Pagination plug-in queries

springmvc-servlet configuration:

<bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <!--<property name="typeAliases" value="cn.kgc.util.PageUtil"/>-->
    <property name="typeAliasesPackage" value="cn.kgc.vo;cn.kgc.util"/>
    <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    <!--分页插件版本使用4的版本-->
    <property name="plugins" >
        <array>
            <bean class="com.github.pagehelper.PageHelper">
                <property name="properties">
                    <value>dialect=mysql</value>
                </property>

            </bean>
        </array>
    </property>

</bean>

 

Paging query, the control layer

package cn.kgc.controller;

import cn.kgc.service.EmpService;
import cn.kgc.vo.Emp;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.List;
import java.util.Map;

@Controller
@RequestMapping("/emp")
public class EmpController {
    @Autowired
    private EmpService empService;
    @RequestMapping ( "/ page.do") 
    public String the showPage (the Model Model, @RequestParam (value = "pageNo", 
                            required to false =, = defaultValue ". 1") Integer pageNo, 
                           @RequestParam (value = "DEPTNO", required = to false, 
                                   defaultValue = "-1") Integer DEPTNO) { 
       // set page format, valid only under the first set of 
      Page PageHelper.startPage = Page (pageNo,. 3); 
      // Sort 
        PageHelper.orderBy ( "empno desc "); 
        // query information, the affected page format 
        List <the Map <String, Object >> emplist = empService.showPage (new new Emp (deptno)); 
        model.addAttribute (" emplist ", emplist);
        // page information into PageInfo, or the front desk can not accept
        PageInfo pageinfo = new PageInfo(emplist);
       
        System.out.println(emplist);
        System.out.println(pageinfo);
        model.addAttribute("deptno",deptno);
        model.addAttribute("pageinfo", pageinfo);
        return "/main.jsp";
    }
}

Paging, mapping SQL statements xml file

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="cn.kgc.mapper.EmpMapper">


    <!--各种查询-->
    <select id="selectEmp" parameterType="Emp" resultType="map">
        select d.dname,d.loc,e.* from emp e,dept d where e.deptno=d.deptno
        <if test="empno!=null">
            and e.empno=#{empno}
        </if>
        <if test="deptno!=null and deptno!=-1">
            and d.deptno=#{deptno}
        </if>
    </select>
</mapper>

basedao Interface

cn.kgc.mapper Package; 

Import cn.kgc.vo.Emp; 
Import org.apache.ibatis.annotations.Insert; 
Import org.apache.ibatis.annotations.Update; 

Import java.util.List; 
Import Classes in java.util. the Map; 

/ ** 
. * the Created by Administrator ON 2019/6/26 
* / 
public interface EmpMapper { 

    // queries (all queries, according to empno inquiry, according to detpno query), mapper.xml 
    List <the Map <String, Object >> SelecTemp (EMP Emp); 

}

service implementation class:

package cn.kgc.service;

import cn.kgc.mapper.EmpMapper;
import cn.kgc.vo.Emp;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.List;
import java.util.Map;
@Service
@Transactional
public class EmpServiceImpl implements EmpService {
    @Autowired
    private EmpMapper empMapper;


    @Override
    public List<Map<String, Object>> showPage(Emp emp) {
        return empMapper.selectEmp(emp);
    }
}

Result set