oracle 表发生了变化,Oracle触发器表发生了变化 触发器不能读它的解决方法(必看)...

出现原因，是因为在更新的的表和读取的表是同一个表。

CREATE or replace TRIGGER T_userupdateT BEFORE update ON T_user REFERENCING OLD AS old NEW AS N_ROW FOR EACH ROW

DECLARE U_xtfidemp1 varchar(36);

u_xtempcode1 varchar(20);

u_xtempcodeCount int:=0;

U_xtfidempCount int:=0;

u_id1 int:=0;

BEGIN

U_xtfidemp1:=:N_ROW.U_xtfidemp;

u_xtempcode1:=:N_ROW.u_xtempcode;

u_id1:=:N_ROW.u_id;

select count(u_xtempcode) into u_xtempcodeCount from eas.T_user where u_xtempcode is not null and u_xtempcode=u_xtempcode1 and u_id<>u_id1;

select count(U_xtfidemp) into U_xtfidempCount from eas.T_user where U_xtfidemp is not null and U_xtfidemp=U_xtfidemp1 and u_id<>u_id1;

IF u_xtempcodeCount>0 or U_xtfidempCount>0 THEN

RAISE_APPLICATION_ERROR(-20001, 'eas.T_user u_xtempcode,U_xtfidemp,U_GZCode更新数据时有错误,有重复');

END IF;

end;

出现错误时，是因为触发器在T_userupdateT在T_user上，触发器内部有读取了T_user所以有错误。

修改如下

CREATE or replace TRIGGER T_userupdateT BEFORE update ON T_user REFERENCING OLD AS old NEW AS N_ROW FOR EACH ROW

DECLARE U_xtfidemp1 varchar(36);

u_xtempcode1 varchar(20);

u_xtempcodeCount int:=0;

U_xtfidempCount int:=0;

u_id1 int:=0;

PRAGMA AUTONOMOUS_TRANSACTION;

BEGIN

U_xtfidemp1:=:N_ROW.U_xtfidemp;

u_xtempcode1:=:N_ROW.u_xtempcode;

u_id1:=:N_ROW.u_id;

select count(u_xtempcode) into u_xtempcodeCount from eas.T_user where u_xtempcode is not null and u_xtempcode=u_xtempcode1 and u_id<>u_id1;

select count(U_xtfidemp) into U_xtfidempCount from eas.T_user where U_xtfidemp is not null and U_xtfidemp=U_xtfidemp1 and u_id<>u_id1;

IF u_xtempcodeCount>0 or U_xtfidempCount>0 THEN

RAISE_APPLICATION_ERROR(-20001, 'eas.T_user u_xtempcode,U_xtfidemp,U_GZCode更新数据时有错误,有重复');

END IF;

COMMIT;

end;

多了PRAGMA AUTONOMOUS_TRANSACTION;COMMIT;两句