JSP and Oracle Triggers

I have an ON INSERT trigger for a table.
Since it will be automatically triggered
upon any insert statement, and if I am not
wrong, triggers can't return any values.
Is there anyway that in my calling JSP,
I can know of whether the INSERT is successfully or not???
So that I can direct the user to the appropriate page???
Thanks...

If your insert fails you will get an exception which will be returned as an error to your JSP code.
If you want to trap "soft" errors that don't cause an Oracle error, you can check for the condition in the trigger and use raise_application_error to let the caller know it failed.

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Storing / Retrieving PDF using JSP and Oracle

Dear All
I am building web application using Macromedia Dreamweaver , using JSP , Tomcat and Oracle 10gR1.
I need to build a JSP to upload a PDF file to the database and have a way to retrieve it from the database ,, all through JSP .
I need hints about the building architecture and how it is done ,, samples of code will be great.
Thank You Very Much

Use JSP, Servlet and some third party API (Apache Common File Upload) to store the PDF document in blob column.
--Balaji S

Database locking using JSP and Oracle database

Dear All
I am reading about how to do database locking in general and i want to implement these mechanisms using JSP pages and oracle database, but i have the following questions:-
1.If i write a “select for update” quesry in the JSP page will it locks the record ? or it will not lock the record because the connection between the JSP pages and the server will be stateless in most online systems?
2.If i write all my jave code in transaction , something like this:-
• Begin transaction
• Commit or
• Rollback
Then should i be worried about the locking issues or the database manger will handle the locking mechanisms to insure data integrity(and what the default mechanism (if any) that the oracle database manger use to do the locking)?
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BR

One way to solve this issue is as follows:
* You add a new column to each database table called 'version' which is of int type.
* Each time you alter any field in a record, you increament the version number.
* When you read a record and display it, you store the version number in your code
* when you go to update the record, you write your sql something like this:
update person set firstName=? where personId=? and version=?
Where the version is whatever you stored locally. If someone altered the record in the database while your
end user was looking at it, the version numbers will not match and the sql statement will
return zero as the number of records it altered. If its zero, inform the end user someone altered the record
while he was looking at it and weather or not he wants to proceed.
The chances of two people altering the same record in a table while both are logged in and viewing the same set of data is small so such collisions will be few.
You only need transactions if you are updating more than one record at a time (in the same table or multiple tables).
You dont need it for reading records if you use a single sql statement to read (for example: to join multiple tables).
In general, you get a (pooled) connection, use it, and close it as quickly as possible in a try/catch/finally block. You dont hold onto it for the duration of the user's session. A book on JDBC should help clarify this.

JSP and Oracle "LONG" type

I am trying to get the data from a LONG-Type field into the JSP
page.
When I write the rs.getObject(columnName), or
rs.getAsciiStream(columnName), or
rs.getString(columnName)
I would always get the following SQL error message: "Stream has
already been closed".
Do you know how to retrive the LONG data type from the results
Set?
Thank you.

Did you get any reply to this one? I am having the same problem.
Please e-mail me at [email protected]
Thanks
Madhu

How do you handle long strings between JSP forms and Oracle?

I am using Apache 1.3.12 with JServ 1.1 and Oracle 8.0.4 on NT4 development Server.
I am developing an application where one component allows authors to contribute articles or comments via a JSP page. I am noticing a problem when the info in the form gets too long (> 2000 characters). 99% of the inserts fall well within this limitation. The remaining 1% is sufficiently significant that I can't use a VARCHAR. It seems that SQL*NET chokes on large strings.
My immediate workaround for these messages is to break them up into segments. Instead of storing the text or a message directly in a message table, I've added another table, msg_text, with columns msg_id, seg_num, and seg_text. On insert the message is split into segments limited to the smaller of the query limit and database varchar limit, minus the overhead of the sql query. This makes for an ugly insert operation, though and I would very interested to see if anyone out there has a better way to accomplish this task directly with CLOBs.

