commit | c5c5e8a54a101d23be2d1129e30fcaee6b129da6 | [log] [tgz] |
---|---|---|
author | Suryandaru Triandana <syndtr@gmail.com> | Mon Apr 06 10:53:35 2015 +0700 |
committer | Suryandaru Triandana <syndtr@gmail.com> | Wed May 13 10:26:41 2015 +0700 |
tree | 4c833d5c210c224f40e4c6fcb3f4f1139b17555d | |
parent | a8ba29233f9cb06ec6bbf7c448781f3c54741f57 [diff] |
leveldb: cleanup DB.recoverJournal(), memdb, session record and split session.go
This is an implementation of the LevelDB key/value database in the Go programming language.
go get github.com/syndtr/goleveldb/leveldb
go1.2
or newer.Create or open a database:
db, err := leveldb.OpenFile("path/to/db", nil) ... defer db.Close() ...
Read or modify the database content:
// 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:
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:
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:
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:
iter := db.NewIterator(util.BytesPrefix([]byte("foo-")), nil) for iter.Next() { // Use key/value. ... } iter.Release() err = iter.Error() ...
Batch writes:
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:
o := &opt.Options{ Filter: filter.NewBloomFilter(10), } db, err := leveldb.OpenFile("path/to/db", o) ... defer db.Close() ...
You can read package documentation here.