Oracle JDBC Thin-Driver: Connection still valid (db still open)?

Hi,
I've got a problem with my program. The app opens a connection to an Oracle Database usingt the Oracle JDBC Thin.Driver. Everything works just fine but I can't figure out a way how to find out wheter the connection is still valid, e.g. if the database is still open?
connection.isClosed() return always false :(
Any help is appreciated.
Thanks,
Spaulding

Hi oracle_guru,
unfortunately it's not that easy. :(
You can't just check for
if(conn == null)since the connection won't realize when the db shuts down.
Therefore I created a connection-watcher-thread which uses a prepared statement to check every once in while if the connection is still valid.
Nevertheless, thanks for you reply,
Spaulding

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Bug in Oracle JDBC thin driver (parameter order)

[ I'd preferably send this to some Oracle support email but I
can't find any on both www.oracle.com and www.technet.com. ]
The following program illustrates bug I found in JDBC Oracle thin
driver.
* Synopsis:
The parameters of prepared statement (I tested SELECT's and
UPDATE's) are bound in the reverse order.
If one do:
PreparedStatement p = connection.prepareStatement(
"SELECT field FROM table WHERE first = ? and second = ?");
and then bind parameter 1 to "a" and parameter to "b":
p.setString(1, "a");
p.setString(2, "b");
then executing p yields the same results as executing
SELECT field FROM table WHERE first = "b" and second = "a"
although it should be equivalent to
SELECT field FROM table WHERE first = "a" and second = "b"
The bug is present only in "thin" Oracle JDBC driver. Changing
driver to "oci8" solves the problem.
* Version and platform info:
I detected the bug using Oracle 8.0.5 server for Linux.
According to $ORACLE_HOME/jdbc/README.doc that is
Oracle JDBC Drivers release 8.0.5.0.0 (Production Release)
* The program below:
The program below illustrates the bug by creating dummy two
column table, inserting the row into it and then selecting
the contents using prepared statement. Those operations
are performed on both good (oci8) and bad (thin) connections,
the results can be compared.
You may need to change SID, listener port and account data
in getConnecton calls.
Sample program output:
$ javac ShowBug.java; java ShowBug
Output for both connections should be the same
--------------- thin Driver ---------------
[ Non parametrized query: ]
aaa
[ The same - parametrized (should give one row): ]
[ The same - with buggy reversed order (should give no answers):
aaa
--------------- oci8 driver ---------------
[ Non parametrized query: ]
aaa
[ The same - parametrized (should give one row): ]
aaa
[ The same - with buggy reversed order (should give no answers):
--------------- The end ---------------
* The program itself
import java.sql.*;
class ShowBug
public static void main (String args [])
throws SQLException
// Load the Oracle JDBC driver
DriverManager.registerDriver(new
oracle.jdbc.driver.OracleDriver());
System.out.println("Output for both connections should be the
same");
Connection buggyConnection
= DriverManager.getConnection
("jdbc:oracle:thin:@localhost:1521:ORACLE",
"scott", "tiger");
process("thin Driver", buggyConnection);
Connection goodConnection
= DriverManager.getConnection ("jdbc:oracle:oci8:",
"scott", "tiger");
process("oci8 driver", goodConnection);
System.out.println("--------------- The end ---------------");
public static void process(String title, Connection conn)
throws SQLException
System.out.println("--------------- " + title + "
Statement stmt = conn.createStatement ();
stmt.execute(
"CREATE TABLE bug (id VARCHAR(10), val VARCHAR(10))");
stmt.executeUpdate(
"INSERT INTO bug VALUES('aaa', 'bbb')");
System.out.println("[ Non parametrized query: ]");
ResultSet rset = stmt.executeQuery(
"select id from bug where id = 'aaa' and val = 'bbb'");
while (rset.next ())
System.out.println (rset.getString (1));
System.out.println("[ The same - parametrized (should give one
row): ]");
PreparedStatement prep = conn.prepareStatement(
"select id from bug where id = ? and val = ?");
prep.setString(1, "aaa");
prep.setString(2, "bbb");
rset = prep.executeQuery();
while (rset.next ())
System.out.println (rset.getString (1));
System.out.println("[ The same - with buggy reversed order
(should give no answers): ]");
prep = conn.prepareStatement(
"select id from bug where id = ? and val = ?");
prep.setString(1, "bbb");
prep.setString(2, "aaa");
rset = prep.executeQuery();
while (rset.next ())
System.out.println (rset.getString (1));
stmt.execute("DROP TABLE bug");
null

