如何在plpgsql中使用函数内部变量

Question

我将来自触发器的值存储到函数内部的变量中。当我在函数内部使用变量时出现错误。以下是我的函数和触发器

CREATE OR REPLACE FUNCTION 
edm.automated_builder_update_trigger_manual()
RETURNS trigger AS
$BODY$
DECLARE
    e record;
    weekly_permit_table text := TG_ARGV[0];
BEGIN


Update  edm.weekly_permit_table as a
set applicant = applicant||' '||'-'||' '||new.builder where 
old.permit_number = split_part(a.permit_details, ' ',1);


RETURN NULL;
END;

而我的触发器

CREATE TRIGGER builder_update_trigger_manual
 AFTER UPDATE
 ON edm.permit_table_manual_05_2017
 FOR EACH ROW
 WHEN (((old.builder)::text IS DISTINCT FROM (new.builder)::text))
 EXECUTE PROCEDURE 
edm.automated_builder_update_trigger_manual('weekly_permit_report_05_2017');

当我更新'edm.permit_table_manual_05_2017'表中的构建器值时，出现错误'错误：关系edm.weekly_permit_table不存在'

我知道这可能很愚蠢。 但不确定我在哪里错。

Answer 1

CREATE OR REPLACE FUNCTION edm.automated_builder_update_trigger_manual()
RETURNS trigger AS
$BODY$
DECLARE
  e record;
  weekly_permit_table text := TG_ARGV[0];
BEGIN
  EXECUTE 
    format(
      $q$
        UPDATE edm.%I AS a SET
          applicant = concat(applicant,' - '||$1)
        WHERE 
          $2 = split_part(a.permit_details, ' ',1)$q$,
      weekly_permit_table)
    USING NEW.builder, OLD.permit_number;
  RETURN NULL;
END $BODY$;

关于EXECUTE