我有兩個表(主 - 細節)用於記錄命令,我需要創建一個觸發器,允許我更新在其中的「TOTAL_GENERAL」字段主表與「SUBTOTAL」字段中的小計總和與外鍵「ID_ORDEN」相關的詳細表中,但我得到觸發器錯誤。當另一個表插入或更新時,Oracle觸發器更新一個表
表:
CREATE TABLE "ENCABEZADO_ORDEN"
("ID_ENCABEZADO" NUMBER(10,0),
"NUMERO_ORDEN" NUMBER(10,0),
"FECHA" DATE,
"NOMBRE_CLIENTE" VARCHAR2(50),
"DIRECCION" VARCHAR2(50),
"TOTAL_GENERAL" NUMBER(10,0),
"LUGAR_VENTA" VARCHAR2(50),
CONSTRAINT "ENCABEZADO_ORDEN_PK" PRIMARY KEY ("ID_ENCABEZADO")
USING INDEX ENABLE
)
CREATE TABLE "DETALLE_ORDEN"
("ID_DETALLE" NUMBER(10,0),
"PRODUCTO" VARCHAR2(50),
"PRECIO_UNITARIO" NUMBER(10,2),
"CANTIDAD" NUMBER(10,0),
"SUBTOTAL" NUMBER(10,2),
"ID_ENCABEZADO" NUMBER(10,0),
CONSTRAINT "DETALLE_ORDEN_PK" PRIMARY KEY ("ID_DETALLE")
USING INDEX ENABLE
)
/
ALTER TABLE "DETALLE_ORDEN" ADD CONSTRAINT "DETALLE_ORDEN_FK" FOREIGN KEY ("ID_ENCABEZADO")
REFERENCES "ENCABEZADO_ORDEN" ("ID_ENCABEZADO") ENABLE
/
觸發:
create or replace TRIGGER "CALCULAR_TOTAL_GENERAL"
BEFORE INSERT OR UPDATE ON "DETALLE_ORDEN"
FOR EACH ROW
DECLARE
V_ID_ENCABEZADO NUMBER(10,0);
BEGIN
SELECT "ID_ENCABEZADO"
INTO V_ID_ENCABEZADO
FROM "ENCABEZADO_ORDEN"
WHERE "ID_ENCABEZADO" = :NEW."ID_ENCABEZADO";
UPDATE "ENCABEZADO_ORDEN"
SET "TOTAL_GENERAL" = (SELECT SUM("SUBTOTAL") FROM "DETALLE_ORDEN"
WHERE "ID_ENCABEZADO" = V_ID_ENCABEZADO)
WHERE "ID_ENCABEZADO" = V_ID_ENCABEZADO;
END;
這是錯誤消息我收到的時候我插入或更新表 「DETALLE_ORDEN」:
1 error has occurred
ORA-04091: table CARLOSM.DETALLE_ORDEN is mutating, trigger/function may not see it
ORA-06512: at "CARLOSM.CALCULAR_TOTAL_GENERAL", line 9
ORA-04088: error during execution of trigger 'CARLOSM.CALCULAR_TOTAL_GENERAL'
嘗試使用Google搜索ORA-04091並瞭解變異表以及如何擺脫此錯誤。祝一切順利。 – Utsav