diff --git a/csvreader.go b/csvreader.go
deleted file mode 100644
index 006f131..0000000
--- a/csvreader.go
+++ /dev/null
@@ -1,63 +0,0 @@
-package q5
-
-import "io"
-import "os"
-import "bufio"
-import "strings"
-
-type CsvReader struct {
-	columns map[string]int32
-	values []string
-
-	currLine int
-	lines []string
-}
-
-func (this *CsvReader) Load(fileName string) bool {
-	this.columns = map[string]int32{}
-	this.values = []string{}
-	this.currLine = 0
-	this.lines = []string{}
-
-	f, err := os.Open(fileName)
-	if err == nil {
-		defer f.Close()
-
-		br := bufio.NewReader(f)
-		for {
-			line, _, c := br.ReadLine()
-			if c == io.EOF {
-				break
-			}
-			this.lines = append(this.lines, string(line))
-		}
-	}
-	return err == nil
-}
-
-func (this *CsvReader) NextLine() bool {
-	if this.currLine >= len(this.lines) {
-		return false
-	}
-	this.values = strings.Split(this.lines[this.currLine], ",")
-	this.currLine++
-	return true
-}
-
-func (this *CsvReader) GetValue(fieldName string) *XValue {
-	index, ok := this.columns[fieldName]
-	if ok {
-		if index >= 0 && index < int32(len(this.values)) {
-			return (&XValue{}).SetString(this.values[index])
-		} else {
-			return &XValue{}
-		}
-	} else {
-		return &XValue{}
-	}
-}
-
-func (this *CsvReader) KeyExists(fieldName string) bool {
-	_, ok := this.columns[fieldName]
-	return ok
-}
diff --git a/mutable_xobject.go b/mutable_xobject.go
new file mode 100644
index 0000000..be20a95
--- /dev/null
+++ b/mutable_xobject.go
@@ -0,0 +1,25 @@
+package q5
+
+type MutableXObject struct {
+	XObject
+}
+
+func (this *MutableXObject) PushXValue(val *XValue) *MutableXObject{
+	return this
+}
+
+func (this *MutableXObject) PushMutableXObject(val MutableXObject) *MutableXObject{
+	return this
+}
+
+func (this *MutableXObject) SetXValue(key string, val *XValue) *MutableXObject{
+	return this
+}
+
+func (this *MutableXObject) SetXObject(key string, val *XObject) *MutableXObject{
+	return this
+}
+
+func (this *MutableXObject) SetMutableXObject(key string, val *MutableXObject) *MutableXObject{
+	return this
+}
diff --git a/strutils.go b/strutils.go
index 884aa50..fab4c2c 100644
--- a/strutils.go
+++ b/strutils.go
@@ -1,7 +1,9 @@
 package q5
 
+import "io"
 import "crypto/md5"
 import "encoding/hex"
+import "hash/crc32"
 
 func Test()(a string) {
 	return "testb"
@@ -12,3 +14,11 @@ func Md5Str(data string) string {
 	h.Write([]byte(data))
 	return hex.EncodeToString(h.Sum(nil))
 }
+
+func Crc32(data string) uint32 {
+	ieee := crc32.NewIEEE()
+	io.WriteString(ieee, data)
+
+	code := ieee.Sum32()
+	return code
+}
diff --git a/sysutils.go b/sysutils.go
index ccfaf29..9c9b345 100644
--- a/sysutils.go
+++ b/sysutils.go
@@ -1,5 +1,6 @@
 package q5
 
+import "net"
 import "net/http"
 import "time"
 
@@ -29,3 +30,20 @@ func Request(r *http.Request, name string) *XValue {
 	}
 	return v
 }
+
+func GetRequestRemoteAddr(r *http.Request) string {
+	remoteAddr := r.RemoteAddr
+	if ip := r.Header.Get("X-Real-Ip"); ip != "" {
+		remoteAddr = ip
+	} else if ip = r.Header.Get("X-Forwarded-For"); ip != "" {
+		remoteAddr = ip
+	} else {
+		remoteAddr, _, _ = net.SplitHostPort(remoteAddr)
+	}
+
+	if remoteAddr == "::1" {
+		remoteAddr = "127.0.0.1"
+	}
+
+	return remoteAddr
+}
diff --git a/xobject.go b/xobject.go
index 1e595c0..2122b76 100644
--- a/xobject.go
+++ b/xobject.go
@@ -11,6 +11,61 @@ type XObject struct {
 	_val interface{}
 }
 
