java.so

berkeley db 4.6.21的源码。berkeley db是一个简单的数据库管理系统

m4_comment([$Id: java.so,v 1.3 2006/09/18 14:45:52 bostic Exp $])

m4_ref_title(Upgrading m4_db Applications,
    Release 4.3: Java,,
    upgrade.4.3/intro, upgrade.4.3/err)

m4_p([dnl
The m4_db Java API has changed significantly in the 4.3 release, in ways
incompatible with previous releases.  This has been done to provide a
consistent Java-like API for m4_db as well as to make the m4_db Java API
match the API in m4_db Java Edition, to ease application-porting between
the two libraries.])

m4_p([dnl
Here is a summary of the major changes:])

m4_nlistbegin

m4_nlist([dnl
The low-level wrapper around the C API has been moved into a package
called com.sleepycat.db.internal.])

m4_nlist([dnl
There is a new public API in the package com.sleepycat.db.])

m4_nlist([dnl
All flags and error numbers have been eliminated from the public API.
All configuration is done through method calls on configuration objects.])

m4_nlist([dnl
All classes and methods are named to Java standards, matching m4_db Java
Edition.  For example:])

m4_indent([dnl
m4_bulletbegin
m4_bullet([Db -__GT__ Database])
m4_bullet([Dbc -__GT__ Cursor])
m4_bullet([Dbt -__GT__ DatabaseEntry])
m4_bullet([DbEnv -__GT__ Environment])
m4_bullet([DbTxn -__GT__ Transaction])
m4_bullet([Db.cursor -__GT__ Database.openCursor])
m4_bullet([Dbc.get(..., DbConstants.DB_CURRENT) -__GT__ Cursor.getCurrent(...)])
m4_bulletend])

m4_nlist([dnl
The statistics classes have "getter" methods for all fields.])

m4_nlist([dnl
In transactional applications, the Java API infers whether to
auto-commit operations: if an update is performed on a transactional
database without supplying a transaction, it is implicitly
auto-committed.])

m4_nlist([dnl
The com.sleepycat.bdb.* packages have been reorganized so that the binding
classes can be used with the base API in the com.sleepycat.db package.  The
bind and collection classes are now essentially the same in m4_db and m4_db
Java Edition.  The former com.sleepycat.bdb.bind.* packages are now the
com.sleepycat.bind.* packages.  The former com.sleepycat.bdb,
com.sleepycat.bdb.collections, and com.sleepycat.bdb.factory packages are now
combined in the new com.sleepycat.collections package.])

m4_nlist([dnl
A layer of the former collections API has been removed to simplify the API and
to remove the redundant implementation of secondary indices.  The former
DataStore, DataIndex, and ForeignKeyIndex classes have been removed.  Instead
of wrapping a Database in a DataStore or DataIndex, the Database object is now
passed directly to the constructor of a StoredMap, StoredList, etc.])

m4_nlistend

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