improve model feature

.example/frame/mvc/model/test/init.go

@@ -0,0 +1,10 @@
+package test
+
+import (
+	"github.com/gogf/gf/database/gdb"
+	"github.com/gogf/gf/frame/g"
+)
+
+func DB() gdb.DB {
+	return g.DB()
+}

.example/frame/mvc/model/test/user.go

@@ -0,0 +1,81 @@
+package test
+
+import (
+	"database/sql"
+
+	"github.com/gogf/gf/debug/gdebug"
+	"github.com/gogf/gf/frame/gins"
+
+	"github.com/gogf/gf/database/gdb"
+	"github.com/gogf/gf/os/gtime"
+)
+
+type User struct {
+	Id         int         `orm:"id,primary"  json:"id"`
+	Passport   string      `orm:"passport"    json:"passport"`
+	Password   string      `orm:"password"    json:"password"`
+	NickName   string      `orm:"nickname"    json:"nick_name"`
+	CreateTime *gtime.Time `orm:"create_time" json:"create_time"`
+}
+
+type UserModel struct {
+	*gdb.Model
+	TableName string
+}
+
+var (
+	UserTableName      = "user"
+	gUserModelCacheKey = gdebug.CallerFilePath()
+)
+
+func ModelUser() *UserModel {
+	return gins.GetOrSetFunc(gUserModelCacheKey, func() interface{} {
+		return &UserModel{
+			DB().Table(UserTableName).Safe(),
+			UserTableName,
+		}
+	}).(*UserModel)
+}
+
+func (r *User) Insert() (result sql.Result, err error) {
+	return ModelUser().Data(r).Insert()
+}
+
+func (r *User) Replace() (result sql.Result, err error) {
+	return ModelUser().Data(r).Replace()
+}
+
+func (r *User) Save() (result sql.Result, err error) {
+	return ModelUser().Data(r).Save()
+}
+
+func (r *User) Update() (result sql.Result, err error) {
+	return ModelUser().Data(r).Where(gdb.GetWhereConditionOfStruct(r)).Update()
+}
+
+func (r *User) Delete() (result sql.Result, err error) {
+	return ModelUser().Where(gdb.GetWhereConditionOfStruct(r)).Delete()
+}
+
+func (m *UserModel) Select() ([]*User, error) {
+	return m.All()
+}
+
+func (m *UserModel) All() ([]*User, error) {
+	array := ([]*User)(nil)
+	if err := m.Scan(&array); err != nil {
+		return nil, err
+	}
+	return array, nil
+}
+
+func (m *UserModel) One() (*User, error) {
+	list, err := m.All()
+	if err != nil {
+		return nil, err
+	}
+	if len(list) > 0 {
+		return list[0], nil
+	}
+	return nil, nil
+}