Jdbc and java stored procedures

Hi all,
I am new to Oracle Java Stored Procedures but I am interested in knowing to which extent is object passing supported.
Can I send any kind of object to a java stored procedure? And back from the procedure? Anybody knows any good resources online about Java Stored Procedures and JDBC?
I also saw that to pass the string back you need to specify java.lang.string, how would I do in order to pass back a user defined object, do I have to register the class in Oracle before (and if yes, how?)or is the classpath enough?
Many thanks,
A.

Hi again,
perhaps I didn't understand exactly what you meant with "publish", AFAIK you have to expose the java class (i.e. RowCounter) by using
CREATE OR REPLACE FUNCTION row_count (tab_name VARCHAR2) RETURN NUMBER
AS LANGUAGE JAVA
NAME 'RowCounter.rowCount(java.lang.String) return int';
(BTW this works fine)
or else you cannot access the java class you loaded on the server, and that's where my questions arose. What if I am passing an object, let's say myObject, shouldn't I use the STRUCT mapping then or something like that?
Or, could you clarify what do you mean by publishing to SQL, I just need to access the class from jdbc, not from PL/SQL or others, but as I understand to call the class from JDBC I need to call the function or procedure that calls the class and then I could call it from PL/SQL as well...
Thanks,
A.

Similar Messages

SQLJ and Java Stored Procedures

Hi,
Am very sorry, if I am taxing you too much with Java Stored Procedures!!
However, I have struggling with it for more than 3 days or so.So please bear with me
I am facing a peculiar problem on the subject.
I have deployed a Java Stored Procedure using Connection name as "JDBC" through JDev.
My client calls the Stored procedure getDept as follows:
int deptNo = 0;
String deptName = null,
deptLoc = null;
#sql {
call sample.getDept( :out deptNo,
:out deptName,
:out deptLoc)
In my project properties , in SQLJ tab, when I select "JDBC" as my connectionName, and leave the ContextName blank(i.e. DefaultContext), I get the following error :
Error: [26] Not Found: SAMPLE.GETDEPT There is no stored procedure with this name
When I leave the ConnectionName as blank (which I suppose means donot do online checking!!), it compiles OK.
Howvever, it is not able to run my SQLJ file!!
Cannot figure out why this is happening.Please help!!
TIA
Sandeep
null

Looks like Java stored procedure don't support the return of result sets to the client. Given the complexity and non-generic 'cursor ref' approach that Oracle has always implemented, I guess it is not too surprising. I suggest throwing the select into a work table and pulling the rows from there. If you are in a COM capable environment, you can use 0040 to get back a Dynaset, but be aware, it is live!
Good luck.
Cal

EM and Java stored procedures

Could anyone answer the following questions ?
1. Will Enterprise Manager Version 2.2 and 9.2 tune Java Stored Procedures?
2. If not, are there plans in EM 4.0 for Enterprise Manager to tuneJava Stored Procedures?
cheers!
Karthik

Hi again,
perhaps I didn't understand exactly what you meant with "publish", AFAIK you have to expose the java class (i.e. RowCounter) by using
CREATE OR REPLACE FUNCTION row_count (tab_name VARCHAR2) RETURN NUMBER
AS LANGUAGE JAVA
NAME 'RowCounter.rowCount(java.lang.String) return int';
(BTW this works fine)
or else you cannot access the java class you loaded on the server, and that's where my questions arose. What if I am passing an object, let's say myObject, shouldn't I use the STRUCT mapping then or something like that?
Or, could you clarify what do you mean by publishing to SQL, I just need to access the class from jdbc, not from PL/SQL or others, but as I understand to call the class from JDBC I need to call the function or procedure that calls the class and then I could call it from PL/SQL as well...
Thanks,
A.

About BC4j and java stored procedure

Is it possible create a java stored procedure using BC4j and deploy to Oracle9iR2 VM?
If it is possible, how about the performance compare to PL/SQL stored procedure?

In 9.0.3.3 it will be possible again. The ability to deploy a BC4J-based, local-mode Java Stored Procedure was broken in 9.0.3 before this upcoming maintenance release.
PL/SQL will almost surely be faster if you are talking about just doing basic DML type of operations, when compared to Java stored procedures.

