diff --git a/engine.go b/engine.go
index 9aaa8a32..d85fe90e 100644
--- a/engine.go
+++ b/engine.go
@@ -96,23 +96,11 @@ func (engine *Engine) NoCache() *Session {
 }
 
 func (engine *Engine) MapCacher(bean interface{}, cacher Cacher) {
-	t := Type(bean)
+	t := rType(bean)
 	engine.AutoMapType(t)
 	engine.Tables[t].Cacher = cacher
 }
 
-func Type(bean interface{}) reflect.Type {
-	sliceValue := reflect.Indirect(reflect.ValueOf(bean))
-	return reflect.TypeOf(sliceValue.Interface())
-}
-
-func StructName(v reflect.Type) string {
-	for v.Kind() == reflect.Ptr {
-		v = v.Elem()
-	}
-	return v.Name()
-}
-
 func (e *Engine) OpenDB() (*sql.DB, error) {
 	return sql.Open(e.DriverName, e.DataSourceName)
 }
@@ -274,7 +262,7 @@ func (engine *Engine) AutoMapType(t reflect.Type) *Table {
 }
 
 func (engine *Engine) AutoMap(bean interface{}) *Table {
-	t := Type(bean)
+	t := rType(bean)
 	return engine.AutoMapType(t)
 }
 
@@ -465,7 +453,7 @@ func (engine *Engine) Map(beans ...interface{}) (e error) {
 	engine.mutex.Lock()
 	defer engine.mutex.Unlock()
 	for _, bean := range beans {
-		t := Type(bean)
+		t := rType(bean)
 		engine.Tables[t] = engine.MapType(t)
 	}
 	return
@@ -473,7 +461,7 @@ func (engine *Engine) Map(beans ...interface{}) (e error) {
 
 // is a table has
 func (engine *Engine) IsEmptyTable(bean interface{}) (bool, error) {
-	t := Type(bean)
+	t := rType(bean)
 	if t.Kind() != reflect.Struct {
 		return false, errors.New("bean should be a struct or struct's point")
 	}
@@ -485,7 +473,7 @@ func (engine *Engine) IsEmptyTable(bean interface{}) (bool, error) {
 }
 
 func (engine *Engine) IsTableExist(bean interface{}) (bool, error) {
-	t := Type(bean)
+	t := rType(bean)
 	if t.Kind() != reflect.Struct {
 		return false, errors.New("bean should be a struct or struct's point")
 	}
@@ -497,7 +485,7 @@ func (engine *Engine) IsTableExist(bean interface{}) (bool, error) {
 }
 
 func (engine *Engine) ClearCacheBean(bean interface{}, id int64) error {
-	t := Type(bean)
+	t := rType(bean)
 	if t.Kind() != reflect.Struct {
 		return errors.New("error params")
 	}
@@ -511,7 +499,7 @@ func (engine *Engine) ClearCacheBean(bean interface{}, id int64) error {
 
 func (engine *Engine) ClearCache(beans ...interface{}) error {
 	for _, bean := range beans {
-		t := Type(bean)
+		t := rType(bean)
 		if t.Kind() != reflect.Struct {
 			return errors.New("error params")
 		}
@@ -622,7 +610,7 @@ func (engine *Engine) UnMap(beans ...interface{}) (e error) {
 	engine.mutex.Lock()
 	defer engine.mutex.Unlock()
 	for _, bean := range beans {
-		t := Type(bean)
+		t := rType(bean)
 		if _, ok := engine.Tables[t]; ok {
 			delete(engine.Tables, t)
 		}
diff --git a/helpers.go b/helpers.go
index eb24e341..383c66b5 100644
--- a/helpers.go
+++ b/helpers.go
@@ -1,25 +1,46 @@
 package xorm
 
 import (
+	"reflect"
 	"strings"
 )
 
-func IndexNoCase(s, sep string) int {
+func indexNoCase(s, sep string) int {
 	return strings.Index(strings.ToLower(s), strings.ToLower(sep))
 }
 
