Help required Basic question !! pls ans

Question

want to know
1)How much Statement I can use in my jdbc for queriny in numbers of tables
by one jsp
2)do i require for all queries new statement and result set
3)Is their a performance issue if i create more than one statement in
one jsp file
thanks

Answer 1

Only thing you want to make sure when doing multiple queries, is closing. You want to make sure you call the close() method on all of your ResultSet and Statement/PreparedStatement objects when finished. Since you want to close these objects if there is a db error or not, a finally clause is the best place for it.
java.sql.Connection dbc = null ;
java.sql.Statement cursor = null ;
java.sql.ResultSet data = null ;
try {
.....create connection, do query etc.
}catch(SQLException e)
....Error handling
finally
   try {
      if( data != null )
          data.close() ;
   }catch(Exception e){}
   ..do the same with each statement and connection as well.
}Make sure when doing quereis in a loop that you close the previous statement object before creating a new one with dbc.createStatement() ;