Biginner's question about catch statement

hi im just a biginner
normally u guys write catch statement like
catch (FileNotFouldException exception)
System.out.println (exception);
something like that . but what is the exception here
is it object name? or class name or what
i mean the word exception after FileNotFoundException
i just don't understand

It's the type of the exception to which the catch block should apply.
You could have this:
try {
// stuff
} catch (FileNotFoundException fnfe) {
fnfe.printStackTrace();
} catch (IOException ioe) {
ioe..printStackTrace();
} catch (NumberFormatException nfe) {
nfe.printStackTrace();
} catch (Exception x) {
ex..printStackTrace();
}Note that FNFE extends IOE, so if the IOE is caught first, the FNFE would be caught in that block too. That's why you catch the general Exception last - if you do it at all.

Similar Messages

Question about delete statement

I have question about delete statement...
i am performing some simple delete statement against one table..but its taking so long..How can we check whether particular delete statements actually deleting records or not..?

Is the associated select-statement returning rows or not?
If yes -> delete is deleting
If no -> delete is just using CPU-cycles
To tune the delete-statement, you have to tune the corresponding select-statement. To tune the select-statement, you want to read the thread When your query takes too long ...

Question about 'write' statement

Hi,
A question on write statement.
I have a internal table itab which has field var. I am looping at this itab and writing horizontal heading output like below.
example on the output heading:
(3 spaces) itab-var (20 spaces) itab-var (20 spaces) itab-var.
the coding is:
loop at itab.
write: 3 itab-var.
endloop.
I want to increase the space by 20 for every loop. How to increase this 3 by 20? Can we accomplish this way?
Thank you for your time.

hi krishen,
just add 20 inside the loop , so that after every loop its value increases by 20
for example:
data: v type i.
v=3.
do 3 times.
write: at v(20).
v=v+20.
end do.
hope it will help you
regards
Rahul sharma
Edited by: RAHUL SHARMA on Sep 4, 2008 7:47 AM

A question About SUBMIT statement

Hi,
By SUBMIT statement, i can trigger another report. If the called report runs into dump, how can i detech/catch the dump in the calling report? I tested. It seems impossible to catch the dump. The calling report will also dump.
My question is, if the called report runs into dump, how to detect the dump and avoid dump in calling report?
Thanks in advance,
Best Regards, Johnney.

hi
you can catch this kind of error or exeption from the respective report
then pass this error or exeception to the calling report
go through the example I am giving , ti have done it like this only
SUBMIT zgurep03 AND RETURN WITH SELECTION-TABLE li_seltab .
then in the called reprot
*Check ledger
SELECT SINGLE * FROM t881 WHERE rldnr = p_rldnr.
IF sy-subrc NE 0.
    SET CURSOR FIELD 'P_RLDNR'.
     MESSAGE e448 WITH p_rldnr
      MESSAGE e446 INTO lv_text .
      lv_type = 'E'.
Capturing the error messages.
EXPORT lv_text TO MEMORY ID 'TX'(004).
EXPORT lv_type TO MEMORY ID 'TP'(005).
in calling report
IMPORT gv_type1 TO gv_type FROM MEMORY ID 'TP'.
IMPORT gv_text1 TO gv_text FROM MEMORY ID 'TX'.
preparing error message in the callge report for the calling report
PERFORM prepare_message
        USING sy-msgid
              lv_msgno
              lv_msgv1
              lv_msgv2
              lv_msgv3
              lv_msgv4
        CHANGING gv_text.
preparing error message
FORM prepare_message USING    p_sy_msgid
                               p_sy_msgno
                               p_sy_msgv1
                               p_sy_msgv2
                               p_sy_msgv3
                               p_sy_msgv4
                      CHANGING p_gv_text.
CALL FUNCTION 'FORMAT_MESSAGE'
    EXPORTING
      id        = p_sy_msgid
      lang      = 'EN'
      no        = p_sy_msgno
      v1        = p_sy_msgv1
      v2        = p_sy_msgv2
      v3        = p_sy_msgv3
      v4        = p_sy_msgv4
    IMPORTING
      msg       = gv_text
    EXCEPTIONS
      not_found = 1
      OTHERS    = 2.
IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
            WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
I guess this will solve your problem
Regards
Prashant

