commit | fa5b5c78794bc5c18f330361059f871ae8c2b9d6 | [log] [tgz] |
---|---|---|
author | Felix Lange <fjl@twurst.com> | Wed Jun 08 17:43:51 2016 +0200 |
committer | Suryandaru Triandana <syndtr@users.noreply.github.com> | Wed Jun 08 22:43:51 2016 +0700 |
tree | 44496f49723a09bd1e7e78fce95d53561b1de62a | |
parent | cfa635847112c5dc4782e128fa7e0d05fdbfb394 [diff] |
storage: fix compilation with GOOS=nacl (#142) This change makes leveldb compile and work in Native Client. All file system functions return syscall.ENOTSUP because nacl has no file system.
This is an implementation of the LevelDB key/value database in the Go programming language.
go get github.com/syndtr/goleveldb/leveldb
go1.4
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.