DBMS OUTPUT PUT doesn't print anything

问题

I'm new to PL/SQL and I want to show the following message. When I compile it in SQL Developer I only get

  PL/SQL procedure successfully completed.

My code is this:

SET SERVEROUTPUT ON;

DECLARE
  mesaj VARCHAR2 (100) := 'PL/SQL';
BEGIN
  DBMS_OUTPUT.PUT(mesaj);
END;
/

回答1:

You need to add an end-of-line marker by calling DBMS_OUTPUT.NEW_LINE;. End-of-line marker is added by PUT_LINE but not by PUT.

SET SERVEROUTPUT ON;

DECLARE
  mesaj VARCHAR2 (100) := 'PL/SQL';
BEGIN
  DBMS_OUTPUT.PUT(mesaj);
  DBMS_OUTPUT.NEW_LINE;
END;
/

来源：https://stackoverflow.com/questions/34731685/dbms-output-put-doesnt-print-anything