[DERBY-4611] Add new datatypes: TIME WITH TIMEZONE and TIMESTAMP WITH TIMEZONE

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: SQL
• Labels: derby_triage10_10
• Urgency: Normal
• Assignee: Unassigned
• Reporter: Richard N. Hillegas
• Created: 10/Apr/10 15:24
• Updated: 20/Sep/14 14:56

Description

The SQL Standard defines two timezone-stamped datatypes: TIME WITH TIMEZONE and TIMESTAMP WITH TIMEZONE. Relevant sections in part 2 of the Standard include 4.6 (Datetimes and intervals), 6.1 (<data type>), 6.12 (<cast specification>), and 8.2 (<comparison predicate>).

I think that we could implement these two datatypes today. Note that there is a general cleanup of the Java datetime classes underway in JSR 310 ( https://jsr-310.dev.java net/ ), which is supposed to be delivered in Java 7. It's possible that the next rev of JDBC will provide better support for these datatypes. However, there is currently no JSR covering the next JDBC increment.

For the moment, the existing JDBC TIME and TIMESTAMP types would have to be overloaded to cover the new datatypes. Disambiguating the WITH TIMEZONE variants might have to be accomplished by parsing the type names returned by ResultSetMetaData.getColumnTypeName() and DatabaseMetaData.getColumns().TYPE_NAME.

Note also that DRDA does not provide WITH TIMEZONE variants of its TIME and TIMEZONE types. Some creativity would be required here too.

Users are welcome to vote for this issue in order to boost its chance of being addressed.

Issue Links

• blocks: DERBY-5974 Convert TIMESTAMP metadata columns to TIMESTAMP WITH TIMEZONE after we implement that datatype.
• relates to: DERBY-2235 Server doesnt support timestamps with timezone