Re: Question on debuggin JNDI/prepared statement in a bean
Hello
pstmt.setString(1,ClassifiedAd);
pstmt.setString(2,UniqueDateId);
Are those two parameters - 'ClassifiedAd' and 'UniqueDateId' - variables?
They should be, and if so, where do you declare and initialise them? They do
not appear in the method you posted.
Harry
I am frustrated trying to debug a prepared statement within a bean; what
am I doing wrong?; ANY clues appreciatedĀ
It is not throwing any exceptions yet I methodically went over the code;
granted this is the first time I used beans versus servlets.
Can anyone point me to a good example (JNDI, JSP, JavaBean, Resultset)
Code within bean:
private void prepareStatement(){
try{
Context env = (Context) new
InitialContext().lookup(java:comp/env);
pool = (DataSource) env.lookup(jdbc/myDB);
if (pool == null)
throw new NamingException(`jdbc/ myDB ' is an
unknown DataSource);
//dbConnection = null;
dbConnection = pool.getConnection();
String SQLCmd =
select * from AdInfoView where Classification = ?
+ and UniqueDateId ? order by UniqueDateId
desc;
pstmt = dbConnection.prepareStatement(SQLCmd);
// TEST Exception thrown here.
//pstmt.setString(1,searchWord);
pstmt.setString(1,ClassifiedAd);
pstmt.setString(2,UniqueDateId);
}catch(Exception e){
System.err.println(Problem preparing statement +
e.getMessage() + e.getCause());
}
}
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Re: Question on debuggin JNDI/prepared statement in a bean
This topic doesn't really have anything to do with Tomcat so you might have
better luck receiving help on some other mailing list. Anybody know which
list he should be posting to?
What is the actual problem you are having?
Do you execute your prepared statement somewhere?
Adrian
- Original Message -
From: Harry Mantheakis [EMAIL PROTECTED]
To: Tomcat Users List [EMAIL PROTECTED]
Sent: Friday, March 26, 2004 3:28 AM
Subject: Re: Question on debuggin JNDI/prepared statement in a bean
Hello
pstmt.setString(1,ClassifiedAd);
pstmt.setString(2,UniqueDateId);
Are those two parameters - 'ClassifiedAd' and 'UniqueDateId' - variables?
They should be, and if so, where do you declare and initialise them? They do
not appear in the method you posted.
Harry
I am frustrated trying to debug a prepared statement within a bean; what
am I doing wrong?; ANY clues appreciatedS
It is not throwing any exceptions yet I methodically went over the code;
granted this is the first time I used beans versus servlets.
Can anyone point me to a good example (JNDI, JSP, JavaBean, Resultset)
Code within bean:
private void prepareStatement(){
try{
Context env = (Context) new
InitialContext().lookup(java:comp/env);
pool = (DataSource) env.lookup(jdbc/myDB);
if (pool == null)
throw new NamingException(`jdbc/ myDB ' is an
unknown DataSource);
//dbConnection = null;
dbConnection = pool.getConnection();
String SQLCmd =
select * from AdInfoView where Classification = ?
+ and UniqueDateId ? order by UniqueDateId
desc;
pstmt = dbConnection.prepareStatement(SQLCmd);
// TEST Exception thrown here.
//pstmt.setString(1,searchWord);
pstmt.setString(1,ClassifiedAd);
pstmt.setString(2,UniqueDateId);
}catch(Exception e){
System.err.println(Problem preparing statement +
e.getMessage() + e.getCause());
}
}
---
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RE: Question on debuggin JNDI/prepared statement in a bean
Hi,
This is a fine list, and he'd get a ton of help anyways. He should just
mark the subject as [OFF-TOPIC].
Yoav Shapira
Millennium Research Informatics
-Original Message-
From: Adrian Lanning [mailto:[EMAIL PROTECTED]
Sent: Friday, March 26, 2004 7:01 AM
To: Tomcat Users List
Subject: Re: Question on debuggin JNDI/prepared statement in a bean
This topic doesn't really have anything to do with Tomcat so you might
have
better luck receiving help on some other mailing list. Anybody know
which
list he should be posting to?
What is the actual problem you are having?
Do you execute your prepared statement somewhere?
