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

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