在SpringMVC中使用Mybatis怎么实现对Mysql数据库进行分页查询

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>



 
   
   
   
   
  
 
 
 
   

     

       

         
ID
         
姓名
         
年龄
         
性别
       
     
     显示数据
   
 

Pager.getSpan = function(value,className){
  return $(""+value+"");
}
function Pager($parent){
  this.$parent = $parent;
  this.pageCallBack = $.noop;
  this.preVal = "＜";
  this.nextVal = "＞";
  this.splitChar = "…";
  this.init();
  this.spaceStep = 2;
}
Pager.prototype.setPageCallBack = function(pageCallBack){
  this.pageCallBack = pageCallBack;
  return this;
}
Pager.prototype.init = function(){
  if(this.$parent.length == 0){
    alert("pagediv not exists ");
  }
  this.$divRow = $("
").appendTo(this.$parent);
  this.$div = $("
").appendTo(this.$parent);
}
Pager.prototype.clear = function(){
  this.$div.empty();
  this.$divRow.empty();
}
Pager.prototype.addSpan = function(value,className){
  var $span = Pager.getSpan(value,className).appendTo(this.$numdiv);
  $span.css("width",this.getSpanWidth(value)+"px");
  return $span;
}
Pager.prototype.getSpanWidth = function(value){
  var width = 21;
  var curNeed = 0;
  if(!isNaN(value)){
    curNeed = value.toString().length * 8;
  }
  return curNeed>width?curNeed:width;
}
Pager.prototype.disable = function($span,flag){
  var removeClass = flag?"nable cursor_pointer":"disable cursor_default";
  var addClass = flag?"disable cursor_default":"nable cursor_pointer";
  $span.removeClass(removeClass).addClass(addClass);
  return $span;
}
Pager.prototype.show = function(pageCount,curPage,rowCount){
  alert(0)
  this.clear();
  this.$divRow.html("　　共有"+pageCount+"页，"+rowCount+"条数据");
  pageCount = pageCount?pageCount-0:0;
  if(pageCount<=0){
    return;
  }
  var self = this;
  this.$prev = Pager.getSpan(this.preVal,"toBtn").appendTo(this.$div);
  this.$numdiv = $("
").appendTo(this.$div);
  this.$nextVal = Pager.getSpan(this.nextVal,"toBtn").appendTo(this.$div);
  curPage = curPage?curPage-0:1;
  curPage = curPage<1?1:curPage;
  curPage = curPage>pageCount?pageCount:curPage;
  this.disable(this.$prev,curPage == 1);
  if(curPage>1){
    this.$prev.click(function(){
        self.pageCallBack(curPage-1);
      });
  }
  this.disable(this.$nextVal,curPage == pageCount);
  if(curPagethis.spaceStep && icurEnd && ithis.spaceStep) || (i==curEnd && i
下面是Mytable的实现代码：
function MyTable(tabName,url){
  this.$tab = $("."+tabName);
  this.$wrap = this.$tab.parent();
  this.queryURL = url;
  this.queryData = null;
  this.pager = null;
  this.init();
}
MyTable.prototype.init = function(){
  this.pager = new Pager($("
").insertAfter(this.$wrap))
      .setPageCallBack($.proxy(this.gotoPage,this));
  this.gotoPage(1);
}

MyTable.prototype.gotoPage = function(curPage){
  if(curPage){
    this.queryData = {"curPage":curPage};
  }
  $.post(this.queryURL,this.queryData,$.proxy(this.show,this),"json");
}

MyTable.prototype.show = function(data){
  this.clear();
  var list = data.list;
  var len = list.length;
  var df = document.createDocumentFragment();
  for(var i=0;i");
    var $id = $(""+list[i].id+"").appendTo($tr);
    var $name = $(""+list[i].name+"").appendTo($tr);
    var $age = $(""+list[i].age+"").appendTo($tr);
    var $sex = $(""+list[i].sex+"").appendTo($tr);
    df.appendChild($tr[0]);
  }
  this.$tab[0].appendChild(df);
  this.pager.show(data.pager.pageCount, data.pager.curPage, data.pager.rowCount);
}

MyTable.prototype.clear = function(){
  this.$tab.empty();
}
前端页面的处理就是这些，展示效果如下：
第三步：后台的处理
后台的处理很简单，因为是自己写的数据，所以没有做太复杂的处理，首先我先把数据库的数据贴出来
一共18条数据，四个字段，id为主键。下面是controller处理前端请求的代码：
package cn.wangze.controller;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import cn.wangze.domain.Employee;
import cn.wangze.domain.Pager;
import cn.wangze.service.BaseService;

@Controller
@RequestMapping("/mam")
public class BaseController extends SuperController{
                                                                                                                                
  @Autowired
  private BaseService baseService;
  
  @RequestMapping(value="/queryListPage")
  public void queryListPage(Employee employee, Pager pager, HttpServletResponse response){
    if(employee == null || pager == null){
      sendError("参数错误",response);
    }
    sendJsonPager(pager, baseService.queryListPage(employee,pager), response);
  }
}
这个页面涉及到了前端返回值得处理，sendError和sendJsonPager方法在它的父类中有声明，代码如下：
public void sendParam(boolean successFlag,Object key,Object value,HttpServletResponse response){
    StringBuffer sb = append(null,SUCCESS,successFlag?SUCCESS:ERROR);
    if(!isEmpty(key)){
      append(sb,key,value);
    }
    if(!MESSAGE.equals(key)){
      append(sb,MESSAGE,successFlag?"操作已成功":"操作以失败");
    }
    writeJsonBuffer(sb.append("}"),response);
}

public void sendMsg(boolean successFlag,String errmsg,HttpServletResponse response){
    sendParam(successFlag,MESSAGE,errmsg,response);
}

public void sendError(String msg,HttpServletResponse response){
    sendMsg(false,msg,response);
}
public void sendJsonPager(Pager pager, List<? extends JsonEntity> list, int i, HttpServletResponse response){
    StringBuffer sb = append(null, MESSAGE, "success");
    if(list==null || list.size()==0){
      sendMsg(false, "查无数据", response);
    }else{
      sb.append(",").append(getJsonList(list,i)).append(pager.toJsonString());
    }
    sb.append("}");
    logger.debug(sb);
    HtmlUtil.writer(response, sb.toString());
  }
  
  public void sendJsonPager(Pager pager, List<? extends JsonEntity> list, HttpServletResponse response){
    sendJsonPager(pager, list, 0, response);
  }  