8i Lite and Java Stored Procedure

Has anyone had success running the Java
Stored Procedure examples with 8i LIte.
My SQLPLus window alwways dies when the demo sql script triest to attach the stored procedure to the table.
The line causing error is:
++++++++++++++++++++++++++++++++++++++++++
alter table inventory attach java source "Oracle.lite.INVENTORY" in '.'
with constructor args(PID,QTY,THRESHOLD);
+++++++++++++++++++++++++++++++++++++++++++
I am using Sun JDK1.3 on Windows2000.
Any help will be highly appreciated.
null

Found the issue. jvm.dll was not in the path.
Bhaven
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Bhaven Avalani ([email protected]):
Has anyone had success running the Java
Stored Procedure examples with 8i LIte.
My SQLPLus window alwways dies when the demo sql script triest to attach the stored procedure to the table.
The line causing error is:
++++++++++++++++++++++++++++++++++++++++++
alter table inventory attach java source "Oracle.lite.INVENTORY" in '.'
with constructor args(PID,QTY,THRESHOLD);
+++++++++++++++++++++++++++++++++++++++++++
I am using Sun JDK1.3 on Windows2000.
Any help will be highly appreciated.
<HR></BLOCKQUOTE>
null

Scripted JDBC and Oracle Stored Procedure with in/out Array

The com.waveset.util.pooledconnection used by Scripted JDBC Adapter extends java.sql.connection.
I need to pass an Varchar2 Array to the Stored Procedure. I tried using the oracle.sql.ARRAY and oracle.sql.ArrayDescriptor to pass the values, but get a casting exception,as the polledconnection implements only the java.sql.connection and not oracle.sql.connection.
What are my options of using java.sql.Array with a PL/SQL procedure that takes a varchar2 array as in out parameter?
Thanks
Venki

i ran my procedure which is very similar syndra posted
create or replace procedure foo(p_dt in date, cv out sys_refcursor) as
begin
open cv for
select e.*
from table_xyz e
where start_dt = p_dt;
end;
/Here is how is executed
DECLARE
P_DT DATE;
CV SYS_REFCURSOR;
BEGIN
P_DT := '10-oct-2005';
-- CV := NULL; Modify the code to initialize this parameter
scott.foo ( P_DT, CV );
COMMIT;
END;
-- i get PL/SQL procedure successfully complted , But i dont see the result set Or output
- How do i see the output when i m using refcursor ?? i tried using print , but nothing didnt work
- Any idea ??
Thank you!!
Edited by: user642297 on Jun 24, 2010 1:35 PM

Help Needed in Creating Java Class and Java Stored Procedures

Hi,
Can anyone tell how can i create Java Class, Java Source and Java Resource in Oracle Database.
I have seen the Documents. But i couldn't able to understand it correctly.
I will be helpful when i get some Examples for creating a Java Class, Java Source and Stored Procedures with Java with details.
Is that possible to Create a Java class in the oracle Database itself ?.
Where are the files located for the existing Java Class ?..
Help Needed Please.
Thanks,
Murali.v

Hi Murali,
Heres a thread which discussed uploading java source file instead of runnable code on to the database, which might be helpful :
Configure deployment to a database to upload the java file instead of class
The files for the java class you created in JDev project is located in the myworks folder in jdev, eg, <jdev_home>\jdev\mywork\Application1\Project1\src\project1
Hope this helps,
Sunil..

