PL/SQL 标识符“字符串”必须声明

Question

谁能告诉我为什么这不会执行？

set serveroutput on ;
Declare
   TYPE type_emp IS RECORD(
        emp_name employees.last_name%TYPE,
        emp_salary employees.salary%TYPE);
     rec_emp type_emp;
   due_for_a_raise CHAR(1);
begin
   SELECT last_name, salary into rec_emp
   from employees
   where employee_id = 150;
   if emp_salary > 5000 then
      due_for_a_raise := 'Y';
     else
      due_for_a_raise := 'N';
   end if;
  dbms_output.putline(last_name);
  dbms_output.putline(salary);
  dbms_output.putline(due_for_a_raise);
end;  

错误如下，

Error report:
ORA-06550: line 11, column 6:
PLS-00201: identifier 'EMP_SALARY' must be declared
ORA-06550: line 11, column 3:
PL/SQL: Statement ignored
ORA-06550: line 16, column 23:
PLS-00201: identifier 'LAST_NAME' must be declared
ORA-06550: line 16, column 3:
PL/SQL: Statement ignored
ORA-06550: line 17, column 23:
PLS-00201: identifier 'SALARY' must be declared
ORA-06550: line 17, column 3:
PL/SQL: Statement ignored
ORA-06550: line 18, column 15:
PLS-00302: component 'PUTLINE' must be declared
ORA-06550: line 18, column 3:
PL/SQL: Statement ignored

我想我不知道为什么没有声明它，因为它们是在 type_emp 中声明的。

Answer 1

当您引用它们时，您需要使用该记录。对 dbms_output.put_line 的调用还需要在 put 和 line 之间使用下划线。

SQL> ed
Wrote file afiedt.buf

  1  Declare
  2     TYPE type_emp IS RECORD(
  3          emp_name employees.last_name%TYPE,
  4          emp_salary employees.salary%TYPE);
  5       rec_emp type_emp;
  6     due_for_a_raise CHAR(1);
  7  begin
  8     SELECT last_name, salary
  9       into rec_emp
 10       from employees
 11      where employee_id = 150;
 12     if rec_emp.emp_salary > 5000 then
 13        due_for_a_raise := 'Y';
 14       else
 15        due_for_a_raise := 'N';
 16     end if;
 17    dbms_output.put_line(rec_emp.emp_name);
 18    dbms_output.put_line(rec_emp.emp_salary);
 19    dbms_output.put_line(due_for_a_raise);
 20* end;
SQL> /

PL/SQL procedure successfully completed.