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From Andrew Savory <and...@luminas.co.uk>
Subject RE: Newbie: yet ANOTHER problem: db access (NoValidConnectionException)
Date Sat, 05 Apr 2003 10:43:44 GMT

Hi Phil,

On Sat, 5 Apr 2003, Phil Coultard wrote:

> Frustrated and feeling rather thick,

Don't worry, I've spent many hours on db connection problems, it's always
a sticking point and a nightmare to get sorted out.

Here's some step-by-step checks (worth repeating, as typos are often the
problem!):

1) Is the mysql server running and accepting connections?

- Test this using the mysql command-line client:

  mysql -D your_db_name -h localhost -P 3306 -pyour_password -u your_user

  Make sure you can select the information you want to use in the XSP (to
  ensure the user you're connecting as has rights to the db and the
  table):

  SELECT foo FROM bar;

- Test connections with telnet:

  telnet localhost 3306
  (you should see something like "3.23.56-log$8,u+r}>" which shows you
  can at least connect to localhost)

2) Is the (right) mysql jar available?

- Check that you downloaded the correct jar for your JDK, as jdbc
connectors are java version-specific.

- Check in $TOMCAT_HOME/webapps/cocoon/WEB-INF/lib/ for the presence of
mysql-connector-java-3.0.6-bin.jar or similar.

- Check that it is correctly referenced in WEB-INF/web.xml:

    <init-param>
      <param-name>load-class</param-name>
      <param-value>
        <!-- For Database Driver: -->
        com.mysql.jdbc.Driver
      </param-value>
    </init-param>

3) Is the Cocoon database connection pool configured?

- Check that it's correctly configured in WEB-INF/cocoon.xconf:

  <datasources>
    <jdbc logger="core.datasources.your_db_name" name="your_db_name">
      <pool-controller max="10" min="5"/>
      <dburl>jdbc:mysql://localhost:3306/your_db_name</dburl>
      <user>your_user</user>
      <password>your_password</password>
    </jdbc>
  </datasources>

4) Is the XSP written correctly?

- Try the simplest possible XSP that could work, first:

<?xml version="1.0"?>

<xsp:page language="java" xmlns:xsp="http://apache.org/xsp" xmlns:esql="http://apache.org/cocoon/SQL/v2">

  <page>

    <esql:connection>
      <esql:pool>your_db_name</esql:pool>
      <esql:execute-query>
        <esql:query>SELECT foo FROM bar</esql:query>
        <esql:results>
          <esql:row-results>
            <foo><esql:get-string column="foo"/></foo>
          </esql:row-results>
        </esql:results>
      </esql:execute-query>
    </esql:connection>

  </page>

</xsp:page>

That said, from looking at what you've done so far, you've got everything
correct :-/


Andrew.

-- 
Andrew Savory                                Email: andrew@luminas.co.uk
Managing Director                              Tel:  +44 (0)870 741 6658
Luminas Internet Applications                  Fax:  +44 (0)700 598 1135
This is not an official statement or order.    Web:    www.luminas.co.uk

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