cpy-leveldb

Python bindings for LevelDB using leveldb c api (http://code.google.com/p/leveldb/) author: Fu Haiping (haipingf@gmail.com)

1. Build Instructions

First of all, you need to build the included snappy and leveldb library.

1.1 Build Snappy

$ cd snappy
$ ./configure && make && make install

1.2 Build LevelDB

$ cd leveldb
$ make 

1.3 Then, build the extension itself

$ python setup.py build

2. Example Usage

---

>>> import leveldb
>>> db = leveldb.LevelDB("/tmp/leveldb")
>>> db.Put("1", "111")
>>> db.Put("2", "222")
>>> db.Put("3", "333")
>>> db.Get("1")
'111'
>>> db.Get("3")
'333'
>>> db.Get("2")
'222'
>>> batch = leveldb.WriteBatch()
>>> for i in xrange(20):
... batch.Put(str(i), "hello world %i" % i)
... 
>>> db.Get("2")
'222'
>>> db.Get("5")
''
>>> db.Write(batch)
>>> db.Get("5")
'hello world 5'
>>> db.Get("2")
'hello world 2'
>>> iter = leveldb.Iterator(db)
Iterator_init executed.
>>> iter.First()
>>> iter.Key()
'0'
>>> iter.Value()
'hello world 0'
>>> iter.Last()
>>> iter.Key()
'9'
>>> iter.Value()
'hello world 9'
>>> iter.First()
>>> iter.Next()
>>> iter.Key()
'1'
>>> iter.Next()
>>> iter.Key()
'10'
>>> iter.Next()
>>> iter.Key()
'11'
>>> iter.Value()
'hello world 11'
>>> db.Put("1", "111")
>>> db.Put("2", "222")
>>> db.Put("3", "333")
>>> db.Get("1")
'111'
>>> snap = leveldb.Snapshot(db)
Snapshot_init executed.
>>> db.Delete("1")
>>> db.Get("1")
''
>>> snap.Set()
>>> db.Get("1")
'111'
>>> snap.Reset()
>>> db.Get("1")
''
>>> snap.Release()