add dao files

pkg/datastore/database.go

@@ -0,0 +1,27 @@
+package datastore
+
+import "xorm.io/xorm"
+
+type Database struct {
+	*xorm.EngineGroup
+}
+
+func (db *Database) DoTranscation(fn func(sess *xorm.Session) error) (err error) {
+	sess := db.NewSession()
+	defer sess.Close()
+
+	if err = sess.Begin(); err != nil {
+		return err
+	}
+
+	if err = fn(sess); err != nil {
+		_ = sess.Rollback()
+		return err
+	}
+
+	if err = sess.Commit(); err != nil {
+		return err
+	}
+
+	return nil
+}