Horea
In the ejb-jar.xml, in the method a cursor is closed, set <trans-attribute>
to "Never".
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name></ejb-name>
<method-name></method-name>
</method>
<trans-attribute>Never</trans-attribute>
</container-transaction>
</assembly-descriptor>
Deepak
Horea Raducan wrote:
Is there a known bug in Oracle JDBC thin driver version 8.1.6 that would
prevent it from closing the open cursors ?
Thank you,
Horea

Oracle JDBC Thin Driver and Firewall Problem

Hi!
We have Oracle 8.1.5 and Websphere App Server. There is a
firewall between the two. A servlet creates a connection pool
(not that of Wesphere's). The frontend is JSP/HTML (no applets).
The servlet uses the Oracle JDBC Thin Driver for DB Connections.
The problem is - Once the connection is freed, the connection
pool is not being able to retrieve it and hence it created
another one, thus reaching the max. # of connections and the
system hangs. Restarting the DB service flushes the connection
and the application starts running again...
There was a similar problem discussed in this forums long ago. I
have not yet tried mentioning the firwall port and IP in the
connection string. But apart from that, is there any other
setting I need to do (on firewall or for the connectionstring)
to deal with this problem?
Someone had suggested to punch a hole in the firewall for the DB
port - but we can not really do that in the current scenario...
I would appreciate if anyone could share their experience
regarding how they resolved this issue.
Thanks in advance,
Vijaya.

One more question -
Can we use Oracle JDBC OCI driver? We do not have any appletes...
Does it have firewall issues too? Is there any other driver that
we can use?
Thanks,
Vijaya.

Sql_trace does not work for Java app using Oracle JDBC thin driver

Hi,
I'm using Oracle 8.1.7. I enabled sql trace at instance level by setting sql_trace and timed_statistics to true in init.ora. I restarted the db instance. I wrote a stand-alone java application which used Oracle JDBC thin driver(classes12.zip) to make a connection to my db instance, do some select statements, and close the connection. There were no trace files generated in the folder specified by udump_dest variable. However, if I used sqlplus or dba studio, I saw trace files generated. Has anyone got Oracle sql trace work for JDBC calls from java apps.
Thanks in advance!

Hi,
I'm using Oracle 8.1.7. I enabled sql trace at instance level by setting sql_trace and timed_statistics to true in init.ora. I restarted the db instance. I wrote a stand-alone java application which used Oracle JDBC thin driver(classes12.zip) to make a connection to my db instance, do some select statements, and close the connection. There were no trace files generated in the folder specified by udump_dest variable. However, if I used sqlplus or dba studio, I saw trace files generated. Has anyone got Oracle sql trace work for JDBC calls from java apps.
Thanks in advance!

How does Oracle JDBC thin driver handle numbers via getString?

Hi,
I have a query regarding how numbers are handled by the oracle jdbc thin driver. The issue I am facing is with regards to the decimal separator (. is en_US and , in pt_BR)
e.g. Consider the below code,
Connection conn = DriverManager.getConnection(...);
Statement stmt = conn.createStatement();
ResultSet rset = stmt.executeQuery("select value from test_table1");
while (rset.next())
System.out.println (rset.getString(1));
test_table1 has a single column of sql type 'number' with a single row having value "123.45"
NLS_NUMERIC_CHARACTERS = ".,"
Database version = 10.2.0.2.0
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My question is whether the jdbc driver formats numbers (based on the locale) before returning it as a string as part of the getString method?
e.g.
java -Duser.language=pt -Duser.region=BR TestJDBC
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Is there a reason why getString always retrieves a number column value with '.' as the decimal separator?
To help make things a bit more clear, all the column values retrieved are then converted into an XML (and hence the conversion to string)
At present, the only way I see out of this is to handle numbers differently.
i.e. something similar to,
if (resultsetmetadata.getcolumntype .. = double OR float OR int OR long.. )
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Is there a better way to resolve this issue?
Thanks,
Binoy

user565580,
As has been already stated, Oracle does not have data-types INTEGER or SMALLINT, only NUMBER.
So even though Oracle lets you write INTEGER, it really creates a NUMBER.
(As Joe mentioned.)
Other databases don't have a NUMBER data-type, they have INTEGER, SMALLINT, etc.
Originally, Oracle database only had three data-types:
CHAR
DATE
NUMBER
If you're going to be working with Oracle database, then you need to adapt yourself to its limitations.
So you'll probably need to define NUMBER data-types using scale and precision.
(As Kuassi mentioned.)
Good Luck,
Avi.

