setActionListener does not work when you use the pop-up

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• It does not work when you use the trigger to check the data of the other table.

  Please help me with this, I put a trigger on a table, but it can not work as I expect.
  
  case study: a class has many students, one of them is going to match.
  The purpose of this trigger is to check when to choose a student going to match, this student has in his class where it belongs to.
  Oracle version is 10.2.0.1.0.
  

  --table:
  DROP TABLE STU;
  DROP TABLE CLASS;
  
  create table CLASS(
  CID     VARCHAR2(5)   PRIMARY KEY,
  CNAME   VARCHAR2(20)  NOT NULL,
  SCHOSEN VARCHAR2(5));
   
  create table STU(
  SID     VARCHAR2(5)   PRIMARY KEY,
  SNAME   VARCHAR2(20)  NOT NULL,
  CID     VARCHAR2(5)   NOT NULL REFERENCES CLASS(CID) ON DELETE CASCADE);
  
  --data:
  --CLASS
  INSERT INTO CLASS(CID,CNAME) VALUES(1,'SUN');
  INSERT INTO CLASS(CID,CNAME) VALUES(2,'MOON');
  INSERT INTO CLASS(CID,CNAME) VALUES(3,'EARTH');
  --STU
  INSERT INTO STU VALUES(1,'JACK',1);
  INSERT INTO STU VALUES(2,'TOM',1);
  INSERT INTO STU VALUES(3,'LILY',2);
  INSERT INTO STU VALUES(4,'DUSTIN',3);
  
  --TRIGGER
  CREATE OR REPLACE TRIGGER CHECK_SCHOSEN
  BEFORE INSERT OR UPDATE OF SCHOSEN ON CLASS
  FOR EACH ROW WHEN (NEW.SCHOSEN IS NOT NULL)
  
  DECLARE
  DUMMY INTEGER;
  INVALID_STU EXCEPTION;
  VALID_STU EXCEPTION;
  MUTATING_TABLE EXCEPTION;
  PRAGMA EXCEPTION_INIT(MUTATING_TABLE, -4091);
  
  CURSOR DUMMY_CURSOR (ST VARCHAR2, CL VARCHAR2) IS
    SELECT SID FROM STU, CLASS
    WHERE STU.SID=ST AND STU.CID=CLASS.CID AND CLASS.CID=CL
      FOR UPDATE OF CLASS.SCHOSEN;
  
  BEGIN
    OPEN DUMMY_CURSOR(:NEW.SCHOSEN, :NEW.CID);
    FETCH DUMMY_CURSOR INTO DUMMY;
    IF DUMMY_CURSOR%NOTFOUND THEN
      RAISE INVALID_STU;
    ELSE
      RAISE VALID_STU;
    END IF;
    CLOSE DUMMY_CURSOR;
  EXCEPTION
    WHEN INVALID_STU THEN
      CLOSE DUMMY_CURSOR;
      DBMS_OUTPUT.PUT_LINE('PLEASE RE-ENTER CLASS ID AND STUDENT ID AS CLASS OR STUDENT IS NOT VALID.');
    WHEN VALID_STU THEN
      CLOSE DUMMY_CURSOR;
      DBMS_OUTPUT.PUT_LINE('STUDENT CHOOSE SUCCEFULLY!');
    WHEN MUTATING_TABLE THEN
      NULL;
  END;
  /

  Just copy and paste on it and try to run next:
  UPDATE CLASS
  SET SCHOSEN = 3
  WHERE CID = 1;
  Clearly, you can't student who is 3 as to Member of class 1. Please help me. Thank you.
  
  Published by: 991096 on March 1st, 2013 02:36
  
  Published by: 991096 on March 1st, 2013 03:03
  
  Published by: 991096 on March 1st, 2013 03:11

  Hello

  991096 wrote:
  1. the purpose of this trigger is to check when to choose a student going to match, this student has in his class where it belongs to. Then, when I try to choose 3 student-member of correspondence of class 1, should give me "PLEASE RE-ENTER ID AND STUDENT ID AS CLASS or STUDENT not IS NOT VALID."

  Then do something like this:

  CREATE OR REPLACE TRIGGER CHECK_SCHOSEN
  BEFORE INSERT OR UPDATE OF SCHOSEN ON CLASS
  FOR EACH ROW WHEN (NEW.SCHOSEN IS NOT NULL)
  DECLARE
      sid_found     stu.sid%TYPE;
  BEGIN
      dbms_output.put_line (:NEW.schosen || ' = schosen entering check_schosen');             SELECT  sid
           INTO    sid_found
       FROM      stu
       WHERE     sid     = :NEW.schosen
       AND     cid     = :NEW.cid
       AND     ROWNUM     = 1     -- to avoid TOO_MANY_ROWS
       ;
  EXCEPTION
      WHEN  NO_DATA_FOUND
      THEN
       RAISE_APPLICATION_ERROR ( -20000
                      , 'Please re-enter class id and student id as class ('
                        || :NEW.cid
                        || ') or student ('
                        || :NEW.schosen
                        || ') is not valid.'
                      );
  end;
  /
  

  DBMS_OUTPUT creates only a message. The message may not be displayed, and if this is the case, then the user cannot see it. The DML will still take place.
  I used instead, RAISE_APPLICATION_ERROR to keep the DML does not happen. It displays a message like

  ORA-20000: Please re-enter class id and student id as class (1) or student (3) is not valid.
  

  ' 2 ' game ' means ' an official competition in which two several people or teams competing.

  What individuals or teams are competing in this case?
  In any case, the question wasn't 'that 'game' means', but

  Frank Kulash wrote:
  What do you mean when you say "going to match?

  I think that now you're saying that the new values of (class.cid, class.schosen) must be equal to (or "fit") some existing (stu.cid, stu.sid).

  3. thanks for your tip, I learned how to use '{code} '.

  4. it's really goes with the exception of MUTATING_TABLE. So, how do to fix the trigger to show me INVALID_STU EXCEPTION when I try to choose a student does not belong
  a class?

  Don't refer to the table of class in the trigger, and the error table mutation occur. All the information you need are in the stu table, so there is no need to query the table of class, anyway.

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