MyBatis快速入门——第六章、MyBatis分页demo测试-阿里云开发者社区

MyBatis快速入门——第六章、MyBatis分页demo测试

2022-11-08 95

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简介： MyBatis快速入门——第六章、MyBatis分页demo测试

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1、映射mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC ".//mybaits.org/DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.item.mapper.ProductMapper">
    <select id="GetInfo" resultType="Product">
        select * from product limit #{pageNow},#{pageSize}
    </select>
    <delete id="DeleteById" parameterType="java.lang.Integer">
        delete from product where id="${id}"
    </delete>
</mapper>

2、映射接口ProductMapper

package com.item.mapper;
import com.item.model.Product;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface ProductMapper {
    /**
     * 查询所有的接口
     * @return
     */
    List<Product> GetInfo(@Param("pageNow") int pageNow,@Param("pageSize")int pageSize);
    /**
     * 删除
     * @param id
     * @return
     */
    int DeleteById(@Param("id") String id);
}

3、ProductDAO.java数据层

package com.item.dao;
import com.item.common.JDBC;
import com.item.mapper.ProductMapper;
import com.item.model.Product;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import java.util.List;
public class ProductDAO {
    /**
     * 获取所有查询信息
     * @return
     */
    public static List<Product> GetInfo(int pageNow,int pageSize){
        SqlSessionFactory factory = JDBC.GetConn();
        SqlSession session = factory.openSession();
        ProductMapper db = session.getMapper(ProductMapper.class);
        List<Product> list = db.GetInfo(pageNow,pageSize);
        session.close();
        return list;
    }
    /**
     * 删除
     * @param id
     * @return
     */
    public static boolean DeleteById(String id){
        SqlSessionFactory factory = JDBC.GetConn();
        SqlSession session = factory.openSession();
        ProductMapper db = session.getMapper(ProductMapper.class);
        int rows = db.DeleteById(id);
        session.commit();
        session.close();
        return rows>0;
    }
}

4、GetInfoServlet.java的servlet文件

package com.item.servlet;
import com.item.dao.ProductDAO;
import com.item.model.Product;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
@WebServlet("/GetInfo")
public class GetInfoServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String pageNow = request.getParameter("pageNow");
        String pageSize = request.getParameter("pageSize");
        int int_pageNow = Integer.parseInt(pageNow.isEmpty() ? "0" : pageNow);
        int int_pageSize = Integer.parseInt(pageSize.isEmpty() ? "3" : pageSize);
        System.out.println(int_pageNow+"~"+int_pageSize);
        int_pageNow=(int_pageNow-1)*int_pageSize;
        System.out.println(int_pageNow);
        List<Product> list = ProductDAO.GetInfo(int_pageNow,int_pageSize);
        //发送至前台
        request.setAttribute("lists",list);
        request.getRequestDispatcher("GetInfo.jsp").forward(request,response);
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }
}

5、JSP页面

<%@ page import="java.util.List" %>
<%@ page import="com.item.model.Product" %><%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2022/5/16 0016
  Time: 15:55
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>bootStrap——table</title>
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<% List<Product> list = (List<Product>) request.getAttribute("lists"); %>
<div style="width: 90%;text-align: center;padding:50px;font-size: 3rem">
    [<a href="/GetInfo?pageNow=1&pageSize=5">1,5</a>]
    [<a href="/GetInfo?pageNow=1&pageSize=3">1,3</a>]
    [<a href="/GetInfo?pageNow=1&pageSize=5">1,5</a>]
    [<a href="/GetInfo?pageNow=2&pageSize=5">2,5</a>]
    [<a href="/GetInfo?pageNow=2&pageSize=3">2,3</a>]
    [<a href="/GetInfo?pageNow=3&pageSize=2">3,2</a>]
</div>
<table class="table table-bordered table-hover">
    <tr class="info">
        <th>编号</th>        <th>创建时间</th>        <th>修改时间</th>        <th>产品名称</th>
        <th>产品标题</th>        <th>产品价格</th>        <th>产品数量</th>        <th>产品厂家</th>
        <th>产品颜色</th>        <th>产品重量</th>        <th>产品状态</th>        <th>操作</th>
    </tr>
    <% for (Product p : list) {
    %>
        <tr>
            <td><%=p.getId()%></td>
            <td><%=p.getCreateDate()%></td>
            <td><%=p.getModifyDate()%></td>
            <td><%=p.getProductName()%></td>
            <td><%=p.getProductTitle()%></td>
            <td><%=p.getProductPrice()%></td>
            <td><%=p.getProductCount()%></td>
            <td><%=p.getProductType()%></td>
            <td><%=p.getProductColor()%></td>
            <td><%=p.getProductWeight()%></td>
            <td><%=p.getProductStatus()%></td>
            <td>
                <a href="/DeleteById?id=<%=p.getId()%>" onclick="return confirm('是否删除此行？')" class="btn btn-primary">删除</a>
            </td>
        </tr>
    <%
    } %>
</table>
<hr/>
</body>
</html>

6、访问路径

http://localhost:8088/GetInfo?pageNow=1&pageSize=5

7、访问效果

删除一个信息