-func SplitNoCase(s, sep string) []string {
-	idx := IndexNoCase(s, sep)
+func splitNoCase(s, sep string) []string {
+	idx := indexNoCase(s, sep)
 	if idx < 0 {
 		return []string{s}
 	}
 	return strings.Split(s, s[idx:idx+len(sep)])
 }
 
-func SplitNNoCase(s, sep string, n int) []string {
-	idx := IndexNoCase(s, sep)
+func splitNNoCase(s, sep string, n int) []string {
+	idx := indexNoCase(s, sep)
 	if idx < 0 {
 		return []string{s}
 	}
 	return strings.SplitN(s, s[idx:idx+len(sep)], n)
 }
+
+func makeArray(elem string, count int) []string {
+	res := make([]string, count)
+	for i := 0; i < count; i++ {
+		res[i] = elem
+	}
+	return res
+}
+
+func rType(bean interface{}) reflect.Type {
+	sliceValue := reflect.Indirect(reflect.ValueOf(bean))
+	return reflect.TypeOf(sliceValue.Interface())
+}
+
+func structName(v reflect.Type) string {
+	for v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+	return v.Name()
+}
diff --git a/mapper.go b/mapper.go
index 8a781971..224658bb 100644
--- a/mapper.go
+++ b/mapper.go
@@ -44,7 +44,7 @@ func snakeCasedName(name string) string {
 	return string(newstr)
 }
 
-func Pascal2Sql(s string) (d string) {
+func pascal2Sql(s string) (d string) {
 	d = ""
 	lastIdx := 0
 	for i := 0; i < len(s); i++ {
diff --git a/session.go b/session.go
index f44f0fc6..ac9c82ff 100644
--- a/session.go
+++ b/session.go
@@ -201,7 +201,7 @@ func (session *Session) scanMapIntoStruct(obj interface{}, objMap map[string][]b
 		return errors.New("Expected a pointer to a struct")
 	}
 
-	table := session.Engine.Tables[Type(obj)]
+	table := session.Engine.Tables[rType(obj)]
 
 	for key, data := range objMap {
 		if _, ok := table.Columns[key]; !ok {
@@ -709,7 +709,7 @@ func (session *Session) Find(rowsSlicePtr interface{}, condiBean ...interface{})
 	session.Statement.RefTable = table
 
 	if len(condiBean) > 0 {
-		colNames, args := BuildConditions(session.Engine, table, condiBean[0])
+		colNames, args := buildConditions(session.Engine, table, condiBean[0])
 		session.Statement.ConditionStr = strings.Join(colNames, " and ")
 		session.Statement.BeanArgs = args
 	}
@@ -1038,7 +1038,7 @@ func (session *Session) innerInsertMulti(rowsSlicePtr interface{}) (int64, error
 	}
 
 	bean := sliceValue.Index(0).Interface()
-	sliceElementType := Type(bean)
+	sliceElementType := rType(bean)
 
 	table := session.Engine.AutoMapType(sliceElementType)
 	session.Statement.RefTable = table
@@ -1520,12 +1520,12 @@ func (session *Session) cacheUpdate(sql string, args ...interface{}) error {
 
 	for _, id := range ids {
 		if bean := cacher.GetBean(tableName, id); bean != nil {
-			sqls := SplitNNoCase(sql, "where", 2)
+			sqls := splitNNoCase(sql, "where", 2)
 			if len(sqls) != 2 {
 				return ErrCacheFailed
 			}
 
-			sqls = SplitNNoCase(sqls[0], "set", 2)
+			sqls = splitNNoCase(sqls[0], "set", 2)
 			if len(sqls) != 2 {
 				return ErrCacheFailed
 			}
@@ -1567,7 +1567,7 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 		defer session.Close()
 	}
 
