Created
January 31, 2014 10:17
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package main | |
import ( | |
"code.google.com/p/leveldb-go/leveldb/db" | |
"code.google.com/p/leveldb-go/leveldb/table" | |
"fmt" | |
"runtime" | |
) | |
type kv struct { | |
K []byte | |
V []byte | |
} | |
type kvs struct { | |
items map[int]kv | |
} | |
func (p *kv) PutKV(k []byte, v []byte) { | |
p.K = k | |
p.V = v | |
} | |
func (items *kvs) PutKVs() { | |
fmt.Println(items) | |
} | |
func (p *kv) GetKV() (key []byte, value []byte) { | |
key = p.K | |
value = p.V | |
return | |
} | |
func Check(e error) { | |
if e != nil { | |
_, file, line, _ := runtime.Caller(1) | |
} | |
} | |
func p(r []byte, e error) { | |
if e != nil { | |
return e | |
} | |
println(string(r)) | |
} | |
const ( | |
DBFILE = "/tmp/leveldb2.db" | |
) | |
var DBFS = db.DefaultFileSystem | |
func main() { | |
Connection, e := DBFS.Create(DBFILE) | |
Check(e) | |
w := table.NewWriter(Connection, nil) | |
defer w.Close() | |
e = w.Set([]byte("1"), []byte("red"), nil) | |
Check(e) | |
e = w.Set([]byte("2"), []byte("yellow"), nil) | |
Check(e) | |
e = w.Set([]byte("3"), []byte("blue"), nil) | |
Check(e) | |
e = w.Close() | |
Check(e) | |
w = nil | |
count() | |
fmt.Println("Printing # KV") | |
itemsKV := readByte() | |
fmt.Println(itemsKV[0]) | |
fmt.Println(itemsKV[1]) | |
fmt.Println(itemsKV[2]) | |
println("Done Printing # KV") | |
Connection, e = DBFS.Create(DBFILE) | |
Check(e) | |
w = table.NewWriter(Connection, nil) | |
defer w.Close() | |
e = w.Set([]byte("4"), []byte("green"), nil) | |
Check(e) | |
e = w.Set([]byte("5"), []byte("white"), nil) | |
Check(e) | |
e = w.Set([]byte("6"), []byte("black"), nil) | |
Check(e) | |
e = w.Close() | |
Check(e) | |
} | |
func count() { | |
Connection, e := DBFS.Open(DBFILE) | |
Check(e) | |
b := []byte("0") | |
r := table.NewReader(Connection, nil) | |
println("\n\n###### Counting ###### ") | |
iter, n := r.Find(b, nil), 0 | |
for iter.Next() { | |
n++ | |
println("Count # ", n) | |
} | |
e = r.Close() | |
Check(e) | |
println("#####Total: ", n) | |
} | |
func read() map[int64]string { | |
Connection, e := DBFS.Open(DBFILE) | |
Check(e) | |
b := []byte("0") | |
r := table.NewReader(Connection, nil) | |
items := map[int64]string{} | |
iter, _ := r.Find(b, nil), 0 | |
for iter.Next() { | |
k := iter.Key() | |
v := iter.Value() | |
items[int64(k[0])] = string(v) | |
} | |
e = r.Close() | |
Check(e) | |
return items | |
} | |
func readByte() map[int]kv { | |
Connection, e := DBFS.Open(DBFILE) | |
Check(e) | |
c := 0 | |
b := []byte("0") | |
r := table.NewReader(Connection, nil) | |
//items := map[int64]kv{} | |
item := new(kv) | |
items := map[int]kv{} | |
iter, _ := r.Find(b, nil), 0 | |
for iter.Next() { | |
k := iter.Key() | |
v := iter.Value() | |
item.PutKV(k, v) | |
items[c] = *item | |
c++ | |
} | |
e = r.Close() | |
Check(e) | |
return items | |
} | |
func findOne(k []byte) []byte { | |
Connection, e := DBFS.Open(DBFILE) | |
Check(e) | |
b := []byte("0") | |
r := table.NewReader(Connection, nil) | |
iter, _ := r.Find(b, nil), 0 | |
k = iter.Key() | |
v := iter.Value() | |
e = r.Close() | |
Check(e) | |
return v | |
} |
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