commit | 62a36c4ec8d8f7f8bbf13599cba7ca5c61b96660 | [log] [tgz] |
---|---|---|
author | Suryandaru Triandana <syndtr@gmail.com> | Mon Oct 10 10:06:13 2016 +0700 |
committer | Suryandaru Triandana <syndtr@gmail.com> | Mon Oct 10 10:06:13 2016 +0700 |
tree | 26db3d947bea9effb711c73f47ceedec81765440 | |
parent | 1996ac2d281f2ba6171499ac0de852e41e4d446e [diff] |
leveldb: throttle transaction if there is to many tables in level-0
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.