Beginner question about prepared statements...PLEASE help! :-)

First let me say thanks for the assistance. This is probably really easy to do, but I'm new to JSP and can't seem to figure it out.
I want to dynamically populate a table that shows whether a particular person has an appointment at a given date and time with a user. To do this, I want to query the MySQL database for the lastname of the person with the appointment that occurs with the user at the year, month, date, and time, in question.
THE CODE BELOW DOESN'T WORK (obviously) BUT SOMEWHAT ILLUSTRATES WHAT I'M TRYING TO ACCOMPLISH:
<%
Driver DriverTestRecordSet = (Driver)Class.forName(MM_website_DRIVER).newInstance();
Connection ConnTestRecordSet = DriverManager.getConnection(MM_website_STRING,MM_website_USERNAME,MM_website_PASSWORD);
PreparedStatement StatementTestRecordSet = ConnTestRecordSet.prepareStatement("SELECT lastname FROM appts_pid1 WHERE user_id='<%=(((Recordset1_data = Recordset1.getObject(user_id))==null || Recordset1.wasNull())?"":Recordset1_data)%>' AND year='<%= yy %>' AND month='<%= months[mm] %>' AND date='<%= dates[dd] %>' AND appttime='16:15:00'");
ResultSet TestRecordSet = StatementTestRecordSet.executeQuery();
boolean TestRecordSet_isEmpty = !TestRecordSet.next();
boolean TestRecordSet_hasData = !TestRecordSet_isEmpty;
Object TestRecordSet_data;
int TestRecordSet_numRows = 0;
%>
The real problem comes in the prepared statement portion. If I build the prepared statement with static values like below, EVERYTHING WORKS GREAT:
PreparedStatement StatementTestRecordSet = ConnTestRecordSet.prepareStatement("SELECT lastname FROM appts_pid1 WHERE user_id='1' AND year='2002' AND month='October' AND date='31' AND appttime='16:15:00'");
But when I try to use dynamic values, everything falls apart. It's not that the values aren't defined, I use the user_id, year <%= yy %>, month <%= months[mm] %>, etc. elsewhere on the page with no problems. It's just that I can't figure out how to use these dynamic values within the prepared statement.
Thanks for reading this far and thanks in advance for the help!!!!

Hi PhineasGage
You are little bit wrong in your
your preparedStatement.
Expression tag within scriptlet tag is invalid.
Whenever you are appending the statement with
expression tag, append it with "+" and remove
expression tag.
Hopefully it will work
ThanksThanks for the response!
I know that the expression tag within scriptlet tag is invalid. I just need a workaround for what I want to do.
I'm unclear what you mean by "Whenever you are appending the statement with expression tag, append it with a "+" and remove expression tag".
Could you give an example?
In the meantime, I've been trying to digest the docs on prepared statements and have changed the code to look like:
PreparedStatement StatementTestRecordSet = ConnTestRecordSet.prepareStatement("SELECT lastname FROM appts_pid1 WHERE user_id= ? AND year= ? AND month= ? AND date= ? AND appttime='13:15:00'");
StatementTestRecordSet.setInt(1,1);
StatementTestRecordSet.setInt(2,2002);
StatementTestRecordSet.setString(3,"October");
StatementTestRecordSet.setInt(4,31);
Again, WITH THE STATIC VALUES, THIS WORKS FINE...but when I try to use expressions or variables like below, things don't work:
StatementTestRecordSet.setInt(2,<%= yy %>);
Obviously, I'm doing something wrong, but there has to be a way to use variables within the prepared statement.
ALSO, the values are being passed to this page via URL in the form:
samplepage?user_id=1&year=2002&month=October&date=31
Based upon this information, is there another way (outside of stored procedures in the db) to do what I want to do? I'm open to ideas.