The apparent problem with LONGs is that, of course, you can only have one per table.
I had exactly this problem and ended up with several tables for one Business Entity, which is not really satisfactory.
For the next phase of the Project, I will investigate:
Putting these tables into a View.
Putting Instead Of triggers on the View to "synchronise" changes to all underlying tables.
Basing my BC4J Entity Object on the View...
... and I hope that Bob will be my uncle.
I'd be interested to hear from anyone who has already tried this, or you if you give it a go.
Rich

How to create two level dynamic list using JSP , Java Script and Oracle

I am new in JSP. And i am facing problem in creating two level dynamic list using JSP ,Java Script where the listdata will come from Oracle 10g express edition database. Is there any easy way in JSP that is available on in ASP.NET.
Plz response with details.

1) Learn JDBC API [http://java.sun.com/docs/books/tutorial/jdbc/index.html].
2) Create DAO class which contains JDBC code and do all SQL queries and returns or takes ID's or DTO objects.
3) Learn Servlet API [http://java.sun.com/javaee/5/docs/tutorial/doc/].
4) Create Servlet class which calls the DAO class, gets the list of DTO's as result, puts it as a request attribute and forwards the request to a JSP page.
5) Learn JSP and JSTL [http://java.sun.com/javaee/5/docs/tutorial/doc/]. Also learn HTML if you even don't know it.
6) Create JSP page which uses the JSTL c:forEach tag to access the list of DTO's and iterate over it and prints a HTML list out.
You don't need Javascript for this.

Need help in JSP and Servlets

Hi friends,
[please forgive me if i am posting this in the wrong forum, all seems same to a fresher]
Now, to my problem..i need a suggestion, a way or a method to implement the following!
I am supposed to create a servlet that reads data from oracle database. Once i retrive the data (for example: 6 rows of a table having 4 attributes), i am supposed to pass this data to a JSP page where the data has to be formatted and displayed properly. If i call the same servlet from a different JSP, i should be able to access the data in that JSP and format it in a different way. How do i pass the data to JSP? what method i can use to achieve this task?
Note: I already know about PrintWriter pw = response.getWriter(); and then printing the formated HTML page..but i want to keep the formatting to JSP part and send only the data part that i can access in JSP
Thanks in adavance

arun_ramachandran wrote:
[please forgive me if i am posting this in the wrong forum, all seems same to a fresher]Then you should learn to be more observant - after all, we have JSP and Servlet fora, further down the list. :)
I am supposed to create a servlet that reads data from oracle database. Once i retrive the data (for example: 6 rows of a table having 4 attributes), i am supposed to pass this data to a JSP page where the data has to be formatted and displayed properly. If i call the same servlet from a different JSP, i should be able to access the data in that JSP and format it in a different way. How do i pass the data to JSP? what method i can use to achieve this task? You can store the data in your session object. You can even use JavaBeans and the jsp:usebean tag.
[http://java.sun.com/products/jsp/tags/11/syntaxref11.fm14.html]
Note: I already know about PrintWriter pw = response.getWriter(); and then printing the formated HTML page..but i want to keep the formatting to JSP part and send only the data part that i can access in JSPA wise approach - I wish more prople woiuld be as thoughtful.

Help building an e-commerce site using DreamWeaver MX 2004 and Oracle 10G

I'm new to using Oracle 10G. After reviewing several rdms's I've picked Oracle 10G as my rdms. I'm trying to build an ecommerce site using DreamWeaver MX 2004 and Oracle 10G. The website will be selling hardware and software products. I have a choice in DreamWeaver to go for a .asp or .jsp setup. I have several questions, here goes:
1. Is there any book/tutorial/whitepaper out there that describes building an ecommerce site using Oracle 10G/9I/8I? Just some examples as how to make the datamodel regarding the shopping basket etc.
2. I prefer DreamWeaver as it let's me make nice looking css style based pages without throttling too much through the code. Are there Oracle tools which allow me to make an advanced nice looking ecommerce site?
I hope some of you can help me get started. Any effort is appreciated.
Cheers

I'm new to using Oracle 10G. After reviewing several rdms's I've picked Oracle 10G as my rdms. I'm trying to build an ecommerce site using DreamWeaver MX 2004 and Oracle 10G. The website will be selling hardware and software products. I have a choice in DreamWeaver to go for a .asp or .jsp setup. I have several questions, here goes:
1. Is there any book/tutorial/whitepaper out there that describes building an ecommerce site using Oracle 10G/9I/8I? Just some examples as how to make the datamodel regarding the shopping basket etc.
2. I prefer DreamWeaver as it let's me make nice looking css style based pages without throttling too much through the code. Are there Oracle tools which allow me to make an advanced nice looking ecommerce site?
I hope some of you can help me get started. Any effort is appreciated.
Cheers

How to handle external tag-libraries in JSPs using Oracle Stellent?

