Question

casting....

Asked by: udir

Hi,
I select rows from a table in Oracle. In the table there is a date field.
I call that field (in the select sentence like that :
   string s = @"select DISTINCT USERID, USERNAME, TO_CHAR(DATEADD, 'dd/mm/yyyy') from USERS
    .....here i call a dataReader for all the rows....

Now, i need to call a function which get a date (as a string), like :
     UserReg(Convert.ToInt32(dr["USERID"]), Convert.Tostring(dr["USERNAME"]), Convert.Tostring(dr["DATEADD"]))

But i get an error at the DATEADD.
Whats wrong with the casting?
(If it is possible, to call the DATEADD from the Oracle like that - TO_STRING(DATEADD, 'dd/mm/yyyy')
it's even better, but i don't think it works.)
Thanks

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Asked On
2007-05-21 at 22:52:52ID22586408
Tags

oracle

,

dateadd

,

to_string

Topics

Oracle 9.x

,

Oracle Database

,

C# Programming Language

Participating Experts
1
Points
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Comments
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Answers

 

by: schwertnerPosted on 2007-05-22 at 00:37:12ID: 19132207

Oracle automatically converts dates to strings, but without the time component:
SQL> select sysdate from dual;

SYSDATE
---------
22-MAY-07

SQL> select TO_CHAR(sysdate,'dd-mm-yyyy hh:mi:ss') from dual;

TO_CHAR(SYSDATE,'DD
-------------------
22-05-2007 10:52:59

SQL>

 

by: udirPosted on 2007-05-22 at 01:01:33ID: 19132265

Hi,
Thanks for the reply.
I didn't understand what you ment :

TO_CHAR(SYSDATE,'DD
-------------------
22-05-2007 10:52:59

If i write - select.....DATEADD FROM....   without  the  TO_CHAR(sysdate,'dd-mm-yyyy hh:mi:ss') from dual;
I don't get DISTINCT rows which mean that the  select statment
see  15/05/2007 09:56:34 and
        15/05/2007 09:56:45  
as different rows. (this is where my problem beggins - if there are 2 or more rows with the same date (even if there is a different hour, then the select statment must take only 1 row. after that i need to cast it to string.)
but if i wrote - TO_CHAR(DATEADD, 'dd/mm/yyyy') from USERS
it works fine but i can't cast it to string in my code.
Maybe do you have some idea? (maybe i should change the select statment....)

 

by: udirPosted on 2007-05-22 at 01:24:03ID: 19132335

There is also a trigger which add Date to each new row.
CREATE OR REPLACE
TRIGGER T_ADD_DATE BEFORE INSERT OR UPDATE OF DATEADD ON PAY_RIZA_APPROVE
FOR EACH ROW
begin
  :NEW.DATEADD := SYSDATE;
  :NEW.SENT := 0;
end;

Maybe it can be solved from here? (i mean add the new date in a short format, so i will not have to deal with it it the code)???

 

by: schwertnerPosted on 2007-05-22 at 01:46:31ID: 19132387

There is no short or full format of a Date column in Oracle.

Oracle saves dates with time component.

But you can display the time component or to hide it.

Write:

select  TO_CHAR(DATEADD, 'dd-mm-yyyy hh:mi:ss') FROM....  

select distinct TO_CHAR(DATEADD, 'dd-mm-yyyy hh:mi:ss') FROM....  

In this case the time component will possibly prevent to have 2 or more rows equal

 

by: udirPosted on 2007-05-22 at 02:10:39ID: 19132478

Ok thanks

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