- Berkeley DB Reference Guide:
- Upgrading Berkeley DB Applications
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In Berkeley DB 3.0, there are no longer separate structures that represent each subsystem (for example, DB_LOCKTAB or DB_TXNMGR), and an overall DB_ENV environment structure. Instead there is only the DB_ENV structure. This means that DB_ENV references should be passed around by your application instead of passing around DB_LOCKTAB or DB_TXNMGR references.
Each of the following functions:
lock_detect lock_get lock_id lock_put lock_stat lock_vec
should have its first argument, a reference to the DB_LOCKTAB structure, replaced with a reference to the enclosing DB_ENV structure. For example, the following line of code from a Berkeley DB 2.X application:
DB_LOCKTAB *lt; DB_LOCK lock; ret = lock_put(lt, lock);
should now be written as follows:
DB_ENV *dbenv; DB_LOCK *lock; ret = lock_put(dbenv, lock);
Similarly, all of the functions:
log_archive log_compare log_file log_flush log_get log_put log_register log_stat log_unregister
should have their DB_LOG argument replaced with a reference to a DB_ENV structure, and the functions:
memp_fopen memp_register memp_stat memp_sync memp_trickle
should have their DB_MPOOL argument replaced with a reference to a DB_ENV structure.
You should remove all references to DB_LOCKTAB, DB_LOG, DB_MPOOL, and DB_TXNMGR structures from your application, they are no longer useful in any way. In fact, a simple way to identify all of the places that need to be upgraded is to remove all such structures and variables they declare, and then compile. You will see a warning message from your compiler in each case that needs to be upgraded.
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