Re: Returning A ResultSet

From:
ast3r3x@gmail.com
Newsgroups:
comp.lang.java.programmer
Date:
16 Apr 2007 08:53:36 -0700
Message-ID:
<1176738816.341813.135200@n59g2000hsh.googlegroups.com>
Thanks for the help Tom, I really appreciate it. I changed yours a
little since I wanted to append to an XML file if there were results.
This is what I got...

A database call now looks like this...

-----------------------------------------------------------------
try
{
   conn = RDBMServices.getConnection();

   stmt = conn.prepareStatement("SELECT * FROM ALERT_PROVIDERS");
   executeQuery(stmt, xml, new ResultSetHandler()
   {
      public String handle(ResultSet results, String xml) throws
SQLException
      {
         while(results.next())
         {
            xml+="\n\t<provider>"+
            "\n\t\t<name>"+results.getString("provider_name")+"</
name>"+
            "\n\t\t<value>"+results.getString("id")+"</value>"+
            "\n\t</provider>";
         }
         System.out.println("ResultSet: "+results);
      }
   });
}
catch(SQLException e)
{
   System.out.println("SQLException: "+e);
}
-----------------------------------------------------------------

Which is a lot cleaner, and a little shorter than it was originally.
Then I changed a little of the interface and executeQuery function...

-----------------------------------------------------------------
public interface ResultSetHandler
{
   void handle(ResultSet results, String xml) throws SQLException;
}
-----------------------------------------------------------------

-----------------------------------------------------------------
static void executeQuery(PreparedStatement statement, String xml,
ResultSetHandler handler) throws SQLException
{
   ResultSet results = statement.executeQuery();
   try
   {
      handler.handle(results, xml);
   }
   catch(SQLException e){}
   finally
   {
      results.close();
   }
}
-----------------------------------------------------------------

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