+func (this *XObject) Size(key interface{}) int32 {
+	return 0
+}
+
+func (this *XObject) Reset() {
+}
+
+func (this *XObject) GetType() int8{
+	return this._type
+}
+
 func (this *XObject) AsXValue() *XValue {
 	return nil
 }
+
+func (this *XObject) At(key interface{}) *XObject {
+	return nil
+}
+
+func (this *XObject) Get(key interface{}) *XValue {
+	return nil
+}
+
+func (this *XObject) HasKey(key interface{}) bool {
+	return false
+}
+
+func (this *XObject) ReadFromFile(fileName string) bool {
+	return false
+}
+
+func (this *XObject) ReadFromJsonFile(fileName string) bool {
+	return false
+}
+
+func (this *XObject) ReadFromJsonString(data string) bool {
+	return false
+}
+
+func (this *XObject) ReadFromXmlFile(fileName string) bool {
+	return false
+}
+
+func (this *XObject) ReadFromXmlString(data string) bool {
+	return false
+}
+
+func (this *XObject) ReadFromUrlQueryString(data string) bool {
+	return false
+}
+
+func (this *XObject) ToJsonStr() string {
+	return ""
+}
+
+func (this *XObject) ToUrlEncodeSr() string {
+	return ""
+}
diff --git a/xvalue.go b/xvalue.go
index 5dd2ec1..bf17cb9 100644
--- a/xvalue.go
+++ b/xvalue.go
@@ -5,7 +5,8 @@ import (
 )
 
 const (
-	XVT_INT = 0
+	XVT_UNDEFINED = 0
+	XVT_INT = iota
 	XVT_FLOAT = iota
 	XVT_STRING = iota
 	XVT_BYTES = iota
@@ -19,7 +20,45 @@ type XValue struct
 }
 
 func (this *XValue) GetType() int8 {
-	return this._type
+	if this._type == XVT_UNDEFINED {
+		return XVT_INT
+	} else {
+		return this._type
+	}
+}
+
+func (this *XValue) IsUndefined() bool {
+	return this._type == XVT_UNDEFINED
+}
+
+func (this *XValue) SetUInt8(val uint8) *XValue {
+	this.SetInt64(int64(val))
+	return this
+}
+
+func (this *XValue) SetInt8(val int8) *XValue {
+	this.SetInt64(int64(val))
+	return this
+}
+
+func (this *XValue) SetUInt16(val uint16) *XValue {
+	this.SetInt64(int64(val))
+	return this
+}
+
+func (this *XValue) SetInt16(val int16) *XValue {
+	this.SetInt64(int64(val))
+	return this
+}
+
+func (this *XValue) SetUInt32(val uint32) *XValue {
+	this.SetInt64(int64(val))
+	return this
+}
+
+func (this *XValue) SetInt32(val int32) *XValue {
+	this.SetInt64(int64(val))
+	return this
 }
 
 func (this *XValue) SetInt64(val int64) *XValue {
@@ -29,6 +68,11 @@ func (this *XValue) SetInt64(val int64) *XValue {
 	return this
 }
 
+func (this *XValue) SetFloat32(val float32) *XValue {
+	this.SetFloat64(float64(val))
+	return this
+}
+
 func (this *XValue) SetFloat64(val float64) *XValue {
 	val_copy := val
 	this._type = XVT_FLOAT
@@ -37,7 +81,7 @@ func (this *XValue) SetFloat64(val float64) *XValue {
 }
 
 func (this *XValue) SetString(val string) *XValue {
-	val_copy := "" + val
+	val_copy := val + ""
 	this._type = XVT_STRING
 	this._val = &val_copy
 	return this
@@ -57,6 +101,26 @@ func (this *XValue) SetUserData(val interface{}) *XValue {
 	return this
 }
 
+func (this *XValue) GetUInt8() uint8 {
+	return uint8(this.GetInt64())
+}
+
+func (this *XValue) GetInt8() int8 {
+	return int8(this.GetInt64())
+}
+
+func (this *XValue) GetUInt16() uint16 {
+	return uint16(this.GetInt64())
+}
+
+func (this *XValue) GetInt16() int16 {
+	return int16(this.GetInt64())
+}
+
+func (this *XValue) GetUInt32() uint32 {
+	return uint32(this.GetInt64())
+}
+
 func (this *XValue) GetInt32() int32 {
 	return int32(this.GetInt64())
 }
@@ -84,11 +148,50 @@ func (this *XValue) GetInt64() int64 {
 	}
 }
 
+func (this *XValue) GetFloat32() float32 {
+	return float32(this.GetFloat64())
+}
+
+func (this *XValue) GetFloat64() float64 {
+	switch this._type {
+	case XVT_INT:
+		return float64(*(this._val.(*int64)))
+	case XVT_FLOAT:
+		return *(this._val.(*float64))
+	case XVT_STRING, XVT_BYTES, XVT_USERDATA:
+		val, err := strconv.ParseFloat(this.GetString(), 64)
+		if err == nil {
+			return val
+		} else {
+			val, err := strconv.ParseInt(this.GetString(), 10, 64)
+			if err == nil {
+				return float64(val)
+			} else {
+				return 0
+			}
+		}
+	default:
+		return 0
+	}
+}
+
 func (this *XValue) GetString() string {
 	switch this._type {
+	case XVT_INT:
+		return strconv.FormatInt(this.GetInt64(), 10)
+	case XVT_FLOAT:
+		return strconv.FormatFloat(this.GetFloat64(), 'E', -1, 64)
 	case XVT_STRING:
 		return *(this._val.(*string))
 	default:
 		return ""
 	}
 }
+
+func (this *XValue) GetUserData() interface{} {
+	if this._type == XVT_USERDATA {
+		return this._val
+	} else {
+		return nil
+	}
+}