Is in ORACLE JDBC drivers connection pooling support

Hi All!
Can anybody give me information about subj?
Any information appreciated

<BLOCKQUOTE>quote:<HR>Originally posted by Mike:
Hi All!
Can anybody give me information about subj?
Any information appreciated<HR></BLOCKQUOTE>
Yes, Oracle JDBC drivers do support connection pooling. Download the latest drivers to get samples and refer doc for more details.

Similar Messages

Oracle JDBC Drivers 8.1.6.0.1

In the readme file of Oracle JDBC drivers 8.1.6.0.1 (http://technet.oracle.com/software/tech/java/sqlj_jdbc/files/Readme_01.txt)
it mentioned that it supports "connection pooling" and "distributed transactions".
Later on in the same file under "Oracle JDBC Connection Caching", it says it "facilitates" users in their own connection pooling. Does this mean there is not complete implementation of connection pooling in the driver and users has to do the work themselves?
null

<BLOCKQUOTE>quote:<HR>Originally posted by JDBC_TX ():
In the readme file of Oracle JDBC drivers 8.1.6.0.1 (http://technet.oracle.com/software/tech/java/sqlj_jdbc/files/Readme_01.txt)
it mentioned that it supports "distributed transactions".
As I understand, JDBC transaction is connection based and uses Oracle internal transaction manager. In order to do "distributed transactions", I must have at least two connections open at the same time each to its own database instance. How does the two connections coordinate the transactions? I thought in order to support "distributed transactions", one has to build a higher layer to encapsulate the two connections and therefore coordinate the distributed transactions. Any examples will be welcome.<HR></BLOCKQUOTE>
The two branches of the transaction are coordinated using 2-phase commit.
For samples look under
$ORACLE_HOME/jdbc/demo/samples/oci8/jdbc20-samples/
null

A very surprise problem about JDBC and connection pool

I occur a very problem about JDBC and connection pool on Weblogic Platform
8.1.
There is a table in Oracle
Table
Name: t1
id varchar2(5);
content clob;
id is primary key.
If I use a connection pool to connect to Oracle,like following program:
InitialContext ic = new InitialContext();
DataSource ds = (DataSource) ic.lookup("cgOracleDataSource");
con = ds.getConnection();
then following program will throw a ClassCastException
String sql = "select content from t1 where id = ?";
PreparedStatement pst = con.prepareStatement(sql);
pst.setString(1,"001");
oracle.sql.CLOB clob = (oralce.sql.CLOB)rs.getClob("content") //this
statement will throw ClassCastException
but if I use JNDI to connect to Oracle,like following program, then those
program above is ok
private String dbdriver="oracle.jdbc.driver.OracleDriver";
private String dburl="jdbc:oracle:thin:@192.168.7.148:1521:ep";
private String username="ep";
private String password="epuser";
Class.forName(dbdriver);
conn = DriverManager.getConnection(dburl, username, password);
conn.setAutoCommit(false);
On the contrary, if I use JNDI to connect to Oracle, following program will
throw ClassCastException
weblogic.jdbc.vendor.oracle.OracleThinClob clob =
(weblogic.jdbc.vendor.oracle.OracleThinClob)rs.getClob("content");
but it is fine if I use connection pool to connect to Oracle.
I am confused this problem, who can tell me why?
Daniel

