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Tweak the API for per-datatype typmodin functions so that they are passed

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an array of strings rather than an array of integers, and allow any simple
constant or identifier to be used in typmods; for example
	create table foo (f1 widget(42,'23skidoo',point));
Of course the typmodin function has still got to pack this info into a
non-negative int32 for storage, but it's still a useful improvement in
flexibility, especially considering that you can do nearly anything if you
are willing to keep the info in a side table.  We can get away with this
change since we have not yet released a version providing user-definable
typmods.  Per discussion.
This commit is contained in:
Tom Lane
2007-06-15 20:56:52 +00:00
parent 839fcc9fd0
commit 23347231a5
16 changed files with 113 additions and 62 deletions
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10
doc/src/sgml/ref/create_type.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/create_type.sgml,v 1.71 2007/05/12 00:54:59 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/create_type.sgml,v 1.72 2007/06/15 20:56:49 tgl Exp $
PostgreSQL documentation
-->
@ -195,11 +195,11 @@ CREATE TYPE <replaceable class="parameter">name</replaceable>
are needed if the type supports modifiers, that is optional constraints
attached to a type declaration, such as <literal>char(5)</> or
<literal>numeric(30,2)</>. <productname>PostgreSQL</productname> allows
user-defined types to take one or more integer constants as modifiers;
however, this information must be capable of being packed into a single
non-negative integer value for storage in the system catalogs. The
user-defined types to take one or more simple constants or identifiers as
modifiers; however, this information must be capable of being packed into a
single non-negative integer value for storage in the system catalogs. The
<replaceable class="parameter">type_modifier_input_function</replaceable>
is passed the declared modifier(s) in the form of an <type>integer</>
is passed the declared modifier(s) in the form of a <type>cstring</>
array. It must check the values for validity (throwing an error if they
are wrong), and if they are correct, return a single non-negative
<type>integer</> value that will be stored as the column <quote>typmod</>.