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-- ######################################################################### |
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-- # Gedafe relies on application logic being implemented in PostgreSQL |
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-- # here are some code fragments which may help |
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-- ######################################################################### |
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-- # Tobias Oetiker <oetiker@ee.ethz.ch> |
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-- ######################################################################### |
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|
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-- Register PLPGSQL |
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-- ================ |
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-- Without this you will not be able to implement any sensible stored |
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-- Procedures. Note that you have to adjust the Path to the shared library |
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|
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create function plpgsql_call_handler() returns opaque |
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as '/usr/pack/postgresql-7.0.3-to/lib/plpgsql.so' |
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language 'C'; |
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|
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create trusted procedural language 'plpgsql' |
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handler plpgsql_call_handler |
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lancompiler 'PL/pgSQL'; |
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|
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-- Raise an exception |
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-- ================== |
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-- Sometimes you may want to print an error message to the user. |
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-- Here is an example how this could be done |
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|
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CREATE FUNCTION elog(text) RETURNS BOOLEAN |
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AS 'BEGIN RAISE EXCEPTION ''%s'', $1 ; END;' |
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LANGUAGE 'plpgsql'; |
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|
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|
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-- Example use for elog(). This prevents updates to records in the |
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-- personel table unless they refer to the current user. |
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|
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CREATE RULE personel_update_test AS |
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ON UPDATE TO personel |
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WHERE new.name != old.name OR new.name != current_user |
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DO INSTEAD SELECT elog('You can only Update your own Records'); |
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|
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|
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-- Group Membership Test |
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-- ===================== |
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-- Test if a user is a member of a specific Group |
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|
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CREATE FUNCTION getgroup(name,int4) RETURNS int4 AS ' |
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SELECT grolist[$2] |
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FROM pg_group |
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WHERE groname = $1' LANGUAGE 'sql'; |
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|
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CREATE FUNCTION ingroup(name) RETURNS BOOLEAN AS ' |
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DECLARE |
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group ALIAS FOR $1; |
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fuid int4; |
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uid int4; |
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i int4; |
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BEGIN |
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SELECT INTO uid usesysid |
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FROM pg_user |
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WHERE usename = getpgusername(); |
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IF NOT FOUND THEN RETURN FALSE; END IF; |
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i := 1; |
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LOOP |
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SELECT INTO fuid getgroup(group,i); |
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IF NOT FOUND THEN RETURN FALSE; END IF; |
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IF fuid IS NULL THEN RETURN FALSE; END IF; |
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IF fuid = uid THEN RETURN TRUE; END IF; |
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i := i+1; |
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END LOOP; |
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RETURN FALSE; |
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END; |
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' LANGUAGE 'plpgsql'; |
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|
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|
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-- Nice Trim |
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-- ========= |
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-- Trim a Long Text string in a sensible fashion |
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|
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DROP FUNCTION nicetrim (text, int4); |
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CREATE FUNCTION nicetrim (text, int4) RETURNS text AS ' |
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DECLARE |
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str ALIAS FOR $1; |
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len ALIAS FOR $2; |
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BEGIN |
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IF char_length(str) > len THEN |
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RETURN substring(str from 1 for len) || '' [...]''; |
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END IF; |
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RETURN str; |
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END; |
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' LANGUAGE 'plpgsql'; |
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|
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|
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-- HumanID to ID |
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-- ============= |
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-- Figure out the id of a record from its hid |
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|
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CREATE FUNCTION hid2id(NAME) returns int4 |
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AS 'SELECT personel_id FROM personel WHERE personel_hid = $1 ' |
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LANGUAGE 'sql'; |
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|
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|
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