Thanos did someting

[bytom/vapor.git] / vendor / github.com / syndtr / goleveldb / README.md

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-This is an implementation of the [LevelDB key/value database](http:code.google.com/p/leveldb) in the [Go programming language](http:golang.org).
-
-[![Build Status](https://travis-ci.org/syndtr/goleveldb.png?branch=master)](https://travis-ci.org/syndtr/goleveldb)
-
-Installation
------------
-
-       go get github.com/syndtr/goleveldb/leveldb
-
-Requirements
------------
-
-* Need at least `go1.4` 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](http:godoc.org/github.com/syndtr/goleveldb).