JDBC: Closing Connection does it close statement and resultset

In my application I am facing ORA-0100 Maximum open cursors exceeded problem. We are executing quite a few queries and stored procedures before we close the connection object. But in few places statements and resultsets are not closed. Can these be a problem? Shouldn't they be automatically closed when the connection is closed?
We are executing this block of code in a loop.

in few places statements and
resultsets are not closed. Can these be a problem?Yes.

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Closing Statements and ResultSets

I just recently realized that you need to close Statements and ResultSets in order to avoid getting the "Too many cursors"-message.
My question is:
Do you need to close both Statements and ResultSets?
- not that it's a problem...
if so:
Does it matter which one you close first?

I usually place the stmt.close() code in my finally block, to ensure that the statement gets closed, even if a SQLException occurs during the query/update. The ResultSet does not explicitly have to be closed, ... it is automatically closed when the Statement is closed, or if a new query is run on the same statement.

Statement and ResultSet Interface type of Object

Hi,
Can any one explains me where exactly (in which Class) the implementation of the Statement and ResultSet Interface type of Object Instance be created
Regards
Krishna

I dont really understand what you are trying to ask but:
Your JDBC driver has concrete implementations of Statement and Resultset. If you want to know what classes are being used try something like:Connection con = ??;
Statement st = con.createStatement();
ResultSet rs = st.executeQuery( "???" );
System.out.println( "Connection class: " + con.getClass().getName() );
System.out.println( "Statement class: " + st.getClass().getName() );
System.out.println( "ResultSet class: " + rs.getClass().getName() );

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Pooling Prepared Statement and Resultset

Is their any mechanism in Weblogic by which we can pool prepared statements and
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Yes you can cache prepared statements. The connection pool will
automatically cache the prepared statements (10 prepared statement was the
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imp prepared statements.). When you reuse the prepared statement the
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But you cannot have multiple resultsets open for the same statement object.
You can have cache rows though.
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http://search.bea.com/weblogic/gonews/
sree
"hogan" <[email protected]> wrote in message
news:3bd9cf88$[email protected]..
>
Is their any mechanism in Weblogic by which we can pool preparedstatements and
resultset.

Urgent, please help-- connection does not close

Hi,
We are using Txdatasource, Oracle thin driver in WLS6.1 sp2. The problem we have
is that we open connection and pass the connection as parameter to third part
tool to generate report, but the tool doesn't close connection after finish, then
the connection is left never being closed, and our connections in connection pool
soon used up, have to restart weblogic to reset. the connection pool is set to
allow shrink, but those connections are not recycled. Please help, how do we somehow
set up WLS or database so that if a connection is not used for some time system
automatically close connection? Thank you very much. your help is greatly appreciated

Hi Chun,
I don't think it's possible whithout changing code. Primaryly it's because
it hard to tell whether connection is abandoned or still in use. So you have
to make changes in your code.
Regards,
Slava Imeshev
"Chun" <[email protected]> wrote in message
news:[email protected]...
>
Hi,
Thanks for reply. The reporting tool is supposed to close connection butit didn't.
And now we need some quick fix on it without touching code.
Seems like the used connection can not be garbage collected because theconnection
I used yesterday is still not recycled today. ( I monitor JDBC in WebLogicConsole,
the "connections" column on "Monitoring" didn't change). No matter how bigI set
the maximum number of connections, the connections will use up finally andwe
have to restart WebLogic server.
Is there any way to make connection drop after some time?
"Slava Imeshev" <[email protected]> wrote:
Hi Chun,
"Chun" <[email protected]> wrote in message
news:[email protected]...
We are using Txdatasource, Oracle thin driver in WLS6.1 sp2. The
problem
we have
is that we open connection and pass the connection as parameter tothird
part
tool to generate report, but the tool doesn't close connection afterfinish, then
the connection is left never being closed, and our connections inconnection pool
What prevents you from closing connection after control is returned
back from the reporting tool?
soon used up, have to restart weblogic to reset. the connection poolis
set to
allow shrink, but those connections are not recycled. Please help,how do
we somehow
set up WLS or database so that if a connection is not used for sometime
system
automatically close connection?Weblogic closes connections that were not returned to the pool when
they are GC-ed. Yet you should not relay on this feature as by the
moment a connection is closed the pool maybe already used up.
The other option I was thinking about is that it's possible to size
of the pool you use is too small for the application. Did you try to
increase (let say double) size of the pool?
FYI having shrinking and refresh enabled doesn't make much
sense in most of the cases. You can improve performance and
stability of your application by setting initial number of connections
to max and setting refresh period to let say 99999.
Hope this helps,
Regards,
Slava Imeshev

Close statement and than rollback ?

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statement
execute
close statement
statement
execute
close statement
commit or ropllback

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JDBC "Closed Connection" Problem

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What effect If not Close statement or resultSet

Hi
i in my project somewhere i did not close these thing is it necessary
If am not close any resultSet or statement/Preparedstatement
what problem can arise, will it is cause to make database conjection
is it automatically close
Thanks

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Just closing connection enough?

