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From: Larry Rosenman <ler@lerctr.org>
To: pgsql-sql@postgresql.org
Subject: PL/pgSQL: Logging Trigger. Advice/comments/other?
Date: Wed, 14 May 2003 15:04:21 -0500
Message-ID: <382520000.1052942661@lerlaptop-red.iadfw.net> (raw)

Ok, I finally finished this damn trigger to log changes to ONE frapping 
table.

I'm wondering if any of you PL/pgSQL guru's out there see any better way to 
do
this:

CREATE OR REPLACE FUNCTION networks_trigger_log () RETURNS "trigger"
    AS 'DECLARE
    record_fields_old text;
    record_values_old text;
    record_fields_new text;
    record_values_new text;
    query_string_old text;
    query_string_new text;
    BEGIN
    query_string_old := ''INSERT INTO networks_log'';
    query_string_new := ''INSERT INTO networks_log'';
    record_fields_old := ''user_id,update_at,update_type,update_ver'';
    record_fields_new := ''user_id,update_at,update_type,update_ver'';
    record_values_old := ''CURRENT_USER,CURRENT_TIMESTAMP,'' ||
            quote_literal(TG_OP) || '','' || quote_literal(''O'');
    record_values_new := ''CURRENT_USER,CURRENT_TIMESTAMP,'' ||
            quote_literal(TG_OP) || '','' || quote_literal(''N'');
    IF TG_OP = ''INSERT''
    THEN
        record_fields_new := record_fields_new || '','' ||
                      quote_ident(''netblock'');
        record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.netblock::inet::text) ;
        IF NEW.router NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''router'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.router) ;
        END IF;
        IF NEW.interface NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''interface'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.interface) ;
        END IF;
        IF NEW.dest_ip NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''dest_ip'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.dest_ip::text) ;
        END IF;
        IF NEW.mis_token NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''mis_token'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.mis_token) ;
        END IF;
        IF NEW.assigned_date NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''assigned_date'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.assigned_date) ;
        END IF;
        IF NEW.assigned_by NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''assigned_by'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.assigned_by) ;
        END IF;
        IF NEW.justification_now NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''justification_now'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.justification_now) ;
    	END IF;
        IF NEW.justification_1yr NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''justification_1yr'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.justification_1yr) ;
    	END IF;
        IF NEW.cust_asn NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''cust_asn'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.cust_asn) ;
    	END IF;
        IF NEW.comments NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''comments'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.comments) ;
    	END IF;
        IF NEW.other_reference NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''other_reference'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.other_reference) ;
    	END IF;
        IF NEW.parent_asn NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''parent_asn'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.parent_asn) ;
    	END IF;
        IF NEW.status NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''status'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.status) ;
    	END IF;
        IF NEW.purpose NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''purpose'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.purpose) ;
    	END IF;
        IF NEW.customer_reference NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''customer_reference'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.customer_reference) ;
    	END IF;
        IF NEW.natblock NOTNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''natblock'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.natblock) ;
    	END IF;
        query_string_new := query_string_new || ''('' ||
                     record_fields_new || '') VALUES('' ||
                     record_values_new || '')'';
        EXECUTE query_string_new;
        RETURN new;
    END IF;
    IF TG_OP = ''DELETE''
    THEN
        record_fields_old := record_fields_old || '','' ||
                      quote_ident(''netblock'');
        record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.netblock::inet::text) ;
        IF OLD.router NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''router'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.router) ;
        END IF;
        IF OLD.interface NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''interface'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.interface) ;
        END IF;
        IF OLD.dest_ip NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''dest_ip'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.dest_ip::text) ;
        END IF;
        IF OLD.mis_token NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''mis_token'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.mis_token) ;
        END IF;
        IF OLD.assigned_date NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''assigned_date'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.assigned_date) ;
        END IF;
        IF OLD.assigned_by NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''assigned_by'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.assigned_by) ;
        END IF;
        IF OLD.justification_now NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''justification_now'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.justification_now) ;
    	END IF;
        IF OLD.justification_1yr NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''justification_1yr'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.justification_1yr) ;
    	END IF;
        IF OLD.cust_asn NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''cust_asn'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.cust_asn) ;
    	END IF;
        IF OLD.comments NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''comments'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.comments) ;
    	END IF;
        IF OLD.other_reference NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''other_reference'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.other_reference) ;
    	END IF;
        IF OLD.parent_asn NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''parent_asn'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.parent_asn) ;
    	END IF;
        IF OLD.status NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''status'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.status) ;
    	END IF;
        IF OLD.purpose NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''purpose'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.purpose) ;
    	END IF;
        IF OLD.customer_reference NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''customer_reference'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.customer_reference) ;
