weiyong
/
2001010304G01


			
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							<%@ page import="com.xbw.repository.StudentRepository" %>
<%@ page import="com.xbw.entity.Student" %>
<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %><%--
  Created by IntelliJ IDEA.
  User: x'b'w
  Date: 2021/5/23
  Time: 11:28
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>主页面</title>
</head>
<body>
<%--    查询OK--%>
    <form action="student1" method="get">
        查询学号为<input type="text" name="selectnum">的同学的名字：<input type="text" name="selectname" readonly value="暂不开放！">
        <input type="submit" value="查询"><br>
        <input type="hidden" name="method" value="select" />
    </form>
<%--    修改OK--%>
    <form action="student1" method="post">
        修改学号为<input type="text" name="updatenum">的同学的名字为：<input type="text" name="updatename"><input type="submit" value="修改"><br>
        <input type="hidden" name="method" value="update"/>
    </form>
<%--    增加OK--%>
    <form action="student1" method="post">
        增加学号为<input type="text" name="addnum">的同学的名字为：<input type="text" name="addname"><input type="submit" value="增加"><br>
        <input type="hidden" name="method" value="add"/>
    </form>
<%--    删除OK--%>
    <form action="student1" method="get">
        删除学号为<input type="text" name="deletenum">的同学的名字为：<input type="text" name="deletename"  readonly value="暂不开放！">
        <input type="submit" value="删除"><br>
        <input type="hidden" name="method" value="delete"/>
    </form>

<%--    查询所有-------------------------------------------------------------------------------------------------------%>
    <form action="student1" method="get">
        <input type="submit" value="查询所有">
    </form>

<%--    查询所有信息：${list}--%>


    <table>
<%--        <tr>--%>
<%--            <th>编号</th>--%>
<%--            <th>姓名</th>--%>
<%--        </tr>--%>

<%--        <tr>--%>
<%--            <td>编号</td>--%>
<%--            <td>姓名</td>--%>
<%--        </tr>--%>
        <br>
<%--        查询一条信息：${resnum}--%>
        <br>
    <table>
        <c:choose>
            <c:when test="${resnum != null}">
                查询一条信息:
                ${resnum}
                <tr>
                    <td>${resnum.num}</td>
                    <td>${resnum.name}</td>
                </tr>
            </c:when>
            <c:otherwise>
                查无一条信息：null.
            </c:otherwise>

        </c:choose>
    </table>

        <br>

    <table>
        <c:choose>
            <c:when test="${list != null}">
                全部信息：
                ${list}
                <c:forEach items="${list}" var="student1">
                    <tr>
                        <td>${student1.num}</td>
                        <td>${student1.name}</td>
                    </tr>
                </c:forEach>
            </c:when>
            <c:otherwise>
                查无全部信息：null.
            </c:otherwise>
        </c:choose>
    </table>


<%--        <%--%>
<%--            String sel =(String) request.getAttribute("resnum");--%>
<%--            if (sel != null){--%>

<%--        %>--%>
<%--        <%=--%>
<%--            "当前查询的语句为"+sel--%>
<%--        %>--%>
<%--        <%--%>
<%--            }else {--%>
<%--        %>--%>
<%--        <%=--%>
<%--            "当前查询不到语句：null"--%>
<%--        %>--%>


    </table>


</body>
</html>