diff --git a/g/database/gdb/gdb.go b/g/database/gdb/gdb.go
index f252ab675..8a811563a 100644
--- a/g/database/gdb/gdb.go
+++ b/g/database/gdb/gdb.go
@@ -36,7 +36,7 @@ type Link interface {
     // 数据库查询
     GetAll(q string, args ...interface{}) (Result, error)
     GetOne(q string, args ...interface{}) (Record, error)
-    GetValue(q string, args ...interface{}) (interface{}, error)
+    GetValue(q string, args ...interface{}) (Value, error)
 
     // Ping
     PingMaster() error
@@ -89,7 +89,7 @@ type Db struct {
 }
 
 // 返回数据表记录值
-type Value   string
+type Value   []byte
 
 // 返回数据表记录Map
 type Record  map[string]Value
diff --git a/g/database/gdb/gdb_base.go b/g/database/gdb/gdb_base.go
index 156dfcd3f..abfc91d64 100644
--- a/g/database/gdb/gdb_base.go
+++ b/g/database/gdb/gdb_base.go
@@ -115,7 +115,7 @@ func (db *Db) GetOne(query string, args ...interface{}) (Record, error) {
 }
 
 // 数据库查询，获取查询字段值
-func (db *Db) GetValue(query string, args ...interface{}) (interface{}, error) {
+func (db *Db) GetValue(query string, args ...interface{}) (Value, error) {
     one, err := db.GetOne(query, args ...)
     if err != nil {
         return nil, err
diff --git a/g/database/gdb/gdb_model.go b/g/database/gdb/gdb_model.go
index 0551510d1..d3d4b04f6 100644
--- a/g/database/gdb/gdb_model.go
+++ b/g/database/gdb/gdb_model.go
@@ -276,15 +276,15 @@ func (md *Model) One() (Record, error) {
 }
 
 // 链式操作，查询字段值
-func (md *Model) Value() (interface{}, error) {
+func (md *Model) Value() (Value, error) {
     one, err := md.One()
     if err != nil {
-        return "", err
+        return nil, err
     }
     for _, v := range one {
         return v, nil
     }
-    return "", nil
+    return nil, nil
 }
 
 // 链式操作，查询数量，fields可以为空，也可以自定义查询字段，
diff --git a/g/database/gdb/gdb_type_value.go b/g/database/gdb/gdb_type_value.go
index 4e8fe536d..9272452a3 100644
--- a/g/database/gdb/gdb_type_value.go
+++ b/g/database/gdb/gdb_type_value.go
@@ -11,7 +11,7 @@ import (
     "gitee.com/johng/gf/g/util/gconv"
 )
 
-func (v Value) Bytes()          []byte          { return gconv.Bytes(v) }
+func (v Value) Bytes()          []byte          { return []byte(v) }
 func (v Value) String()         string          { return string(v) }
 func (v Value) Bool()           bool            { return gconv.Bool(v) }
 
diff --git a/geg/database/mysql/mysql.go b/geg/database/mysql/mysql.go
index 2e6f3a81e..ec090c63d 100644
--- a/geg/database/mysql/mysql.go
+++ b/geg/database/mysql/mysql.go
@@ -282,7 +282,7 @@ func linkopSelect3() {
     fmt.Println("linkopSelect3:")
     r, err := db.Table("user u").LeftJoin("user_detail ud", "u.uid=ud.uid").Fields("ud.site").Where("u.uid=?", 1).Value()
     if err == nil {
-        fmt.Println(r.(string))
+        fmt.Println(r.String())
     } else {
         fmt.Println(err)
     }