=new PageInfo(list);
page.getTotal();
page.xxxx

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。