PL/SQL and Java implementation

Hi all,
We need to implement a fast solution for reporting to our existing web application. Application is totally based on stored procedures written in PL/SQL.
We have already java classes for drawing different types of charts
named Chartdirector (http://www.advsofteng.com/)
This library can create chart images in memory.
I have already read about calling java classes from PL/SQL and SQLJ too.
My questions are;
1. Is this safe to include classes to database and create
reports by using loadjava in real life. I mean not in theory, in real life?
2. Is there any experiments of the audience about this method?
3. Would it be any performance problems about this?
4. Should i prefer to use any Java container and jsps instead of this method?
I will continue to research for necessary steps after i could see the light :)
Thank you to all,
Regards,
Gokhan

> 1. Is this safe to include classes to database and create
reports by using loadjava in real life. I mean not in theory, in real life?
Yes.
> 2. Is there any experiments of the audience about this method?
Experiments and actual implementation - yes. It works. Granted, it does not always work as easy as running the Java code from the command line. But it does work.
> 3. Would it be any performance problems about this?
This is a potential problem with any software code.
4. Should i prefer to use any Java container and jsps instead of this method?
To be honest, I prefer not using Java for web graphics as I'm not impressed with the quality and flexibility of the graphs generated. I prefer using (and paying for commercial use) for the JPGraph classes for PHP - and using that from PL/SQL (via Zend Core for Oracle).
Another option is to use SVG and generated SVG directly from PL/SQL. But this requires a browser plugin and SVG also does not look that great. (this is btw what Oracle's HTMLDB does and uses)

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What is the diffrence between package javax.sql and java.sql

Is javax designed for J2EE?
And when to use package javax?

Hi,
What is the diffrence between package javax.sql and java.sql?The JDBC 2.0 & above API is comprised of two packages:
1.The java.sql package and
2.The javax.sql package.
java.sql provides features mostly related to client
side database functionalities where as the javax.sql
package, which adds server-side capabilities.
You automatically get both packages when you download the JavaTM 2 Platform, Standard Edition, Version 1.4 (J2SETM) or the JavaTM 2, Platform Enterprise Edition, Version 1.3 (J2EETM).
For further information on this please visit our website at http://java.sun.com/j2se/1.3/docs/guide/jdbc/index.html
Hope this helps.
Good Luck.
Gayam.Srinivasa Reddy
Developer Technical Support
Sun Micro Systems
http://www.sun.com/developers/support/

Partner Application written in other language than PL/SQL and Java

I have an application written in another language than PL/SQL or Java. I want to integrate this application as an Partner apps where I use the same user repository as Portal.
Can I integrate the application by calling a stored PL/SQL-procedure based on the PLSQL SSO APIs examples that authenticates the user based on the username/password in portal and redirects the user to the application ?
Are there any examples / references where this has been done ?
Jens

Check out the PDK referance for URL-Services, which allow you to integrate with any web based service/content.
http://portalstudio.oracle.com/servlet/page?_pageid=350&_dad=ops&_schema=OPSTUDIO

PL/SQL and Java Swing interface

Everybody in this forum knows that Oracle is the best database around
with many functionalities, stability, performance, etc. We also know
that PL/SQL is a great language to manipulate information directly
in the database with many built in functions, OOP capability,
transaction control, among other features. Today an application that
manipulates information, which needs user interface, requires components
to be developed using different technologies and normally running in
different servers or machines. For example, the interface is done using
a dynamic HTML generator like JSP, PHP, PL/SQL Web Toolkit, etc.
This page is executed in an application server like Oracle iAS or
Tomcat, just to name two, which in turn access a database like Oracle to
build the HTML. Also rich clients like Java applets require an intermediate
server to access the database (through servlets for example) although
it is possible to access the database directly but with security issues.
Another problem with this is that complexity increases a lot, many
technologies, skills and places to maintain code which leads to a greater
failure probability. Also, an application is constantly evolving, new
calculations are added, new tables, changed columns. If you have an
application with product code for example and you need to increase its
size, you need to change it in the database, search for all occurrences
of it in the middle-tier code and perhaps adjust interfaces. Normally
there is no direct dependency among the tier components. On another
issue, many application interfaces today are based on HTML which doesn't
have interactive capabilities like rich-client interfaces. Although it
is possible to simulate many GUI widgets with JavaScript and DHTML, it is
far from the interactive level we can accomplish in rich clients like
Java Swing, Flash MX, Win32, etc. HTML is also a "tag-based" language
originally created to publish documents so even small pages require
many bytes to be transmitted, far beyond of what we see on the screen.
Even in fast networks you have a delay time to wait the page to be
loaded. Another issue, the database is in general the central location
for all kinds of data. Most applications relies on it for security,
transaction and availability. My proposal is to use Oracle as the
central location for interface, processing and data. With this approach
we can create not only the data manipulation procedures in the database,
but procedures that also control and manage user interfaces. Having
a Oracle database as the central location for all components has many
advantages:
- Unique point of maintenance, backup and restore
- Integrated database security
- One language for everything, PL/SQL or Java (even both if desired)
- Inherited database cache, transaction and processing optimizations
- Direct access to the database dictionary
- Application runs on Oracle which has support for many platforms.
- Transparent use of parallel processing, clusters and future
background technologies
Regarding the interface, I already created a Java applet renderer
which receives instructions from the database on how to create GUI
objects and how to respond to events. The applet is only 8kb and can
render any Swing or AWT object/event. The communication is done
through HTTP or HTTPS using Oracles's MOD_PLSQL included in the Apache
HTTP server which comes with the database or application server (iAS).
I am also creating a database framework and APIs in PL/SQL to
create and manipulate the client interface. The applet startup is
very fast because it is very small, you don't need to download large
classes with the client interface. Execution is done "on-demand"
according to instructions received from the database. The instructions
are very optimized in terms of network bandwidth and based on preliminary
tests it can be up to 1/10 of a similar HTML screen. Less network usage
means faster response and means that even low speed connections will
have a good performance (a future development can be to use this in
wireless devices like PDAs e even cell phones, just an idea for now).
The applet can also be executed standalone by using Java Web Start.
With this approach no business code, except the interface, is executed
on the client. This means that alterations in the application are
dynamically reflected in the client, no need to "re-download" the
application. Events are transmitted when required only so network
usage is minimized. It is also possible to establish triggering
events to further reduce network usage. Since the protocol used is
HTTP (which is stateless), the database framework I am creating will
be responsible to maintain the state of connections, variables, locks
and session information, so the developer don't need to worry about it.
The framework will have many layers, from communication up to
application so there will be pre-built functions to handle queries,
pagination, lock, mail, log, etc. The final objective is to have a
rich client application integrated into the database with minimum
programming and maintenance requirements, not forgetting customization
capabilities. Below is a very small example of what can de done. A
desktop with two windows, each window with two fields, a button with an
image to switch the values, and events to convert the typed text when
leaving the field or double-clicking it. The "leave" event also has an
optimization to only be triggered when the text changes. I am still
developing the framework and adjusting the renderer but I think that all
technical barriers were transposed by now. The framework is still in
the early stages, my guess is that only 5% is done so far. As a future
development even an IDE can be created so we have a graphical environment
do develop applications. I am willing to share this with the PL/SQL
community and listen to ideas and comments.
Example:
create or replace procedure demo1 (
jre_version in varchar2 := '1.4.2_01',
debug_info in varchar2 := 'false',
compress_buffer in varchar2 := 'false',
optimize_buffer in varchar2 := 'true'
) as
begin
interface.initialize('demo1_init','JGR Demo 1',jre_version,debug_info,compress_buffer,optimize_buffer);
end;
create or replace procedure demo1_init as
begin
toolkit.initialize;
toolkit.create_icon('icon',interface.global_root_url||'img/switch.gif');
toolkit.create_internal_frame('frame1','Frame 1',50,50,300,136);
toolkit.create_label('frame1label1','frame1',10,10,50,20,'Field 1');
toolkit.create_label('frame1label2','frame1',10,40,50,20,'Field 2');
toolkit.create_text_field('frame1field1','frame1',50,10,230,20,'Field 1','Field 1',focus_event=>true,mouse_event=>true);
toolkit.create_text_field('frame1field2','frame1',50,40,230,20,'Field 2','Field 2',focus_event=>true,mouse_event=>true);
toolkit.set_text_field_event('frame1field1',toolkit.focus_lost_event,'demo1_set_upper',toolkit.get_text_method,'FIELD 1','false');
toolkit.set_text_field_event('frame1field2',toolkit.focus_lost_event,'demo1_set_upper',toolkit.get_text_method,'FIELD 2','false');
toolkit.set_text_field_event('frame1field1',toolkit.mouse_double_clicked_event,'demo1_set_lower',toolkit.get_text_method,'field 1','false');
toolkit.set_text_field_event('frame1field2',toolkit.mouse_double_clicked_event,'demo1_set_lower',toolkit.get_text_method,'field 2','false');
toolkit.create_button('button1','frame1',10,70,100,25,'Switch','Switch the values of "Field 1" and "Field 2"','S','icon');
toolkit.set_button_event('button1',toolkit.action_performed_event,'demo1_switch_fields(''frame1field1'',''frame1field2'')','frame1field1:'||toolkit.get_text_method||',frame1field2:'||toolkit.get_text_method);
toolkit.create_internal_frame('frame2','Frame 2',100,100,300,136);
toolkit.create_label('frame2label1','frame2',10,10,50,20,'Field 1');
toolkit.create_label('frame2label2','frame2',10,40,50,20,'Field 2');
toolkit.create_text_field('frame2field1','frame2',50,10,230,20,'Field 1','Field 1',focus_event=>true,mouse_event=>true);
toolkit.create_text_field('frame2field2','frame2',50,40,230,20,'Field 2','Field 2',focus_event=>true,mouse_event=>true);
toolkit.set_text_field_event('frame2field1',toolkit.focus_lost_event,'demo1_set_upper',toolkit.get_text_method,'FIELD 1','false');
toolkit.set_text_field_event('frame2field2',toolkit.focus_lost_event,'demo1_set_upper',toolkit.get_text_method,'FIELD 2','false');
toolkit.set_text_field_event('frame2field1',toolkit.mouse_double_clicked_event,'demo1_set_lower',toolkit.get_text_method,'field 1','false');
toolkit.set_text_field_event('frame2field2',toolkit.mouse_double_clicked_event,'demo1_set_lower',toolkit.get_text_method,'field 2','false');
toolkit.create_button('button2','frame2',10,70,100,25,'Switch','Switch the values of "Field 1" and "Field 2"','S','icon');
toolkit.set_button_event('button2',toolkit.action_performed_event,'demo1_switch_fields(''frame2field1'',''frame2field2'')','frame2field1:'||toolkit.get_text_method||',frame2field2:'||toolkit.get_text_method);
end;
create or replace procedure demo1_set_upper as
begin
toolkit.set_string_method(interface.global_object_name,toolkit.set_text_method,upper(interface.array_event_value(1)));
toolkit.set_text_field_event(interface.global_object_name,toolkit.focus_lost_event,'demo1_set_upper',toolkit.get_text_method,upper(interface.array_event_value(1)),'false');
end;
create or replace procedure demo1_set_lower as
begin
toolkit.set_string_method(interface.global_object_name,toolkit.set_text_method,lower(interface.array_event_value(1)));
toolkit.set_text_field_event(interface.global_object_name,toolkit.mouse_double_clicked_event,'demo1_set_lower',toolkit.get_text_method,lower(interface.array_event_value(1)),'false');
end;
create or replace procedure demo1_switch_fields (
field1 in varchar2,
field2 in varchar2
) as
begin
toolkit.set_string_method(field1,toolkit.set_text_method,interface.array_event_value(2));
toolkit.set_string_method(field2,toolkit.set_text_method,interface.array_event_value(1));
toolkit.set_text_field_event(field1,toolkit.focus_lost_event,'demo1_set_upper',toolkit.get_text_method,upper(interface.array_event_value(2)),'false');
toolkit.set_text_field_event(field2,toolkit.focus_lost_event,'demo1_set_upper',toolkit.get_text_method,upper(interface.array_event_value(1)),'false');
toolkit.set_text_field_event(field1,toolkit.mouse_double_clicked_event,'demo1_set_lower',toolkit.get_text_method,lower(interface.array_event_value(2)),'false');
toolkit.set_text_field_event(field2,toolkit.mouse_double_clicked_event,'demo1_set_lower',toolkit.get_text_method,lower(interface.array_event_value(1)),'false');
end;

Is it sound like Oracle Portal?
But you want to save a layer 9iAS.
Basically, that was the WebDB.(Oracle changed the name to Portal when version 3.0)
Over all, I agree with you.
>>Having a Oracle database as the central location for all components has many
>>advantages:
>>
>>- Unique point of maintenance, backup and restore
>>- Integrated database security
>>- One language for everything, PL/SQL or Java (even both if desired)
>>- Inherited database cache, transaction and processing optimizations
>>- Direct access to the database dictionary
>>- Application runs on Oracle which has support for many platforms.
>>- Transparent use of parallel processing, clusters and future
>>background technologies
I would like to build 'ZOPE' inside Oracle DB as a back-end
Using Flash MX as front-end.
Thomas Ku.

Syntax errors using sql and java

Could somebody inform of the correct syntax for using UPDATE and INSERT SQL commands in a java program? Any information I can find demonstrates this with:
INSERT INTO table_name(column_name, ..., column_name)
VALUES(value, ..., value)
However - this isn't working? any suggestions - and I know its very basic, but I'm just learning.
String query = " INSERT INTO SESSIONS (" +
                    "id,module_name, module_number, level, session " +
                    "term, class_list, location, lecturer" + ")
VALUES('"+
                    fields.id.getText() + "', '"+
                    fields.module_name.getText() + "', '" + fields.module_number.getText() + "', '" +
               fields.level.getText() + "', '" fields.session.getText() "', '" +
               fields.term.getText() + "', '" fields.class_list.getText() "', '" +
               fields.location.getText() + "', '" fields.lecturer.getText() "')";
          output.append( " \nSending query: " + connection.nativeSQL(query)+ "\n");
          output.append( "query sent");
thanks
          int result = statement.executeUpdate(query);

With all those quotes and apostrophes and string concatenations, I'd be surprised if you got it right by the fourth try. (By the way, you appear to have missed a comma between "session" and "term".) Are you planning to insert more than one record in your program? If so, you should consider using a PreparedStatement. This will likely run faster, and your program will definitely be easier to read. Also, you won't have to come back here later to ask how you deal with data that includes apostrophes (the notorious "O'Brien" problem). Here's how you do that... you define the PreparedStatement only once:
String query =
"INSERT INTO SESSIONS (id,module_name, module_number, level, session, term, class_list, location, lecturer) " +
"VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?)";
PreparedStatement insert = connection.prepareStatement(query);and then every time you want to insert a record you do this:
insert.setString(1, fields.id.getText());
insert.setString(2, fields.module_name.getText());
// and so on...
insert.executeQuery();

String with new lines in sql and java

i'm using mysql as my database. In one of the columns (nameCol) stores a string, 'hello, my name is earl'
In my java app i want to display this in a text area so that it looks like:
hello,
my name is earl
in mysql i did: INSERT INTO Table (......,nameCol) VALUES(.....,'hello,\nmy name is earl'); This inserted the data into the database in the format i wanted (as above) but when i printed it in my app it came out like hello, my name is earl.
My sample code:
//some code above to set a parameter for a select statement to get a unique row
//get data from the nameCol field ..this all works fine
String nameC = (String)nameDataProvider.getValue("Table.nameCol");
//set the text area
myTextArea.setText(nameC);Anyone know how i can get it to display in the format at the top?

Well, one reason for that is that \n not necessarily leads to a line wrap. Wrap chars are system dependant. Try using System.getProperty("line.separator") instead.

Managing escape characters in SQL and Java

Hello All,
How can I manage special characters(ESPECIALLY single quotes) in my select statements?? If I have to query the database for the rows with name O'brain for example, I am writing a query
String SQL = "SELECT Name FROM MyTable where Name like 'O/'brain%' {escape '/'}";
But this is not working for me. I am using Sybase database. Can anyone help me out with this ?? I don't want to use prepared statements.
Thanks & Regards,
Sarada.

This might sort you out:
http://jregex.sourceforge.net/gstarted.html#appendix-d

Integration of PL/SQL and JSP (Java Server Pages)

I need to match a web application developed with PL/SQL with another developed in JSP (Java Server Pages) the problem is that the two apps interact with the same databese, an share de same users, I need to know how to get the user and password loged into pl/sql when the user want to use same of de .jsp pages running on another application server?

Hi Michael Vstling,
Did you try the java classes library (SDOAPI) that can be downloaded from OTN?
It may provide you with a better alternative when manipulating geometries in the Java space. There is an adapter in SDOAPI which can convert a JDBC STRUCT object into Java Geometry object defined in SDOAPI, and vice versa.
There are at least two ways in mixing PL/SQL and Java. The first one, as you mentioned, is to define your custom function in terms of PL/SQL and call it from within your Java program. With SDOAPI, you have the second option, which is to define your own functions in Java using SDOAPI and deploy them as Java stored procedures in db. You can then call them from within your PL/SQL code. In either way performance depends on a lot of things and generally it requires a "try and improve" approach.
About JPublisher and sdo_ordinate_array it may not be a spatial related problem. Did you try search the Java-related forums first?
LJ

Trying to Find Sample Java Implementation for GATE Information Extractor

I would like to semantically index a large repository of unstructured documents (over a million) using a GATE
Information Extractor, as described in chapter 4 of the Oracle
Semantic Technologies Developers Guide 11g Release 2 (E11828-08).
Page 4-11 states:
"A sample Java implementation for the GATE listener is available for
download from the code samples and examples page on OTN (see Section
1.10, "Semantic Data Examples (PL/SQL and Java)" for information about
this page)."
I followed the link and downloaded the sample code, but I can't seem
to identify any GATE code inside it, or any installation instructions
for the GATE Information Extractor. Are you familiar with it? Any
guidance would be appreciated.

You are openning a direct connection to the DB. A Java Applet is restricted in what it is allowed to do, and it can only open connections to the machine it was downloaded from.
If you are running the .html file straight from the File System, try downloading the applet from a webserver running on the same machine as the DB.
This should solve your problem.
Regards,
Manuel Amago.

How to generate XML from relational data : PL/SQL or Java

I'm new to Oracle XML and would appreciate some advice. I've been asked to generate XML documents from data stored in relational tables. The XML documents must be validated against a DTD. We will probably want to store the XML in the database.
I've seen a PL/SQL based approach as follows :
1.Mimic the structure of the DTD using SQL object types 2.Assign the relational data to the object type using PL/SQL as required
3.Use the SYS_XMLGEN package to render the required XML documents from the SQL objects
However, creating the object types seems to be quite time consuming (step 1 above) for anything other than the simplest of XML documents.
I've also seen that there is the Java based approach, namely :
1. Use the XML generator to build Java classes based on a DTD.
2. Use these classes to build the required XML
On the face of it, the Java based approach seems simpler. However, I'm not that familiar with Java.
Which is the best way to proceed ? Is the PL/SQL based approach worth pursuing or should I bite the bullet and brush up my Java ?
Is it possible to use a combination of PL/SQL and Java to populate the dtd generated java classes (step 2 of the Java approach) to reduce my learning curve ?
Thanks in advance

To help answer your questions:
1) Now, in 9iR2, you can use SQL/XML as another choice.
2) You can also use XSU to generate the XML and use XSLT to transform it to a desired format instead of using object views if possible.
3) XDK provide Class generator support to populate XML data to Java classes.

Forms and Java

Hello,
I have written a Java program that I want to call from a forms program. My form is written in the latest version of Oracle Forms Builder. My logic in the Java class is a common functionality that I want to use in many forms in my application. This functionality is written in Java because PL/SQL does not have functionality for that logic.
By the way, I have an additional question regarding PL/SQL and Java classes. Suppose I want to write common functionality that accesses my database with SQL statement. Which technology is best for performance? Is it Java or PL/SQL? My guess is PL/SQL?!

I have now found the FORMS90_BUILDER_CLASSPATH in the registry. I have added my Jar file at the end of the FORMS90_BUILDER_CLASSPATH like this;
C:\OraHome_1\forms90\java\javacode.jar. Then I restarted my computer.
My javacode listed in the jar file is not available in the import java dialog in forms builder. Is there something else I should do? The only thing that I have done is the changes on the FORMS90_BUILDER_CLASSPATH. Maybe it is something in my Java code? My Jave code is an common Java class with only standard Java import statements.