When you are getting connection using datasource lookup from weblogic
connection pool, this connection is internally wrapped and hence you have to
cast it to weblogic.jdbc.vendor.oracle.OracleThinClob which you do and so it
works.
But when you get connection by loading driver straight, you are getting naked
oracle connection. In this case when you cast it to oracle.sql.Clob it works,
as you have seen in your test case.
I hope this explains what is going on with your code.
Thanks,
Mitesh
Daniel wrote:
I occur a very problem about JDBC and connection pool on Weblogic Platform
8.1.
There is a table in Oracle
Table
Name: t1
id varchar2(5);
content clob;
id is primary key.
If I use a connection pool to connect to Oracle,like following program:
InitialContext ic = new InitialContext();
DataSource ds = (DataSource) ic.lookup("cgOracleDataSource");
con = ds.getConnection();
then following program will throw a ClassCastException
String sql = "select content from t1 where id = ?";
PreparedStatement pst = con.prepareStatement(sql);
pst.setString(1,"001");
oracle.sql.CLOB clob = (oralce.sql.CLOB)rs.getClob("content") //this
statement will throw ClassCastException
but if I use JNDI to connect to Oracle,like following program, then those
program above is ok
private String dbdriver="oracle.jdbc.driver.OracleDriver";
private String dburl="jdbc:oracle:thin:@192.168.7.148:1521:ep";
private String username="ep";
private String password="epuser";
Class.forName(dbdriver);
conn = DriverManager.getConnection(dburl, username, password);
conn.setAutoCommit(false);
On the contrary, if I use JNDI to connect to Oracle, following program will
throw ClassCastException
weblogic.jdbc.vendor.oracle.OracleThinClob clob =
(weblogic.jdbc.vendor.oracle.OracleThinClob)rs.getClob("content");
but it is fine if I use connection pool to connect to Oracle.
I am confused this problem, who can tell me why?
Daniel

Does JDBC Drivers in Oracle9i support SSL connection

Hi everybody,
I have to access to some information in Oracle9i DB throught SSL connection from Oracle OCI clients. I would like to know if the administrators have to use an specific datasource and OCI driver. I have to verify if Oracle 9i JDBC drivers support SSL connections.
Thanks you very much
Rosa

In order to use SSL, you would need to install and configure Oracle Advanced Security both on the client and on the database. If I recall correctly, this is an additional cost option if you have the Enterprise Edition database.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

Oracle Clobs, datasources, connection pools, RMI ...

Hello all,
We are using Weblogic 7.0, windows 2K server, Oracle 9i and are trying to read from a clob. Using
Weblogic datasources to manage connection pools. We are getting back a weblogic.jdbc.rmi.serialClob
object.
Any help reading data from this?
The main error is "No Data Found".
What else might I tell you to help?
Thanks a bunch for any help.
BTW
We had this working in iplanet and we are converting to weblogic. This is our last major hurdle.
Galen Boyer

On 3 Feb 2004 12:51:26 -0800, Raymond Tiong <[email protected]> wrote:
>
Oracle Database Server 9i supports the usage of LABELS to enforce highly
granular
resource access restrictions at the database level independent of the
application
that is accessing it. In order to use this however, the particular
user, and
not just the application, accessing the database must be known. Oracle
Application
Server (Oracle's J2EE product line) solves this by providing the ability
to PROXY
the identity of the application user and creditials (SSL Certs for
instance) down
to the database server.
I haven't seen a similar ability for BEA Weblogic Server 8.1 which allow
the user
identity and credientials to be PROXIED to the database server. Is this
possible?
Have I missed an important document?
Thanks for any input,
Raymond Tiong
I think there is a section in the JDBC documentation for 8.1 which
describes what it takes to utilize Oracle 9i extension called "Virtual
Private Database". With this extension, one might be able to proxy the
callers
identity to the DB.
See: http://e-docs.bea.com/wls/docs81/jdbc/thirdparty.html#1103627

Oracle JDBC Drivers with Tomcat

I try to connect to Oracle DB with the JDBC Drivers throught Tomcat JNDI access.
I've tried with the oracle.jdbc.driver.OracleDriver and I have an UnsupportedOperationException when calling the getConnection() method on ma dataSource ref.
So I've tried with the oracle.jdbc.pool.OracleConnectionPoolDataSource and I have an java.sql.SQLException:
Cannot create JDBC driver of class
'oracle.jdbc.pool.OracleConnectionPoolDataSource' for connect URL
'jdbc:oracle:thin:@(description=(address=(host=meditws322)(protocol=tcp)(port=1521)
)(connect_data=(sid=HABILLE)))'
Please help I'm about to break down

