117 lines
2.0 KiB
SQL
117 lines
2.0 KiB
SQL
--
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-- PostgreSQL code for ISBNs.
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--
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-- $Id: isbn.sql,v 1.1 1998/08/17 03:35:05 scrappy Exp $
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--
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load '/usr/local/pgsql/modules/isbn.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 isbn_in(opaque)
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returns opaque
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as '/usr/local/pgsql/modules/isbn.so'
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language 'c';
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create function isbn_out(opaque)
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returns opaque
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as '/usr/local/pgsql/modules/isbn.so'
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language 'c';
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create type isbn (
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internallength = 16,
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externallength = 13,
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input = isbn_in,
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output = isbn_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 isbn_lt(isbn, isbn)
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returns bool
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as '/usr/local/pgsql/modules/isbn.so'
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language 'c';
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create function isbn_le(isbn, isbn)
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returns bool
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as '/usr/local/pgsql/modules/isbn.so'
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language 'c';
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create function isbn_eq(isbn, isbn)
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returns bool
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as '/usr/local/pgsql/modules/isbn.so'
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language 'c';
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create function isbn_ge(isbn, isbn)
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returns bool
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as '/usr/local/pgsql/modules/isbn.so'
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language 'c';
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create function isbn_gt(isbn, isbn)
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returns bool
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as '/usr/local/pgsql/modules/isbn.so'
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language 'c';
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create function isbn_ne(isbn, isbn)
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returns bool
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as '/usr/local/pgsql/modules/isbn.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 = isbn,
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rightarg = isbn,
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-- negator = >=,
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procedure = isbn_lt
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);
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create operator <= (
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leftarg = isbn,
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rightarg = isbn,
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-- negator = >,
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procedure = isbn_le
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);
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create operator = (
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leftarg = isbn,
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rightarg = isbn,
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commutator = =,
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-- negator = <>,
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procedure = isbn_eq
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);
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create operator >= (
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leftarg = isbn,
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rightarg = isbn,
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negator = <,
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procedure = isbn_ge
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);
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create operator > (
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leftarg = isbn,
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rightarg = isbn,
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negator = <=,
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procedure = isbn_gt
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);
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create operator <> (
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leftarg = isbn,
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rightarg = isbn,
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negator = =,
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procedure = isbn_ne
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);
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--
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-- eof
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--
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