 通过上面BaseController的处理，我们可以看到它调用了BaseService的queryListPager方法， 
package cn.wangze.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import cn.wangze.domain.Pager;
import cn.wangze.mapper.BaseMapper;

@Service
public class BaseService {
  
  @Autowired
  private BaseMapper baseMapper;
  
  public Pager queryRowCount(T t, Pager pager){
    return pager.initRowCount(baseMapper.queryRowCount(t));
  }
  
  public List queryListPage(T t, Pager pager){
    pager = this.queryRowCount(t,pager);
    if(pager == null) return null;
    return baseMapper.queryListPage(t, pager.getPageSize(), pager.getStart());
  }
}
BaseServie的queryRowCount方法先查询了一下数据的总条数，然后调用了BaseMapper的queryListPage方法，我们来看一下：
package cn.wangze.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Param;

public interface BaseMapper {
  public int queryRowCount(T t);
  public List queryListPage(@Param("t") T t,@Param("end") Integer end,@Param("start") Integer start);
}
这个BaseMapper对应的是mybatis的xml文件，它负责编写sql语句：
<?xml version="1.0" encoding="UTF-8"?>


  
    id,name,age,sex
  
  
    t.id,t.name,t.age,t.sex
  
  
    #{id},#{name},#{age},#{sex}
  
  
    where 1=1 
    and id=#{id}
    and name=#{name}
    and age=#{age}
    and sex=#{sex}
  
  
    where 1=1 
    and t.id=#{t.id}
    and t.name=#{t.name}
    and t.age=#{t.age}
    and t.sex=#{t.sex}
  
  
    set 
    
      id=#{id},
      name=#{name},
      age=#{age},
      sex=#{sex},
    
    
  
    select count(1) from employee 
  
  
  
    select  from employee limit #{start},#{end};
  
最后我们看下employee和pager的实体类把： 
package cn.wangze.domain;

public class Employee extends JsonEntity{
  private int id;
  private String name;
  private String age;
  private String sex;
  public int getId() {
    return id;
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getAge() {
    return age;
  }
  public void setAge(String age) {
    this.age = age;
  }
  public String getSalary() {
    return sex;
  }
  public void setSalary(String sex) {
    this.sex = sex;
  }
  @Override
  protected void addJsonFields(int i) {
    addField("id", id).addField("name",name).addField("age", age).addField("sex", sex);
  }
  
  @Override
  public String toString() {
    return "id:"+id+",name:"+name+",age:"+age+",sex:"+sex;
  }
}
package cn.wangze.domain;

public class Pager {
  private int curPage = 1;
  private int pageSize = 5;
  private int start = 0;
  private int end = 0;
  private int pageCount;
  private int rowCount;
  public int getCurPage() {
    return curPage;
  }
  public void setCurPage(int curPage) {
    this.curPage = curPage;
  }
  public int getPageSize() {
    return pageSize;
  }
  public void setPageSize(int pageSize) {
    this.pageSize = pageSize;
  }
  public int getStart() {
    return start;
  }
  public void setStart(int start) {
    this.start = start;
  }
  public int getEnd() {
    return end;
  }
  public void setEnd(int end) {
    this.end = end;
  }
  public int getPageCount() {
    return pageCount;
  }
  public void setPageCount(int pageCount) {
    this.pageCount = pageCount;
  }
  public int getRowCount() {
    return rowCount;
  }
  public void setRowCount(int rowCount) {
    this.rowCount = rowCount;
  }
  
  public Pager initRowCount(int rowCount) {
    if (rowCount == 0) {
      return null;
    }
    int ps = getPageSize();
    if (ps == 0) {
      ps = 5;
    }
    int pc = (rowCount + ps - 1) / ps;//
    int cp = getCurPage();
    cp = cp > pc ? pc : cp;
    cp = cp < 1 ? 1 : cp;
    this.setPageCount(pc);
    this.setCurPage(cp);
    this.setEnd(cp * ps );
    this.setStart((cp - 1) * ps);
    this.rowCount = rowCount;
    return this;
  }
  
  public StringBuffer toJsonString() {
    return new StringBuffer(","+"\"pager\":{\"curPage\":\"" + this.curPage
        + "\",\"pageCount\":\"" + this.pageCount + "\",\"rowCount\":\""
        + this.rowCount + "\"}");
  }

  @Override
  public String toString() {
    return "Pager [curPage=" + curPage + ", pageSize=" + pageSize
        + ", start=" + start + ", end=" + end + ", pageCount="
        + pageCount + ", rowCount=" + rowCount + "]";
  }
}
不知道你还记不记得在BaseService的处理方法里面调用了pager的initRowCount方法没，这个方法就是判断当前执行到第几页，从哪个数字开始，到那个数字结束，是分页查询里面一个很关键的方法。
第四步：通过前后端的配合，看下实现后效果：
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            文章名称：在SpringMVC中使用Mybatis怎么实现对Mysql数据库进行分页查询            

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