Thanks for your reply. I use Oracle JDBC driver. The XSQLConfig.xml was changed to have the following setting:
<connection-manager>
<factory>oracle.xml.xsql.XSQLOracleDatasourceConnectionManager</factory>
</connection-manager>
I'm using Tomcat 4.1.x and Apache Commons DBCP Datasources with org.apache.commons.dbcp.BasicDataSourceFactory. The configuration file does set driverClassName to oracle.jdbc.driver.OracleDriver. All other queries embedded in .xsql files work great, I only have issues with queries containing CURSOR() statements. If I switch back to built-in database connectivity, by changing XSQLConfig.xml and connection parameters in .xsql files everything is working again. When I attempt to use DataSources, I get things like this "oracle.jdbc.driver.OracleResultSetImpl@15780d9" instead of nested XML. The non-nested portion of XML looks fine also, so it is retrieving the data from the database properly. Please let me know if I can provide any additional information that could help in resolving this. Thanks in advance!
-M-

JDBC Version/connection pooling

Hi all
I am using JDK1.1.8 (this is device dependant so please don't suggest using a different JDK), and jTurbo1.22 as my driver. I have three questions:
1. What version of JDBC does JDK1.1.8 support?
2. Can I use Connection Pooling with this set up (driver + JDK)?
3. If I can't use connection pooling, any suggestions on how to control more than one connection to a database?
Thanks
John

1. What version of JDBC does JDK1.1.8 support?Version 1.
2. Can I use Connection Pooling with this set up (driver + JDK)?Connection pooling is a interface to a driver. You can do it in any version of java. However, if you are asking about a specific implementation that is a different matter.
3. If I can't use connection pooling, any suggestions on how to control more than one connection to a database?
Control it? Connection pooling requires keeping connections fresh. If you aren't using the connection then something, especially with Oracle, has to do this.
So you solutions are:
-Find a connection pool
-Write your own minimalistic one and deal with keeping the connections fresh.
-Close the connections when you are done with them.

Multithreaded clients and Oracle JDBC-drivers?

Are the thin and OCI8 drivers for Oracle multithreaded? (I know they're thread safe)
I.e. Can many threads share the same Connection object (and statement objects) to do their requests without the requests being serialized to the DB?
Sun's javadoc of package java.sql says:
We require that all operations on all the java.sql objects be multi-thread safe and able to cope correctly with having several threads simultaneously calling the same object.
Some drivers may allow more concurrent execution than others. Developers can assume fully concurrent execution; if the driver requires some form of synchronization, it will provide it. The only difference visible to the developer will be that applications will run with reduced concurrency.
For example, two Statements on the same Connection can be executed concurrently and their ResultSets can be processed concurrently (from the perspective of the developer). Some drivers will provide this full concurrency. Others may execute one statement and wait until it completes before sending the next.
One specific use of multi-threading is to cancel a long running statement. This is done by using one thread to execute the statement and another to cancel it with its Statement.cancel() method.
Restated again for Oracle; Will threads run concurrently when using the same connection and statements, or will the calls be serialized?

In the connection pool, I specified:
user
password
url
In the deployment tool (Sun Java Appl. Server 8 BE Update 1), I specified the "Resource Reference" for the EJB. This leads to the following entries in sun-ejb-jar.xml:
<res-ref-name>jdbc/pdisasdb</res-ref-name>
 <jndi-name>jdbc/pdisasdb</jndi-name>
 <default-resource-principal>
 <name>myname</name>
 <password>geheim</password>
 </default-resource-principal>
</resource-ref> The strange thing is, that now it works without this entry - but I am not gaga, yesterday it doesnt...