Change expired password using oracle jdbc thin driver

Hello,
I have a java program that uses the oracle jdbc thin driver (ojdbc6 - version 11.2.0.3) for database connection. My question is if I have any possibility to change an expired password (java.sql.SQLException: ORA-28001: the password has expired) using the thin driver - NOT OCI?

No - the thin driver doesn't have any password management features.

JDBC thin driver connection problems using cybersafe authentication

Hi
i am trying to use jdbc thin driver to connect to oracle 8.1.7 DB using ASO and cybersafe authentication.
Question:
Does the oracle jdbc thin driver in 8.1.7.0.0 support third-party authentication features supported by Oracle Advanced Security--such
as those provided by RADIUS, Kerberos, or SecurID
i am getting the following error.
Exception in thread "main" java.sql.SQLException: invalid arguments in call
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java)
at oracle.jdbc.dbaccess.DBError.check_error(DBError.java)
at oracle.jdbc.ttc7.TTC7Protocol.logon(TTC7Protocol.java)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.ja
va)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java)
at java.sql.DriverManager.getConnection(DriverManager.java:517)
at java.sql.DriverManager.getConnection(DriverManager.java:146)
at ASOJdbc.main(ASOJdbc.java:43)
Following is the program i am trying.
public class ASOJdbc {
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          String url = "jdbc:oracle:thin:@son1129:1521:sonias";
          Connection con;
          String query = "select EMPNO, ENAME from EMP";
          Statement stmt;
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               Properties props = new Properties();
               try {
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               props.put("oracle.net.authentication_gssapi_service", "oracle/[email protected]");
               props.put("oracle.net.encryption_types_client", "DES");
               props.put("oracle.net.encryption_types_server", "DES");
               props.put("oracle.net.crypto_seed", "4fhXXXX");
               } catch (Exception e) { e.printStackTrace();
               DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
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               con = DriverManager.getConnection(url, props);
               stmt = con.createStatement();
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jdk version: jdk 1.3.1
Oracle jdbc driver information, which i obtained as per Note 94091.1
=============
Database Product Name is Oracle
Database Product Version is Oracle8i Enterprise Edition Release 8.1.7.1.1 - Production With the Partitioning option
JServer Release 8.1.7.1.1 - Production
JDBC Driver Name is Oracle JDBC driver
JDBC Driver Version is 8.1.7.0.0
JDBC Driver Major Version is 8
JDBC Driver Minor Version is 1

1. What JDBC Thin client Driver are you using? (version) If you don't know, open up the Manifest.
2. the JDBC/OCI driver is a thick driver. It uses the oracle client, and therefore should read the tnsnames.ora
3. You have yet to give us any ORA- errors, which would help immensely in troubleshooting.

Bug in Oracle JDBC thin driver 8.1.6 ?

Is there a known bug in Oracle JDBC thin driver version 8.1.6 that would
prevent it from closing the open cursors ?
Thank you,
Horea

Horea
In the ejb-jar.xml, in the method a cursor is closed, set <trans-attribute>
to "Never".
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name></ejb-name>
<method-name></method-name>
</method>
<trans-attribute>Never</trans-attribute>
</container-transaction>
</assembly-descriptor>
Deepak
Horea Raducan wrote:
Is there a known bug in Oracle JDBC thin driver version 8.1.6 that would
prevent it from closing the open cursors ?
Thank you,
Horea

Oracle JDBC Thin Driver for oracle 9.2.0.4

Hi,
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Thanks in anticipation

user566773,
As far as I know, all Oracle JDBC drivers are meant to be backward compatible.
According to the table on the following Web page, the latest Oracle JDBC driver can be used with Oracle 9.2.0.x DBMS.
http://www.oracle.com/technology/tech/java/sqlj_jdbc/index.html
Good Luck,
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Jdbc thin driver connect oracle as internal

I need to connect to Oracle as Internal using jdbc driver, is there a way we can do this using jdbc thin driver. Actually I don't want to pass username and password as it will be harcoded in a properties file.
Please let me know.

Hi Minol,
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Connecting to Oracle Database with DBA privileges
http://myjdbc.tripod.com/basic/codeindex.html
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//Import IO related classes
import java.io.IOException;
// Necessary support classes
import java.util.Properties;
import java.util.Enumeration;
import java.util.ResourceBundle;
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   * @param file File path
   * @return Properties The properties object
   * @exception IOException if loading properties file fails
   * @since 1.0
public static Properties loadParams(String file)
      throws IOException {
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    ResourceBundle bundle = ResourceBundle.getBundle(file);
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    String      key = null;
    while (enum.hasMoreElements()) {
      key = (String) enum.nextElement();
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}Regards
Elango.

