Question

我的触发器有问题。触发器的目的是在产品（＆＃34; Artigo＆＃34;）被放入账单线时更新股票（＆＃34; STOCK＆＃34;）（＆＃34; Linha_Fatura_Encomenda＆＃34;）来自法案（＆＃34; Fatura_Encomenda＆＃34;）。当我将产品放入账单时，应该验证数量（＆＃34; QUANTIDADE＆＃34;）以确保库存可以覆盖它，但这不会发生。

create or replace TRIGGER stock_disponivel_check
  BEFORE INSERT OR UPDATE OF QUANTIDADE ON LINHA_FATURA_ENCOMENDA
  FOR EACH ROW

DECLARE
  STOCK   INTEGER;
  Value_out_of_range  EXCEPTION;
  PRAGMA EXCEPTION_INIT (Value_out_of_range, -4096);

BEGIN
  UPDATE ARTIGO 
    SET STOCK = STOCK - :NEW.QUANTIDADE
    WHERE STOCK > 0;

  IF (STOCK = 0 OR STOCK <0) THEN
    RAISE Value_out_of_range;
  END IF;
EXCEPTION
  WHEN Value_out_of_range THEN
    Raise_application_error (
      -20300,
      'Stock '|| TO_CHAR(STOCK) ||' inexistente!'
    );
  WHEN NO_DATA_FOUND THEN
    Raise_application_error(-20322, 'Nenhum Valor Introduzido!');
END;

有什么想法吗？提前谢谢！

Answer 1

尝试重命名本地变量并将STOCK字段的值返回到此变量中（可能只有零行或一行更新，否则会失败）

DECLARE
  L_STOCK   INTEGER;
  Value_out_of_range  EXCEPTION;
  PRAGMA EXCEPTION_INIT (Value_out_of_range, -4096);

BEGIN
  UPDATE ARTIGO 
    SET STOCK = STOCK - :NEW.QUANTIDADE
    WHERE STOCK > 0
  RETURNING STOCK INTO L_STOCK;

  IF (L_STOCK = 0 OR L_STOCK < 0) THEN
    RAISE Value_out_of_range;
  END IF;
EXCEPTION
  WHEN Value_out_of_range THEN
    Raise_application_error (
      -20300,
      'Stock '|| TO_CHAR(L_STOCK) ||' inexistente!'
    );
  WHEN NO_DATA_FOUND THEN
    Raise_application_error(-20322, 'Nenhum Valor Introduzido!');
END;

PLSQL - 触发无响应

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