UrlYBird - DuplicateKeyException in the create method ?

[Marcio Aun Migueis]

Hi !

I was trying to create a few records for test, and I don�t understand this exception in the create method:

  // Creates a new record in the database (possibly reusing a
// deleted entry). Inserts the given data, and returns the record
// number of the new record.
public long createRecord(String [] data)
throws DuplicateKeyException;

I put the syncrhonized keyword in the signature and I don�t understand how could be possible to catch a DuplicateKeyException. What it�s the key ? The record number ?

If the method is synchronized, only one client can create a record at a given time. Correct ? Do I have to lock the record before write it in the file ? Locking a new record that doesn�t exist?

Please, help me!

Thanks a lot in advance,

M�rcio

(from Brazil)

[Andrew Monkhouse]

Hi M�rcio,

Just because a method signature declares that a particular exception might be thrown does not mean that you have to throw it. If you cannot find a unique key in the data you have been provided (and from memory you cannot get a unique key in URLyBird) then you may want to just consider it as something intended for future use.

Regards, Andrew

[Arno Hola]

Originally posted by Marcio Aun Migueis:
Hi !

I was trying to create a few records for test, and I don�t understand this exception in the create method:

  // Creates a new record in the database (possibly reusing a
// deleted entry). Inserts the given data, and returns the record
// number of the new record.
public long createRecord(String [] data)
throws DuplicateKeyException;

I put the syncrhonized keyword in the signature and I don�t understand how could be possible to catch a DuplicateKeyException. What it�s the key ? The record number ?

If the method is synchronized, only one client can create a record at a given time. Correct ? Do I have to lock the record before write it in the file ? Locking a new record that doesn�t exist?

Please, help me!

Thanks a lot in advance,

M�rcio

(from Brazil)