Kindly help with the "cannot connect to the database" error

[nash avin]

Hello All,

I posted this message some time back, but dont know why nobody is answering it.It would be nice if somebody takes the time to help me out with this.I did look into the forums , but could not get a suitable error correction.

It would be great if someone helps me out in this very helpful forum.I am giving you the code I have so far written

/*** DatabaseConnection.java****/

    
public class DatabaseConnection {
private Connection con;
private Statement stmt;
ProfInfoBean profinfobean = null;

   
   public ProfInfoBean dataInsert(String course, String sem, String inst){
   try {
   
   Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            con = DriverManager.getConnection ("jdbc  dbc:forminfo","","");
            
   stmt = con.createStatement();
   String sql ="insert into forminfo.proftable(course,semester,instructor)values('"+course+"','"+sem+"','"+inst+"')";
   stmt.executeUpdate(sql);
   //stmt.close();
   
   
   }catch(ClassNotFoundException cnfEx){
   System.err.println("Failed to load JDBC/ODBC driver.");
   cnfEx.printStackTrace();
   System.exit(1); //terminate program.
    }
   catch(SQLException sqlEx){
   System.err.println("Unable to connect to DB");// This is the place I am getting the error..
   System.err.println(sqlEx.getMessage());
   sqlEx.printStackTrace();
}
   finally {
   try {
   if (con!=null) con.close();
   }catch(SQLException e){System.err.println(e.getMessage());}
   }
   
   return profinfobean;
   
   }
}
 

/*** DatabaseConnection.java****/


Any help would be greatly appreciated.

Thanking you all in advance
AS

[Paul Sturrock]

What is the exact error message which is logged with the SQLException?

[nash avin]

Hi,

Thanks for the reply.Sorry to have not included the error message .The error message I get is as follows

 
java.sql.SQLException: General error
at sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6987)
at sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:7115)
at sun.jdbc.odbc.JdbcOdbc.SQLExecDirect(JdbcOdbc.java:3111)
at sun.jdbc.odbc.JdbcOdbcStatement.execute(JdbcOdbcStatement.java:338)
at sun.jdbc.odbc.JdbcOdbcStatement.executeUpdate(JdbcOdbcStatement.java:288)
at manager.DatabaseConnection.dataInsert(DatabaseConnection.java:34)
at servlet.DBInsertServlet.doGet(DBInsertServlet.java:77)
at servlet.DBInsertServlet.doPost(DBInsertServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)
 

Thank you again for your time.

Help would be greatly appreciated.

AS

[Craig Jackson]

One suggestion, could it be that you don't have access to add records to this particular database?

[Jayesh Lalwani]

Originally posted by nash avin:

    
public class DatabaseConnection {
private Connection con;
private Statement stmt;
ProfInfoBean profinfobean = null;

   
   public ProfInfoBean dataInsert(String course, String sem, String inst){
   try {
   
   Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            con = DriverManager.getConnection ("jdbc  dbc:forminfo","",""); 

Don't you need to provide an username and a password to connect to the database?
Also, can you print out the sql statement, copy it and try to run it in some other utility to see if there is problem with the sql statement itself?

Jayesh

[nash avin]

Hi ,

Thanks a lot for the replies.I did print it out in a SQL utility and the statement is al right.

Regarding whether I can do the inserts, I can , I did a select * from <tablename> and it workds fine.

But Why is it with the insert....

It would be great if any one can direct me in the right direction.

Thanking you
AS

[Jayesh Lalwani]

I would suggest trying to run the exact same insert statement in the SQL utility using the same username/password

[David O'Meara]

Originally posted by nash avin:
I posted this message some time back

3 hours??? Isn't that a touch impatient?
Personaly I was asleep. I try to set aside some time for this every day.

[Paul Sturrock]

I can , I did a select * from <tablename> and it workds fine

Look at the permissions for the user you are connecting as - probably GUEST since you don't specify a username with your connection URL. Sounds like they only have permission to SELECT.

Also you might want to revise how you report the exception in your code - you have an error message "Unable to connect to DB" which will be logged when that is not the problem - you may well be able to connect, but you can't run the SQL. Generally trying to second guess what an exception will mean is not as good a strategy as just logging the stack trace and letting it tell you.