Question about call statement in trigger

I faced a question in written exam.
A CALL statement inside a trigger allow us to call
a)package
b)procedure
c)function
d)another trigger
Can anyone give me answer with reason?
I used CALL statement inside trigger but not allowing to use it. Might be earlier in oracle CALL statement we can use..its only a guess so I am asking in forum..
plz guide me..
rgds,
pc

You can use CALL in a trigger without resorting to EXECUTE IMMEDIATE
SQL> create table t1 (
2    col1 number
3 );
Table created.
SQL> create procedure t1_proc
2 as
3 begin
4    dbms_output.put_line( 'In T1_PROC' );
5 end;
6 /
Procedure created.
SQL> ed
Wrote file afiedt.buf
1 create trigger trg_t1
2    before insert on t1
3    for each row
4* call t1_proc
5 /
Trigger created.
SQL> set serveroutput on;
SQL> insert into t1 values( 1 );
In T1_PROC
1 row created.I can't think of any reason that you'd actually intentionally structure your code this way in this day and age because it would be rather likely to cause confusion for whoever had to support this in the future. But it is valid syntax that probably made sense back in Oracle 5.
Justin

Question about sql statement

Hi expert,
I have following sql statement, function 'hiroc_get_delta_amount1' and 'hiroc_get_delta_amount2' are separately used in select and where subclause. these two function are exactly same, except that there is a inserting log statement inside. for function 'hiroc_get_delta_amount1' , logs are supposed to write into log table1, whereas for function 'hiroc_get_delta_amount2' , logs are supposed to write into log table2. after running this sql, I got data loaded into log table2, however, there is no data loaded into log table1.
could you please tell me why there is no data in log table2 for function
1. sql statement;
select
pp.policy_premium_pk,
pp.policy_fk,
pp.policy_term_fk,
pp.risk_fk,
pp.coverage_fk,
pp.transaction_log_fk,
pp.coverage_component_code,
hiroc_rpt_user.hiroc_get_delta_amount1(pp.policy_fk, pp.policy_term_fk, pp.risk_fk, pp.coverage_fk, pp.transaction_log_fk, pp.coverage_component_code),
pp.rate_period_from_date
from PRODBKUPDW_MART.rmv_policy_premium pp
where pp.rate_period_type_code = 'TERM_COVG'
and pp.coverage_component_code 'NETPREM'
and hiroc_rpt_user.hiroc_get_delta_amount2(pp.policy_fk, pp.policy_term_fk, pp.risk_fk, pp.coverage_fk, pp.transaction_log_fk, pp.coverage_component_code) != 0
group by pp.policy_premium_pk,
pp.policy_premium_pk,
pp.policy_fk,
pp.policy_term_fk,
pp.risk_fk,
pp.coverage_fk,
pp.transaction_log_fk,
pp.coverage_component_code,
pp.rate_period_from_date;
2. log inserting statement used for both functions:
(1) function 'hiroc_get_delta_amount1'
insert into HIROC_RPT_USER.LOG_TEST1 values (v_start, sysdate,
p_policy_fk,p_policy_term_history_fk,p_risk_fk,p_coverage_fk,p_transaction_log_fk,p_comp_code);
COMMIT;
(2) function 'HIROC_GET_DELTA_AMOUNT_1'
insert into HIROC_RPT_USER.LOG_ZB_TEST_1 values (v_start, sysdate,
p_policy_fk,p_policy_term_history_fk,p_risk_fk,p_coverage_fk,p_transaction_log_fk,p_comp_code);
COMMIT;

Are your functions using autonomous transactions?
We also need more information about the log tables etc. as we cannot tell what the problem would be from just that query, and no data.

Question about some statement

Hello Gurus,
       as for a statement "The MBW job BI_BTCH__FX_PAYMENT_DATA=X10M and itu2019s child job ended with completed Abnormally status.", I have some question as follows:
     (1) where does they check out this job " BI_BTCH__FX_PAYMENT_DATA=X10M " ? what do that "=" and "X10M" and "BI_BTCH__FX_PAYMENT_DATA"   mean ?
    (2) how does " MBW job BI_BTCH__FX_PAYMENT_DATA=X10M " match some BW object?
    (3) what is itu2019s child job ?
Ma

Is the associated select-statement returning rows or not?
If yes -> delete is deleting
If no -> delete is just using CPU-cycles
To tune the delete-statement, you have to tune the corresponding select-statement. To tune the select-statement, you want to read the thread When your query takes too long ...