Oracle 7 - JDBC Thin driver - connect - compatibility

When logging on to an Oracle server v.7.2.3.0.0 with JDBC-thin
driver (classes111.zip), I get the message:
ORA-01017 invalid username/ password; logon denied
even if the password, username and connection string is correct.
The connection worked OK until some work was performed on the
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I thought the driver worked OK with all versions of SQL*Net
listeners?
The database can be connected to with SQL*Plus.
null

I have the same problem trying to connect to database cache on iAS with iAS.

Jdbc oracle jdbc-thin driver subname

I am working on Windows 2000 environment, using oracle8i 8.1.7 JDBC-Thin driver for use with JDK 1.2.x. The oralce8i 8.1.7 database is on another linux box. I can access the linux box through its ip address, but not by its hostname since it's not accessiable by the dns server. In my code, in the JDBCUrl, I used ip address instead of the hostname, e.g. "jdbc:oracle:thin:@10.0.113.108:1521:ora1". But I got the error like: "java.sql.SQLException: Io exception: The Network Adapter could not establish the connection". If I add a entry in my working machine's hosts file to map the hostname, I can fix the problem. But I don't know if this is the solution, or there is other better solutions.
Thanks
null

Using a hosts file entry is a common solution for problem where the dns lookup does not contain an entry for a RDBMS server platform.
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Oracle Jdbc Thin driver and nls suppot

Hello,
I have a hungarian database with nls_lang variable set to hungarian. I'm trying to do a jdbc connection using classes12.zip
but I'm getting the hungarian characters converted to question marks or other characters.
I read suggestions that I must include the nls_charset12.zip in my classpath too. So I did that but I'm still having the same problem.
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One more question -
Can we use Oracle JDBC OCI driver? We do not have any appletes...
Does it have firewall issues too? Is there any other driver that
we can use?
Thanks,
Vijaya.

Oracle JDBC thin driver question

Does anyone know if there is a JDBC thin driver available for Oracle that supports "HTTP tunneling" of the SQLNET wire protocol?
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The easiest thing to do is download it as an archive with your applet.
Otherwise, you have to have the files on every client machine.
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Using Oracle JDBC Thin Driver

We are trying to use the Oracle supplied JDBC thin driver directly from within a jar file we add for our application.
The classes in the jar file directly connect to an oracle database via the thin driver.
The problem we've encountered is that if the JDBC Connection object is held in memory, after some time, the connection times out for no reason.
Is there some restriction with weblogic in connecting directly to database from a class file and then caching the connection reference? It almost seems as if weblogic is severing the connections.
thank you,
BJ

Stefan,
You are right, although I would recommend just having the
TestConnectionOnReserve= true and the testTableName set. Refresh Minutes
becomes kind of redundent when you set these values.
TestConnsOnReserve allows the server to verify if a connection that the
client/application has requested is good , otherwise it recreates this
connection and gives it to the client/application.
hth
sree
"Stefan" <[email protected]> wrote in message
news:[email protected]...
Hi Sree,
If instead a WL connection pool would be used this issue could be solved
using
"Refresh Period" and TestTableName right? In this case the connection would
be
alive as long as WL server is up. As a bonus we would have an automatic
reconnection
after an Oracle server reboot?
thanks, stefan
"Sree Bodapati" <[email protected]> wrote:
Hi BJ,
When you get connection directly using the Oracle thin driver, this is
for
sure your database timing out the connection when no activity is detected
for sometime. You should consult with your DBA to ensure this timeout
is set
to a higher value at the server or ensure you dont hold on to theconnection
for long durations or ensure you handle this situation by triggering
a
generic oracle process so that you periodically keep the connection busy
to
ensure that the database does not close it.
This shouldnt be anything to do with WebLogic as you dont seem to be
using
WebLogic connection pool.
hth
sree
"BJ Choi" <bongjin.choi@neoforma> wrote in message
news:[email protected]...
We are trying to use the Oracle supplied JDBC thin driver directly from
within a jar file we add for our application.
The classes in the jar file directly connect to an oracle database via
the
thin driver.
The problem we've encountered is that if the JDBC Connection object is
held
in memory, after some time, the connection times out for no reason.
Is there some restriction with weblogic in connecting directly to database
from a class file and then caching the connection reference? It almost
seems
as if weblogic is severing the connections.
thank you,
BJ

Oracle JDBC Thin-Driver: Connection still valid (db still open)?

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