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Make LANCOMPILER clause in CREATE LANGUAGE optional. Allow "identifier"

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syntax for language names (instead of 'string').

createlang now handles the case where a second language uses the same call
handler as an already installed language (e.g., plperl/plperlu).

droplang now handles the reverse case, i.e., dropping a language where
the call handler is still used by another language.  Moreover, droplang
can now be used to drop any user-defined language, not just the supplied
ones.
This commit is contained in:
Peter Eisentraut
2001-08-13 21:34:54 +00:00
parent 38cfc95865
commit ee8ed85da3
7 changed files with 118 additions and 123 deletions
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23
doc/src/sgml/ref/create_function.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_function.sgml,v 1.24 2001/06/04 23:27:23 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_function.sgml,v 1.25 2001/08/13 21:34:51 petere Exp $
-->
<refentry id="SQL-CREATEFUNCTION">
@ -18,12 +18,12 @@ $Header: /cvsroot/pgsql/doc/src/sgml/ref/create_function.sgml,v 1.24 2001/06/04
CREATE FUNCTION <replaceable class="parameter">name</replaceable> ( [ <replaceable class="parameter">argtype</replaceable> [, ...] ] )
RETURNS <replaceable class="parameter">rettype</replaceable>
AS '<replaceable class="parameter">definition</replaceable>'
LANGUAGE '<replaceable class="parameter">langname</replaceable>'
LANGUAGE <replaceable class="parameter">langname</replaceable>
[ WITH ( <replaceable class="parameter">attribute</replaceable> [, ...] ) ]
CREATE FUNCTION <replaceable class="parameter">name</replaceable> ( [ <replaceable class="parameter">argtype</replaceable> [, ...] ] )
RETURNS <replaceable class="parameter">rettype</replaceable>
AS '<replaceable class="parameter">obj_file</replaceable>', '<replaceable class="parameter">link_symbol</replaceable>'
LANGUAGE '<replaceable class="parameter">langname</replaceable>'
LANGUAGE <replaceable class="parameter">langname</replaceable>
[ WITH ( <replaceable class="parameter">attribute</replaceable> [, ...] ) ]
</synopsis>
</refsynopsisdiv>
@ -123,13 +123,14 @@ CREATE FUNCTION <replaceable class="parameter">name</replaceable> ( [ <replaceab
<listitem>
<para>
May be '<literal>sql</literal>', '<literal>C</literal>',
'<literal>internal</literal>', or '<replaceable
class="parameter">plname</replaceable>', where '<replaceable
class="parameter">plname</replaceable>' is the name of a
May be <literal>SQL</literal>, <literal>C</literal>,
<literal>internal</literal>, or <replaceable
class="parameter">plname</replaceable>, where <replaceable
class="parameter">plname</replaceable> is the name of a
created procedural language. See
<xref linkend="sql-createlanguage">
for details.
for details. For backward compatibility, the name may be
enclosed by single quotes.
</para>
</listitem>
</varlistentry>
@ -261,7 +262,7 @@ CREATE FUNCTION <replaceable class="parameter">name</replaceable> ( [ <replaceab
<programlisting>
CREATE FUNCTION one() RETURNS integer
AS 'SELECT 1 AS RESULT;'
LANGUAGE 'sql';
LANGUAGE SQL;
SELECT one() AS answer;
<computeroutput>
@ -281,7 +282,7 @@ SELECT one() AS answer;
<programlisting>
CREATE FUNCTION ean_checkdigit(char, char) RETURNS boolean
AS '/usr1/proj/bray/sql/funcs.so' LANGUAGE 'c';
AS '/usr1/proj/bray/sql/funcs.so' LANGUAGE C;
CREATE TABLE product (
id char(8) PRIMARY KEY,
@ -306,7 +307,7 @@ CREATE TABLE product (
<programlisting>
CREATE FUNCTION point(complex) RETURNS point
AS '/home/bernie/pgsql/lib/complex.so', 'complex_to_point'
LANGUAGE 'c';
LANGUAGE C;
</programlisting>
The C declaration of the function could be: