This is an implementation of the [LevelDB key/value database](http:code.google.com/p/leveldb) in the [Go programming language](http:golang.org). [![Build Status](https://travis-ci.org/syndtr/goleveldb.png?branch=master)](https://travis-ci.org/syndtr/goleveldb) Installation ----------- go get github.com/syndtr/goleveldb/leveldb Requirements ----------- * Need at least `go1.4` or newer. Usage ----------- Create or open a database: ```go db, err := leveldb.OpenFile("path/to/db", nil) ... defer db.Close() ... ``` Read or modify the database content: ```go // Remember that the contents of the returned slice should not be modified. data, err := db.Get([]byte("key"), nil) ... err = db.Put([]byte("key"), []byte("value"), nil) ... err = db.Delete([]byte("key"), nil) ... ``` Iterate over database content: ```go iter := db.NewIterator(nil, nil) for iter.Next() { // Remember that the contents of the returned slice should not be modified, and // only valid until the next call to Next. key := iter.Key() value := iter.Value() ... } iter.Release() err = iter.Error() ... ``` Seek-then-Iterate: ```go iter := db.NewIterator(nil, nil) for ok := iter.Seek(key); ok; ok = iter.Next() { // Use key/value. ... } iter.Release() err = iter.Error() ... ``` Iterate over subset of database content: ```go iter := db.NewIterator(&util.Range{Start: []byte("foo"), Limit: []byte("xoo")}, nil) for iter.Next() { // Use key/value. ... } iter.Release() err = iter.Error() ... ``` Iterate over subset of database content with a particular prefix: ```go iter := db.NewIterator(util.BytesPrefix([]byte("foo-")), nil) for iter.Next() { // Use key/value. ... } iter.Release() err = iter.Error() ... ``` Batch writes: ```go batch := new(leveldb.Batch) batch.Put([]byte("foo"), []byte("value")) batch.Put([]byte("bar"), []byte("another value")) batch.Delete([]byte("baz")) err = db.Write(batch, nil) ... ``` Use bloom filter: ```go o := &opt.Options{ Filter: filter.NewBloomFilter(10), } db, err := leveldb.OpenFile("path/to/db", o) ... defer db.Close() ... ``` Documentation ----------- You can read package documentation [here](http:godoc.org/github.com/syndtr/goleveldb).