Java Stored Procedure in EXECUTE IMMEDIATE

Hi,
I need advice for the following.
I'm on Oracle 11g R2. I'm testing application in Oracle 11gR1 and R2 and Oracle Express.
Purpose is to generate XML reports.
I have PLSQL Stored Procedure which does that, but since there is bug in Oracle11gR2 related to XMLTRANSFORM I have and Java Stored Procedure which is workaround. They are both compiled, valid etc.
Java class is :
import java.io.PrintWriter;
import java.io.Writer;
import oracle.xml.parser.v2.DOMParser;
import oracle.xml.parser.v2.XMLDocument;
import oracle.xml.parser.v2.XSLProcessor;
import oracle.xml.parser.v2.XSLStylesheet;
* This class is used as Java stored procedure
* There is a bug on Oracle11gR2, related to the limitation on the number of style sheet instructions
* This stored procedure is workaround when PLSQL code can not be used.
* File must not have package, otherwise is wrongly compiled in DB
public class JavaXslt {
     public static void XMLTtransform(oracle.sql.CLOB xmlInput,oracle.sql.CLOB xslInput,oracle.sql.CLOB output) throws Exception{
          DOMParser parser;
          XMLDocument xml;
          XMLDocument xsldoc;
          try{
               parser = new DOMParser();
               parser.parse(xmlInput.getCharacterStream());
               xml = parser.getDocument();
               parser.parse(xslInput.getCharacterStream());
               xsldoc = parser.getDocument();
               XSLProcessor processor = new XSLProcessor();
               XSLStylesheet xsl = processor.newXSLStylesheet(xsldoc);
               Writer w = output.setCharacterStream(1L);
               PrintWriter pw = new PrintWriter(w);
               processor.processXSL(xsl, xml, pw);
          }catch (Exception ex){
               throw ex;
PROCEDURE Java_XmlTransform (xml CLOB, xslt CLOB, output CLOB) AS LANGUAGE JAVA
NAME 'JavaXslt.XMLTtransform(oracle.sql.CLOB, oracle.sql.CLOB, oracle.sql.CLOB)';
I'm calling Java stored procedure from PLSQL Stored procedure (if it is Oracle11gR2) like that :
Java_Proc.Java_XmlTransform(inputXML, xslt, res);
So till here everything works ok. XSLT as applied and output XML (res) is OK.
But when Oracle Express is used Java is out of the question, so there is no Java stored procedure. Howewer PLSQL Stored procedure is still needed.
So I had to put call to Java Stored procedure in EXECUTE IMMEDIATE statement in order to compile to PLSQL package.
But when I do that :
EXECUTE IMMEDIATE 'BEGIN Java_Proc.Java_XmlTransform (:1, :2, :3); END;' USING inputXML, xslt, res;
result value CLOB (res) has zero length...
What am I missing? Should i set return value to Java class?
Hope my explanations are clear though.
Thanks

Hi odie_63,
Thanks for quick response.
I didn't clearly explained.
When using Oracle 11gR1 and Oracle Express I'm using only PLSQL Procedure.
When using Oracle 11gR2 i have to use Java Stored procedure because there is documented bug in R2.
That's why i have to use EXECUTE IMMEDIATE. I don't know which version is the client DB and whether there is or no Java procedures.
I did tried
EXECUTE IMMEDIATE 'BEGIN Java_Proc.Java_XmlTransform (:1, :2, :3); END;' USING IN inputXML, IN xslt, OUT res; and the result was ORA-06537: OUT bind variable bound to an IN position
When using IN OUT for last parameter i.e.
EXECUTE IMMEDIATE 'BEGIN Java_Proc.Java_XmlTransform (:1, :2, :3); END;' USING IN inputXML, IN xslt, IN OUT res;
there is no exception, but still DBMS_LOB.getlength(res) = 0
Thanks

How to retrieve 'long' column with 32K length in Java stored procedure

For some reasons, we are not using CLOB, BLOB, or BFILE to store large objects and I have to live with LONG. So I wrote a Java stored procedure to insert, select and manipulate a LONG column by retrieving the LONG into a java.lang.String class (which happens to be the Java class mapped to the LONG SQL datatype). It all works fine as long as the length of the value being retrieved is less than the magic figure of 32767 bytes (which is the restriction on LONG and VARCHAR2 datatype in PL/SQL as well). So looks like Oracle's implementation of the JVM limits String values to a max of 32767 bytes. Suggestions on how to overcome this limitation (other classes that you suggest or do I have to move to files)?
Thanks,
Jeet
null

the jvm has nothing to do with it ...
this is a pol/sql limitation on parameters in stored procedures.
and java stored procedures require a clal spec that makes the j-s-p look like a pl/qsl stored proc.