Error While reading CLOB from Oracle using WebLogic Connection Pool, Works fine with out using pool

PROBLEM DESCRIPTION :
     When I try to read a clob from Oracle, I receive "ORA-03120: two-task
conversion routine: integer overflow" Error.
     This error occurs only for CLOB Type and only if I try to connect to
Oracle using WebLogic JDriver/Oracle POOL.
     IMPORTANT NOTE: I can read CLOB or any other data using direct JDBC
connection to ORacle with out any problem.
     Below Please find the JAVA CODE for Both Working and NON Working .
Created a Connection Pool as:
Name: MyJDBCConnectionPool
URL : jdbc:weblogic:oracle
DIRVER:weblogic.jdbc.oci.Driver
NON WORKING JAVA CODE (USES WEBLOGIC JDBC CONNECTION POOL TO ORACLE):
Driver myDriver =
(Driver)Class.forName("weblogic.jdbc.pool.Driver").newInstance();
Connection mconn =
myDriver.connect("jdbc:weblogic:pool:MyJDBCConnectionPool",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
WORKING JAVA CODE (USES DIRECT THIN JDBC CONNECTION TO ORACLE):
Driver myDriver =
(Driver)Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
Connection mconn =
myDriver.connect("jdbc:oracle:thin:@server:1521:DB",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
ERROR MESSAGE:
     ORA-03120: two-task conversion routine: integer overflow
I appreciate your help on this problem.

PROBLEM DESCRIPTION :
     When I try to read a clob from Oracle, I receive "ORA-03120: two-task
conversion routine: integer overflow" Error.
     This error occurs only for CLOB Type and only if I try to connect to
Oracle using WebLogic JDriver/Oracle POOL.
     IMPORTANT NOTE: I can read CLOB or any other data using direct JDBC
connection to ORacle with out any problem.
     Below Please find the JAVA CODE for Both Working and NON Working .
Created a Connection Pool as:
Name: MyJDBCConnectionPool
URL : jdbc:weblogic:oracle
DIRVER:weblogic.jdbc.oci.Driver
NON WORKING JAVA CODE (USES WEBLOGIC JDBC CONNECTION POOL TO ORACLE):
Driver myDriver =
(Driver)Class.forName("weblogic.jdbc.pool.Driver").newInstance();
Connection mconn =
myDriver.connect("jdbc:weblogic:pool:MyJDBCConnectionPool",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
WORKING JAVA CODE (USES DIRECT THIN JDBC CONNECTION TO ORACLE):
Driver myDriver =
(Driver)Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
Connection mconn =
myDriver.connect("jdbc:oracle:thin:@server:1521:DB",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
ERROR MESSAGE:
     ORA-03120: two-task conversion routine: integer overflow
I appreciate your help on this problem.

Oracle JDBC Drivers

We are extracting blobs from an 8.05 database. The following statement works only with an older driver for a version I'm not sure whar it is(size is 1419KB, date is 11/3/00 at 9:25AM).
Nothing special in the sql just extracting the column.
pBlob = (oracle.sql.BLOB)rset.getObject(1);
This works fine with the above mentioned driver. All other drivers I have tested 8.15 for 8i, 8.05, 7.34, 8.04, etc. all give the network datatype unsupported error at this statement. I tried the various examples but they were for the oci8 drivers and did not work with thin.
We use the thin(type 4) driver.
Do the new drivers not support the BLOB type for thin?
Does anyone know which driver version and database that the one I described is from?
Thanks.

user452131,
Yes, there are differences between the Oracle 8i JDBC drivers and the Oracle 9i JDBC drivers.
If you haven't already done so, I suggest perusing the following Web page:
http://www.oracle.com/technology/tech/java/sqlj_jdbc/index.html
Good Luck,
Avi.

