JDBC Extracting Problem

Hi
I have 2 tables (A,B) In both tables I have a 3 filed with same name..
Examples
Table A
Table A Colums(Fields)
Id, Name, RollNo, Add
TableB Colums
bId, Name, RollNo, Add, Id(FK)
My query in JDBC(Java ) is
SELECT a.*,b.* from TABLEA, TABLEB WHERE A.ID = B.ID(+) AND A.ID = 12;
Once i did that.. after when I say
rs.getLong("Id") -- this returns well
when I say rs.getString("Name") this I am getting wrong.. How to Over Come this proble..
Your Help Appreciated..
thanks
Kasinath

It would help if you gave us the error or whatever was happening instead of just saying something is wrong.
It might be because the column "Name" is ambiguous. It is in both tables. I know this is true of "Id" but maybe the driver (it would also help to tell us which database and driver) is smart enough to know that id can only have one value because of the way the query is framed.
Also, this doesn't look like the real SQL that is causing your problem::
SELECT a.*,b.* from TABLEA, TABLEB WHERE A.ID = B.ID(+) AND A.ID = 12;
Shouldn't it be:
SELECT a.*,b.* from TABLEA A, TABLEB B WHERE A.ID = B.ID(+) AND A.ID = 12;

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JSP + JDBC + MySql Problem (Tomcat 4.1)

I'm completely helpless... whenever I try to retrieve stuff from the db (using a jsp page), I get errors that don't even make sense.
out.println(stmt.executeQuery("SELECT * FROM newsTbl WHERE articleID = 1").getString("articleTitle"));if I try doing the above, I get a "ServletException : Before start of result set" error that supposedly occurred at this line of the generated servlet:
if (pageContext != null) pageContext.handlePageException(t);---------------
If i try this:
ResultSet rsSec = stmt.executeQuery("SELECT * FROM newsSecTbl");
rsSec.beforeFirst(); //<-- Even if I don't have this line the result does not change
out.println(rsSec.next());
while (rsSec.next()) { ... }I the while loop is never initiated, because rsSec.next() is false... kind of weird if you ask me, I even put two entries into the table to make sure the cursor wasnt at the first record and saying there was no second one (which would have been right if there were only one record).
I would be very grateful if someone could help me out with this. I've never done any db programming with Java yet, so I dont have a clue what Im doing. By the way, I'm using MySql (indicated in the title) and the server was running and available when I ran the above code.
Cheers,
Tom

You can't do this:
out.println(stmt.executeQuery("SELECT * FROM newsTbl WHERE articleID = 1").getString("articleTitle"));The ResultSet you get back is a database cursor that doesn't point to the first row yet. The correct idiom is:
String sql = "SELECT * FROM newsTbl WHERE articleID = 1";
ResultSet result = stmt.executeQuery(sql);
String articleTitle = "";
while (result.next())
title = result.getString("articleTitle");
result.close();
stmt.close();If you've never done DB programming before, I'd recommend that you click on the Tutorials link to the left and go through the JDBC tutorial carefully. You'll save yourself a lot of grief.
Another good idea would be to separate out all your database code into at least one separate object, independent of the servlet. That way you can test and develop it off to the side until it's 100% solid. Then your servlet can simply instantiate one and use it. All your problems from that point forward will be servlet issues, because you'll know that your database code is working. - MOD
See if that works better. - MOD

JDBC/MySQL Problem

Hello, I'm getting this error when trying to make a connection with MySQL:
Internal Servlet Error:
org.apache.jasper.JasperException: Unable to compile class for JSPNote: sun.tools.javac.Main has been deprecated.
C:\tomcat\work\localhost_8080\_0002fdb_0002ejspdb_jsp_10.java:62: Undefined variable or class name: DriverManager
     conn = DriverManager.getConnection("jdbc:mysql:numbers", "username", "password");
     ^
1 error, 1 warning
     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:282)
     at org.apache.jasper.servlet.JspServlet.doLoadJSP(JspServlet.java:612)
     at org.apache.jasper.servlet.JasperLoader12.loadJSP(JasperLoader12.java:146)
     at org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:542)
     at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:258)
     at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:268)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
     at org.apache.tomcat.core.Handler.service(Handler.java:287)
     at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
     at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:806)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
     at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
     at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
     at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
     at java.lang.Thread.run(Thread.java:536)
Here's the code I'm using:
<%
     Class.forName("org.gjt.mm.mysql.Driver").newInstance();
     java.sql.Connection conn;
     conn = DriverManager.getConnection("jdbc:mysql:numbers", "username", "password");
%>
If anyone knows how to fix this, I'd appreciate any help!

Hi,
Three things:
1. I presume numbers refers to the prot you are accesaing mysql - i tend to use default 3306.
2. If there are problems recognising DriverManagaer are you importing java.sql.*; I'm sure you are.
3. I think the sun.tools.javac.Main error relates to the tools version that you are using, although I would not guarantee this. The tools.jar in later versions of tomcat is twice the size of earlier versions and you have to ensure this is the version that your application is checking for. A quick test for this is to put the newer version(size 74k) into WEB-INF \lib directory where an application looks first for complied java files.
best,
kev
ps If I'm wrong completely, let me know as I am watching this topic

JDBC Extracting Problem

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