diff --git a/db/alias.go b/db/alias.go
index 83d4b1791809df79b5b2f9bd483d3f40fdd6de99..6156fffda28854fe678161ac438eafd54ce00454 100644
--- a/db/alias.go
+++ b/db/alias.go
@@ -16,130 +16,137 @@
 package db
 
 import (
-    "gitee.com/go-libs/db-xorm/db/src"
-    "gitee.com/go-libs/db-xorm/db/types"
+	"gitee.com/go-libs/db-xorm/db/commands/model"
+	"gitee.com/go-libs/db-xorm/db/commands/service"
+	"gitee.com/go-libs/db-xorm/db/src"
+	"gitee.com/go-libs/db-xorm/db/types"
 )
 
 // Alias for xorm.
 
 type (
-    Session = src.Session
+	Session = src.Session
 )
 
 // Alias for src.
 
 var (
-    // Config
-    // is an alias for src.Config. You can open a master or slave connect
-    // session like follows.
-    //
-    // Master:
-    //   session, err := db.Config.GetMaster(ctx)
-    //
-    // Slave:
-    //   session, err := db.Config.GetSlave(ctx)
-    Config = src.Config
-
-    // Transaction
-    // is an alias for src.Transaction.
-    Transaction = src.Transaction
-
-    // TransactionWithSession
-    // is an alias for src.Transaction.
-    TransactionWithSession = src.TransactionWithSession
+	// Config
+	// is an alias for src.Config. You can open a master or slave connect
+	// session like follows.
+	//
+	// Master:
+	//   session, err := db.Config.GetMaster(ctx)
+	//
+	// Slave:
+	//   session, err := db.Config.GetSlave(ctx)
+	Config = src.Config
+
+	// Transaction
+	// is an alias for src.Transaction.
+	Transaction = src.Transaction
+
+	// TransactionWithSession
+	// is an alias for src.Transaction.
+	TransactionWithSession = src.TransactionWithSession
 )
 
 type (
-    // Database
-    // is an alias for database connection configuration.
-    //
-    // File: configure in config/db.yaml like follows:
-    //
-    //   database:
-    //     my:
-    //       driver: mysql
-    //       dsn:
-    //         - user:pass@tcp(127.0.0.1)/name?charset=utf8
-    //
-    // Code: in your code like follows:
-    //
-    //    db.Config.Add("my", &db.Database{
-    //        Driver: "mysql",
-    //        Dsn: []string{
-    //            "user:pass@tcp(127.0.0.1)/name?charset=utf8",
-    //        },
-    //    })
-    //
-    // Usage:
-    //
-    //   db.Config.GetMaster(ctx, "my")
-    //   db.Config.GetSlave(ctx, "my")
-    Database = src.Database
-
-    // Service
-    // is an alias for src.Service. It's a top level service. You can
-    // import it as an anonymous.
-    //
-    // Definition:
-    //
-    //   type YourService struct {
-    //       db.Service
-    //   }
-    //
-    //   func NewYourService(sessions ... *db.Session) *YourService {
-    //       service := &YourService{}
-    //       service.With(sessions...)
-    //       return service
-    //   }
-    //
-    //   func (o *YourService) List(ctx context.Context)(list []models.Example, err error){
-    //       var session *db.Session
-    //
-    //        if session, err = o.Slave(ctx); err != nil {
-    //            return
-    //        }
-    //
-    //        err = session.Find(&list)
-    //        return
-    //   }
-    //
-    // Usage:
-    //
-    //   svc := services.NewYourService()
-    //   list, err := svc.List(ctx)
-    Service = src.Service
-
-    // TransactionHandler
-    // is an alias hook for src.TransactionHandler. Do not run handler
-    // in goroutine for each transaction.
-    TransactionHandler = src.TransactionHandler
+	// Database
+	// is an alias for database connection configuration.
+	//
+	// File: configure in config/db.yaml like follows:
+	//
+	//   database:
+	//     my:
+	//       driver: mysql
+	//       dsn:
+	//         - user:pass@tcp(127.0.0.1)/name?charset=utf8
+	//
+	// Code: in your code like follows:
+	//
+	//    db.Config.Add("my", &db.Database{
+	//        Driver: "mysql",
+	//        Dsn: []string{
+	//            "user:pass@tcp(127.0.0.1)/name?charset=utf8",
+	//        },
+	//    })
+	//
+	// Usage:
+	//
+	//   db.Config.GetMaster(ctx, "my")
+	//   db.Config.GetSlave(ctx, "my")
+	Database = src.Database
+
+	// Service
+	// is an alias for src.Service. It's a top level service. You can
+	// import it as an anonymous.
+	//
+	// Definition:
+	//
+	//   type YourService struct {
+	//       db.Service
+	//   }
+	//
+	//   func NewYourService(sessions ... *db.Session) *YourService {
+	//       service := &YourService{}
+	//       service.With(sessions...)
+	//       return service
+	//   }
+	//
+	//   func (o *YourService) List(ctx context.Context)(list []models.Example, err error){
+	//       var session *db.Session
+	//
+	//        if session, err = o.Slave(ctx); err != nil {
+	//            return
+	//        }
+	//
+	//        err = session.Find(&list)
+	//        return
+	//   }
+	//
+	// Usage:
+	//
+	//   svc := services.NewYourService()
+	//   list, err := svc.List(ctx)
+	Service = src.Service
+
+	// TransactionHandler
+	// is an alias hook for src.TransactionHandler. Do not run handler
+	// in goroutine for each transaction.
+	TransactionHandler = src.TransactionHandler
 )
 
 // Definitions.
 
 var (
-    // NewDate
-    // is an alias for types.NewDate.
-    NewDate = types.NewDate
+	// NewDate
+	// is an alias for types.NewDate.
+	NewDate = types.NewDate
 
-    // NewDatetime
-    // is an alias for types.NewDatetime.
-    NewDatetime = types.NewDatetime
+	// NewDatetime
+	// is an alias for types.NewDatetime.
+	NewDatetime = types.NewDatetime
 )
 
 // Now
 // is an alias for src.Now. It's returned a Datetime type of
 // current time.
 func Now() types.Datetime {
-    return NewDatetime()
+	return NewDatetime()
 }
 
 type (
-    // Date
-    // is an alias for types.Date. It's a wrapper of time.Time.
-    Date = types.Date
+	// Date
+	// is an alias for types.Date. It's a wrapper of time.Time.
+	Date = types.Date
 
-    // Datetime
-    // is an alias for types.Datetime. It's a wrapper of time.Time.
-    Datetime = types.Datetime
+	// Datetime
+	// is an alias for types.Datetime. It's a wrapper of time.Time.
+	Datetime = types.Datetime
+)
+
+var (
+	NewGenModelCommand   = model.New
+	NewGenServiceCommand = service.New
 )