如何将日期选择器中的日期存储到mysql数据库中？

Question

I have tried storing date from input to mysql database, but the value is still null. 我试图将日期从输入存储到mysql数据库，但该值仍然为null。 Is there anyway to make it work? 反正有使其工作吗？ Also it says 'data added' but it is not inserted in database and below it in console it gives NullPointerException. 它还说“已添加数据”，但未插入数据库中，而在控制台下方则显示NullPointerException。

JSP page JSP页面

<html>
    <link rel="stylesheet" href="http://code.jquery.com/ui/1.10.2/themes/smoothness/jquery-ui.css" />
    <script src="http://code.jquery.com/jquery-1.9.1.js"></script>
    <script src="http://code.jquery.com/ui/1.10.2/jquery-ui.js"></script>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Date Input</title>
<script>
    $(function(){
        $('.datepicker').datepicker();
    });
</script>
</head>
<body>
    <form action="Date" method="post">
        <div class="row">
        Date: <input class="datepicker" type="text" name="date" id="date">
        </div>
        <input type="submit" value="save">
    </form>
</body>
</html>

Java class for connection 用于连接的Java类

package com.jsppractise;
public class Date extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            response.setContentType("text/html");
            PrintWriter out = response.getWriter();
            String dt = request.getParameter("date").toString();

            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sportsevent", "root", "root");

            PreparedStatement ps = con.prepareStatement("insert into date (date) values(?)");
            java.util.Date date = new SimpleDateFormat("MM/dd/yyyy").parse(dt);
            java.sql.Date d = new java.sql.Date(date.getTime());
            ps.setDate(1, d);
            ps = con.prepareStatement("select * from date");
            ResultSet s;
            s = ps.executeQuery();
            if (s != null) {
                System.out.println("date added");
            } else {
                System.out.println("not added");
            }

            out.print("<html><body><table><th>Date</th>");
            out.print("<tr><td>" + s.getDate(1) + "</td></tr>");
            out.print("</table></body></html>");
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

Answer 1

You are never executing the insert statement, add an executeUpdate call : 您永远不会执行insert语句，添加一个executeUpdate调用：

    PreparedStatement ps = con.prepareStatement("insert into date (date) values(?)");
    java.util.Date date = new SimpleDateFormat("MM/dd/yyyy").parse(dt);
    java.sql.Date d = new java.sql.Date(date.getTime());
    ps.setDate(1, d);
    ps.executeUpdate();// ADDED

    ps = con.prepareStatement("select * from date");
    ResultSet s = ps.executeQuery();

And to quote @SpringLearner : 并引用@SpringLearner：

Remember to close connection,resultset and preparedstatement 记住关闭连接，结果集和准备好的语句

如何将日期选择器中的日期存储到mysql数据库中？

问题描述

1 个解决方案

解决方案1
2 2017-03-17 10:13:45

如何将日期选择器中的日期存储到mysql数据库中？

问题描述

1 个解决方案

解决方案1 2 2017-03-17 10:13:45

解决方案1
2 2017-03-17 10:13:45