Question

我正在尝试编辑和删除多条记录中的单条记录。以下是我在jsp页面上显示的示例记录，

enter image description here

我可以使用下面的代码

轻松编辑每一行的记录

  <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
         <%@ page import="java.util.List" %>
          <%@ page import="java.util.Iterator" %>

     <%@page import="java.sql.ResultSet"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    <script src="jquery1.11.0.min.js"></script>

    </head>
    <body>

        <script type="text/javascript">


                function editRecording(task_id) {
                    //alert(task_id)

                            url = "EditRecord";
                            window.location="/RTTSchecking/"+url+"?task_id="+task_id;

                    }


        </script>

  <table align="center" border="1px" width="80%"  >
    <thead>
        <tr>
        <th>User_Id</th>
        <th>Class</th>
        <th>Subject</th>
        <th>Chapter</th>
        <th>Planned_Features</th>
        <th>Planned_Date</th>

    </thead>


            <%Iterator itr;%>       
            <%List data = (List) request.getAttribute("TaskData");

            for(itr = data.iterator(); itr.hasNext();)
            {
                %>
                <tr>
                <% String s = (String) itr.next(); 
                %>
                <td style="background-color: yellow;">
                <input type="text" name="tid" value="<%=s %>"></td>
                <td><input type="text" name="tid" value="<%=itr.next() %>"></td>

                <td><%=itr.next() %></td>
                <td><%=itr.next() %></td>
                <td><%=itr.next() %></td>
                <td><%=itr.next() %></td>


                <td><input type="button"  value="edit" name="<%=s%>" onclick="editRecording(this.name);"></td> 
             <td><input type="button"  value="delete" name="<%=s%>" onclick="deleteRecording(this.name);"></td> 



                <% } %>



                </tr>

                </table>


    </body>
    </html>

EditREcord（servlet的）：

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        PrintWriter out = response.getWriter();

        try {

            String a=request.getParameter("task_id");

        convty = new Connectivity();
        con = convty.setConnection();
        st = con.createStatement();
        query = "select * from task_table where task_id='"+a+"'";
        rset = convty.getResultSet(query, con);


        }
        catch(Exception e) {

        }
        finally {
            request.setAttribute("EditData", rset);
            RequestDispatcher dd= request.getRequestDispatcher("editdata.jsp");
            dd.forward(request, response);
            out.close();
            //out.println(""+tid);
        }

    }

上面的代码工作正常。但我的问题是，我想删除基于User_id，Class，Subject，Chapter和Planned_Date的记录，那么如何从单行（想要删除行）中获取这些值？

如何获得以下代码？，

  <script type="text/javascript">


                        function deleteRecording(User_id,Class,Subject,Chapter,Date) {
                            //alert(task_id,Class,Subject,Chapter,Date)

                                    url = "EditRecord";
                                    window.location="/RTTSchecking/"+url+"?user_id="+User_id+"&Tclass="+Class+"&subject="+Subject+"&chapter="+Chapter+"&date="+Date;

                </script>

如果我实现了上面的代码，那么我可以使用下面的代码轻松删除多行中选定的单个记录，

try {

                String uid=request.getParameter("user_id");
String class=request.getParameter("Tclass");
String sub=request.getParameter("subject");
String chap=request.getParameter("chapter");
String date=request.getParameter("date");

            convty = new Connectivity();
            con = convty.setConnection();
            st = con.createStatement();
            query = "delete from task_table where User_id='"+uid+"' and class='"+class+"' and subject='"+sub+"' and chapter='"+chap+"' and date='"+date+"'";
           st.executeUpdate(query);


            }
            catch(Exception e) {

            }

注意：我可以使用从task_table删除来删除记录，其中User_id =＆＃39;＆＃34; + uid +＆＃34;＆＃39;;

但如何处理 query =＆＃34;从task_table中删除User_id =＆＃39;＆＃34; + uid +＆＃34;＆＃39;和班级=＆＃39;＆＃34; +班级+＆＃34;＆＃39;和subject =＆＃39;＆＃34; + sub +＆＃34;＆＃39;和章=＆＃39;＆＃34; + chap +＆＃34;＆＃39;和日期=＆＃39;＆＃34; +日期+＆＃34;＆＃39;＆＃34;;

我希望有人能帮助我。

Answer 1

从数据库中删除数据意味着将其删除。

您只需点击删除即可重新加载该页面。

Answer 2

我希望你现在已经找到了问题的解决方案。但是如果你没有，我今天遇到了同样的问题，经过多次实验，我想出了以下语法，用于删除多个标准的行：

  " DELETE FROM table_name WHERE " +
  " first_db_field_name = '" + matching_variable_name + "'" +
  " and next_db_field_name = '" + next_matching_variable_name + "'" +
  " and last_db_field_name = '" + last_matching_variable_name + "'";

如何从jsp页面中的gridview等多行记录中删除单个记录

2 个答案: