为什么在PL/Sql程序运行时打印新旧值。？

Question

当我运行以下输出时。
宣布 输入数据 VARCHAR2(1024); 开始 输入数据 :='&&输入数据' ; Dbms_Output.put_line('输入的值是：' || inputData); 结尾; /

Enter value for inputdata: check
old   4:         inputData :='&&inputData' ;
new   4:         inputData :='check' ;
Value entered is:check

PL/SQL procedure successfully completed.

But i Want to know the reason why old and new value print.I know How to off it.
i just want to know reason.

Answer 1

您可以使用set verify off关闭新旧数值显示。希望下面的 sn-p 有所帮助。

SQL> SET VERIFY OFF;
SQL> set serveroutput on;
SQL> DECLARE
  2    inputData VARCHAR2(1024);
  3  BEGIN
  4    inputData :='&&inputData' ;
  5    Dbms_Output.put_line('Value entered is:' || inputData);
  6  END;
  7  /
Enter value for inputdata: test
Value entered is:test

PL/SQL procedure successfully completed.

SQL>