ora-04091 表XX发生了变化 触发器/函数不能读 的错误处理

CREATE TABLE CKSP.PRODUCTS

(

ID     NUMBER(1)     NOT NULL,

NAME   VARCHAR2(100) NOT NULL,

PRICE1 NUMBER(1)     NOT NULL,

PRICE2 NUMBER(1)     NOT NULL

)

TABLESPACE USERS

NOLOGGING

PCTFREE 10

PCTUSED 0

INITRANS 1

MAXTRANS 255

STORAGE(BUFFER_POOL DEFAULT)

NOPARALLEL

NOCACHE

CREATE OR REPLACE TRIGGER TRG_PRODUCTS_INSERT

BEFORE INSERT

ON PRODUCTS

REFERENCING OLD AS OLD NEW AS NEW

FOR EACH ROW

declare

varCount number;

begin

select count(id) into varCount from products where name = :new.name;

if varCount > 0 then

varCount:= varCount +1;

:new.name :=varCount||'_'||:new.name;

end if;

end;

begin

    insert into products values(1,'p1',1,2);

    insert into products

    select 2 as id ,name ,price1,price2 from products where id= 1;

end;

declare

    varName varchar2(100);

    varPrice1 number;

    varPrice2 number;

begin

    insert into products values(1,'p1',1,2);

    select name,price1,price2 into varName,varPrice1,varPrice2 from products where id =1;

    insert into products values(2,varName,varprice1,varPrice2);

end;