Adrian
- Original Message -
From: Harry Mantheakis [EMAIL PROTECTED]
To: Tomcat Users List [EMAIL PROTECTED]
Sent: Friday, March 26, 2004 3:28 AM
Subject: Re: Question on debuggin JNDI/prepared statement in a bean
Hello
pstmt.setString(1,ClassifiedAd);
pstmt.setString(2,UniqueDateId);
Are those two parameters - 'ClassifiedAd' and 'UniqueDateId' -
variables?
They should be, and if so, where do you declare and initialise them?
They
do
not appear in the method you posted.
Harry
I am frustrated trying to debug a prepared statement within a bean;
what
am I doing wrong?; ANY clues appreciatedS
It is not throwing any exceptions yet I methodically went over the
code;
granted this is the first time I used beans versus servlets.
Can anyone point me to a good example (JNDI, JSP, JavaBean,
Resultset)
Code within bean:
private void prepareStatement(){
try{
Context env = (Context) new
InitialContext().lookup(java:comp/env);
pool = (DataSource) env.lookup(jdbc/myDB);
if (pool == null)
throw new NamingException(`jdbc/ myDB ' is an
unknown DataSource);
//dbConnection = null;
dbConnection = pool.getConnection();
String SQLCmd =
select * from AdInfoView where Classification =
?
+ and UniqueDateId ? order by UniqueDateId
desc;
pstmt = dbConnection.prepareStatement(SQLCmd);
// TEST Exception thrown here.
//pstmt.setString(1,searchWord);
pstmt.setString(1,ClassifiedAd);
pstmt.setString(2,UniqueDateId);
}catch(Exception e){
System.err.println(Problem preparing statement +
e.getMessage() + e.getCause());
}
}
---
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RE: Question on debuggin JNDI/prepared statement in a bean
Harry,
Yes the ClassifiedAd and UniqueDateId are two parameters taken
from an html form, the values of ClassifiedAd and UniqueDateId are used
in a prepared statement for substitution of ? and ? the results are then
forwarded to a results jsp, which used the getXXX() to retrieve the
values from the bean.
I have this code working in another form as a Servlet using JNDI
and prepared statements. In the servlet the JNDI connection is made in
the init(blah, blah) and calls the super.init(config) which I
super.init(config) is implicit from reading the Tomcat docs.
The bottom line on this, is how do you set up a JNDI connection
in a bean, use a prepared statement (in a bean), retrieve a resultset
and forward the result for the results jsp to retrieve the value from
the bean.
Finally, I apologize to those who feel this is off topic. I have similar
code working in Resin but for the life of me, I can't get it working
with Tomcat 5 :-( I searched all the archives and can't find a good
example for doing this.
TIA Tom K.
-Original Message-
From: Harry Mantheakis [mailto:[EMAIL PROTECTED]
Sent: Friday, March 26, 2004 2:29 AM
To: Tomcat Users List
Subject: Re: Question on debuggin JNDI/prepared statement in a bean
Hello
pstmt.setString(1,ClassifiedAd);
pstmt.setString(2,UniqueDateId);
Are those two parameters - 'ClassifiedAd' and 'UniqueDateId' -
variables?
They should be, and if so, where do you declare and initialise them?
They do
not appear in the method you posted.
Harry
I am frustrated trying to debug a prepared statement within a bean;
what
am I doing wrong?; ANY clues appreciated
It is not throwing any exceptions yet I methodically went over the
code;
granted this is the first time I used beans versus servlets.
Can anyone point me to a good example (JNDI, JSP, JavaBean, Resultset)
Code within bean:
private void prepareStatement(){
try{
Context env = (Context) new
InitialContext().lookup(java:comp/env);
pool = (DataSource) env.lookup(jdbc/myDB);
if (pool == null)
throw new NamingException(`jdbc/ myDB ' is an
unknown DataSource);
//dbConnection = null;
dbConnection = pool.getConnection();
String SQLCmd =
select * from AdInfoView where Classification = ?
+ and UniqueDateId ? order by UniqueDateId
desc;
pstmt = dbConnection.prepareStatement(SQLCmd);
// TEST Exception thrown here.
//pstmt.setString(1,searchWord);
pstmt.setString(1,ClassifiedAd);
pstmt.setString(2,UniqueDateId);
}catch(Exception e){
System.err.println(Problem preparing statement +
e.getMessage() + e.getCause());
}
}
---
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Re: Question on debuggin JNDI/prepared statement in a bean
Hey Tom,
When I said your thread was off-topic I didn't mean to imply you couldn't
post your question! Sorry if that's how it came across. Just thought you
should mark it [OT] as Yoav pointed out. It appears I was wrong anyways; I
missed the part about it working in Resin and not in Tomcat.