JDBC Adapter - Connection Pooling

Does anybody know if we can specify a Connection Pool to the JDBC Adapter? I mean the number of connections that the Adapter can have open to say Oracle Data.
Regards
Mike

Hi Michael,
Some of the specifications that are given while configuring the JDBC adapter, especially regarding the number of connections that you acn have...is given clearly in this documentation for JDBC adapter:-
http://help.sap.com/saphelp_nw04/helpdata/en/1d/756b3c0d592c7fe10000000a11405a/frameset.htm
Specifically check for the following parameters :-
db.transactionIsolation=0|1|2|4|8
db.autoCommit=NO|YES
db.pollInterval=
db.retryInterval=
db.logPollInterval=NO|YES
Regards,
Sushumna

Oracle 9.2 connection pooling - need example

Using Oracle 9.2 and Glassfish V2 application server.
The Oracle driver library I am using is ojdbc14_g.jar
I need to convert my web application to use a connection pool rather than a fixed connection.
Databases are not my forte. Connection pools are new to me and I am somewhat confused
on what I have seen so far.
I managed to find an example that I thought would easy to implement in this article:
[http://www.rgagnon.com/javadetails/java-0545.html]
However I ended up with several unresolved references at the following lines:
import oracle.jdbc.pool.OracleConnectionCacheManager;
ods.setConnectionCachingEnabled(true);
ods.setConnectionCacheName(CACHE_NAME);
ods.setConnectionCacheProperties(cacheProps);
ods.close();
This leads me to suspect that I do not have the correct library.
So I am back to where I started.
What I am looking for is an example of how to create and implement a connection pool for my environment
or else some hints on how I can modify the code from the above article to work with my library.
Thanks.

Yes, I did a Google search, that is where I got the reference that I posted.
If I found anything that I could have used, I would have.
The problem is that the stuff I found on the search either does not work in my enviroment
or else I do not undserstand how to use it.
That is why I posted to this forum.
I was hoping that someone here has done this and could give me some help.

Oracle Application server connection pool and database links

I am using Oracle application server 10g with connection pools, the db used by the application connects to another oracle db using a database link. My question is when the application starts it creates 10 connections, does it also create x amount of database links as well?

Hi,
Is there any way to use the connection pool or Datasource while connecting to database?If I am using a stateless sesssion bean and using a Data Access layer which just creates a database session to write the persistence toplink objects how I can make use of application server connection pool?Hi Vinod,
Yes, TopLink allows you to use the app server's connection pooling and transaction services. Chapter 2 of the Oracle9iAS TopLink Foundation Library Guide provides details as do the TopLink examples. The easiest way to set this up is by using the sessions.xml file. The sample XML below is from the file <toplink903>\examples\ias\examples\ejb\sessionbean\sessions.xml. Here we are adding the datasource defined in OC4J and specifying that we are using the OC4J transaction controller also.
<login>
<user-name>sa</user-name>
<password></password>
<datasource>java:comp/env/jdbc/ejbJTSDataSource</datasource>
<uses-external-transaction-controller>true</uses-external-transaction-controller>
<uses-external-connection-pool>true</uses-external-connection-pool>
</login>
<external-transaction-controller-class>oracle.toplink.jts.oracle9i.Oracle9iJTSExternalTransactionController</external-transaction-controller-class>
When using this approach you need to change your TopLink code slightly in the EJB methods:
a. Acquire the ACTIVE unit of work from the server
session (again, see the EmployeeSessionEJB code
example) with something like:
UnitOfWork uow = clientSession.getActiveUnitOfWork();
b. Calls to uow.commit() can be ommitted or commented out
because the EJB will handle this. Note that of course
the methods you create in the EJB that are using this
approach must have TX Required (default).
Hope this helps.
Pete

Does wls8.1 install with oracle jdbc drivers in the classpath by default?

I just went through the 8.1 install tonight and it looks to me like the
oracle jars are in the default weblogic classpath.
set
WEBLOGIC_CLASSPATH=%JAVA_HOME%\lib\tools.jar;%WL_HOME%\server\lib\weblogic_s
p.jar;%WL_HOME%\server\lib\weblogic.jar;%WL_HOME%\server\lib\ojdbc14.jar
Why is that? I don't have oracle, and with just learning how to use wls, it
took me a bit of time to finally figure this piece out (trying to get MySQL
drivers loaded). Not everyone has Oracle installed, so why put it on the
classpath for all servers/domains when they startup?
Thanks.

