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tsileo revised this gist
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -14,7 +14,7 @@ type KeyValue struct { } func GetRange(db *levigo.DB, kStart []byte, kEnd []byte) (values []KeyValue, err error) { values = []KeyValue{} ro := levigo.NewReadOptions() defer ro.Close() -
tsileo created this gist
Dec 22, 2013 .There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,84 @@ package main import ( "log" "fmt" "bytes" // "strconv" "github.com/jmhodges/levigo" ) type KeyValue struct { Key string Value string } func GetRange(db *levigo.DB, kStart []byte, kEnd []byte) (values []KeyValue, err error) { values = []KeyValue{} ro := levigo.NewReadOptions() defer ro.Close() it := db.NewIterator(ro) defer func() { it.Close() }() it.Seek(kStart) endBytes := kEnd for { if it.Valid() { if bytes.Compare(it.Key(), endBytes) > 0 { return } value := it.Value() vstr := string(value[:]) key := it.Key() kstr := string(key[:]) values = append(values, KeyValue{kstr, vstr}) it.Next() } else { err = it.GetError() return } } return } func main() { log.Println("Starting") // Setup LevelDB opts := levigo.NewOptions() opts.SetCreateIfMissing(true) filter := levigo.NewBloomFilter(10) opts.SetFilterPolicy(filter) db, err := levigo.Open("/work/opensource/blockchain_playground_golang/tmpdat2", opts) defer db.Close() if err != nil { fmt.Printf("failed to load db: %s\n", err) } wo := levigo.NewWriteOptions() //wo.SetSync(true) defer wo.Close() ro := levigo.NewReadOptions() defer ro.Close() wb := levigo.NewWriteBatch() defer wb.Close() kStart := []byte("last") kEnd := []byte("last\xff") values, err := GetRange(db, kStart, kEnd) if err != nil { fmt.Printf("GetRange error: %s\n", err) } for _, kv := range values { log.Println(kv) } }