As for your question, what is it exactly that goes wrong with your app now
that its running under Tomcat and not Resin? Trouble getting the data to
your jsp? Is it not starting up? The code you posted doesn't actually DO
anything so I'm guessing that's just an example you put together to
illustrate what you're trying to do?
Could you post the parts of your Context regarding the jndi resource you are
configuring?
Adrian
- Original Message -
From: Tom K [EMAIL PROTECTED]
To: 'Tomcat Users List' [EMAIL PROTECTED]
Sent: Friday, March 26, 2004 9:41 AM
Subject: RE: Question on debuggin JNDI/prepared statement in a bean
Harry,
Yes the ClassifiedAd and UniqueDateId are two parameters taken
from an html form, the values of ClassifiedAd and UniqueDateId are used
in a prepared statement for substitution of ? and ? the results are then
forwarded to a results jsp, which used the getXXX() to retrieve the
values from the bean.
I have this code working in another form as a Servlet using JNDI
and prepared statements. In the servlet the JNDI connection is made in
the init(blah, blah) and calls the super.init(config) which I
super.init(config) is implicit from reading the Tomcat docs.
The bottom line on this, is how do you set up a JNDI connection
in a bean, use a prepared statement (in a bean), retrieve a resultset
and forward the result for the results jsp to retrieve the value from
the bean.
Finally, I apologize to those who feel this is off topic. I have similar
code working in Resin but for the life of me, I can't get it working
with Tomcat 5 :-( I searched all the archives and can't find a good
example for doing this.
TIA Tom K.
-Original Message-
From: Harry Mantheakis [mailto:[EMAIL PROTECTED]
Sent: Friday, March 26, 2004 2:29 AM
To: Tomcat Users List
Subject: Re: Question on debuggin JNDI/prepared statement in a bean
Hello
pstmt.setString(1,ClassifiedAd);
pstmt.setString(2,UniqueDateId);
Are those two parameters - 'ClassifiedAd' and 'UniqueDateId' -
variables?
They should be, and if so, where do you declare and initialise them?
They do
not appear in the method you posted.
Harry
I am frustrated trying to debug a prepared statement within a bean;
what
am I doing wrong?; ANY clues appreciated
It is not throwing any exceptions yet I methodically went over the
code;
granted this is the first time I used beans versus servlets.
Can anyone point me to a good example (JNDI, JSP, JavaBean, Resultset)
Code within bean:
private void prepareStatement(){
try{
Context env = (Context) new
InitialContext().lookup(java:comp/env);
pool = (DataSource) env.lookup(jdbc/myDB);
if (pool == null)
throw new NamingException(`jdbc/ myDB ' is an
unknown DataSource);
//dbConnection = null;
dbConnection = pool.getConnection();
String SQLCmd =
select * from AdInfoView where Classification = ?
+ and UniqueDateId ? order by UniqueDateId
desc;
pstmt = dbConnection.prepareStatement(SQLCmd);
// TEST Exception thrown here.
