基于mybatis插件PageHelper进行的分页查询

引言：基于ssm框架下,利用Mybaits插件PageHelper进行分页查询，可以省去大量繁琐的代码，操作起来更为方便,

1、数据库表的设计

2、创建qualification的实体类

public class Qualification {
private Integer id;

private String classification;

private String name;

private String description;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getClassification() {
return classification;
}

public void setClassification(String classification) {
this.classification = classification == null ? null : classification.trim();
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name == null ? null : name.trim();
}

public String getDescription() {
return description;
}

public void setDescription(String description) {
this.description = description == null ? null : description.trim();
}
}

3、引入PageHelper的plugins放到Mybatis.config.xml文件中

注意要导入两个jar包，放到lib目录下，一个是jsqlparser-0.9.5.jar，一个是/tracingfood/WebContent/WEB-INF/lib/pagehelper-5.0.0.jar

4、Dao层:Qualification.java(interface)编写一个接口getAll()，用来获取所有记录，分页查询时会用的到

List<Qualification> getAllQualification();//把Qualification这个类的属性封装到一个list容器里，简单点说就是仍里卖弄，getAllQualification（）这个是方法名。

5，在mybatis的Qualification.xml文件中编写sql

<select id="getAllQualification" parameterType="com.lysoc.jmi.tracing.model.Qualification" resultMap="BaseResultMap">
select * from qualification
</select>

注意mybatis.config.xml要注入映射路径:

6、业务逻辑层：实现类，QuaService

我在这里直接写实现类:

@Service//声明服务层
public class QuaService {
   @Autowired
Qualification qmap//注入mapper接口
   public List<Qualification> getAllQualification(){
       return qmap.getAllQualification();
   }

}

7、编写一个超链接向QualificatinController里的Mainpage进行分页查询

<a href="${pageContext.request.ContextPath}/Mainpage" target="rightFrame">资质信息</a>

其中pageContext.request.ContextPath表示当前页面向整个上下文Controller发出一个Mainpage的请求

8、Controller层:QualificationController

@RequestMapping("/Mainpage")

public ModelAndView Mainpage(@RequestParam(defaultValue="1") Integer currentPage,Model model,HttpServletRequest request){
       System.out.println("ok");
       PageHelper.startPage(currentPage,6);//第一个参数表示当前页，第二个参数表示一个页面为六条记录。
       List<Qualification> list=quaService.getAllQualification();//把Qualification的属性封装到list里
       PageInfo<Qualification> pageInfo=new PageInfo<Qualification>(list,6);//分页
       System.out.println(pageInfo.getList());
       model.addAttribute("pageInfo", pageInfo);//设置属性pageInfo
       return new ModelAndView("qualification_main");
       }

9、视图层：qualification_main.jsp

<table class="tablelist">
   <tr><th><input type="checkbox" name="selectall" id="selectall"/></th><th>序号</th><th>类别</th><th>名称</th><th>描述</th><th>操作</th></tr>
   <c:forEach items="${pageInfo.list}" var="qua">//获取pageInfo里的list集合，var声明一个变量qua对集合进行遍历
   <tr>
       <td><input type="checkbox" name="id" value="${qua.id }"/></td>
       <td>${qua.id}</td>
       <td>${qua.classification}</td>
       <td>${qua.name} </td>
       <td>${qua.description}</td>
       <td><a href="updateTo?id=${qua.id}" class="tablelink">更改</a> <a href="deleteById?id=${qua.id}" class="tablelink">删除</a></td>
   </tr>
   </c:forEach>

</table>

<div class="clear"></div>
    <div class="pagin">
<div class="message">共<i class="blue">${pageInfo.total }</i>条记录，当前显示第 <i class="blue">${pageInfo.pageNum } </i>页
总<i class="
blue">${pageInfo.pages }</i>页
</div>
<ul class="paginList">
<li class="paginItem"><a href="${pageContext.request.contextPath}/Mainpage?currentPage=1">首页</a></li>
                   <c:if test="${pageIfno.hasPreviousPage }">
                       <li class="paginItem"><a href="${pageContext.request.contextPath}/Mainpage?currentPage=${pageInfo.pageNum-1}"
                           > <span>«</span>
                       </a></li>
                   </c:if>
<c:forEach items="${pageInfo.navigatepageNums }" var="page_Num">
                       <c:if test="${page_Num == pageInfo.pageNum }">
                           <li class="paginItem"><a href="#">${page_Num }</a></li>
                       </c:if>
                       <c:if test="${page_Num != pageInfo.pageNum }">
                           <li class="paginItem"><a href="${pageContext.request.contextPath}/Mainpage?currentPage=${page_Num }">${page_Num }</a></li>
                       </c:if>

                   </c:forEach>
<c:if test="${pageInfo.hasNextPage }">
       <li class="paginItem"><a href="${pageContext.request.contextPath}/Mainpage?currentPage=${pageInfo.pageNum+1 }"> <span>»</span></a></li>
       </c:if>
<li class="paginItem"><a href="${pageContext.request.contextPath}/Mainpage?currentPage=${pageInfo.pages}">末页</a></li>
</ul>
</div>

10、效果图

结束语：以上代码完整的诠释了基于ssm框架，利用mybatis插件进行的分页查询功能，编辑器用着不爽，代码写的不够整洁，还望见谅，如有错误，欢迎指出；

源码下载地址:https://download.csdn.net/my/uploads

基于mybatis插件PageHelper进行的分页查询

引言：基于ssm框架下,利用Mybaits插件PageHelper进行分页查询，可以省去大量繁琐的代码，操作起来更为方便,

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