-	t := Type(bean)
+	t := rType(bean)
 
 	var colNames []string
 	var args []interface{}
@@ -1578,7 +1578,7 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 		session.Statement.RefTable = table
 
 		if session.Statement.ColumnStr == "" {
-			colNames, args = BuildConditions(session.Engine, table, bean)
+			colNames, args = buildConditions(session.Engine, table, bean)
 		} else {
 			colNames, args, err = table.GenCols(session, bean, true, true)
 			if err != nil {
@@ -1614,7 +1614,7 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 	var condiArgs []interface{}
 
 	if len(condiBean) > 0 {
-		condiColNames, condiArgs = BuildConditions(session.Engine, session.Statement.RefTable, condiBean[0])
+		condiColNames, condiArgs = buildConditions(session.Engine, session.Statement.RefTable, condiBean[0])
 	}
 
 	var condition = ""
@@ -1714,7 +1714,7 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 
 	table := session.Engine.AutoMap(bean)
 	session.Statement.RefTable = table
-	colNames, args := BuildConditions(session.Engine, table, bean)
+	colNames, args := buildConditions(session.Engine, table, bean)
 
 	var condition = ""
 	if session.Statement.WhereStr != "" {
diff --git a/statement.go b/statement.go
index e21467ca..7d68069f 100644
--- a/statement.go
+++ b/statement.go
@@ -35,14 +35,6 @@ type Statement struct {
 	UseAutoTime  bool
 }
 
-func MakeArray(elem string, count int) []string {
-	res := make([]string, count)
-	for i := 0; i < count; i++ {
-		res[i] = elem
-	}
-	return res
-}
-
 func (statement *Statement) Init() {
 	statement.RefTable = nil
 	statement.Start = 0
@@ -76,7 +68,7 @@ func (statement *Statement) Where(querystring string, args ...interface{}) {
 }
 
 func (statement *Statement) Table(tableNameOrBean interface{}) {
-	t := Type(tableNameOrBean)
+	t := rType(tableNameOrBean)
 	if t.Kind() == reflect.String {
 		statement.AltTableName = tableNameOrBean.(string)
 	} else if t.Kind() == reflect.Struct {
@@ -84,7 +76,7 @@ func (statement *Statement) Table(tableNameOrBean interface{}) {
 	}
 }
 
-func BuildConditions(engine *Engine, table *Table, bean interface{}) ([]string, []interface{}) {
+func buildConditions(engine *Engine, table *Table, bean interface{}) ([]string, []interface{}) {
 	colNames := make([]string, 0)
 	var args = make([]interface{}, 0)
 	for _, col := range table.Columns {
@@ -196,7 +188,7 @@ func (statement *Statement) Id(id int64) {
 }
 
 func (statement *Statement) In(column string, args ...interface{}) {
-	inStr := fmt.Sprintf("%v IN (%v)", column, strings.Join(MakeArray("?", len(args)), ","))
+	inStr := fmt.Sprintf("%v IN (%v)", column, strings.Join(makeArray("?", len(args)), ","))
 	if statement.WhereStr == "" {
 		statement.WhereStr = inStr
 		statement.Params = args
@@ -337,7 +329,7 @@ func (statement Statement) genGetSql(bean interface{}) (string, []interface{}) {
 	table := statement.Engine.AutoMap(bean)
 	statement.RefTable = table
 
-	colNames, args := BuildConditions(statement.Engine, table, bean)
+	colNames, args := buildConditions(statement.Engine, table, bean)
 	statement.ConditionStr = strings.Join(colNames, " and ")
 	statement.BeanArgs = args
 
@@ -374,7 +366,7 @@ func (statement Statement) genCountSql(bean interface{}) (string, []interface{})
 	table := statement.Engine.AutoMap(bean)
 	statement.RefTable = table
 
-	colNames, args := BuildConditions(statement.Engine, table, bean)
+	colNames, args := buildConditions(statement.Engine, table, bean)
 	statement.ConditionStr = strings.Join(colNames, " and ")
 	statement.BeanArgs = args
 	return statement.genSelectSql(fmt.Sprintf("count(*) as %v", statement.Engine.Quote("total"))), append(statement.Params, statement.BeanArgs...)