76 lines
3.1 KiB
MySQL
76 lines
3.1 KiB
MySQL
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CREATE EXTENSION "uuid-ossp";
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SELECT uuid_nil();
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SELECT uuid_ns_dns();
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SELECT uuid_ns_url();
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SELECT uuid_ns_oid();
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SELECT uuid_ns_x500();
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-- some quick and dirty field extraction functions
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-- this is actually timestamp concatenated with clock sequence, per RFC 4122
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CREATE FUNCTION uuid_timestamp_bits(uuid) RETURNS varbit AS
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$$ SELECT ('x' || substr($1::text, 15, 4) || substr($1::text, 10, 4) ||
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substr($1::text, 1, 8) || substr($1::text, 20, 4))::bit(80)
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& x'0FFFFFFFFFFFFFFF3FFF' $$
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LANGUAGE SQL STRICT IMMUTABLE;
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CREATE FUNCTION uuid_version_bits(uuid) RETURNS varbit AS
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$$ SELECT ('x' || substr($1::text, 15, 2))::bit(8) & '11110000' $$
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LANGUAGE SQL STRICT IMMUTABLE;
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CREATE FUNCTION uuid_reserved_bits(uuid) RETURNS varbit AS
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$$ SELECT ('x' || substr($1::text, 20, 2))::bit(8) & '11000000' $$
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LANGUAGE SQL STRICT IMMUTABLE;
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CREATE FUNCTION uuid_multicast_bit(uuid) RETURNS bool AS
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$$ SELECT (('x' || substr($1::text, 25, 2))::bit(8) & '00000001') != '00000000' $$
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LANGUAGE SQL STRICT IMMUTABLE;
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CREATE FUNCTION uuid_local_admin_bit(uuid) RETURNS bool AS
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$$ SELECT (('x' || substr($1::text, 25, 2))::bit(8) & '00000010') != '00000000' $$
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LANGUAGE SQL STRICT IMMUTABLE;
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CREATE FUNCTION uuid_node(uuid) RETURNS text AS
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$$ SELECT substr($1::text, 25) $$
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LANGUAGE SQL STRICT IMMUTABLE;
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-- Ideally, the multicast bit would never be set in V1 output, but the
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-- UUID library may fall back to MC if it can't get the system MAC address.
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-- Also, the local-admin bit might be set (if so, we're probably inside a VM).
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-- So we can't test either bit here.
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SELECT uuid_version_bits(uuid_generate_v1()),
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uuid_reserved_bits(uuid_generate_v1());
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-- Although RFC 4122 only requires the multicast bit to be set in V1MC style
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-- UUIDs, our implementation always sets the local-admin bit as well.
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SELECT uuid_version_bits(uuid_generate_v1mc()),
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uuid_reserved_bits(uuid_generate_v1mc()),
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uuid_multicast_bit(uuid_generate_v1mc()),
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uuid_local_admin_bit(uuid_generate_v1mc());
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-- timestamp+clock sequence should be monotonic increasing in v1
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SELECT uuid_timestamp_bits(uuid_generate_v1()) < uuid_timestamp_bits(uuid_generate_v1());
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SELECT uuid_timestamp_bits(uuid_generate_v1mc()) < uuid_timestamp_bits(uuid_generate_v1mc());
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-- Ideally, the node value is stable in V1 addresses, but OSSP UUID
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-- falls back to V1MC behavior if it can't get the system MAC address.
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SELECT CASE WHEN uuid_multicast_bit(uuid_generate_v1()) AND
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uuid_local_admin_bit(uuid_generate_v1()) THEN
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true -- punt, no test
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ELSE
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uuid_node(uuid_generate_v1()) = uuid_node(uuid_generate_v1())
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END;
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-- In any case, V1MC node addresses should be random.
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SELECT uuid_node(uuid_generate_v1()) <> uuid_node(uuid_generate_v1mc());
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SELECT uuid_node(uuid_generate_v1mc()) <> uuid_node(uuid_generate_v1mc());
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SELECT uuid_generate_v3(uuid_ns_dns(), 'www.widgets.com');
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SELECT uuid_generate_v5(uuid_ns_dns(), 'www.widgets.com');
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SELECT uuid_version_bits(uuid_generate_v4()),
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uuid_reserved_bits(uuid_generate_v4());
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SELECT uuid_generate_v4() <> uuid_generate_v4();
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