mybatis的分页插件

2023-12-13 10:17:09

?在mybatis核心配置文件中:

这时已经用了SSM整合,好多像是mapper或者数据源等都移出去了

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

    <!--分页插件-->

<plugins>
    <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
</plugins>
</configuration>

?

分页计算公式:

select * from product_info limit 起始记录=((当前页-1)*每页的条数),每页多少条

排序查询可以按照id降序排序,新插入的就排在前面

Service层

//select * from product_info limit 起始记录数=(当前页-1)*每页的条数),每页取几条
@Override
public PageInfo<ProductInfo> splitPage(int pageNum, int pageSize) {
    //分页插件使用PageHelper工具类
    PageHelper.startPage(pageNum,pageSize);
    //进行PageInfo的数据封装
    //进行有条件的查询操作,必须要创建ProductInfoExample
    ProductInfoExample productInfoExample=new ProductInfoExample();
    //设置排序,按主键降序排序
    productInfoExample.setOrderByClause("p_id desc");
    //设置排序完成后,取集合,切记:一定要在取集合之前设置PageHelp.startPage()
    List<ProductInfo> list=productInfoMapper.selectByExample(productInfoExample);
    //将查询到的集合封装到PageInfo对象中
    PageInfo<ProductInfo> pageInfo=new PageInfo<>(list);
    
    return pageInfo;
}

controller层开发

//显示第一页的五条记录
@RequestMapping("/split")
public String split(HttpServletRequest request) {
    PageInfo pageInfo =productInfoService.splitPage(1, 5);
    request.setAttribute("info",pageInfo);
    return "product";
}

它的所有数据页数,查询的结果等都存入到pageInfo中了

前端界面显示层

<div id="middle">
    <table class="table table-bordered table-striped">
        <tr>
            <th></th>
            <th>商品名</th>
            <th>商品介绍</th>
            <th>定价(元)</th>
            <th>商品图片</th>
            <th>商品数量</th>
            <th>操作</th>
        </tr>
        <c:forEach items="${info.list}" var="p">
            <tr>
                <td valign="center" align="center">
                    <input type="checkbox" name="ck" id="ck" value="${p.pId}" onclick="ckClick()"></td>
                <td>${p.pName}</td>
                <td>${p.pContent}</td>
                <td>${p.pPrice}</td>
                <td><img width="55px" height="45px"
                         src="${pageContext.request.contextPath}/image_big/${p.pImage}"></td>
                <td>${p.pNumber}</td>
                    <%--<td><a href="${pageContext.request.contextPath}/admin/product?flag=delete&pid=${p.pId}" onclick="return confirm('确定删除吗?')">删除</a>--%>
                    <%--&nbsp;&nbsp;&nbsp;<a href="${pageContext.request.contextPath}/admin/product?flag=one&pid=${p.pId}">修改</a></td>--%>
                <td>
                    <button type="button" class="btn btn-info "
                            onclick="one(${p.pId},${info.pageNum})">编辑
                    </button>
                    <button type="button" class="btn btn-warning" id="mydel"
                            onclick="del(${p.pId},${info.pageNum})">删除
                    </button>
                </td>
            </tr>
        </c:forEach>
    </table>

分页栏

<!--分页栏-->
<div id="bottom">
    <div>
        <nav aria-label="..." style="text-align:center;">
            <ul class="pagination">
                <li>
                        <%-- <a href="${pageContext.request.contextPath}/prod/split.action?page=${info.prePage}" aria-label="Previous">--%>
                    <a href="javascript:ajaxsplit(${info.prePage})" aria-label="Previous">

                        <span aria-hidden="true">?</span></a>
                </li>
                <c:forEach begin="1" end="${info.pages}" var="i">
                    <c:if test="${info.pageNum==i}">
                        <li>
                                <%--                                                <a href="${pageContext.request.contextPath}/prod/split.action?page=${i}" style="background-color: grey">${i}</a>--%>
                            <a href="javascript:ajaxsplit(${i})"
                               style="background-color: grey">${i}</a>
                        </li>
                    </c:if>
                    <c:if test="${info.pageNum!=i}">
                        <li>
                                <%--                                                <a href="${pageContext.request.contextPath}/prod/split.action?page=${i}">${i}</a>--%>
                            <a href="javascript:ajaxsplit(${i})">${i}</a>
                        </li>
                    </c:if>
                </c:forEach>
                <li>
                        <%--  <a href="${pageContext.request.contextPath}/prod/split.action?page=1" aria-label="Next">--%>
                    <a href="javascript:ajaxsplit(${info.nextPage})" aria-label="Next">
                        <span aria-hidden="true">?</span></a>
                </li>
                <li style=" margin-left:150px;color: #0e90d2;height: 35px; line-height: 35px;">总共&nbsp;&nbsp;&nbsp;<font
                        style="color:orange;">${info.pages}</font>&nbsp;&nbsp;&nbsp;页&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                    <c:if test="${info.pageNum!=0}">
                        当前&nbsp;&nbsp;&nbsp;<font
                        style="color:orange;">${info.pageNum}</font>&nbsp;&nbsp;&nbsp;页&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                    </c:if>
                    <c:if test="${info.pageNum==0}">
                        当前&nbsp;&nbsp;&nbsp;<font
                        style="color:orange;">1</font>&nbsp;&nbsp;&nbsp;页&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                    </c:if>
                </li>
            </ul>
        </nav>
    </div>
</div>

分页的ajax,因为前端默认只返回第一页结果,其他的由ajax调用返回

<!--分页的AJAX实现-->
<script type="text/javascript">
    function ajaxsplit(page) {
        //取出查询条件
        var pname = $("#pname").val();
        var typeid = $("#typeid").val();
        var lprice = $("#lprice").val();
        var hprice = $("#hprice").val();
        //向服务发出ajax请求,请示page页中的所有数据,在当前页面上局部刷新显示
        $.ajax({
            url: "${pageContext.request.contextPath}/prod/ajaxSplit.action",
            data: {"page": page,"pname":pname,"typeid":typeid,"lprice":lprice,"hprice":hprice},
            type: "post",
            success: function () {
                //重新加载显示分页数据的容器
                
                $("#table").load("http://localhost:8080/admin/product.jsp #table");
            }
        });

    }

$("#table").load("http://localhost:8080/admin/product.jsp #table");重新容器加载在session中取出数据

文章来源:https://blog.csdn.net/m0_62645012/article/details/134838260
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