mirror of
https://github.com/go-gitea/gitea
synced 2024-12-30 01:54:14 +01:00
92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
// 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
|