Postgresql dynamic sql syntax error - postgresql

Question

I have a function that accepts an array of table names and loops through the array to create a trigger for each table. The function compiles and is created with no errors.
When I go try to run the function I keep getting the following error and I am not sure what's wrong with my syntax
ERROR:
ERROR: unterminated quoted string at or near "';
ELSE
RAISE EXCEPTION ''[audit.if_modified_func] - Trigger func added as trigger for unhandled case: %, %'',TG_OP, TG_LEVEL;
RETURN NULL;
END IF;
INSERT INTO audit.Organization VALUES (audit_row.*);
RETURN null;
END;
"
LINE 53: audit_row.statement_only = 't';
^
USAGE:
SELECT audit.temp_create_trigger(ARRAY['Organization'])
Here's the function:
CREATE OR REPLACE FUNCTION audit.temp_create_trigger(table_names character varying[])
RETURNS character varying AS
$BODY$
DECLARE
table_name varchar;
i int;
BEGIN
FOR i in 1..array_upper(table_names, 1) LOOP
EXECUTE format('CREATE OR REPLACE FUNCTION audit.trigger_function_%1$s() RETURNS TRIGGER AS $$
DECLARE
audit_row audit.%1$s;
include_values boolean;
log_diffs boolean;
h_old hstore;
h_new hstore;
excluded_cols text[] = ARRAY[]::text[];
BEGIN
IF TG_WHEN <> ''AFTER'' THEN
RAISE EXCEPTION ''audit.trigger_function_%1$s may only run as an AFTER trigger'';
END IF;
audit_row = ROW(
nextval(''audit.%1$s_event_id_seq''), -- event_id
TG_TABLE_SCHEMA::text, -- schema_name
TG_TABLE_NAME::text, -- table_name
TG_RELID, -- relation OID for much quicker searches
session_user::text, -- session_user_name
current_timestamp, -- action_tstamp_tx
statement_timestamp(), -- action_tstamp_stm
clock_timestamp(), -- action_tstamp_clk
txid_current(), -- transaction ID
current_setting(''application_name''), -- client application
inet_client_addr(), -- client_addr
inet_client_port(), -- client_port
current_query(), -- top-level query or queries (if multistatement) from client
substring(TG_OP,1,1), -- action
NULL, NULL, -- row_data, changed_fields
''f'' -- statement_only
);
IF NOT TG_ARGV[0]::boolean IS DISTINCT FROM ''f''::boolean THEN
audit_row.client_query = NULL;
END IF;
IF TG_ARGV[1] IS NOT NULL THEN
excluded_cols = TG_ARGV[1]::text[];
END IF;
IF (TG_OP = ''UPDATE'' AND TG_LEVEL = ''ROW'') THEN
audit_row.row_data = hstore(OLD.*) - excluded_cols;
audit_row.changed_fields = (hstore(NEW.*) - audit_row.row_data) - excluded_cols;
IF audit_row.changed_fields = hstore('') THEN
-- All changed fields are ignored. Skip this update.
RETURN NULL;
END IF;
ELSIF (TG_OP = ''DELETE'' AND TG_LEVEL = ''ROW'') THEN
audit_row.row_data = hstore(OLD.*) - excluded_cols;
ELSIF (TG_OP = ''INSERT'' AND TG_LEVEL = ''ROW'') THEN
audit_row.row_data = hstore(NEW.*) - excluded_cols;
ELSIF (TG_LEVEL = ''STATEMENT'' AND TG_OP IN (''INSERT'',''UPDATE'',''DELETE'',''TRUNCATE'')) THEN
audit_row.statement_only = ''t'';
ELSE
RAISE EXCEPTION ''''[audit.if_modified_func] - Trigger func added as trigger for unhandled case: %%, %%'''',TG_OP, TG_LEVEL;
RETURN NULL;
END IF;
INSERT INTO audit.%1$s VALUES (audit_row.*);
RETURN null;
END;
$$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION audit.trigger_function_%1$s()
OWNER TO postgres;', table_names[i]);
EXECUTE format('CREATE TRIGGER audit.%1$s_trigg
BEFORE INSERT OR UPDATE
ON audit.%1$s
FOR EACH ROW
EXECUTE PROCEDURE audit.trigger_function_%1$s();', table_names[i]);
END LOOP;
RETURN 'SUCCESS';
END;
$BODY$
LANGUAGE plpgsql
COST 100;
ALTER FUNCTION audit.temp_create_trigger(character varying[])
OWNER TO postgres;

Answer 1

There are missing and superfluous quotes :
--IF audit_row.changed_fields = hstore('') THEN -- missing quotes
IF audit_row.changed_fields = hstore('''') THEN
.....
--RAISE EXCEPTION ''''[audit.if_modified_func] - Trigger func added as trigger for unhandled case: %%, %%'''',TG_OP, TG_LEVEL; --more quotes then needed
RAISE EXCEPTION ''[audit.if_modified_func] - Trigger func added as trigger for unhandled case: %%, %%'',TG_OP, TG_LEVEL;