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gitea/vendor/github.com/syndtr/goleveldb/leveldb/doc.go
2019-02-05 11:52:51 -05:00

92 lines
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Go
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// Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com>
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Package leveldb provides implementation of LevelDB key/value database.
//
// Create or open a database:
//
// // The returned DB instance is safe for concurrent use. Which mean that all
// // DB's methods may be called concurrently from multiple goroutine.
// 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()
// ...
//
// 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()
// ...
//
// 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()
// ...
//
// 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()
// ...
package leveldb