我正在尝试使用 leveldb-g 实现并遇到一些问题。
这是我的实现(基于此处的另一个答案
package propertyData
import (
"code.google.com/p/leveldb-go/leveldb/db"
"code.google.com/p/leveldb-go/leveldb/table"
"log"
"runtime"
)
const (
DBFILE = "./admin.db"
)
var DBFS = db.DefaultFileSystem
func AddDataToProperty(property, value string) {
Connection, e := DBFS.Create(DBFILE)
Check(e)
w := table.NewWriter(Connection, nil)
defer w.Close()
e = w.Set([]byte(property), []byte(value), nil)
}
func GetDataFromProperty(property string) string {
v := findOne([]byte(property))
return string(v)
}
func findOne(k []byte) []byte {
Connection, e := DBFS.Open(DBFILE)
Check(e)
r := table.NewReader(Connection, nil)
v1, err := r.Get([]byte(k), nil)
if err != nil {
log.Fatalf("An error occurred finding one", err.Error())
}
return v1
}
func Check(e error) {
if e != nil {
_, file, line, _ := runtime.Caller(1)
log.Fatalf("Bad Happened: %s, %s", file, line)
}
}
和一个测试:
package propertyData
import (
"com.levelsbeyond/admin/propertyData"
"log"
"os"
"testing"
)
func TestAddProperty(t *testing.T) {
os.RemoveAll("./admin.db")
propertyData.AddDataToProperty("test.property", "one")
propertyData.AddDataToProperty("test.property", "two")
propertyData.AddDataToProperty("test.property", "three")
propertyValue := propertyData.GetDataFromProperty("test.property")
log.Println(propertyValue)
propertyData.AddDataToProperty("test.different", "four")
propertyValue = propertyData.GetDataFromProperty("test.different")
log.Println(propertyValue)
propertyValue = propertyData.GetDataFromProperty("test.property")
log.Println(propertyValue)
}
哪个输出:
=== RUN TestAddProperty
2013/09/16 10:47:50 three
2013/09/16 10:47:50 four
2013/09/16 10:47:50
--- PASS: TestAddProperty (0.00 seconds)
这就像写第二个属性(“property.different”)覆盖我已经在那里的值。我确定我在做一些愚蠢的事情,任何帮助将不胜感激。
编辑
我在 findOne 函数中添加了一些错误处理(感谢@miltonb),实际上我在那里遇到了一个错误,尽管我不知道该怎么做:
=== RUN TestAddProperty
2013/09/16 15:36:34 three
2013/09/16 15:36:34 four
2013/09/16 15:36:34 An error occurred finding one%!(EXTRA string=leveldb/db: not found)
exit status 1
FAIL command-line-arguments 0.018s