将数字关联到绑定变量pl/sql [英] Assinging a number to binding variable pl/sql

问题描述

我正在尝试将数字值分配给绑定变量以进行pl/sql分配，这给了我错误:

I am trying to assign a number value to a binding variable for a pl/sql assignment and it is giving me the error :

Error report:  
ORA-01403: no data found
ORA-06512: at line 15
01403. 00000 -  "no data found"
Cause: 
Action:
b_emp_id
------
b_emp_id

和代码

VARIABLE b_emp_id NUMBER

DECLARE

v_emp_id employees.employee_id%TYPE;
v_FIRST_NAME employees.first_name%TYPE;
v_LAST_NAME employees.last_name%TYPE;
v_JOB_ID employees.job_id%TYPE;
v_HIRE_DATE employees.hire_date%TYPE;
v_message VARCHAR2(30);
v_difference NUMBER(3);

BEGIN

:b_emp_id:=110;

 SELECT EMPLOYEE_ID, FIRST_NAME, LAST_NAME, job_id, HIRE_DATE 
 INTO v_emp_id, v_FIRST_NAME, v_LAST_NAME, v_JOB_ID, v_HIRE_DATE
 FROM employees
 WHERE EMPLOYEE_ID = :b_emp_id;

提前谢谢大家！

推荐答案

这似乎是SQL Developer的问题，我在

This seems to be a problem with SQL Developer, which I noticed on a recent answer. The code you have will work in SQL*Plus. This shows the problem too:

variable b_emp_id number
set serveroutput on
begin
    :b_emp_id := 110;
    if :b_emp_id is null then
        dbms_output.put_line('b_emp_id is null');
    else
        dbms_output.put_line('b_emp_id is not null: ' || :b_emp_id);
    end if;
end;
/
print b_emp_id;

anonymous block completed
b_emp_id is null

B_EMP_ID
---
110

在SQL * Plus中提供:

In SQL*Plus that gives:

b_emp_id is not null: 110

PL/SQL procedure successfully completed.

B_EMP_ID
---
110

...正如您所期望的. select 110 into :b_emp_id from dual技巧在这里也不起作用.无论哪种方式，分配给bind变量的值都无法在块内部使用，但是在外部可见，这很奇怪.我认为这是一个SQL Developer错误，尽管我认为它可能只是不确定的行为.

... as you'd expect. The select 110 into :b_emp_id from dual trick doesn't work here either. Either way the value assigned to the bind variable isn't usable inside the block, but is visible outside, which is weird. I assume it's an SQL Developer bug, though I guess it might just be undefined behaviour.

似乎唯一的选择是使用单独的exec块，因为在您击中实际块时，设置在其中的绑定值将在范围内(如Max所建议)；或使用替代变量代替；还是使用局部变量(在declare块中)而不是在外部声明的variable-取决于您为什么要这样做，并首先使用显式绑定变量.

It seems your only options are to use a separate exec block, since the bind value set within that is then in scope when you hit your real block (as Max suggested); or to use substitution variables instead; or to use a local variable (in the declare block) rather than an externally-declared variable - depends why you're doing it quite like this and using an explicit bind variable in the first place.

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