    	END IF;
        IF OLD.natblock NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''natblock'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.natblock) ;
    	END IF;
        query_string_old := query_string_old || ''('' ||
                     record_fields_old || '') VALUES('' ||
                     record_values_old || '')'';
        EXECUTE query_string_old;
        RETURN old;
    END IF;
    IF TG_OP = ''UPDATE''
    THEN
        record_fields_old := record_fields_old || '','' ||
                      quote_ident(''netblock'');
        record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.netblock::inet::text) ;
        record_fields_new := record_fields_new || '','' ||
                      quote_ident(''netblock'');
        record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.netblock::inet::text) ;
        IF NEW.router NOTNULL  AND OLD.router NOTNULL AND
          NEW.router <> OLD.router
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''router'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.router) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''router'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.router) ;
        END IF;
        IF NEW.router ISNULL  AND OLD.router NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''router'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.router) ;
        END IF;
        IF NEW.router NOTNULL  AND OLD.router ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''router'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.router) ;
        END IF;
        IF NEW.interface NOTNULL  AND OLD.interface NOTNULL AND
          NEW.interface <> OLD.interface
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''interface'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.interface) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''interface'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.interface) ;
        END IF;
        IF NEW.interface ISNULL  AND OLD.interface NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''interface'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.interface) ;
        END IF;
        IF NEW.interface NOTNULL  AND OLD.interface ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''interface'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.interface) ;
        END IF;
        IF NEW.dest_ip NOTNULL  AND OLD.dest_ip NOTNULL AND
          NEW.dest_ip <> OLD.dest_ip
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''dest_ip'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.dest_ip::text) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''dest_ip'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.dest_ip::text) ;
        END IF;
        IF NEW.dest_ip ISNULL  AND OLD.dest_ip NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''dest_ip'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.dest_ip::text) ;
        END IF;
        IF NEW.dest_ip NOTNULL  AND OLD.dest_ip ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''dest_ip'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.dest_ip::text) ;
        END IF;
        IF NEW.mis_token NOTNULL  AND OLD.mis_token NOTNULL AND
          NEW.mis_token <> OLD.mis_token
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''mis_token'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.mis_token) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''mis_token'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.mis_token) ;
        END IF;
        IF NEW.mis_token ISNULL  AND OLD.mis_token NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''mis_token'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.mis_token) ;
        END IF;
        IF NEW.mis_token NOTNULL  AND OLD.mis_token ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''mis_token'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.mis_token) ;
        END IF;
        IF NEW.assigned_date NOTNULL  AND OLD.assigned_date NOTNULL AND
          NEW.assigned_date <> OLD.assigned_date
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''assigned_date'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.assigned_date) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''assigned_date'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.assigned_date) ;
        END IF;
        IF NEW.assigned_date ISNULL  AND OLD.assigned_date NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''assigned_date'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.assigned_date) ;
        END IF;
        IF NEW.assigned_date NOTNULL  AND OLD.assigned_date ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''assigned_date'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.assigned_date) ;
        END IF;
        IF NEW.assigned_by NOTNULL  AND OLD.assigned_by NOTNULL AND
          NEW.assigned_by <> OLD.assigned_by
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''assigned_by'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.assigned_by) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''assigned_by'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.assigned_by) ;
        END IF;
        IF NEW.assigned_by ISNULL  AND OLD.assigned_by NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''assigned_by'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.assigned_by) ;
        END IF;
        IF NEW.assigned_by NOTNULL  AND OLD.assigned_by ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''assigned_by'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.assigned_by) ;
        END IF;
        IF NEW.justification_now NOTNULL  AND OLD.justification_now NOTNULL 
AND
          NEW.justification_now <> OLD.justification_now
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''justification_now'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.justification_now) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''justification_now'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.justification_now) ;
        END IF;
        IF NEW.justification_now ISNULL  AND OLD.justification_now NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''justification_now'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.justification_now) ;
        END IF;
        IF NEW.justification_now NOTNULL  AND OLD.justification_now ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''justification_now'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.justification_now) ;
        END IF;
        IF NEW.justification_1yr NOTNULL  AND OLD.justification_1yr NOTNULL 
AND
          NEW.justification_1yr <> OLD.justification_1yr
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''justification_1yr'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.justification_1yr) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''justification_1yr'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.justification_1yr) ;
        END IF;
        IF NEW.justification_1yr ISNULL  AND OLD.justification_1yr NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''justification_1yr'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.justification_1yr) ;
        END IF;
        IF NEW.justification_1yr NOTNULL  AND OLD.justification_1yr ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''justification_1yr'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.justification_1yr) ;
