diff --git a/pkg/datastore/database.go b/pkg/datastore/database.go
index 083a686c..82b7577a 100644
--- a/pkg/datastore/database.go
+++ b/pkg/datastore/database.go
@@ -2,10 +2,12 @@ package datastore
 
 import "xorm.io/xorm"
 
+// Database represents a database instance
 type Database struct {
 	*xorm.EngineGroup
 }
 
+// DoTransaction runs a new database transaction
 func (db *Database) DoTransaction(fn func(sess *xorm.Session) error) (err error) {
 	sess := db.NewSession()
 	defer sess.Close()
diff --git a/pkg/datastore/datastore.go b/pkg/datastore/datastore.go
index 1d9fa6ae..a9a18ea4 100644
--- a/pkg/datastore/datastore.go
+++ b/pkg/datastore/datastore.go
@@ -6,22 +6,27 @@ import (
 	"github.com/mayswind/lab/pkg/errs"
 )
 
+// DataStore represents a data storage containing a series of database shards
 type DataStore struct {
 	databases []*Database
 }
 
+// Choose returns a database instance by sharding key
 func (s *DataStore) Choose(key int64) *Database {
 	return s.databases[0]
 }
 
+// Query returns a new database session in a specific database by sharding key
 func (s *DataStore) Query(key int64) *xorm.Session {
 	return s.Choose(key).NewSession()
 }
 
+// DoTransaction runs a new database transaction in a specific database by sharding key
 func (s *DataStore) DoTransaction(key int64, fn func(sess *xorm.Session) error) (err error) {
 	return s.Choose(key).DoTransaction(fn)
 }
 
+// SyncStructs updates database structs by database models
 func (s *DataStore) SyncStructs(beans ...interface{}) error {
 	var err error
 
@@ -36,6 +41,7 @@ func (s *DataStore) SyncStructs(beans ...interface{}) error {
 	return err
 }
 
+// NewDataStore returns a new data storage by a series of database
 func NewDataStore(databases ...*Database) (*DataStore, error) {
 	if len(databases) < 1 {
 		return nil, errs.ErrDatabaseIsNull
diff --git a/pkg/datastore/datastore_container.go b/pkg/datastore/datastore_container.go
index 8401e429..58388b5b 100644
--- a/pkg/datastore/datastore_container.go
+++ b/pkg/datastore/datastore_container.go
@@ -16,16 +16,19 @@ import (
 	"github.com/mayswind/lab/pkg/settings"
 )
 
+// DataStoreContainer contains all data storages
 type DataStoreContainer struct {
 	UserStore     *DataStore
 	TokenStore    *DataStore
 	UserDataStore *DataStore
 }
 
+// Initialize a data storage container singleton instance
 var (
 	Container = &DataStoreContainer{}
 )
 
+// InitializeDataStore initializes data storage according to the config
 func InitializeDataStore(config *settings.Config) error {
 	database, err := initializeDatabase(config.DatabaseConfig)
 
diff --git a/pkg/datastore/query_log.go b/pkg/datastore/query_log.go
index c8be8fa2..954fbeb2 100644
--- a/pkg/datastore/query_log.go
+++ b/pkg/datastore/query_log.go
@@ -7,43 +7,53 @@ import (
 	"github.com/mayswind/lab/pkg/settings"
 )
 
+// XOrmLoggerAdapter represents the logger adapter for xorm
 type XOrmLoggerAdapter struct {
 	enable   bool
 	logLevel settings.Level
 }
 
+// Debug logs debug log
 func (logger XOrmLoggerAdapter) Debug(v ...interface{}) {
 	log.SqlQuery(v...)
 }
 
+// Debugf logs debug log with custom format
 func (logger XOrmLoggerAdapter) Debugf(format string, v ...interface{}) {
 	log.SqlQueryf(format, v...)
 }
 
+// Info logs info log
 func (logger XOrmLoggerAdapter) Info(v ...interface{}) {
 	log.SqlQuery(v...)
 }
 
+// Infof logs info log with custom format
 func (logger XOrmLoggerAdapter) Infof(format string, v ...interface{}) {
 	log.SqlQueryf(format, v...)
 }
 
+// Warn logs warn log
 func (logger XOrmLoggerAdapter) Warn(v ...interface{}) {
 	log.SqlQuery(v...)
 }
 
+// Warnf logs warn log with custom format
 func (logger XOrmLoggerAdapter) Warnf(format string, v ...interface{}) {
 	log.SqlQueryf(format, v...)
 }
 
+// Error logs error log
 func (logger XOrmLoggerAdapter) Error(v ...interface{}) {
 	log.SqlQuery(v...)
 }
 
+// Errorf logs error log with custom format
 func (logger XOrmLoggerAdapter) Errorf(format string, v ...interface{}) {
 	log.SqlQueryf(format, v...)
 }
 
+// Level returns the logger level
 func (logger XOrmLoggerAdapter) Level() xorm.LogLevel {
 	if logger.logLevel == settings.LOGLEVEL_DEBUG {
 		return xorm.LOG_DEBUG
@@ -58,6 +68,7 @@ func (logger XOrmLoggerAdapter) Level() xorm.LogLevel {
 	return xorm.LOG_INFO
 }
 
+// SetLevel sets the logger level
 func (logger XOrmLoggerAdapter) SetLevel(l xorm.LogLevel) {
 	if l == xorm.LOG_DEBUG {
 		logger.logLevel = settings.LOGLEVEL_DEBUG
@@ -72,14 +83,17 @@ func (logger XOrmLoggerAdapter) SetLevel(l xorm.LogLevel) {
 	logger.logLevel = settings.LOGLEVEL_INFO
 }
 
+// ShowSQL sets whether write sql to log
 func (logger XOrmLoggerAdapter) ShowSQL(show ...bool) {
 	logger.enable = len(show) > 0 && show[0]
 }
 
+// IsShowSQL returns whether write sql to log
 func (logger XOrmLoggerAdapter) IsShowSQL() bool {
 	return logger.enable
 }
 
+// NewXOrmLoggerAdapter returns a new XOrmLoggerAdapter instance
 func NewXOrmLoggerAdapter(showSql bool, logLevel settings.Level) xorm.Logger {
 	return XOrmLoggerAdapter{
 		enable:   showSql,