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674b22a2a4
PostgreSQL type extensions for IP and MAC addresses. I needed to record IP and MAC level ethernet addresses in a data base, and I really didn't want to store them as plain strings, with no enforced error checking, so I put together the accompanying code as my first experiment with adding a data type to PostgreSQL. I then thought that this might be useful to others, both directly and as a very simple example of how to do this sort of thing, so here it is, in the hope that it will be useful.
89 lines
1.6 KiB
SQL
89 lines
1.6 KiB
SQL
--
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-- PostgreSQL code for MAC addresses.
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--
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load '/usr/local/pgsql/modules/mac.so';
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--
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-- Input and output functions and the type itself:
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--
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create function macaddr_in(opaque)
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returns opaque
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as '/usr/local/pgsql/modules/mac.so'
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language 'c';
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create function macaddr_out(opaque)
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returns opaque
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as '/usr/local/pgsql/modules/mac.so'
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language 'c';
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create type macaddr (
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internallength = 8,
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externallength = variable,
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input = macaddr_in,
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output = macaddr_out
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);
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--
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-- The various boolean tests:
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--
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create function macaddr_eq(macaddr, macaddr)
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returns bool
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as '/usr/local/pgsql/modules/mac.so'
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language 'c';
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create function macaddr_ne(macaddr, macaddr)
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returns bool
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as '/usr/local/pgsql/modules/mac.so'
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language 'c';
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create function macaddr_like(macaddr, macaddr)
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returns bool
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as '/usr/local/pgsql/modules/mac.so'
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language 'c';
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--
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-- Now the operators. Note how the "negator = <>" in the
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-- definition of the equivalence operator is commented out.
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-- It gets defined implicitly when "<>" is defined, with
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-- "=" as its negator.
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--
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create operator = (
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leftarg = macaddr,
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rightarg = macaddr,
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commutator = =,
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-- negator = <>,
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procedure = macaddr_eq
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);
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create operator <> (
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leftarg = macaddr,
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rightarg = macaddr,
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commutator = <>,
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negator = =,
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procedure = macaddr_ne
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);
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create operator ~~ (
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leftarg = macaddr,
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rightarg = macaddr,
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commutator = ~~,
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procedure = macaddr_like
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);
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--
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-- Finally, the special manufacurer matching function:
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--
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create function macaddr_manuf(macaddr)
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returns text
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as '/usr/local/pgsql/modules/mac.so'
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language 'c';
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--
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-- eof
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--
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