//pstmt.setString(1,searchWord);
pstmt.setString(1,ClassifiedAd);
pstmt.setString(2,UniqueDateId);
}catch(Exception e){
System.err.println(Problem preparing statement +
e.getMessage() + e.getCause());
}
}
---
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Re: Question on debuggin JNDI/prepared statement in a bean
Hi Tom how do you set up a JNDI connection in a bean? Exactly the same way as you would anywhere else, so if you have some code working in a servlet, copy it. To be precise, it is a database connection, acquired from a DataSource, which is itself acquired via a JNDI lookup. The fact that your code is in a bean makes no difference. how do you... use a prepared statement (in a bean) Same as anywhere else. how do you... retrieve a resultset, and forward the result Again, same as anywhere else. BTW - you should not be passing about references to JDBC objects that are tethered (so to speak) to database connections - it is bad practice, and likely to cause connection (and memory) leaks. The best thing to do with database connections is, grab your data, store it in some collection object, and then make damn sure you close the db connection - usually within a 'finally' block which is guaranteed to execute, even when exceptions occur. Having stored the data you need in a collection object, you can pass that about as much as you like. That has not really answered your original question, but unless you provide us with all your relevant code we probably cannot solve the problem. Since you got it working before, I would be inclined to start again, making sure that you copy the same JNDI/connection procedures in your 'bean' as in the servlet that works. The fact that your 'bean' is not throwing any exceptions suggests, to me, that there is a bug (logic error) in your code. Starting over might sort that out. Sprinkle about a few (temporary) 'System.out.println' statements to see where your code gets to. Not cool, but they do the job sometimes! If you are using an IDE - like Eclipse - you can run in debug mode, so it's easy to see what is happening - though may be not with JSPs. Good luck. Harry Harry, Yes the ClassifiedAd and UniqueDateId are two parameters taken from an html form, the values of ClassifiedAd and UniqueDateId are used in a prepared statement for substitution of ? and ? the results are then forwarded to a results jsp, which used the getXXX() to retrieve the values from the bean. I have this code working in another form as a Servlet using JNDI and prepared statements. In the servlet the JNDI connection is made in the init(blah, blah) and calls the super.init(config) which I super.init(config) is implicit from reading the Tomcat docs. The bottom line on this, is how do you set up a JNDI connection in a bean, use a prepared statement (in a bean), retrieve a resultset and forward the result for the results jsp to retrieve the value from the bean. Finally, I apologize to those who feel this is off topic. I have similar code working in Resin but for the life of me, I can't get it working with Tomcat 5 :-( I searched all the archives and can't find a good example for doing this. TIA Tom K. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Question on debuggin JNDI/prepared statement in a bean
Not exactly...it is not the same! I have it working with a connection pool, mySQL and JNDI. To keep my reply short it goes like this within the bean: getDBConnection(); // get the connection prepareStatement(); // prepare the statement rs = pstmt.executeQuery(); // execute the query and of course after that I get my parameters. In a servlet you have an init() statement that executes only once which you get your db connection in, also you need to call super.init(config), where you don't have to do this in a bean, because it is implicit. (By the way, if someone wants an example, I will post it, but you'll then be my wife.) Next challenge is I have a blob that I set and get, but when I get the blob on my results page, it comes up with something like this @1eb2473 which I assume is an address. Anyone know what know how to get, what's in the address. Maybe open a stream? TIA Tom K. -Original Message- From: Harry Mantheakis [mailto:[EMAIL PROTECTED] Sent: Friday, March 26, 2004 10:43 AM To: Tomcat Users List Subject: Re: Question on debuggin JNDI/prepared statement in a bean Hi Tom how do you set up a JNDI connection in a bean? Exactly the same way as you would anywhere else, so if you have some code working in a servlet, copy it. To be precise, it is a database connection, acquired from a DataSource, which is itself acquired via a JNDI lookup. The fact that your code is in a bean makes no difference. how do you... use a prepared statement (in a bean) Same as anywhere else. how do you... retrieve a resultset, and forward the result Again, same as anywhere else. BTW - you should not be passing about references to JDBC objects that are tethered (so to speak) to database connections - it is bad practice, and likely to cause connection (and memory) leaks. The best thing to do with database connections is, grab your data, store it in some collection object, and then make damn sure you close the db connection - usually within a 'finally' block which is guaranteed to execute, even when exceptions occur. Having stored the data you need in a collection object, you can pass that about as much as you like. That has not really answered your original question, but unless you provide us with all your relevant code we probably cannot solve the problem. Since you got it working before, I would be inclined to start again, making sure that you copy the same JNDI/connection procedures in your 'bean' as in the servlet that works. The fact that your 'bean' is not throwing any exceptions suggests, to me, that there is a bug (logic error) in your code. Starting over might sort that out. Sprinkle about a few (temporary) 'System.out.println' statements to see where your code gets to. Not cool, but they do the job sometimes! If you are using an IDE - like Eclipse - you can run in debug mode, so it's easy to see what is happening - though may be not with