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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.
132 lines
2.3 KiB
SQL
132 lines
2.3 KiB
SQL
--
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-- PostgreSQL code for IP addresses.
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--
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load '/usr/local/pgsql/modules/ip.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 ipaddr_in(opaque)
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returns opaque
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as '/usr/local/pgsql/modules/ip.so'
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language 'c';
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create function ipaddr_out(opaque)
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returns opaque
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as '/usr/local/pgsql/modules/ip.so'
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language 'c';
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create type ipaddr (
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internallength = 8,
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externallength = variable,
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input = ipaddr_in,
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output = ipaddr_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 ipaddr_lt(ipaddr, ipaddr)
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returns bool
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as '/usr/local/pgsql/modules/ip.so'
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language 'c';
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create function ipaddr_le(ipaddr, ipaddr)
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returns bool
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as '/usr/local/pgsql/modules/ip.so'
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language 'c';
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create function ipaddr_eq(ipaddr, ipaddr)
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returns bool
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as '/usr/local/pgsql/modules/ip.so'
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language 'c';
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create function ipaddr_ge(ipaddr, ipaddr)
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returns bool
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as '/usr/local/pgsql/modules/ip.so'
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language 'c';
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create function ipaddr_gt(ipaddr, ipaddr)
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returns bool
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as '/usr/local/pgsql/modules/ip.so'
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language 'c';
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create function ipaddr_ne(ipaddr, ipaddr)
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returns bool
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as '/usr/local/pgsql/modules/ip.so'
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language 'c';
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create function ipaddr_like(ipaddr, ipaddr)
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returns bool
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as '/usr/local/pgsql/modules/ip.so'
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language 'c';
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--
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-- Now the operators. Note how some of the parameters to some
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-- of the 'create operator' commands are commented out. This
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-- is because they reference as yet undefined operators, and
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-- will be implicitly defined when those are, further down.
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--
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create operator <= (
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leftarg = ipaddr,
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rightarg = ipaddr,
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-- commutator = >,
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-- negator = >,
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procedure = ipaddr_le
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);
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create operator < (
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leftarg = ipaddr,
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rightarg = ipaddr,
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-- commutator = >=,
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-- negator = >=,
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procedure = ipaddr_lt
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);
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create operator = (
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leftarg = ipaddr,
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rightarg = ipaddr,
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commutator = =,
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-- negator = <>,
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procedure = ipaddr_eq
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);
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create operator >= (
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leftarg = ipaddr,
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rightarg = ipaddr,
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commutator = <,
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negator = <,
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procedure = ipaddr_ge
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);
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create operator > (
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leftarg = ipaddr,
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rightarg = ipaddr,
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commutator = <=,
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negator = <=,
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procedure = ipaddr_gt
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);
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create operator <> (
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leftarg = ipaddr,
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rightarg = ipaddr,
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commutator = <>,
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negator = =,
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procedure = ipaddr_ne
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);
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create operator ~~ (
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leftarg = ipaddr,
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rightarg = ipaddr,
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commutator = ~~,
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procedure = ipaddr_like
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);
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--
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-- eof
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--
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