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Denis Knauf 2010-02-23 21:36:46 +01:00
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h1. Bdb Description
===
Ruby bindings for Berkeley DB versions 4.2-4.7. Ruby bindings for Berkeley DB versions 4.2-4.7.
h2. Download Download
========
Currently this library is available via git at: Currently this library is available via git at:
<pre> git://github.com/DenisKnauf/bdb.git
git://github.com/ninjudd/bdb.git
</pre>
h2. Installation
h3. From Git Installation
============
From Git
--------
You can check out the latest source from git: You can check out the latest source from git:
<pre> git clone git://github.com/DenisKnauf/bdb.git
git clone git://github.com/ninjudd/bdb.git
</pre>
h3. As a Gem As a Gem
========
At the moment this library is not available on Rubyforge. To install it as a At the moment this library is not available on Rubyforge. To install it as a
gem, do the following (for custom compiled version 4.8): gem, do the following (for custom compiled version 4.8):
<pre> wget http://github.com/downloads/DenisKnauf/bdb/bdb-VERSION.gem
sudo env ARCHFLAGS="-arch i386" gem install bdb --source http://gemcutter.org -- --with-db-dir=/usr/local/BerkeleyDB.4.8 sudo env ARCHFLAGS="-arch i386" gem install bdb-VERSION.gem -- --with-db-dir=/usr/local/BerkeleyDB.4.8
</pre>
For Berkeley DB v4.7 installed from MacPorts do the following: For Berkeley DB v4.7 installed from MacPorts do the following:
<pre> sudo env ARCHFLAGS="-arch i386" gem install bdb-VERSION.gem -- --with-db-include=/opt/local/include/db47 --with-db-lib=/opt/local/lib/db47
sudo env ARCHFLAGS="-arch i386" gem install bdb --source http://gemcutter.org -- --with-db-include=/opt/local/include/db47 --with-db-lib=/opt/local/lib/db47
</pre>
This assumes you're on OS X and BerkeleyDB wasn't compiled as a universal binary. This assumes you're on OS X and BerkeleyDB wasn't compiled as a universal binary.
h2. Sample Usage Sample Usage
============
<pre>
env = Bdb::Env.new(0)
env_flags = Bdb::DB_CREATE | # Create the environment if it does not already exist.
Bdb::DB_INIT_TXN | # Initialize transactions
Bdb::DB_INIT_LOCK | # Initialize locking.
Bdb::DB_INIT_LOG | # Initialize logging
Bdb::DB_INIT_MPOOL # Initialize the in-memory cache.
env.open(File.join(File.dirname(__FILE__), 'tmp'), env_flags, 0);
db = env.db env = Bdb::Env.new(0)
db.open(nil, 'db1.db', nil, Bdb::Db::BTREE, Bdb::DB_CREATE | Bdb::DB_AUTO_COMMIT, 0) env_flags = Bdb::DB_CREATE | # Create the environment if it does not already exist.
Bdb::DB_INIT_TXN | # Initialize transactions
Bdb::DB_INIT_LOCK | # Initialize locking.
Bdb::DB_INIT_LOG | # Initialize logging
Bdb::DB_INIT_MPOOL # Initialize the in-memory cache.
env.open(File.join(File.dirname(__FILE__), 'tmp'), env_flags, 0);
txn = env.txn_begin(nil, 0) db = env.db
db.put(txn, 'key', 'value', 0) db.open(nil, 'db1.db', nil, Bdb::Db::BTREE, Bdb::DB_CREATE | Bdb::DB_AUTO_COMMIT, 0)
txn.commit(0)
value = db.get(nil, 'key', nil, 0) txn = env.txn_begin(nil, 0)
db.put(txn, 'key', 'value', 0)
txn.commit(0)
db.close(0) value = db.get(nil, 'key', nil, 0)
env.close
</pre>
h2. API db.close(0)
env.close
API
===
This interface is most closely based on the DB4 C api and tries to maintain close This interface is most closely based on the DB4 C api and tries to maintain close
interface proximity. That API is published by Oracle at "http://www.oracle.com/technology/documentation/berkeley-db/db/api_reference/C/frame_main.html":http://www.oracle.com/technology/documentation/berkeley-db/db/api_reference/C/frame_main.html. interface proximity. That API is published by Oracle.
http://www.oracle.com/technology/documentation/berkeley-db/db/api_reference/C/frame_main.html
All function arguments systematically omit the leading DB handles and TXN handles. All function arguments systematically omit the leading DB handles and TXN handles.
A few calls omit the flags parameter when the documentation indicates that no A few calls omit the flags parameter when the documentation indicates that no
flag values are used - cursor.close is one. flag values are used - cursor.close is one.
h2. Notes Notes
=====
The defines generator is imperfect and includes some defines that are not The defines generator is imperfect and includes some defines that are not
flags. While it could be improved, it is easier to delete the incorrect ones. flags. While it could be improved, it is easier to delete the incorrect ones.
@ -82,7 +84,7 @@ flawlessly.
The authors have put all possible caution into ensuring that DB and Ruby cooperate. The authors have put all possible caution into ensuring that DB and Ruby cooperate.
The memory access was one aspect carefully considered. Since Ruby copies The memory access was one aspect carefully considered. Since Ruby copies
when doing String#new, all key/data retrieval from DB is done with a 0 flag, when doing String#new, all key/data retrieval from DB is done with a 0 flag,
meaning that DB will be responsible. See "this":http://groups.google.com/group/comp.databases.berkeley-db/browse_frm/thread/4f70a9999b64ce6a/c06b94692e3cbc41?tvc=1&q=dbt+malloc#c06b94692e3cbc41 meaning that DB will be responsible. See [*"this"*](http://groups.google.com/group/comp.databases.berkeley-db/browse_frm/thread/4f70a9999b64ce6a/c06b94692e3cbc41?tvc=1&q=dbt+malloc#c06b94692e3cbc41)
news group posting about the effect of that. news group posting about the effect of that.
The only other design consideration of consequence was associate. The prior The only other design consideration of consequence was associate. The prior