I have already started the execution of JSP engine in Oracle Stellent, and also could run the sample Tomcat web-application and basic JSPs in Oracle UCM. What I need to do, is to customize my JSP to be able to show/hide some content using Oracle Stellent.
I have a JSP, from web application, which is using some some tag-libraries from spring, etc.
+<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>+
+<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>+
+<%@ taglib uri="http://www.springframework.org/tags" prefix="s"%>+
+<%@ taglib prefix="security"+
uri="http://www.springframework.org/security/tags"%>
+<%@taglib uri="http://www.springframework.org/tags" prefix="s"%>+
+<%@ page import = "idcserver.*" %>+
+<jsp:useBean id="sb" class="idcserver.ServerBean" />+
+<%+
sb.init(request);
....and so on
I have checked in the above file, and when trying to preview in Oracle UCM, I get the following error:
Content Server Request Failed
+!csStellentTomcatErrorWhileProcessing,/idca/groups/jsp/documents/pix/11.jspThe absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application:org.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application+
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(Unknown Source)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(Unknown Source)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(Unknown Source)
at org.apache.jasper.compiler.TagLibraryInfoImpl.generateTLDLocation(Unknown Source)
at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(Unknown Source)
at org.apache.jasper.compiler.Parser.parseTaglibDirective(Unknown Source)
at org.apache.jasper.compiler.Parser.parseDirective(Unknown Source)
at org.apache.jasper.compiler.Parser.parseElements(Unknown Source)
at org.apache.jasper.compiler.Parser.parse(Unknown Source)
at org.apache.jasper.compiler.ParserController.doParse(Unknown Source)
at org.apache.jasper.compiler.ParserController.parse(Unknown Source)
at org.apache.jasper.compiler.Compiler.generateJava(Unknown Source)
at org.apache.jasper.compiler.Compiler.compile(Unknown Source)
at org.apache.jasper.compiler.Compiler.compile(Unknown Source)
at org.apache.jasper.compiler.Compiler.compile(Unknown Source)
at org.apache.jasper.JspCompilationContext.compile(Unknown Source)
at org.apache.jasper.servlet.JspServletWrapper.service(Unknown Source)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(Unknown Source)
at org.apache.jasper.servlet.JspServlet.service(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:861)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(Unknown Source)
at org.apache.catalina.core.StandardWrapperValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardValveContext.invokeNext(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.StandardContextValve.invokeInternal(Unknown Source)
at org.apache.catalina.core.StandardContextValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardValveContext.invokeNext(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.StandardHostValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardValveContext.invokeNext(Unknown Source)
at org.apache.catalina.valves.ErrorReportValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardValveContext.invokeNext(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.StandardEngineValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardValveContext.invokeNext(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(Unknown Source)
at tomcatprovider.StellentProtocol$StellentWorkThread.runIt(StellentProtocol.java:304)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(Unknown Source)
at java.lang.Thread.run(Thread.java:595)
Edited by: 980473 on Jan 8, 2013 2:01 AM

Hi ,
Check if you have jstil.jar in WEB-INF/lib location , if missing manually add jstl.jar into WEB-INF/lib restart UCM Managed server .
Hope this helps.
Thanks,
Srinath

PDF PRINTING using Apache FOP and Oracle Containers for J2EE

Hi,
I am having major confusion about the pdf printing in Oracle XE and Apex 3.1.2.00.02
It clearly states that this is an available option on the Oracle website.
According to Apex there are two options for printing report regions.
Standard - which is free
Advanced - which uses BI and requires a licence
Standard requires me to have Apache FOP (which is provided by Oracle in the Apex release) and Oracle Containers for J2EE (OC4J)
Where my understanding of all this falls down is the part where I am downloading the Oracle Containers for J2EE and the license agreement states this cannot be used in a production system (only as a protptype). Can anyone clarify this? This is surely a required componenet and for the standard report printing which is supposed to be free.
My problem is that I need to have a database system on a laptop that will go off site for a number of weeks. We need report printing options.
Can anyone help with this. im desperate.
Kind regards
colin mclay