Java Stored Procedures take longer to execute

Hi,
I am doing a comparison of Oracle and Java Stored procedures in terms of execution time. I have created a java stored proc and an Oracle stored proc both of which perform the same task. Upon execution, I find that the java proc takes longer time to execute.
I have the following qs:-
Why are Java Stored Procs slower than Oracle Stored Procs?
How is a java stored proc executed as compared to an Oracle Stored Proc?
Can someone give a detailed explanation of -
- how a java stored proc is stored in the database?
- what happens when it is executed?
Thanks in advance
Nusrat

Why are Java Stored Procs slower than Oracle Stored Procs?java program slower than native code! hold the front page!
On second thoughts don't bother.
Cheers, APC

Parameter length limition passing to java stored procedure! help

hi:
i am working with java stored procedure to do some resource consuming work. i have to pass a long string (varch2) or bytes(log raw) which is larger than 32k which is the limitation
set by oracle.
is there a walk around?
another question:
i have to call java stored procedure from session beans ( weblogic app server) and how can i make sure the code
in session beans and that in java stored procedures to be in
the same transaction?
regards
daniel wang

Hi Daniel,
In answer to your first question: use a CLOB (for the long string)
and a BLOB (for the long raw). Do a search for CLOB and BLOB at the
Technet site:
http://technet.oracle.com
There are lots of resources including documentation and sample code.
In answer to your second question: first, let me say that the J2EE
forum is more suitable for that question (I haven't looked yet, but
you may have posted there as well!). Anyway, you need to set an
appropriate transaction attribute in your "ejb-jar.xml" descriptor
file for your session bean. If you want to make sure that the
session bean and java stored procedure participate in the same
transaction, I suggest using "Required", as in:
<trans-attribute>Required</trans-attribute>
Hope this helps.
Good Luck,
Avi.

APEX fails with Java stored procedure that creates a JDBC connection

Hello!
We are facing a strange problem since we have upgraded from Oracle 10g and Apache to Oracle 11g with Embedded Gateway.
Here is what we do:
** APEXX calls a PL/SQL package function "OPEN_CONNECTION" that wraps a Java stored procedure called "openConnection".*
FILE_READER_REMOTE_API.openConnection(user, password, host, port, service);
** The Java stored procedures "openConnection" opens a JDBC connection to an other database:*
public class FileReaderRemote {
private static Connection conn = null;
private static DefaultContext remoteContext = null;
public static void openConnection(String user, String password, String host, String port, String service) throws SQLException {
// Load the Oracle JDBC driver
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
java.util.Properties props = new java.util.Properties();
props.put ("user", user);
props.put ("password", password);
//props.put ("database", "//" + host + ":" + port + "/" + service);
props.put ("database", host + ":" + port + ":" + service);
props.put("v$session.program", "FileReaderRemote2");
// Connect to the database
remoteContext = Oracle.getConnection("jdbc:oracle:thin:", props);
This procedure used to work fine before the upgrade, but now we see the following:
* It still works when called directly from TOAD or SQL*Plus, even under the user ANONYMOUS.
* When called from APEX and the target database is Oracle 11g, it still works.
* When called from APEX and the target database is Oracle 10g, it takes several minutes and we receive this error:
*"Socket read timed out"*
We have tested the following workaround:
We have created a database link to our own database and called the stored procedure through that database link.
FILE_READER_REMOTE_API.openConnection*@loopback*(user, password, host, port, service);
This works, but is not really an option.
I hope some one of you can explain this strange behaviour to me.
Best regards,
Matthias

You wrote
"Java stored procedures -- by definition - are stored in the 8i rdbms. !!"
From the Oracle8i Java Stored Procedures Developer's Guide
Release 8.1.5
A64686-01
"If you create Java class files on the client side, you can use loadjava to upload them into the RDBMS. Alternatively, you can upload Java source files and let the Aurora JVM compile them. In most cases, it is best to compile and debug programs on the client side, then upload the class files for final testing within the RDBMS"
This means that you can create shared classes that are used on both the client and server side. The source does not need to reside within the server (according to their documentation). Please also note the following from the Oracle8i JDBC Developer's Guide and Reference Release 8.1.5 A64685-01 for using the getConnection() method on the server:
"If you connect to the database with the DriverManager.getConnection() method, then use the connect string jdbc:oracle:kprb:. For example:
DriverManager.getConnection("jdbc:oracle:kprb:");
Note that you could include a user name and password in the string, but because you are connecting from the server, they would be ignored."
So if you're coding a shared class that is to run on both the client and server side, you might do something like this:
Connection conn =
DriverManager.getConnection(
System.getProperty("oracle.server.version") == null
? "jdbc:oracle:thin:@hostname:1521:ORCL"
: "jdbc:oracle:kprb:"),
"youruserid","yourpassword");
As stated earlier, the userid and password are supposedly ignored for server connections retrieved in this manner. I haven't tried this yet, but it is documented by Oracle.
Regards,
Steve
null