I'm not sure what the best practice is.
The Oracle driver is set in
bea/weblogic81/common/commEnv.cmd or commEnv.sh.
There is a WEBLOGIC_CLASSPATH that has the jars in it and I always
put my stuff at the beginning.
I suspect that the preferred way of doing this is to update
/bea/weblogic81/samples/domains/examples/startExamplesServer.cmd
or whatever script is used to start the server.
"Flip" <[remove][email protected]> wrote in message news:[email protected]...
Hey Stephen, thanks for the reply.
You got it to work without probs? COOL! :> Where did you stick the driver
and where did you put the jar reference (in which cmd/sh file and where
abouts in the file)? Inquiring minds want to know! :>>>> I tried looking
on the web, but I was referenced to some PRE_CLASSPATH params, as well, as
putting it into my own directories... I'm just looking to find out what dir
is the best practise to dump the jar file into and where to put the
reference in a classpath.
One small note, I do dev in WIN and run production on linux (that might
change soon, but that's another question, and another server :>).
Thanks.
PS BEA, nice domain config wizard with 8.1! Very sweet, I like the
integrated connection pool and datasource creation!
"Stephen Felts" <[email protected]> wrote in message
news:[email protected]...
The Oracle driver (client jar) is shipped in the box. Having it in theCLASSPATH makes it easier
for customers that use it.
If you don't use it and you want to use another driver, it won't get inthe way
since your alternate driver will have a different classname.
I installed and ran MySQL with no problems.
"Flip" <[email protected]> wrote in message
news:[email protected]...
I just went through the 8.1 install tonight and it looks to me like the
oracle jars are in the default weblogic classpath.
set
WEBLOGIC_CLASSPATH=%JAVA_HOME%\lib\tools.jar;%WL_HOME%\server\lib\weblogic_s
p.jar;%WL_HOME%\server\lib\weblogic.jar;%WL_HOME%\server\lib\ojdbc14.jar
Why is that? I don't have oracle, and with just learning how to usewls, it
took me a bit of time to finally figure this piece out (trying to getMySQL
drivers loaded). Not everyone has Oracle installed, so why put it onthe
classpath for all servers/domains when they startup?
Thanks.

Oracle jdbc drivers - cannot resolve symbol

while i'm not new to java, i am new to jdbc. need to connect a java app to an oracle database (hosted by a 3rd party). i have all the connection info. i've crafted a test program, but cannot get it to compile.
here's the code:
import java.sql.*;
public class SimpleJDBC
     public static void main(String[] args) throws SQLException, ClassNotFoundException
     Class.forName(oracle.jdbc.driver.OracleDriver);
     System.out.println("Driver loaded");
     Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@database.host:1521:class"); //, "username", "password");
     System.out.println("Database connected");
     Statement statement = conn.createStatement();
     ResultSet results = statement.executeQuery("select first_name, last_name from user_tbl where last_name = 'Kendall'");
     while(results.next())
          System.out.println(results.getString(1) + "\t" + results.getString(2));
     conn.close();
}i've set the classpath to the location of the ojdbc14.jar, and it shows in the classpath when i do a "set" on the cmd line. i've tried it in netbeans, eclipse, and straight cmd line.
i always come up with the same message (cannot resolve symbol) on the line where i call Class.forName(oracle.jdbc.driver.OracleDriver);.
i've tried compiling and setting the classpath at the same time. i added the ojdbc14.jar to the compile/build paths in both the ides. i even tried using the old classes12.jar. nothing has worked.
i can't figure out what else there is. within the ides, the intellisense will actually let me put that line in (piece by piece), but then it shows an error.
any suggestions?

Place the string name of the driver in quotes.
- Saish

Is in ORACLE JDBC drivers connection pooling support

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