如何将java.util.Date转换为时间戳中的当前时间..？

Question

i am making a program in java. i am using the following code

u.setLastlogin(new java.util.Date());

above function accepts parameter as java.util.Date but i want to store this value in a database table where the column is of type timestamp ?

can any one help how to code so that i can insert the current timestamp of the system in the table. thanks.

Answer 1

You can convert Date to Timestamp as follows:

Timestamp timestamp = new Timestamp(date.getTime());

And if you want timestamp of current date:

new Timestamp(System.currentTimeMillis())

Answer 2

Date now = new Date();
now.getTime();

Answer 3

You could also just issue an SQL statement:

UPDATE MY_TABLE SET LAST_LOGIN = NOW();

This is for MySQL. You should also find this helpful: MySQL Date and Time functions

EDIT As Rambo requested, setting default value of a column to the actual timestamp (As per MySQL: ALTER TABLE syntax and MySQL Data type default values ):

ALTER TABLE MY_TABLE ALTER MY_TIMESTAMP COLUMN SET DEFAULT CURRENT_TIMESTAMP;

Answer 4

With JPA:

annotate lastLogin with: @Temporal(TemporalType.TIMESTAMP)

With JDBC:

PreparedStatement#setTimestamp

Answer 5

将此用于java.sql.Timestamp timestamp = new java.sql.Timestamp(new Date().getTime());

u.setLastlogin(timestamp);