some bug fixed and some function deprecated

deprecated.go

@@ -0,0 +1,19 @@
+package xorm
+
+// all content in this file will be removed from xorm some times after
+
+// @deprecation : please use NewSession instead
+func (engine *Engine) MakeSession() (Session, error) {
+	s, err := engine.NewSession()
+	if err == nil {
+		return *s, err
+	} else {
+		return Session{}, err
+	}
+}
+
+// @deprecation : please use NewEngine instead
+func Create(driverName string, dataSourceName string) Engine {
+	engine := NewEngine(driverName, dataSourceName)
+	return *engine
+}

engine.go

@@ -50,17 +50,25 @@ func (e *Engine) OpenDB() (*sql.DB, error) {
 	return sql.Open(e.DriverName, e.DataSourceName)
 }
 
-func (engine *Engine) MakeSession() (session Session, err error) {
+func (engine *Engine) NewSession() (session *Session, err error) {
 	db, err := engine.OpenDB()
 	if err != nil {
-		return Session{}, err
+		return nil, err
 	}
 
-	session = Session{Engine: engine, Db: db}
+	session = &Session{Engine: engine, Db: db}
 	session.Init()
 	return
 }
 
+func (engine *Engine) Test() error {
+	session, err := engine.NewSession()
+	if err != nil {
+		return err
+	}
+	return session.Db.Ping()
+}
+
 func (engine *Engine) Where(querystring string, args ...interface{}) *Engine {
 	engine.Statement.Where(querystring, args...)
 	return engine
@@ -260,9 +268,15 @@ func (e *Engine) DropAll() error {
 
 func (e *Engine) CreateTables(beans ...interface{}) error {
 	session, err := e.MakeSession()
-	session.Begin()
-	session.Statement = e.Statement
+	if err != nil {
+		return err
+	}
 	defer session.Close()
+	err = session.Begin()
+	if err != nil {
+		return err
+	}
+	session.Statement = e.Statement
 	defer e.Statement.Init()
 	if err != nil {
 		return err

session.go

@@ -88,14 +88,16 @@ func (session *Session) Having(conditions string) *Session {
 
 func (session *Session) Begin() error {
 	if session.IsAutoCommit {
+		tx, err := session.Db.Begin()
+		if err != nil {
+			return err
+		}
 		session.IsAutoCommit = false
 		session.IsCommitedOrRollbacked = false
-		tx, err := session.Db.Begin()
 		session.Tx = tx
 		if session.Engine.ShowSQL {
 			fmt.Println("BEGIN TRANSACTION")
 		}
-		return err
 	}
 	return nil
 }

xorm.go

@@ -4,12 +4,12 @@ import (
 	"reflect"
 )
 
-func Create(driverName string, dataSourceName string) Engine {
-	engine := Engine{ShowSQL: false, DriverName: driverName, Mapper: SnakeMapper{},
+func NewEngine(driverName string, dataSourceName string) *Engine {
+	engine := &Engine{ShowSQL: false, DriverName: driverName, Mapper: SnakeMapper{},
 		DataSourceName: dataSourceName}
 
 	engine.Tables = make(map[reflect.Type]Table)
-	engine.Statement.Engine = &engine
+	engine.Statement.Engine = engine
 	engine.InsertMany = true
 	engine.TagIdentifier = "xorm"
 	if driverName == SQLITE {