将Select选择为存储过程中的变量

Question

我尝试在我的Oracle数据库中创建一个过程,但无法实现将查询结果分配给我的变量.这是我正在尝试调试的内容:

create or replace
PROCEDURE PCD_COMBAT (identifier_perso NUMBER, identifier_advers NUMBER) AS

ATT_PERSO NUMBER;
OFF_PERSO NUMBER;
DEF_ADVERS NUMBER;

BEGIN

OFF_PERSO := SELECT OFFENSE_PERSO FROM PERSONNAGE WHERE ID_PERSO = identifier_perso;
DEF_ADVERS := SELECT DEFENSE_ADVERSAIRE FROM PERSONNAGE WHERE ID_ADVERSAIRE = identifier_advers;
ATT_PERSO := OFF_PERSO - DEF_ADVERS;
IF ATT_PERSO < 1 { ATT_PERSO := 1 };

END PCD_COMBAT;

它在Oracle Developper中清楚地表明,我的Select并没有让他高兴,也无法弄明白为什么.我读过的Oracle库,论坛和代码示例并没有多大帮助.

Answer 1

你需要使用SELECT INTO.PL/SQL你也不需要使用THEN和支撑END IF.我不太清楚你对结果做了什么.你想要还给它吗？那你需要一个FUNCTION.它应该看起来像这样(未经测试):

create or replace
FUNCTION PCD_COMBAT (identifier_perso NUMBER, identifier_advers NUMBER) 
RETURN NUMBER
AS
  ATT_PERSO NUMBER;
  OFF_PERSO NUMBER;
  DEF_ADVERS NUMBER; 
BEGIN     
  SELECT OFFENSE_PERSO 
    INTO OFF_PERSO 
    FROM PERSONNAGE 
   WHERE ID_PERSO = identifier_perso;
  SELECT DEFENSE_ADVERSAIRE 
    INTO DEF_ADVERS 
    FROM PERSONNAGE 
   WHERE ID_ADVERSAIRE = identifier_advers;

  ATT_PERSO := OFF_PERSO - DEF_ADVERS;
  IF ATT_PERSO < 1 THEN 
     ATT_PERSO := 1;
  END IF

  RETURN ATT_PERSO;

END PCD_COMBAT;