Explain the (), TO_DATE (), () with examples TO_NUMBER TO_CHAR

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• Need help with this code to update the user interface example

  I'm triying to understand the differences between the three methods to manage UI interactions.
  I'm really confused with these three terms when triying them figure out in a real case.
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  These three concepts are very confusing for a lot from people so all explanatory source code
  describing their functions will be highly useful for everyone, I think.

  Thanks in advance!

  With respect to the effect, there is no difference between methods.  The difference is the way in which the result is achieved.  So we can't change the code to show you the difference.

  As we are unable to demonstrate the difference, you have to do with an explanation.  To understand the explanation, you'll need to understand the thread of events, so if you have not already, please consider this:

  http://supportforums.BlackBerry.com/T5/Java-development/what-is-the-event-thread/Ta-p/446865

  If the three options are differentiated by the processing order:

  (a) invokeLater executes the update on the thread of events.  The transformation takes place at a later stage and the code which is in order after the invokeLater will actually run before the code within the invokeLater.

  (b) invokeAndWait also manages the update on the thread of events, which means that all other events that await on the thread of events will be run before this code.  But any code after the invokeAndWait will not be executed.

  (c) the synchronized option, like invokeAndWait, runs the update of the UI before moving on to the following code.  The difference is that the code to run on the event Thread is not executed before code in the synchronized block.

  If this is meaningless, so that probably does not matter too much.  in general, you should use invokeLater, except if you need to update the user interface occur in the order with your background processing.  If so, use invokeAndWait. It has synced are very few occasions where you must use the block, and it should be very small updates to the user interface and you should understand the implications this could have on the wire events.

• concatinating the time with date...

  Hello
  I have the column in a table that store the time from 00:00 to 23:00 hr with a different interval for each item.
  I show this column with the current date time.
  for example:
  Table A:
  expected_time
  22:40
  23:00
  20 x 30
  01:20
  04:10
  04:40
  
  Table B:
  Article expected_dep
  XYZ
  ABC
  I want the query to insert into table B as sysdate expected_dep + the expected_time min value where to_char(sysdate,'hh24:mi) > present
  Assume that sysdate is 2012-12-08 and sys the time now is 23:25, then the expected_dep should be 2012-12-09 00:30.
  Can anyone help solve this query.
  Thanks in advance...

  Benz says:
  This is the output result you can see the time is ok, but the date is not correct.

  You must be more precise. What result do you expect? The way I understand your reqs is we find then next time sysdate in the table has. So if the current time is 02:01 next time nearest you to table a is 06:00. If you want to get the closest time to the current time any direction:

  update  b
    set expected_dep = (
                        with t1 as (
                                     select  expected_time - trunc(expected_time) d
                                       from  a
                                    union all
                                     select  1
                                       from  dual
                                   ),
                             t2 as (
                                    select  trunc(sysdate) + d expected_dep,
                                            row_number() over(order by abs(d - (sysdate - trunc(sysdate)))) r
                                      from  t1
                                   )
                        select  expected_dep
                          from  t2
                          where r = 1
                       )
  /
  

  And to imitate 2012-12-10 02:01:

  update  b
    set expected_dep = (
                        with t1 as (
                                     select  expected_time - trunc(expected_time) d
                                       from  a
                                    union all
                                     select  1
                                       from  dual
                                   ),
                             t2 as (
                                    select  trunc(to_date('2012-12-10 02:01','yyyy-mm-dd hh24:mi')) + d expected_dep,
                                            row_number() over(order by abs(d - (to_date('2012-12-10 02:01','yyyy-mm-dd hh24:mi') -
                                            trunc(to_date('2012-12-10 02:01','yyyy-mm-dd hh24:mi'))))) r
                                      from  t1
                                   )
                        select  expected_dep
                          from  t2
                          where r = 1
                       )
  /
  
  4 rows updated.
  
  SQL> select  *
    2    from  b
    3  /
  
  ITEM       EXPECTED_DEP
  ---------- -------------------
  xyz        12/10/2012 02:00:00
  abc        12/10/2012 02:00:00
  def        12/10/2012 02:00:00
  ghi        12/10/2012 02:00:00
  
  SQL> 
  

  SY.

• ORA-06502 use TO_NUMBER TO_CHAR

  Hello
  Oracle Database 10g 10.2.0.5.0.
  
  I have the error in this code:

  nSuper_ NUMBER(6,2);
  ...
  dbms_output.put_line('Super: ' ||  TO_NUMBER(nSuper_,'FM9G990D90'));
  ...

  I have to use "TO_CHAR"... but my test is not failure, why? :

  --a)
  SET SERVEROUTPUT ON
  DECLARE
    nSuper_ NUMBER(6,2);
  BEGIN
    nSuper_ := 666.12;
    dbms_output.put_line('Super: ' ||  TO_NUMBER(nSuper_,'FM9G990D90'));
  
  END;
  /
  Super: 666,12
  
  
  --b)
  SET SERVEROUTPUT ON
  DECLARE
    nSuper_ NUMBER(6,2);
  BEGIN
    nSuper_ := 6666.12;
    dbms_output.put_line('Super: ' ||  TO_NUMBER(nSuper_,'FM9G990D90'));
  
  END;
  /
  DECLARE
  *
  ERROR en línea 1:
  ORA-06502: PL/SQL: error  numérico o de valor
  ORA-06512: en línea 5
  
  --c)
  SET SERVEROUTPUT ON
  DECLARE
    nSuper_ NUMBER(6,2);
  BEGIN
    nSuper_ := 6666.12;
    dbms_output.put_line('Super: ' ||  TO_CHAR(nSuper_,'FM9G990D90'));
  
  END;
  /
  Super: 6.666,12

  Why 'a' step missed and 'b' in case of failure?

  Hello

  jortri wrote:
  Why 'a' step missed and 'b' in case of failure?

  Because Oracle RDBMS is (too) soft on you for the conversion of 'simple' like that (but that does not mean that you will get errors...).

  To_number function takes as input a string.
  You send her a number, then Oracle does this: + "Ok this guy is sending a number in a TO_NUMBER function when it must be a string, we will do an implicit conversion for him in a transparent way" +. "
  In fact, your to_number (my_number_variable, 'FM9G990D90') becomes this:

  to_number( to_char(my_number_variable) ,'FM9G990D90')
  

  But, as you can see, the function to_char is not given any format, so that it uses your default session, which might be a different way to the mask you provide to to_number function.

  Please run this to understand what your failure to_number function receives as input:

  select 6666.12 number_implicitly_converted from dual;
  

  By default, on my computer it shows this:

  Scott@my11g SQL>select 6666.12 number_implicitly_converted from dual;
  
  NUMBER_IMPLICITLY_CONVERTED
  ---------------------------
                      6666.12
  

  Now, if I use it as input of your with your format mask to_number function:

  Scott@my11g SQL>select TO_NUMBER('6666.12','FM9G990D90') back_to_number from dual;
  select TO_NUMBER('6666.12','FM9G990D90') back_to_number from dual
                   *
  ERROR at line 1:
  ORA-01722: invalid number
  

  Tadammm!

  Conclusion: Not to spoil use to_number/to_char/to_date functions.
  :-)