Question about Merge Statement

Is it possible to use a CASE statement inside the update clause of a merge statement? Also what about a function?
I have a string (In Source) that needs to be split into multiple columns (In Target) depending on values in other columns (In Source).
I am on 11iR1

Hi Chris,
You can take a look at the below examples :
SQL>create table t_test
col1,col2,col3
) as
select 1,2,3 from dual union all
select 2,3,4 from dual union all
select 3,4,2 from dual union all
select 9,10,12 from dual union all
select 11,23,43 from dual
create table succeeded.
SQL>select * from t_test;
COL1                   COL2                   COL3
1                      2                      3
2                      3                      4
3                      4                      2
9                      10                     12
11                     23                     43
SQL>merge INTO t_test t_t USING
SELECT
    1 AS col1
FROM
    dual
) d_d
ON
(d_d.col1 = t_t.col1)
WHEN matched THEN
UPDATE set
    col2 = (
      CASE
        WHEN d_d.col1 = 1
        THEN 123
        ELSE -1
      END );
1 rows merged
SQL>select * from t_test;
COL1                   COL2                   COL3
1                      123                    3
2                      3                      4
3                      4                      2
9                      10                     12
11                     23                     43

Question about conversational state of Stateless bean....

Hello all,
I have a simple stateless bean which parses an XML file and stores the xml content as an list of 2-D arrays in member variables. Here is quick look at design...
import javax.ejb.Stateless;
// included other libraries
import java.util.List;
import java.util.ArrayList;
@Stateless
public class XMLParseBean implements XMLParseBeanInterface {
    public List<String> strParameters;
    public List<String> getStrParameters() {
        return strParameters;
    private void setStrParameters(List<String> strParameters) {
        this.strParameters = strParameters;
    public void parseXML(String strFileName) {
           /* Open the XML file and do initializations for xml parsing here
            setStrParameters(visitNode(doc.getDocumentElement()));
    private List<String> visitNode(Element thisNode) {
            /* Parse the XML here */
            return strNodes; // return the node names and their values
}My question is : if I inject this bean in another bean, call the method for parsing XML and then call the getParameter method to access the value of member variable, will it work.
I mean since I am using stateless bean, does the conversation state end when the parseXML method ends?

sir_edward wrote:
Hi vikram8jp,
The session of an stateless bean ends after a method call. If you call a method of your bean, the bean will forget all attributes when the method ends. If you want to save attributes, you have to use a stateful bean.
Regards
Sir EdwardHello Sir Edward,
That answers my query.

Newbie question about switch statement

Lets say you have a loop and inside the loop you have a switch statement, how do you BREAK out of the outer loop?
for (i=0....) {
switch {
case 11:
.... some stuff
break; <==== HOW DO I BREAK OUT OF THE for loop here?

In standard C and standard C++ the break statement terminates the nearest enclosing loop and only that loop; i.e. control transfers to the first statement following the loop. I think there are C or C++ extensions that allow loop tags which may be used with a break to specify which loop to drop through, but I don't think these are supported by gcc, and they would certainly be very non-portable.
There are several common ways to drop out of one or more outer loops. In many cases, there's nothing else in the loop following the switch so you can simply write
switch (condition) {
default:
case 0:
break;
// other case statements here
break;
Else you can declare a loop control var and use the continue statement like this:
for (i=0; i<jMax && !bDone; i++) {
switch (condition) {
default:
case 0:
bDone++; continue;
// other case statements
If you need to escape several loops and/or don't want to use loop control vars, you might consider structuring the code so you can use return to terminate the entire function. In the worst case of a very complex structure that you don't know how to simplify with a helper function, you can always resort to a goto:
switch (condition) {
default:
case 0:
goto escape;
// other case statements here
// remainder of code inside nested loops here
escape: <first statement following the outermost loop>;
Note that the statement following the escape label is always executed; i.e. when execution skips the goto it's as if the statement following escape was unlabeled. Use goto sparingly of course, since it's an artifact of unstructured programming. But when you really need a goto, it can make your code much easier to maintain.

Hi Experts, a question about Account statement(sapscript)?

