出現原因，是因為在更新的的表和讀取的表是同一個表。
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更新數據時有錯誤,有重復'); END IF; end;
出現錯誤時，是因為觸發器在T_userupdateT在T_user上，觸發器內部有讀取了T_user所以有錯誤。
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更新數據時有錯誤,有重復'); END IF;COMMIT; end;
多了PRAGMA AUTONOMOUS_TRANSACTION;COMMIT;兩句
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