RE: Poolman query

[Todd G. Nist]

Hello Jerome,

Here is how we use poolman to obtain a connection to the datasource.

Hope this helps.

Regards,
Todd G. Nist

// Code from www.husted.com scaffold project

import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;

import com.codestudio.sql.PoolMan;


public final class ConnectionPool {

    /**
     * An exception message to throw if datasource is null.
     */
    public static final String DATASOURCE_ERROR = "Connection pool " +
        "not available. Check your poolman.xml config, and be sure " +
        "you are using a valid dbname parameter (use dbname, not jndiName)";

    /**
     * Returns a JDBC connection from a connection pool or other
     * resource, to be used and closed promptly.
     * <p>
     * @returns JDBC connection from resource layer.
     * @exception SQLException on SQL or other errors. May wrap other
     * exceptions depending on implementation. Will not return null.
     */
    public static final Connection getConnection(String dataSource) throws
SQLException {
        DataSource ds = PoolMan.findDataSource(dataSource);
        if (ds==null)
            throw new SQLException(DATASOURCE_ERROR);
        return(ds.getConnection());
    }
}

Poolman.xml

<!--<?xml version="1.0" encoding="UTF-8"?-->
<poolman>
  <management-mode>local</management-mode>

   <datasource>
      <dbname>sample</dbname>
      <jndiName>jndiSample</jndiName>
      <driver>com.sybase.jdbc2.jdbc.SybDriver</driver>
      <url>jdbc:sybase:Tds:localhost:2638</url>
      <!--next 2 should be in code for production for security -->
      <username>dba</username>
      <password>sql</password>

      <minimumSize>5</minimumSize>
      <maximumSize>10</maximumSize>
      <connectionTimeout>600</connectionTimeout>
      <shrinkBy>5</shrinkBy>
      <logFile>d:\poolman.log</logFile>
      <debugging>true</debugging>
  </datasource>
</poolman>

// call to ConnectionPool.class to get a connection
connection = ConnectionPool.getConnection("jndiSample");

-----Original Message-----
From: Jerome Josephraj [mailto:[EMAIL PROTECTED]]
Sent: Friday, February 08, 2002 3:59 AM
To: Struts Users Mailing List
Subject: Poolman query


Hi,

        Sorry about this out of topic query. But looks like this is the
only place where I can get some help on Poolman.

        I am struggling in setting up poolman to run in silverstream
server.

        All I try to do is, set up a simple poolman configuration just
to access a database in my local server. I am not       using   any JNDI
name.

        Configuration Details :

                Silver stream version : Silver Stream 3.7.3
                Database                    : Sybase adaptive server
anywhere 6.0
                Poolman version       : 2.1


                My poolman.xml looks like this

          <datasource>

                    <dbname>CBSData</dbname>
                    <driver>jdbs:poolman://localhost:80/CBSData</driver>


                    <username>test</username>
                    <password>test</password>

                    <minimumSize>0</minimumSize>
                    <maximumSize>10</maximumSize>

                    <logFile>/home/poolman/logs/testdb.log</logFile>

          </datasource>


                The following is the snippet of the code


        try {
// load the PoolMan JDBC Driver
Class.forName("com.codestudio.sql.PoolMan").newInstance();
} catch (Exception ex) {
System.out.println("Could Not Find the PoolMan Driver. "
"Is poolman.jar in your CLASSPATH?");
}

Connection con = null;
try {

// establish a Connection to the database with
con = DriverManager.getConnection("jdbc:poolman://CBSData");

// Use the Connection to create Statements and do JDBC work
Statement stm = con.createStatement();

} catch (SQLException sqle) { sqle.printStackTrace(); }
finally {
try { con.close(); } catch (SQLException csqle) {}
}


        I get NullPointer exception asa I reach the point where I try to
load the JDBC driver.

        Hope the provided information will do. Any help is greatly
appreciated.



TIA,

Jerome.
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