How can I insert a "null" timestamp with Spring JDBC Framework into a DB2 database - spring

Question

I created a Java web application, in which I use the Spring JDBC Framework, in order to write my queries for the DB2 database. So far all the queries are working excellent.
I tried today to create an INSERT query for a table I have in my database. The query is really straight forword, it works as DB2 query and it looks like this:
INSERT INTO MYDB.USERSUBSCRIPTION (USERNAME, SUBSCRIPTIONDATETIME, UNSUBSCRIPTIONDATETIME)
VALUES('JamesTheBoss', '2017-07-07 07:07:07.007', null);
In my Java class I created the following methods:
private Timestamp getCurrentDateTimeInTimeStamp() {
LocalDateTime currentDateAndTime = LocalDateTime.now();
currentDateAndTime.format(DateTimeFormatter.ofPattern("yyy-MM-dd HH:MM:SS.mm")).replaceAll("T", " ");
Timestamp timestamp = Timestamp.valueOf(currentDateAndTime);
return timestamp;
}
public void insertNewUserToDatabase(String username){
Timestamp timestamp = getCurrentDateTimeInTimeStamp();
String SQL = "INSERT INTO MYDB.USERSUBSCRIPTION (USERNAME, SUBSCRIPTIONDATETIME, UNSUBSCRIPTIONDATETIME) " +
"VALUES(?, ?, ?)";
this.jdbcTemplateObject = new JdbcTemplate(dataSource);
jdbcTemplateObject.update(SQL,new Object[] { username, timestamp, null});
}
My first query was the following:
public List<UserSubscription> getAllUserSubscriptions() throws SQLException {
String SQL = "SELECT * FROM MYDB.USERSUBSCRIPTION";
this.jdbcTemplateObject = new JdbcTemplate(dataSource);
List<UserSubscription> userSubscription = jdbcTemplateObject.query(SQL, new UserSubscriptionMapper());
return userSubscription;
}
and it works fine, as all other queries I wrote also do.
When I try to insert "null" as a Timestamp Parameter in the query, I become an exception.
How can I insert a "null" value for a Timestamp by using the Spring JDBC Framework?
I would really appreciate having a feedback.

Answer 1

I have been debbuging for a while and I found out that I can hardcode a null in my query and then the query works fine.
With a hardcoded "null" the query looks like this:
public void insertNewUserToDatabase(String username){
Timestamp timestamp = getCurrentDateTimeInTimeStamp();
String SQL = "INSERT INTO MYDB.USERSUBSCRIPTION (USERNAME, SUBSCRIPTIONDATETIME, UNSUBSCRIPTIONDATETIME) " +
"VALUES(?, ?, null)"; // <--- Hard Coded "null"
this.jdbcTemplateObject = new JdbcTemplate(dataSource);
jdbcTemplateObject.update(SQL,new Object[] { username, timestamp});
}
When this query is executed, I become a new record in DB2 Database with a "null" value for column "UNSUBSCRIPTIONDATETIME".