How do I know if my update didn't work because the record doesn't exist

I am updating a row in a table and I want to know if the update didn't work because the record doesn't exist. Is there any way of knowing this? I want to avoid doing a select first if at all possible. I am using sqlj with Oracle 9i on Linux and JDK 1.3.1.

I got it. So if anybody else needs to know this here it is.
import sqlj.runtime.ExecutionContext;
ExecutionContext ec = new ExecutionContext();
#sql [ec] {update statement};
if (ec.getUpdateCount() == 0){
throw new SQLException("No rows for update");

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How do I know if an update failed because the record doesn't exist

I am updating a row in a table and I want to know if the update didn't work because the record doesn't exist. Is there any way of knowing this? I want to avoid doing a select if at all possible. I am using sqlj with Oracle 9i on Linux and JDK 1.3.1.

...and I want to know if the update didn't work because the record doesn't exist. It is possible that you are looking at the problem wrong. An update doesn't 'fail' if there is nothing to update. So it works whether anything was updated or not. And so it might simply not be possible to see whether zero or more rows were updated. (Returning how many rows were updated might represent an enhancement rather than a necessity.)
I didn't find anything specifically that said this was or wasn't supported by briefly looking at the Oracle docs and searching google.
If nothing else you could always do a select first with the same where clause and then do the update if the select returns a non-empty set.

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1 ) I have query in which i have 3-4 tables but there multiple index on one column .
so how can i know which index will be used when executing the query ?
2) I have a query which ia taking too much time . how can i know which table is taking too much time ?
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Hi Jimmy,
Consider the below example
/* Formatted on 2011/02/04 21:59 (Formatter Plus v4.8.8) */
CREATE TABLE FIRST AS
SELECT * FROM all_objects;
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/* Formatted on 2011/02/04 21:59 (Formatter Plus v4.8.8) */
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| 1 | TABLE ACCESS BY INDEX ROWID| FIRST | 1 | 128 | 1 (0)| 00:00:01 |
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From this we can come to the conclusion that, whether to use one index or not by oracle
would also depend on the data which is present in the table. This has to be this way as
we see in the bind peeking, if oracle sticks to only one plan, say only use the full table
scan, it would be a performance hit when it searches for the second query ie where object_name
='emp';
2.
If we have a query like below.
select * from emp
where upper(ename) = upper(:p_ename);
Evenif we have the index on ename column, oracle wouldn't be able to use the index, as there is a function in the predicate column. If you need oracle to use the index, we need to create a function based index as below.
Create index idx_ename on emp(upper(ename));
Regards,
Cool

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How do I know if my update didn't work because the record doesn't exist

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