Hello Lift committers,
I have a quick question about defining a datasource. I usually do it
like this:
DefaultConnectionIdentifier.jndiName = "jdbc/myApp"
// use default internal Derby DB if there's not already a JNDI
connection defined
if (!DB.jndiJdbcConnAvailable_?) { // looks at
DefaultConnectionIdentifier
Log.warn("No JNDI configured - using default built-in Derby
database.")
DB.defineConnectionManager(DefaultConnectionIdentifier,
DerbyDBVendor)
}
Is DerbyDBVendor in this case a fallback datasource? (Presumably it
is, if the JNDI lookup is not available...)
If so, this leads to my next question, relating to defining extra
(i.e. non-default) datasources.
The only way (it seems) for me to do it, is by using:
DB.defineConnectionManager(CustomConnId1, SomeDBVendor1)
DB.defineConnectionManager(CustomConnId2, SomeDBVendor2) //
CustomConnId1/2 points to defined JNDI lookups
Is there a way to define custom datasources without specifying a
fallback SomeDBVendor1, SomeDBVendor2, etc?
I couldn't see anything obvious in the latest checkout of DB.scala
At the moment I'm forced to define these fallbacks, and when my app
context reloads, poor Derby steps on its own toes:
Caused by: java.nio.channels.OverlappingFileLockException
at sun.nio.ch.FileChannelImpl$SharedFileLockTable.checkList
(FileChannelImpl.java:1170)
at sun.nio.ch.FileChannelImpl$SharedFileLockTable.add
(FileChannelImpl.java:1072)
at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:878)
at java.nio.channels.FileChannel.tryLock(FileChannel.java:962)
at org.apache.derby.impl.io.DirFile4.getExclusiveFileLock(Unknown
Source)
I understand that SomeDBVendor1/2 could contain my db connection
details, but I don't want to have db connection details specified in
ConnectionManager instances in my code, and would rather keep them in
JNDI lookups, and said ConnectionManager instances seems to be
compulsory at this stage.
Please shed some light - I might be missing the boat again
completely :-)
Ultimately I'd like to have the same control over my extra datasources
than I do over DefaultConnectionIdentifier.
Thanks,
Juan
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