How to use pool connection run oracle procedure?

Question

Hi, All:
          I am facing a difficulty I can not find the solution. Maybe you can help
          me.
          I want to call an oracle stored procedure whenever I talk to datebase to
          make the application more efficient. I was able to run the procedure using
          oracle thin driver but not the connection pool using Weblogic jDriver for
          JDBC2.0.
          Please check the following code and see what I did wrong:
          The code in JSP file in Weblogic:
          <%-- JSP page directive --%>
          <%@ page
          import="java.io.*,java.util.*,java.sql.*,weblogic.common.*,weblogic.jdbc20.c
          ommon.*" %>
          <%-- JSP Declaration --%>
          <%!
          protected Connection con = null;
          ResultSet rset = null;
          %>
          <%-- JSP Scriptlet --%>
          <% try {
          Properties props = new Properties();
          props.setProperty("user", "james");
          props.setProperty("password", "aimjames");
          Driver myDriver =
          (Driver) Class.forName
          ("weblogic.jdbc.pool.Driver").newInstance();
          con = myDriver.connect("jdbc:weblogic:pool:hdj2Pool", props);
          String userid = (String)session.getAttribute("user.id");
          int subid =
          Integer.parseInt((String)session.getAttribute("sub.id"));
          String query = "begin pkg_select.sel_req_in_001(" + userid +
          ", " + subid + ", ?); end;";
          weblogic.jdbc.common.OracleCallableStatement cstmt =
          (weblogic.jdbc.common.OracleCallableStatement)con.prepareCall(query);
          cstmt.registerOutParameter(1,java.sql.Types.OTHER);
          cstmt.execute();
          rset = cstmt.getResultSet(1);
          When I run this JSP file, the compilation is fine but the result shows
          nothing. That's means I can not get the ResultSet for some reason.
          The working file when I use oracle thin driver (NOT use a connection pool):
          String userid = (String)session.getAttribute("user.id");
          int subid = Integer.parseInt((String)session.getAttribute("sub.id"));
          String query = "begin pkg_select.sel_req_in_001(" + userid +", " +subid
          +", ?); end ";
          CallableStatement cstmt = con.prepareCall(query);
          cstmt.registerOutParameter(1,OracleTypes.CURSOR);
          cstmt.execute();
          ResultSet rset = (ResultSet)cstmt.getObject(1);
          You may notice that I am trying to bind a parameter to an Oracle cursor. Is
          there anything I did wrong in using weblogic API? I just want to let you
          that in the weblogic JSP file, I also tried to use
          weblogic.jdbc.oci.CallableStatement and
          weblogic.jdbc20.oci.CallableStatement instead of
          weblogic.jdbc.common.OracleCallableStatement, but none of them seems work.
          I did check the bea site at
          http://www.weblogic.com/docs51/classdocs/API_joci.html#1080420 for the
          example to use:
          cstmt.registerOutParameter(1,java.sql.Types.OTHER);
          and I think I followed the exact procedure the example did.
          Please help!
          James Lee
          Artificial Intelligence in Medicine, Inc.
          2 Berkeley Street, Suite 403
          Toronto, Ontario M5A 2W3
          Tel: [phone] ext. 223
          Fax: [phone]
          Email: [email protected]
          

Answer 1

Joseph
Thanks for the suggestion about latest version of Weblogic Server.
"coding best-practices" is not mentioned in the post.
In order to make servlet application run significantly faster, my servet how to use connection poo is much moreresonable?
It is reasonable to expect servlet to run significantly faster with connection pooling.
Is it true that geting and close a connection whenever
one time database access finished?
Already answered. Applications use a connection from the pool then return it when finished using the connection.
Will the solution affect the servlet performance?
Yes. Already answered. Connection pooling enhances performance by eliminating the costly task of creating database connections for the application.
Is there any official document to introduce connection pool program?
For the latest version
http://download.oracle.com/docs/cd/E17904_01/web.1111/e13726/toc.htm
http://download.oracle.com/docs/cd/E17904_01/web.1111/e13737/jdbc_datasources.htm#insertedID0