Datasource, POJO and java.sql.Blob

Hello,
is "java.sql.Blob" a valid type for a POJO datasource ?
I declared one but I just dit not succeed in rendering its jpg picture.
My java code is quite simple :
ReportClientDocument reportClientDocument = new ReportClientDocument ();
reportClientDocument.setReportAppServer(ReportClientDocument.inprocConnectionString);
reportClientDocument.open (REPORT_NAME, OpenReportOptions._openAsReadOnly);
// lBlob is a class which implements java.sql.Blob interface
LPOJOData [] dataP = {new LPOJOData(new lBlob("Picture.jpg"))};
POJOResultSetFactory factory = new POJOResultSetFactory(LPOJOData.class);
POJOResultSet resultSet = factory.createResultSet(dataP);
reportClientDocument.getDatabaseController().setDataSource(resultSet, "", "");
and my POJO class :
public class LPOJOData {
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          public LPOJOData(java.sql.Blob zp){
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The field "zimage" on the report is designed through a "field definition only" database, zimage is defined as a Blob field.
Any clues ?
Regards,
Serge

I have just found a list of the data types supported by a POJO Class :
# boolean
# byte
# char
# double
# float
# int
# short
# java.lang.Boolean
# java.lang.Byte
# java.lang.Double
# java.lang.Float
# java.lang.Integer
# java.lang.Short
# java.lang.String
# java.SQL.Date
# java.SQL.Time
Well, java.SQL.Blob is not one of them.
Is java.SQL_Blob will be a valid POJO type in the future ?
Is there another way than POJO to feed a report from an in-memory datasource ?

PL/SQL support Java and VB

We are exploring the possibility of one Oracle DB supporting
both Application written in VB and Java. Do I have to write two
sets of PL/SQL stored procedures/packages so that one will work
with VB codes through OraOLEDB and the other set will support
Java through JDBC?
I appreciate any of your inputs.
Lisa

I think one version of the PL/SQL stored procedure will serve
both VB and Java programs. With Java JDBC, you can also load a
Java stored procedure into the database and then publish it so
that it can be called from another PL/SQL function, of couse in
this case, the Java stored procedure will have a version
different from that used by VB. Hope that this helps.
Good Luck!
Ming Xu.

Java.sql.Date and java.util.Date - class loaded first in the classpath

I had two jar files which has java.util.Date and java.sql.Date class file. i want to know whether which class is loaded first in the classpath...
I like to change the order of loading the class at runtime...
Is there is any way to change the order of loading of class...
I may have different version of jar files for example xerces,xercesImpl. some of the code uses xerces ,some of the code uses xercesImpl..i had common classes.
I like to load the class with the same name according to the order i need..
Can we do all these in Run time ?????

I had two jar files which has java.util.Date and
java.sql.Date class file. i want to know whether
which class is loaded first in the classpath...
I like to change the order of loading the class at
runtime...
Is there is any way to change the order of loading of
class...
I may have different version of jar files for example
xerces,xercesImpl. some of the code uses xerces ,some
of the code uses xercesImpl..i had common classes.
I like to load the class with the same name according
to the order i need..
Can we do all these in Run time ?????That is meaningless.
The classes you are referring to are part of the Java API. Third party jars have no impact on that. And you can't change to the order because java.sql.Data is derived from java.util.Date. So the second must load before the first.
And if you have two jar files with those classes in them (and not classes that use them) then you either should already know how to use them or you should stop trying to do whatever you are doing because it isn't going to work.

Java.util.Date and java.sql.Date

when i am trying to displaying date in my jsp page errors occurs saying that java.util.date and java.sql.date are matching..
i have some sql statements which i need to execute in the page.so i cant delete that import sql statement.
so what is the solution for this.
i want to display the date as 19th april 2003....in the jsp page.
thank u

You should use full names.
java.util.Date date;
java.sql.Date sdate;
..And it may be a good idea to delete one of the two "import" declaration of packages.

PL/SQL and Java implementation

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