Java中的日期时间和休眠中的默认日期时间映射

Question

I need some little help about a confusion i'm having. since i came from C# .NET i was expeting java to have something similar to C# DateTime. While i manage to create a helper method to convert string representation of date like eg "2009-10-16 11:14:34" to date object. here is the method

  public static Date convertToDateTime(String stringDate) { 
    DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    Date date;
    try {
        date = df.parse(stringDate);
    } catch(ParseException e){
        e.printStackTrace();
    }
    return date;
 }

now i just want to persist now (i mean now date, like actual date) like New Date() and have that date in the database have the same representation yyyy-MM-dd HH:mm:s. Unless i'm not getting something fundamental

Since i'm using hibernate is it due to the mapping file? if so i have 2 question 1 How to then map my property so that New Date will be persited in this format yyyy-MM-dd HH:mm:s 2 How to have a default datetime mapping so if the property is null it still will be persited in the yyyy-MM-dd HH:mm:s format Thanks for reading

Answer 1

You don't want your dates being stored in any format, you want them to be stored as a date.

This mapping definition could work (not sure about the default=now() part):

<property name="foo" not-null="false">
    <column name="foo" default="now()" not-null="true" sql-type="datetime" />
</property>