Hi Experts,
I am working on Account statement, I want to know what is the field for opening balance on the first date of the month, I have a structure(RF140) to use and I found there is final balance(rf140-datu2, rf140-saldo) used in the form, can anyone tell me what is opening balance and final balance? what are the corresponding fields? thank you in advance, thanks.
Kind regards
Dawson
Edited by: dawson wang on Jun 22, 2009 7:00 AM

Hi,
U can go to SE11 & give structure name RF140 & press display button. it displays all the fields in struture...
FYI...field name for Open balance is 'OPBETRAG' & for Final Balance is 'GSALDD'.
Hope it helps!!
Rgds,
Pavan

Question about network statement in OSPF and BGP

The network statements in OSPF and BGP can be used to advertise networks. But I'm not clear under what circumstances would make more sense to use network statements to advertise a network than by using other methods to have the network learned by other routers.
Here is an example: assume I'm running BGP on router A. I want to advertise network 10.1.1.0/24 to other BGP peers. I have a OSPF route for this network. I can do 2 things: one is to use "network 10.1.1.0 mask 255.255.255.0", the other is to do "redistribute OSPF ... route-map OSPF-INTO-BGP", and create a prefix list to permit 10.1.1.0/24.
Both would work to have this network learned by other BGP peers. But which is better for what purpose?
Thanks a lot
Gary

Hi Gary,
There is one little difference between the use of the two approaches - the route injected into BGP by using a network statement will carry an Origin attribute of IGP, whereas the route injected using redistribution will have an Origin attribute of Incomplete. Now, that is not a huge issue since you can always change that whatever value you desire both with the use of the network statement and redistribution. The important thing, however, is that in the BGP best path selection process, the Origin attribute comparison is fairly high up and will prefer a route with the attribute of IGP.
Apart from that, there is absolutely no difference between using the network statement and using redistribution with a route-map that matches exactly on the same route that you would have specified with the network statement.
I guess one advantage of using the redistribute approach is that it does not clutter up the BGP config. If you wish to add more routes, you simply add them to the prefix list so that you don't really touch the BGP config portion at all..
Hope that helps - pls do remember to rate posts that help.
Paresh

Question about synchronize() statement and thread scheduling?

I have threads accessing a shared LinkedList in the main thread. I made use of the Collections.synchronizedList() to avoid concurrent modifications. one of the threads is a timer thread and it has a priority of 5 and the other threads are message reception threads and i made them of a lower priority just to allow the timer thread to be executed on time. According to the javaAPI, all iterations on the synchronized list should be done using synchronized(synchronizedListRef){} and this is what i do,
The problem is even after setting the priority of the reception threads lower than the timer thread, the reception threads are sometimes executed more than once and the timer thread is delayed. Lets assume the situation where the timer reaches the point where it has to acquire the lock (the synchronized statement) and it discovers that the lock is already taken and it cant access the list because the other thread (of a lower priority) is iterating over it. shouldnt the higherpriority thread be executed after that the reception thread (that is blocking the timer thread) finishes its execution and release the lock (even if there are other reception thread waiting)??
does the priority play a role when a thread is blocked?

Asady wrote:
I have threads accessing a shared LinkedList in the main thread. I made use of the Collections.synchronizedList() to avoid concurrent modifications. Make sure you explicitly sync around all iterations. Just using Collections.sync is not enough.
The problem is even after setting the priority of the reception threads lower than the timer thread, the reception threads are sometimes executed more than once and the timer thread is delayed.There's no guarantee as to how priority will be interpreted. The scheduler implementation is free to do pretty much anything.
As for how to solve your problem, you might want to look at java.util.concurrent.*, e.g. PriorityQueue. If the classes there don't give you just what you need, you may be able to build on them, or at least get ideas from them. Bottom line is that if you want a specific scheduling algorithm, you'll have to implement it yourself, since Threads' priority semantics are only very loosely specified by the JLS.

Question about dml statement processing

Hi,
If we have a tabular block (with multiple records displayed), and initially the corresponding table does not contain any records, and we start the form then enter two records and we issue Ctrl+S (commit), then when the commit is issued? At the end (so two records commited once), or after every insert?
Same question If we issue a new insert, and we update another record. So first the record is inserted, then the update is made, and at the end commit?
Thanks.

Hello,
The commit is done when every database events are applied (insert, update, delete).
Francois

Biginner's question about catch statement

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