Oracle DBMS_UTILITY.FORMAT_CALL_STACK和DBMS_UTILITY.FORMAT_ERROR_STACK的Postgres替代方案

Question

对于Oracle、DBMS_UTILITY.FORMAT_CALL_STACK和DBMS_UTILITY.FORMAT_ERROR_STACK，Postgres中的相等/最近的替代方案是什么？

Answer 1

您可以使用GET DIAGNOSTICS或GET STACKED DIAGNOSTICS语句并读取PG_CONTEXT字段。

CREATE OR REPLACE FUNCTION outer_func() RETURNS integer AS $$
BEGIN
  RETURN inner_func();
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION inner_func() RETURNS integer AS $$
DECLARE
  stack text;
BEGIN
  GET DIAGNOSTICS stack = PG_CONTEXT;
  RAISE NOTICE E'--- Call Stack ---\n%', stack;
  RETURN 1;
END;
$$ LANGUAGE plpgsql;

SELECT outer_func();

NOTICE:  --- Call Stack ---
PL/pgSQL function inner_func() line 5 at GET DIAGNOSTICS
PL/pgSQL function outer_func() line 3 at RETURN
CONTEXT:  PL/pgSQL function outer_func() line 3 at RETURN
outer_func
------------
        1
(1 row)