        END IF;
        IF NEW.cust_asn NOTNULL  AND OLD.cust_asn NOTNULL AND
          NEW.cust_asn <> OLD.cust_asn
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''cust_asn'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.cust_asn) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''cust_asn'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.cust_asn) ;
        END IF;
        IF NEW.cust_asn ISNULL  AND OLD.cust_asn NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''cust_asn'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.cust_asn) ;
        END IF;
        IF NEW.cust_asn NOTNULL  AND OLD.cust_asn ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''cust_asn'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.cust_asn) ;
        END IF;
        IF NEW.comments NOTNULL  AND OLD.comments NOTNULL AND
          NEW.comments <> OLD.comments
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''comments'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.comments) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''comments'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.comments) ;
        END IF;
        IF NEW.comments ISNULL  AND OLD.comments NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''comments'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.comments) ;
        END IF;
        IF NEW.comments NOTNULL  AND OLD.comments ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''comments'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.comments) ;
        END IF;
        IF NEW.other_reference NOTNULL  AND OLD.other_reference NOTNULL AND
          NEW.other_reference <> OLD.other_reference
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''other_reference'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.other_reference) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''other_reference'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.other_reference) ;
        END IF;
        IF NEW.other_reference ISNULL  AND OLD.other_reference NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''other_reference'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.other_reference) ;
        END IF;
        IF NEW.other_reference NOTNULL  AND OLD.other_reference ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''other_reference'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.other_reference) ;
        END IF;
        IF NEW.parent_asn NOTNULL  AND OLD.parent_asn NOTNULL AND
          NEW.parent_asn <> OLD.parent_asn
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''parent_asn'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.parent_asn) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''parent_asn'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.parent_asn) ;
        END IF;
        IF NEW.parent_asn ISNULL  AND OLD.parent_asn NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''parent_asn'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.parent_asn) ;
        END IF;
        IF NEW.parent_asn NOTNULL  AND OLD.parent_asn ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''parent_asn'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.parent_asn) ;
        END IF;
        IF NEW.status NOTNULL  AND OLD.status NOTNULL AND
          NEW.status <> OLD.status
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''status'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.status) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''status'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.status) ;
        END IF;
        IF NEW.status ISNULL  AND OLD.status NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''status'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.status) ;
        END IF;
        IF NEW.status NOTNULL  AND OLD.status ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''status'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.status) ;
        END IF;
        IF NEW.purpose NOTNULL  AND OLD.purpose NOTNULL AND
          NEW.purpose <> OLD.purpose
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''purpose'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.purpose) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''purpose'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.purpose) ;
        END IF;
        IF NEW.purpose ISNULL  AND OLD.purpose NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''purpose'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.purpose) ;
        END IF;
        IF NEW.purpose NOTNULL  AND OLD.purpose ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''purpose'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.purpose) ;
        END IF;
        IF NEW.customer_reference NOTNULL  AND OLD.customer_reference 
NOTNULL AND
          NEW.customer_reference <> OLD.customer_reference
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''customer_reference'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.customer_reference) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''customer_reference'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.customer_reference) ;
        END IF;
        IF NEW.customer_reference ISNULL  AND OLD.customer_reference 
NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''customer_reference'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.customer_reference) ;
        END IF;
        IF NEW.customer_reference NOTNULL  AND OLD.customer_reference 
ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''customer_reference'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.customer_reference) ;
        END IF;
        IF NEW.natblock NOTNULL  AND OLD.natblock NOTNULL AND
          NEW.natblock <> OLD.natblock
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''natblock'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.natblock::inet::text) ;
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''natblock'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.natblock::inet::text) ;
        END IF;
        IF NEW.natblock ISNULL  AND OLD.natblock NOTNULL
        THEN
           record_fields_old := record_fields_old || '','' ||
                      quote_ident(''natblock'');
           record_values_old := record_values_old || '','' ||
                      quote_literal(OLD.natblock::inet::text) ;
        END IF;
        IF NEW.natblock NOTNULL  AND OLD.natblock ISNULL
        THEN
           record_fields_new := record_fields_new || '','' ||
                      quote_ident(''natblock'');
           record_values_new := record_values_new || '','' ||
                      quote_literal(NEW.natblock::inet::text) ;
        END IF;
        query_string_old := query_string_old || ''('' ||
                     record_fields_old || '') VALUES('' ||
                     record_values_old || '')'';
        EXECUTE query_string_old;
        query_string_new := query_string_new || ''('' ||
                     record_fields_new || '') VALUES('' ||
                     record_values_new || '')'';
        EXECUTE query_string_new;
        RETURN new;
    END IF;
    END;'
    LANGUAGE plpgsql;


-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 972-414-9812                 E-Mail: ler@lerctr.org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749






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