Hi friends..This is my first post...I am a newbie Java Developer..Okay Here goes
I have just made a LAN based Java application using Swing,JDBC with backend as MS-Access..The backend is on a shared network drive..
The application is distributed as jar files on the LAN PCs..
Everywhere I have connected to the database I have just closed the connection explicitly like this
con.close();
I do not close the associated resultset and statement explicitly
The specification says associated statements and resultsets close when you close
the connection,even if you don't explicitly close them
Also I am not using connection pool..its simple basic connection using DriverManager
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url = "jdbcdbcSN name";
String user = "";
String pw = "";
con = DriverManager.getConnection(url, user, pw);
Statement stmt = con.createStatement();
String select = "" ;
ResultSet rows = stmt.executeQuery(select);
Till now no performance problems..over 4K records have been added..
JVM is not exiting or anything..
On the net everyone says to explicitly close everything..but I did not know that
earlier..
My question is
Is closing just the connection enough..?
Is there any way I can check whether statements and resultsets have been implicitly closed?
Later on will it cause any performance problems or anything...?
Shud I change my code and add rs.close() and stmt.close() everywhere..?
If specification says everything closes on
closing connection why do ppl insist on closing everything explicitly..?
Or is this driver dependent..don't the drivers go through the specification..
My driver is the Sun JDBC ODBC bridge.....
There would be 8-10 users maximum at a time using the application concurrently...
Any help would be appreciated..Thanks in advance..

@jschell
Thanks for your help
I was running a few more tests..can you please explain the the following code...
Code
import java.sql.*;
import java.io.*;
class gc5test
public static void main(String args[])
Connection con = null;
long memoryBeforeSelects;
long memoryAfterSelects;
long memoryAfterConnectionClose;
try
PrintWriter pw= new PrintWriter("c:\\log1.txt");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url = "jdbc:odbc:pravahcon";
String user = "admin";
String pass = "ash123";
for(int i=1;i<=20;i++)
pw.println("Connection No"+i);
memoryBeforeSelects = Runtime.getRuntime().freeMemory();
pw.println("Free Memory before making connection " + memoryBeforeSelects / 1024 + " kB");
con = DriverManager.getConnection(url, user, pass);
Statement stmt = con.createStatement();
String select = "SELECT * FROM Users" ;
ResultSet rows = stmt.executeQuery(select);
memoryAfterSelects = Runtime.getRuntime().freeMemory();
pw.println("Free Memory after making connection " + memoryAfterSelects / 1024 + " kB");
rows.close();
stmt.close();
con.close();
memoryAfterConnectionClose = Runtime.getRuntime().freeMemory();
pw.println("Free Memory after closing connection " + memoryAfterConnectionClose / 1024 + " kB");
pw.close();
catch (ClassNotFoundException f)
System.out.println(f.getMessage());
System.exit(0);
catch (SQLException g)
System.out.println(g.getMessage());
System.exit(0);
catch (Exception e)
System.out.println(e.getMessage());
System.exit(0);
Output
Connection No1
Free Memory before making connection 4729 kB
Free Memory after making connection 4675 kB
Free Memory after closing connection 4675 kB
Connection No2
Free Memory before making connection 4675 kB
Free Memory after making connection 4638 kB
Free Memory after closing connection 4620 kB
Connection No3
Free Memory before making connection 4620 kB
Free Memory after making connection 4584 kB
Free Memory after closing connection 4584 kB
Connection No4
Free Memory before making connection 4584 kB
Free Memory after making connection 4548 kB
Free Memory after closing connection 4529 kB
Connection No5
Free Memory before making connection 4529 kB
Free Memory after making connection 4493 kB
Free Memory after closing connection 4493 kB
Connection No6
Free Memory before making connection 4493 kB
Free Memory after making connection 4457 kB
Free Memory after closing connection 4457 kB
Connection No7
Free Memory before making connection 4439 kB
Free Memory after making connection 4403 kB
Free Memory after closing connection 4403 kB
Connection No8
Free Memory before making connection 4403 kB
Free Memory after making connection 4367 kB
Free Memory after closing connection 4367 kB
Connection No9
Free Memory before making connection 4349 kB
Free Memory after making connection 4313 kB
Free Memory after closing connection 4313 kB
Connection No10
Free Memory before making connection 4313 kB
Free Memory after making connection 4277 kB
Free Memory after closing connection 4277 kB
Connection No11
Free Memory before making connection 4259 kB
Free Memory after making connection 4223 kB
Free Memory after closing connection 4223 kB
Connection No12
Free Memory before making connection 4223 kB
Free Memory after making connection 4187 kB
Free Memory after closing connection 4169 kB
Connection No13
Free Memory before making connection 4169 kB
Free Memory after making connection 4817 kB
Free Memory after closing connection 4800 kB
Connection No14
Free Memory before making connection 4800 kB
Free Memory after making connection 4766 kB
Free Memory after closing connection 4766 kB
Connection No15
Free Memory before making connection 4766 kB
Free Memory after making connection 4714 kB
Free Memory after closing connection 4714 kB
Connection No16
Free Memory before making connection 4714 kB
Free Memory after making connection 4678 kB
Free Memory after closing connection 4678 kB
Connection No17
Free Memory before making connection 4678 kB
Free Memory after making connection 4627 kB
Free Memory after closing connection 4627 kB
Connection No18
Free Memory before making connection 4627 kB
Free Memory after making connection 4592 kB
Free Memory after closing connection 4575 kB
Connection No19
Free Memory before making connection 4575 kB
Free Memory after making connection 4540 kB
Free Memory after closing connection 4540 kB
Connection No20
Free Memory before making connection 4540 kB
Free Memory after making connection 4489 kB
Free Memory after closing connection 4489 kB
The memory is not being freed immediately after closing connection explicitly in first 12 iterations..
In the first 12 iterations memory after making connection and memory after closing
connection are the same/or very less difference...
Only in the 13th iteration the memory increases from 4169 to 4817..
Why is this happening..?
I am closing everything explicitly..
Shouldn't the memory be reclaimed immediately..?
Insted it is happening later on..
Am I missing something here..?

JDBC: Closing Connection does it close statement and resultset

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