8.7 UUID Functions

8.7.1 CHAR_TO_UUID()

Available inDSQL, PSQL

Added in2.5

Syntax 

CHAR_TO_UUID (ascii_uuid)

Table 8.7.1.1 CHAR_TO_UUID Function Parameter
ParameterDescription

ascii_uuid

A 36-character representation of UUID. - (hyphen) in positions 9, 14, 19 and 24; valid hexadecimal digits in any other positions, e.g. 'A0bF4E45-3029-2a44-D493-4998c9b439A3'

Result typeCHAR(16) CHARACTER SET OCTETS

DescriptionConverts a human-readable 36-char UUID string to the corresponding 16-byte UUID.

Examples 

select char_to_uuid('A0bF4E45-3029-2a44-D493-4998c9b439A3') from rdb$database
-- returns A0BF4E4530292A44D4934998C9B439A3 (16-byte string)
 
select char_to_uuid('A0bF4E45-3029-2A44-X493-4998c9b439A3') from rdb$database
-- error: -Human readable UUID argument for CHAR_TO_UUID must
--         have hex digit at position 20 instead of "X (ASCII 88)"

See alsoSection 8.7.3, UUID_TO_CHAR(), Section 8.7.2, GEN_UUID()

8.7.2 GEN_UUID()

Available inDSQL, PSQL

Syntax 

GEN_UUID ()

Result typeCHAR(16) CHARACTER SET OCTETS

DescriptionReturns a universally unique ID as a 16-byte character string.

Example 

select gen_uuid() from rdb$database
-- returns e.g. 017347BFE212B2479C00FA4323B36320 (16-byte string)

See alsoSection 8.7.3, UUID_TO_CHAR(), Section 8.7.1, CHAR_TO_UUID()

8.7.3 UUID_TO_CHAR()

Available inDSQL, PSQL

Added in2.5

Syntax 

UUID_TO_CHAR (uuid)

Table 8.7.3.1 UUID_TO_CHAR Function Parameters
ParameterDescription

uuid

16-byte UUID

Result typeCHAR(36)

DescriptionConverts a 16-byte UUID to its 36-character, human-readable ASCII representation.

Examples 

select uuid_to_char(x'876C45F4569B320DBCB4735AC3509E5F') from rdb$database
-- returns '876C45F4-569B-320D-BCB4-735AC3509E5F'
 
select uuid_to_char(gen_uuid()) from rdb$database
-- returns e.g. '680D946B-45FF-DB4E-B103-BB5711529B86'
 
select uuid_to_char('Firebird swings!') from rdb$database
-- returns '46697265-6269-7264-2073-77696E677321'

See alsoSection 8.7.1, CHAR_TO_UUID(), Section 8.7.2, GEN_UUID()