Question

我有几个无法在Oracle SQL Developer 18.2.0.183中运行的块。我不确定是否在块中遗漏了某些东西，或者是否需要对开发人员进行一些更改。下面的块输出“在命令-中从第1行开始出错”。（用于声明）。

declare
total_purchases number(7,2);
begin
total_purchases :=20;
case
when (total_purchases>200) then dbms_output.put_line(‘high’);
when (total_purchases>100) and total_purchases<200) then dbms_output.put_line(‘mid);
when (total_purchases<100) then dbms_output.put_line(‘low’);
end case;
end

它还会输出以下内容：

感谢您的帮助。谢谢。

Answer 1

我用“ ^”标记

declare
  total_purchases number(7,2);
begin
  total_purchases :=20;
  case 
       when (total_purchases>200) then dbms_output.put_line('high');
       when ((total_purchases>100) and total_purchases<200) then dbms_output.put_line('mid');
            ^                                                                             ^
       when (total_purchases<100) then dbms_output.put_line('low');
  end case;
end;
   ^

Answer 2

您有两个错字

gcc -g

替换为

when (total_purchases>100) and total_purchases<200) then dbms_output.put_line(‘mid);

Answer 3

不使用单引号（''），并且大小写定义不正确

fflush()

Answer 4

这是一种实现方法-将CASE放入DBMS_OUTPUT.PUT_LINE通话中：

SQL> set serveroutput on
SQL> DECLARE
  2     total_purchases   NUMBER (7, 2);
  3  BEGIN
  4     total_purchases := 20;
  5     DBMS_OUTPUT.put_line (CASE
  6                              WHEN total_purchases > 200
  7                              THEN
  8                                 'high'
  9                              WHEN     total_purchases > 100
 10                                   AND total_purchases < 200
 11                              THEN
 12                                 'mid'
 13                              WHEN total_purchases < 100
 14                              THEN
 15                                 'low'
 16                           END);
 17  END;
 18  /
low

PL/SQL procedure successfully completed.

SQL>

或者，如果您使用语法，请先修复错误（多余的括号，缺少分号）：

SQL> DECLARE
  2     total_purchases   NUMBER (7, 2);
  3  BEGIN
  4     total_purchases := 20;
  5
  6     CASE
  7        WHEN (total_purchases > 200)
  8        THEN
  9           DBMS_OUTPUT.put_line ('high');
 10        WHEN     (total_purchases > 100)
 11             AND total_purchases < 200
 12        THEN
 13           DBMS_OUTPUT.put_line ('mid');
 14        WHEN (total_purchases < 100)
 15        THEN
 16           DBMS_OUTPUT.put_line ('low');
 17     END CASE;
 18  END;
 19  /
low

PL/SQL procedure successfully completed.

SQL>

'PLS-00103'和'ORA-06550'错误

4 个答案: