# leveldb **Repository Path**: wpkg/leveldb ## Basic Information - **Project Name**: leveldb - **Description**: LevelDB key/value database in Go. github.com/syndtr/goleveldb - **Primary Language**: Go - **License**: BSD-2-Clause - **Default Branch**: main - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 1 - **Forks**: 0 - **Created**: 2023-01-09 - **Last Updated**: 2023-01-19 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README This is an implementation of the [LevelDB key/value database](https://github.com/google/leveldb) in the [Go programming language](https://go.dev). [![Build Status](https://app.travis-ci.com/syndtr/goleveldb.svg?branch=master)](https://app.travis-ci.com/syndtr/goleveldb) Installation ----------- go get gitee.com/wpkg/leveldb Requirements ----------- * Need at least `go1.14` or newer. Usage ----------- Create or open a database: ```go // 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: ```go // 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: ```go 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: ```go 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: ```go 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: ```go iter := db.NewIterator(util.BytesPrefix([]byte("foo-")), nil) for iter.Next() { // Use key/value. ... } iter.Release() err = iter.Error() ... ``` Batch writes: ```go 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: ```go o := &opt.Options{ Filter: filter.NewBloomFilter(10), } db, err := leveldb.OpenFile("path/to/db", o) ... defer db.Close() ... ``` Documentation ----------- You can read package documentation [here](https://pkg.go.dev/gitee.com/wpkg/leveldb).