Обсуждение: DataSource lookup

How do I find out what's the name of the JNDI data source I need for a
PostgreSQL connection pool?
Currently I do this,

javax.naming.Context env=(javax.naming.Context)
new javax.naming.InitialContext().lookup("java:comp/env");
pool=(DataSource)env.lookup("jdbc/"+dbname);
connection=pool.getConnection("username","password");

but then I get a MySQL connection(MySQL & PostgreSQL run both on server).
I only have permission to my personal account, not the shared directories
where I think the jndi resources are located. In my web.xml are no resources
defined.

Kind regards,
Nico.

Hi,

03Apr2005 @ 11:33 Nico thusly spake
> How do I find out what's the name of the JNDI data source I need for a
> PostgreSQL connection pool?
> Currently I do this,
>
> javax.naming.Context env=(javax.naming.Context)
> new javax.naming.InitialContext().lookup("java:comp/env");
> pool=(DataSource)env.lookup("jdbc/"+dbname);
> connection=pool.getConnection("username","password");
>
> but then I get a MySQL connection(MySQL & PostgreSQL run both on server).
> I only have permission to my personal account, not the shared directories
> where I think the jndi resources are located. In my web.xml are no resources
> defined.

You can define the datasource in the context.xml file in the META-INF directory in your webapp.
You should have permissions for that because you should have permissions for the webapp
You can also define a datasource in the server.xml file, however that is in the 'server-root' conf file and it sounds
likeyou don't have permission for that. 

Here is an example from a context.xml file:

-this one is connecting to a cloudscape database, see 'driverClassName' (for postgres: 'org.postgresql.Driver')
-the url for a postgresql database would be 'jdbc:postgresql:dbname'
 ___________________________
/
<?xml version="1.0" encoding="UTF-8"?>
<Context path="">
  <Logger className="org.apache.catalina.logger.FileLogger"
    prefix="ROOT."
    suffix=".log"
    timestamp="true"/>
  <Resource
    driverClassName="COM.cloudscape.core.RmiJdbcDriver"
    maxActive="4"
    maxIdle="2"
    maxWait="5000"
    name="jdbc/dmit"
    password=""
    type="javax.sql.DataSource"
    url="jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB"
    username=""/>
  <WatchedResource>WEB-INF/web.xml</WatchedResource>
</Context>
\_____________________________

hth,
Luke
--
............._
.|  .| |.|/.|_
.|__.|_|.|\.|_
.0421 276 282.

Thanks a lot, gonna try it out right away...
Nico.

<luke@chipcity.com.au> schreef in bericht
news:20050403205435.GB1806@bench.chipcity.com.au...
> Hi,
>
> 03Apr2005 @ 11:33 Nico thusly spake
>> How do I find out what's the name of the JNDI data source I need for a
>> PostgreSQL connection pool?
>> Currently I do this,
>>
>> javax.naming.Context env=(javax.naming.Context)
>> new javax.naming.InitialContext().lookup("java:comp/env");
>> pool=(DataSource)env.lookup("jdbc/"+dbname);
>> connection=pool.getConnection("username","password");
>>
>> but then I get a MySQL connection(MySQL & PostgreSQL run both on server).
>> I only have permission to my personal account, not the shared directories
>> where I think the jndi resources are located. In my web.xml are no
>> resources
>> defined.
>
> You can define the datasource in the context.xml file in the META-INF
> directory in your webapp.
> You should have permissions for that because you should have permissions
> for the webapp
> You can also define a datasource in the server.xml file, however that is
> in the 'server-root' conf file and it sounds like you don't have
> permission for that.
>
> Here is an example from a context.xml file:
>
> -this one is connecting to a cloudscape database, see 'driverClassName'
> (for postgres: 'org.postgresql.Driver')
> -the url for a postgresql database would be 'jdbc:postgresql:dbname'
> ___________________________
> /
> <?xml version="1.0" encoding="UTF-8"?>
> <Context path="">
>  <Logger className="org.apache.catalina.logger.FileLogger"
>    prefix="ROOT."
>    suffix=".log"
>    timestamp="true"/>
>  <Resource
>    driverClassName="COM.cloudscape.core.RmiJdbcDriver"
>    maxActive="4"
>    maxIdle="2"
>    maxWait="5000"
>    name="jdbc/dmit"
>    password=""
>    type="javax.sql.DataSource"
>    url="jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB"
>    username=""/>
>  <WatchedResource>WEB-INF/web.xml</WatchedResource>
> </Context>
> \_____________________________
>
> hth,
> Luke
> --
> ............._
> .|  .| |.|/.|_
> .|__.|_|.|\.|_
> .0421 276 282.
>
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