no not yet with Application Server.
I have tried to compare the settings to another installation with a separeted oc4j as described in the howto. But at the moment i found no mistakes.
If i call the url adresse like:
http://localhost:18101/fop/apex_fop.jsp
i get:
500 Internal Server Error
Servlet error: java.lang.ClassNotFoundException: fop.apex__fop
I installed it another time with these settings:
Web Anwendung= .../fop.war (selected war file from apex install directory)
Anwendungsname= fop
URL zuordnen= /fop
I would like to know if its possible to use the fop.war out of apex install directory with the Application server? In the standalone version (as described in howto) it works. But if you install it there you don't need to define an URL.
Is the URL /fop correct or what do i have to insert there?

Problem in connecting JSP with Oracle 9i.

Hi,
I am having problem in connecting JSP with Oracle 9i.
I am using windows XP and my JDK version is 1.4. For executing JSP I am using
"jakarta-tomcat-5.5.4-preconfigured". My database name is global.
I have set java_home, j2ee_home, oracle_home, path, classpath as follows:
j2ee_home=c:\sun\appserver
java_home=c:\sun\appserver\jdk
oracle_home=C:\oracle\ora92
path=C:\Sun\AppServer\bin;C:\Sun\AppServer\jdk\bin;C:\oracle\ora92\bin
classpath=C:\Sun\AppServer\lib\j2ee.jar;C:\oracle\ora92\jdbc\lib\ojdbc14.jar;C:\oracle\ora92\jdbc\lib\nls_charse
t12.zip
My code is as follows:
<%@ page language="java" %>
<%@ page import ="java.sql.*"%>
<%
try
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
Connection conn = DriverManager.getConnection ("jdbc:oracle:oci8:@global", "scott", "tiger");
catch(SQLException e)
out.println(""+e);
out.println("Connected");
%>
I tried other program:
<%@ page language="java" %>
<%@ page import ="java.sql.*"%>
<%
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:global","scott","tiger");
out.println("Connected");
%>
I am getting following error:
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 5 in the jsp file: /jsp/oracle.jsp
Generated servlet error:
oracle.jdbc.OracleDriver cannot be resolved or is not a type
     org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
     org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:389)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:296)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:245)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
Thanking you in advance,
Anurag

maneesh108 wrote:
hi this is maneesh1) Read the thread it has been answered.
2) The thread is very old. Don't resurrect old threads.
I'm locking this zombie thread.
Kaj

Hi guys Pls tell me a way to connect db4 database with jsp and which driver

hi guys
Pls tell me a way to connect db4 database with jsp and
also tell me which driver i have to use
also tell me how to connect with excel sheets

take a look at the follwing links. There, you'll find all what you need :
DB4:
http://www.oracle.com/database/berkeley-db/je/index.html
http://www.oracle.com/technology/products/berkeley-db/je/index.html
http://www.oracle.com/database/berkeley-db/db/index.html
http://www.oracle.com/database/docs/berkeley-db-je-datasheet.pdf
Excel:
http://64.18.163.122/rgagnon/javadetails/java-0516.html
Hope That Helps

Support of JSP in Oracle 8i

Dear all friends,
now I am using Sun Java Web server for serving my JSP's but I have heared that Oracle 8i support JSP .Could you please inform me that whether Oracle 8.1.5. has webserver itself and if it does ,does it support JSP.
any suggestion would be appreciated
Amirali

Oracle 8.1.7 (due this summer)will indeed have a web server in the database for running servlets and JSPs. Oracle 8.1.5 and 8.1.6 do not have this.
- Servlet Team

SQL and Oracle in synchronization

I have to synchronize for about 2 months one Oracle 9.i database and one SQL server 2000, Standard edition database, both running on Win 2K Server. Every change made on either of the databases (the best is there are only 4-5 tables reflected) has to be provided on the other side almost in real time. I choused to use SQL server as a way to do it. For Oracle I have only the ODBC connectivity (supplied for free) and I did have a lot of problems in ORA 8.1.6... Needless to say, there's no money for third party products or even new ORA transfer utility, as the 2-month are not sufficient time.
I did set up linked servers between SQL server and Oracle and trying to make some triggers working for me, but is this the best way to do it? May be somebody has better experience...
Any ideas will be greatly appreciated.
Thanks,
MJ