Java Stored Procedures and Sockets

We need to synchronize data real time b/w Oracle and the legacy HP3000 system.
For sending data from Oracle to HP3000 we are thinking of using Sockets.
We dont know whether a socket connection can be established from the Oracle database level or need to be from the OS level(here Linux)
I heard that Java stored procedures(JSP) can establish socket connection.
Can someone provide me pointers regarding
(a) setting up socket connection from the database
(b) possibility of transferring data via sockets and using jdbc, and how to send data efficiently and if it is wise
Thanks,
Vinoj

I don't have much experience with Lite, but I'm running 9i Personal Edition. Any information about triggers can be found in the "ALL_TRIGGERS" view. You will want to filter out any rows where OWNER = 'SYS' unless you created your triggers as SYS. As for procedures and functions, you can see what you have created in the "ALL_OBJECTS" view where OBJECT_TYPE = 'PROCEDURE' or 'FUNCTION', once again filtering out rows where OWNER = 'SYS'. To see the code of any procedure or function, select substr(text,1,80) from ALL_SOURCE where NAME = 'function name' ORDER BY LINE.
Hope this helps!

Java Stored Procedures and Triggers

I want to to use Java stored procedures and triggers within the Oracle 11g XE
So please , someone can help me because i tried but it didn't work
I don't know where is the problem
Thanks !!

WRONG FORUM!
Welcome to the forum but this forum is for Java JDBC questions and issues. Your question should be posted in the SQL and PL/SQL forum
PL/SQL
>
I want to to use Java stored procedures and triggers within the Oracle 11g XE
So please , someone can help me because i tried but it didn't work
I don't know where is the problem
>
Mark this question ANSWERED and repost the question in the other forum
Before you post review the Oracle Database Java Developer's Guide - it shows how to create Java stored procedures and has example code
http://docs.oracle.com/cd/B28359_01/java.111/b31225/chfive.htm
And in the new post don't just say "I tried but it didn't work". You need to post the code that you tried and what you mean by "didn't work".
If you got any exceptions or errors you need to post a copy of the exact message or error that you are getting.

Java Stored Procedure / connection JDBC / Server Side / Client Side

Hi,
I would like to know if we can know at the runtime with a JDBC api if the stored procedure is running in client side or in server side ?
THANKS

You wrote
"Java stored procedures -- by definition - are stored in the 8i rdbms. !!"
From the Oracle8i Java Stored Procedures Developer's Guide
Release 8.1.5
A64686-01
"If you create Java class files on the client side, you can use loadjava to upload them into the RDBMS. Alternatively, you can upload Java source files and let the Aurora JVM compile them. In most cases, it is best to compile and debug programs on the client side, then upload the class files for final testing within the RDBMS"
This means that you can create shared classes that are used on both the client and server side. The source does not need to reside within the server (according to their documentation). Please also note the following from the Oracle8i JDBC Developer's Guide and Reference Release 8.1.5 A64685-01 for using the getConnection() method on the server:
"If you connect to the database with the DriverManager.getConnection() method, then use the connect string jdbc:oracle:kprb:. For example:
DriverManager.getConnection("jdbc:oracle:kprb:");
Note that you could include a user name and password in the string, but because you are connecting from the server, they would be ignored."
So if you're coding a shared class that is to run on both the client and server side, you might do something like this:
Connection conn =
DriverManager.getConnection(
System.getProperty("oracle.server.version") == null
? "jdbc:oracle:thin:@hostname:1521:ORCL"
: "jdbc:oracle:kprb:"),
"youruserid","yourpassword");
As stated earlier, the userid and password are supposedly ignored for server connections retrieved in this manner. I haven't tried this yet, but it is documented by Oracle.
Regards,
Steve
null

Jdbc and java stored procedures

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