如何在Java中将Calendar转换为java.sql.Date？

Question

Calendar cal;
String sql = "INSERT INTO ttable (dt) values (?);"
//dt is a dateTime field in ttable

PreparedStatement stmt = connection.prepareStatement(sql);

stmt = setDate(1,cal); //not working

stmt.execute();
stmt.close();

我想将cal转换为Date类型以插入表中.

Answer 1

有一种getTime()方法(不确定为什么它不被称为getDate).

编辑:刚刚意识到你需要一个java.sql.Date.使用的答案之一cal.getTimeInMillis()就是您需要的.

Answer 2

你试过cal.getTime()吗？这将获得日期表示.

您可能还想查看javadoc.

Answer 3

使用 stmt.setDate(1, new java.sql.Date(cal.getTimeInMillis()))

Answer 4

转换很容易,设置日期和时间有点棘手.这是一个例子:

Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, 2000);
cal.set(Calendar.MONTH, 0);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.set(Calendar.HOUR_OF_DAY, 1);
cal.set(Calendar.MINUTE, 1);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
stmt.setDate(1, new java.sql.Date(cal.getTimeInMillis()));

Answer 5

这是将Calendar值转换为Date实例的简单方法.

Calendar C = new GregorianCalendar(1993,9,21);

Date DD = C.getTime();

System.out.println(DD);