在pl/sql中打印变量

Question

我有以下代码:

DECLARE
   v_hire_date DATE:='30-Oct-2000';
   v_six_years BOOLEAN;  
BEGIN
IF MONTHS_BETWEEN(SYSDATE,v_fecha_contrato)/12 > 6 THEN
      v_six_years:=TRUE;
ELSE
      v_six_years:=FALSE;
END IF;
DBMS_OUTPUT.PUT_LINE('flag '||v_six_years);
END;

我想打印变量的值v_six_years,但我收到错误:

ORA-06550: line 10, column 24:
PLS-00306: wrong number or types of arguments in call to '||'
ORA-06550: line 10, column 3

如何打印变量的值v_six_years？

Answer 1

看来你不能Concat的varchar和boolean.

定义此功能:

FUNCTION BOOLEAN_TO_CHAR(FLAG IN BOOLEAN)
RETURN VARCHAR2 IS
BEGIN
  RETURN
   CASE FLAG
     WHEN TRUE THEN 'TRUE'
     WHEN FALSE THEN 'FALSE'
     ELSE 'NULL'
   END;
END;

并像这样使用它:

DBMS_OUTPUT.PUT_LINE('flag '|| BOOLEAN_TO_CHAR(v_six_years));

Answer 2

您可以使用以下命令在PLSQL中打印布尔值

dbms_output.put_line('v_six_years '||  sys.diutil.bool_to_int(v_six_years));