").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 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 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：
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。
看完上述内容，你们掌握使用Spring MVC与Mybatis如何对Mysql数据库进行分页查询的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
分享名称：使用SpringMVC与Mybatis如何对Mysql数据库进行分页查询
本文网址：http://cdkjz.cn/article/ipesdo.html
