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[英]How can I store each date picked from datepicker into memory or database on Android?
[英]How to store date from datepicker into mysql database?
我試圖將日期從輸入存儲到mysql數據庫,但該值仍然為null。 反正有使其工作嗎? 它還說“已添加數據”,但未插入數據庫中,而在控制台下方則顯示NullPointerException。
JSP頁面
<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>
用於連接的Java類
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);
}
}
}
您永遠不會執行insert語句,添加一個executeUpdate
調用:
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();
並引用@SpringLearner:
記住關閉連接,結果集和准備好的語句
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