JSPs. Good luck. Harry Harry, Yes the ClassifiedAd and UniqueDateId are two parameters taken from an html form, the values of ClassifiedAd and UniqueDateId are used in a prepared statement for substitution of ? and ? the results are then forwarded to a results jsp, which used the getXXX() to retrieve the values from the bean. I have this code working in another form as a Servlet using JNDI and prepared statements. In the servlet the JNDI connection is made in the init(blah, blah) and calls the super.init(config) which I super.init(config) is implicit from reading the Tomcat docs. The bottom line on this, is how do you set up a JNDI connection in a bean, use a prepared statement (in a bean), retrieve a resultset and forward the result for the results jsp to retrieve the value from the bean. Finally, I apologize to those who feel this is off topic. I have similar code working in Resin but for the life of me, I can't get it working with Tomcat 5 :-( I searched all the archives and can't find a good example for doing this. TIA Tom K. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.557 / Virus Database: 349 - Release Date: 12/30/2003 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.557 / Virus Database: 349 - Release Date: 12/30/2003 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Question on debuggin JNDI/prepared statement in a bean
Tom In a servlet you have an init() statement that executes only once which you get your db connection in... I hope you are not in a fog about this: there is nothing pre-ordained about getting a connection in a servlet init method - that just happens to be where your code is. also you need to call super.init(config), where you don't have to do this in a bean, because it is implicit... Hmm... I think maybe you are in a bit of fog about all this :-) Calling 'super.init( config )' within a servlet's init method has nothing to do with database connections. Anyway, if you are prepared to post the *exact* bean code that is not working for you, I am prepared to look at it and try to help you. Posting snippets of code is not good enough. The alternative is for you to walk through your code (with println statements, or a debugger) and see where it stops working. Next challenge is I have a blob that I set and get, but when I get the blob on my results page, it comes up with... Is that the servlet providing the 'results' - or did you fix the bean? Regards Harry Not exactly...it is not the same! I have it working with a connection pool, mySQL and JNDI. To keep my reply short it goes like this within the bean: getDBConnection(); // get the connection prepareStatement(); // prepare the statement rs = pstmt.executeQuery();// execute the query and of course after that I get my parameters. In a servlet you have an init() statement that executes only once which you get your db connection in, also you need to call super.init(config), where you don't have to do this in a bean, because it is implicit. (By the way, if someone wants an example, I will post it, but you'll then be my wife.) Next challenge is I have a blob that I set and get, but when I get the blob on my results page, it comes up with something like this @1eb2473 which I assume is an address. Anyone know what know how to get, what's in the address. Maybe open a stream? TIA Tom K. -Original Message- From: Harry Mantheakis [mailto:[EMAIL PROTECTED] Sent: Friday, March 26, 2004 10:43 AM To: Tomcat Users List Subject: Re: Question on debuggin JNDI/prepared statement in a bean Hi Tom how do you set up a JNDI connection in a bean? Exactly the same way as you would anywhere else, so if you have some code working in a servlet, copy it. To be precise, it is a database connection, acquired from a DataSource, which is itself acquired via a JNDI lookup. The fact that your code is in a bean makes no difference. how do you... use a prepared statement (in a bean) Same as anywhere else. how do you... retrieve a resultset, and forward the result Again, same as anywhere else. BTW - you should not be passing about references to JDBC objects that are tethered (so to speak) to database connections - it is bad practice, and likely to cause connection (and memory) leaks. The best thing to do with database connections is, grab your data, store it in some collection object, and then make damn sure you close the db connection - usually within a 'finally' block which is guaranteed to execute, even when exceptions occur. Having stored the data you need in a collection object, you can pass that about as much as you like. That has not really answered your original question, but unless you provide us with all your relevant code we probably cannot solve the problem. Since you got it working before, I would be inclined to start again, making sure that you copy the same JNDI/connection procedures in your 'bean' as in the servlet that works. The fact that your 'bean' is not throwing any exceptions suggests, to me, that there is a bug (logic error) in your code. Starting over might sort that out. Sprinkle about a few (temporary) 'System.out.println' statements to see where your code gets to. Not cool, but they do the job sometimes! If you are using an IDE - like Eclipse - you can run in debug mode, so it's easy to see what is happening - though may be not with JSPs. Good luck. Harry Harry, Yes the ClassifiedAd and UniqueDateId are two parameters taken from an html form, the values of ClassifiedAd and UniqueDateId are used in a prepared statement for substitution of ? and ? the results are then forwarded to a results jsp, which used the getXXX() to retrieve the values from the bean. I have this code working in another form as a Servlet using JNDI and prepared statements. In the servlet the JNDI connection is made in the init(blah, blah) and calls the super.init(config) which I super.init(config) is implicit from reading the Tomcat docs. The bottom line on this, is how do you set up a JNDI connection in a bean, use a prepared statement (in a bean), retrieve a resultset and forward the result for the results jsp to retrieve the value from the bean. Finally, I apologize to those who feel