Do you really like to implement a two way replication between M$ SQL and Oracle?
Maybe you can try this using the heterogenous gateway and Oracle Advanced replication. Don't know if this could work our test environment would be ready but actually there's no time to try.
Will keep you informed if I know more.
In this way you don't need any third party sw and I think it could work, but never have tried it out.
Could be an interesing challenge ;-)
Michel

After and before triggers

My doubt is about the execution of triggers
I have a table T1
create table T1
+(ID1 number(9,2) primary key,+
NAME1 VARCHAR2(100)) ;
It has following 2 rows.
insert into t1 values (1,'sandeep')
insert into t1 values (2,'tom')
commit;
I have following 4 triggers
create or replace
TRIGGER TRIGGER1_before_statement
before update on T1
begin
dbms_output.put_line('fired before statement');
END;
create or replace
trigger TRIGGER_BEFORE_EACHROW
before update on T1 for each row
begin
DBMS_OUTPUT.PUT_LINE('fired before each row');
END;
create or replace
TRIGGER TRIGGER_after_eachrow
after update ON T1
FOR EACH ROW
begin
DBMS_OUTPUT.PUT_LINE('fired trigger after eachrow');
END;
create or replace
trigger TRIGGER1_AFTER_STATEMENT
after update on T1
begin
dbms_output.put_line('fired after statement');
END;
i ran the following script
SET SERVEROUTPUT ON;
begin
update T1 set T1.ID1=1 where T1.ID1 = 2;
end;
This update statement will fail because it violates the primary key constraint on the table.
During execution of the update statement, i expect only the before statement and row triggers to fire because after triggers will be fired after execution of the statement and in this case the update execution has failed.
But the output i am getting is
fired before statement
fired before each row
fired trigger after eachrow
which means the after TRIGGER_after_eachrow has also fired but my update statement has failed and TRIGGER_after_eachrow should fire only after updating the rows.
Why this trigger was fired? If oracle processes all the triggers even if the triggerig statement fails, then why TRIGGER1_AFTER_STATEMENT was not fired.
Thanks in advance.

Hi Sandeep,
While trying to search for the answer to your after trigger execution related issue, I got below from asktom site where I got a discussion regarding the same topic.
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:29259877603106
Below is the exact question post by one member and answer by tom in it.
I thought
Here is some sample which shows that after row statement fires event though the integrity
constraint check should have failed first.
Me and my colleagues are confused with the definition found at
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14220/triggers.htm#sthref3288
drop table emp;
drop table dept;
-- Create table
create table DEPT
ID    NUMBER not null,
name VARCHAR2(100)
alter table DEPT add primary key (ID);
create table EMP
ID      NUMBER not null,
NAME    VARCHAR2(100),
DEPT_ID NUMBER
alter table EMP
add primary key (ID);
alter table EMP
add constraint EMP_DEPT_FK foreign key (DEPT_ID)
references DEPT (ID);
create or replace trigger EMP_AFT_INS_ROW_TRG after insert on emp for each row
declare
    n number;
begin
    select 1 into n from dept where dept.id = :new.dept_id;
exception
    when no_data_found then
        raise_application_error(-20001, 'No such department');
end;
insert into dept(id, name) values (1,'First department');
commit;
insert into emp (id, name, dept_id) values (101, 'First employee', 1);
commit;
rem here I expect a foreign key violation message instead of 'No such department' application error
insert into emp (id, name, dept_id) values (102, 'Second employee', 2);
commit;
Followup   September 5, 2006 - 5pm Central time zone:
constraints technically are validated AFTER the statement executes - it is not really defined
whether a trigger will or will not fire (and if you have logic that depends on such intricate
ordering, we have a really big logic problem)
but a for each row trigger - sure, because tables are allowed to violate their constraints during
the DML, think about this:
update emp set empno = empno+1;
every row updated could temporarily violate uniqueness as there could be two empno =2, empno=3 and
so on as this goes through row by row. May be its useful to you..
Regards,
Dipali..

JSP and Oracle Triggers

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