The mutation of error

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• The mutation of error in PL/SQL... can not find a solution

  So I have this table:
  
  create table weight)
  ident done int refers to users.
  date of dateW,
  float weight,
  primary key (ident, dateW)
  );
  
  I have a function called BMI who given a userid (ident) calculates the BMI (body mass index) based on the height of the user (it's on the users table) and the weight of the user is put on the table of characters. The feature works very well. Now I want to relax that when the user inserts a new weight, the trigger checks BMI of this user and see if it to reasonable values. I have this:
  
  create or replace
  relaxation BMITG
  After the insertion on the WEIGHT
  for each line
  declare
  int ident;
  Start
  ident: =: new.ident;
  If BMI (ident) NOT BETWEEN 17 AND 25
  then DBMS_OUTPUT. Put_line ('bad BMI');
  end if;
  end;
  
  The trigger compiles fine, but when I try to insert weights I get:
  
  Error from the 1 in the command line:
  insert into a values (1, to_date('2013-01-30','yyyy-mm-dd'), 73) weight
  Error report:
  SQL error: ORA-04091: table MyDB.WEIGHTS is changing, function of triggering/can not see
  ORA-06512: at "MyDB.BMI", line 6
  ORA-06512: at "MyDB.BMITG", line 5
  ORA-04088: error during execution of trigger 'MyDB.BMITG '.
  04091 00000 - "table %s.%s is changing, function of triggering/can not see.
  * Cause: A trigger (or plsql user-defined function that is referenced in)
  This statement) attempted to watch (or modify) a table that has been
  in the Middle being modified by the statement that shot.
  * Action: Rewrite the trigger (or function) so it does not read this table.
  
  I'm not so sure about the DBMS_OUTPUT. PUT_LINE. Which function to use to alert a user that the BMI is not good? I'll need to convey this message to a Web site through apache/php
  
  Kind regards
  Daniel

  A level trigger line on WEIGHT cannot query the table of CHARACTERS (or call a function that queries the table of CHARACTERS). In doing so, as you've found, will trigger an error table mutation.

  I'm not sure I understand why you should query the table of CHARACTERS, however. If you insert a row into the table of CHARACTERS, which is the line with the weight that you want to use for the calculation, which is probably be the line with the last DATEW or not (if you insert never back-dated lines DATEW, then the line you insert is the line you want to use for the calculation and the line with the last value DATEW).

  As a general rule, I would say that the BMI function should accept a height and weight. In your trigger, you question the USERS table to get the height. Then you would spend the height and the: new.weight the new feature of the IMC.

  Justin

• Table is the mutation of error in after the update trigger

  Hello
  
  In all of my table, I have columns EDITDATE and EDITUSER. So whenever a table is updated I need to update these two fields with the USER and SYSDATE. For this I use a BEFORE UPDATE trigger. This trigger is activated, but I get "ORA-04091: table %s.%s is changing, function of triggering/can not see" error every time I update the table. I used this method in SQL Server. I understand that Oracle doesn't have to be the same as SQL Server but I do not know there is a way to do this. Do you know what it is?
  
  EDIT: Here is the Code of the trigger
  
  create or replace
  TR_LEGISLATION_CALCUL_AE RELAXATION
  BEFORE THE UPDATE
  ON LEGISLATION_CALCUL
  FOR EACH LINE
  DECLARE
  v_LEGISLATIONCALCULID NUMBER (10,0);
  
  BEGIN
  SELECT: NEW. LEGISLATIONCALCULID
  
  IN v_LEGISLATIONCALCULID
  FROM DUAL;
  UPDATE LEGISLATION_CALCUL
  SET EDITUSER_ID = UID,
  EDITDATE = SYSDATE
  WHERE LEGISLATIONCALCULID = v_LEGISLATIONCALCULID;
  END;
  
  Published by: Mikhail on 12 March 2012 23:54

  Mikhail says:
  Hello

  In all of my table, I have columns EDITDATE and EDITUSER. So whenever a table is updated I need to update these two fields with the USER and SYSDATE. For this I use the AFTER UPDATE trigger. This trigger is activated, but I get "ORA-04091: table %s.%s is changing, function of triggering/can not see" error every time I update the table. I used this method in SQL Server. I understand that Oracle doesn't have to be the same as SQL Server but I do not know there is a way to do this. Do you know what it is?

  EDIT: Here is the Code of the trigger

  create or replace
  TR_LEGISLATION_CALCUL_AE RELAXATION
  BEFORE THE UPDATE
  ON LEGISLATION_CALCUL
  FOR EACH LINE

  just put this in your before update (and not after the update as you mentioned) for each trigger line:

  BEGIN
  
  :new.EDITUSER_ID := UID;
  :new.EDITDATE := SYSDATE;
  
  END;
  

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