sql 命令执行后如何触发警报？

Question

我需要在执行 sql 语句后成功添加产品后收到警报

我试过了，但是添加成功后没有提示信息

<%@include file="connection.jsp" %>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <% 
         String dbpname = request.getParameter("pname");
         String dbpid = request.getParameter("pid");
         String dbptype = request.getParameter("ptype");
         String dbaddress = request.getParameter("address");
         String dbaddress1 = request.getParameter("address1");
         String dbpquat = request.getParameter("pquat");    
         String dbpcost = request.getParameter("pcost");
         
           PreparedStatement ps=conn.prepareStatement("insert into PRODUCT  values(?,?,?,?,?,?,?,0,0)");
           
           ps.setString(1,dbpname);
           ps.setString(2,dbpid);
           ps.setString(3,dbptype);
           ps.setString(4,dbaddress);
           ps.setString(5,dbaddress1);
           ps.setString(6,dbpquat);
          
           ps.setString(7,dbpcost);
           
          int i=ps.executeUpdate();
          if(i!=0)
          {
           { %>
   <script> alert("added sucessfully");</script>; <%
        
          response.sendRedirect("AddProducts.jsp");}
                        
             %>
    </body>
</html>

Answer 1

问题是 jsp 执行 SQL 更新后，它重定向到 AddProducts.jsp。这就是警报永远不会显示在浏览器中的方式。您使用浏览器 http 跟踪来测试它。要修复它，您可以在警报显示后删除 response.sendRedirect 并执行 JavaScript 重定向（ window.location = url; ）。替换代码块：警报（"added sucessfully"）；； <%

      response.sendRedirect("AddProducts.jsp");}

         %>

与：

<script> 
  alert("added sucessfully");
      window.location = "AddProducts.jsp";  
 </script>

sql 命令执行后如何触发警报？

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