Firebird 2.1 Language Reference Update

Context variables
else
delete from Customers where custno = :custno;
CURRENT_ROLE always represents a valid role or NONE. If a user connects with a non-existing role, the engine
silently resets it to NONE without returning an error.
Available in: DSQL, PSQL, ESQL
Changed in: 2.0
CURRENT_TIME
Description: CURRENT_TIME returns the current server time. In versions prior to 2.0, the fractional part used to
be always “.0000”, giving an effective precision of 0 decimals. From Firebird 2.0 onward you can specify a
precision when polling this variable. The default is still 0 decimals, i.e. seconds precision.
Type: TIME
Syntax:
Examples:
Notes:
CURRENT_TIME [(precision)]
precision ::= 0 | 1 | 2 | 3
The optional precision argument is not supported in ESQL.
select current_time from rdb$database
-- returns e.g. 14:20:19.6170
select current_time(2) from rdb$database
-- returns e.g. 14:20:23.1200
• Unlike CURRENT_TIME, the default precision of CURRENT_TIMESTAMP has changed to 3 decimals. As a
result, CURRENT_TIMESTAMP is no longer the exact sum of CURRENT_DATE and CURRENT_TIME, unless
you explicitly specify a precision.
• Within a PSQL module (procedure, trigger or executable block), the value of CURRENT_TIME will remain
constant every time it is read. If multiple modules call or trigger each other, the value will remain constant
throughout the duration of the outermost module. If you need a progressing value in PSQL (e.g. to measure
time intervals), use 'NOW'.
Available in: DSQL, PSQL, ESQL
CURRENT_TIMESTAMP
110