java - 数据截断 : Incorrect datetime value: ''

Question

任何人都可以帮助我提供示例 JSP 代码以通过 JDBC 将日期存储在 MySql 数据库中吗？当我尝试执行下面给出的代码时，出现以下异常:

com.mysql.jdbc.MysqlDataTruncation: Data truncation: Incorrect datetime value: '' for column 'date' at row 1

如何克服这个问题？以下是我的代码:

Connection con = null;

String StaffName = request.getParameter("StaffName");
// String subcode = request.getParameter("subcode");
String hourId = request.getParameter("hourId");
if (hourId == null)
    hourId = "";
String day = request.getParameter("day");
if (day == null)
    day = "";
String date = request.getParameter("date");
try {
    Class.forName("com.mysql.jdbc.Driver");
    con = DriverManager.getConnection("jdbc:mysql://localhost:3306/StaffAllocation", "root", "success");

    // PreparedStatement stat = con.PrepareStatement();
    String updateString = "INSERT INTO tblstaffallocation (StaffName,hourId,daysId,date) VALUES (?,?,?,?)";
    PreparedStatement preparedStatement = con.prepareStatement(updateString);

    preparedStatement.setString(1, StaffName);
    preparedStatement.setInt(2, 0);
    preparedStatement.setInt(3, 0);
    preparedStatement.setString(4, date);
} catch (Exception e) {
    out.print(e);
}

Answer 1

要将日期设置为准备好的语句，您需要更改值的类型:

String date = request.getParameter("date");
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); // your template here
java.util.Date dateStr = formatter.parse(date);
java.sql.Date dateDB = new java.sql.Date(dateStr.getTime());

现在将 String date 转换为 java.sql.Date 并使用另一种方法:

preparedStatement.setDate(4,dateDB);