我有两个表(主 - 细节)用于记录命令,我需要创建一个触发器,允许我更新在其中的“TOTAL_GENERAL”字段主表与“SUBTOTAL”字段中的小计总和与外键“ID_ORDEN”相关的详细表中,但我得到触发器错误。当另一个表插入或更新时,Oracle触发器更新一个表
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
/
触发:
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;
这是错误消息我收到的时候我插入或更新表 “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'
尝试使用Google搜索ORA-04091并了解变异表以及如何摆脱此错误。祝一切顺利。 – Utsav