diff --git a/engine.go b/engine.go
index 354ed0a..38a18e2 100644
--- a/engine.go
+++ b/engine.go
@@ -248,6 +248,11 @@ func (engine *Engine) AutoIncrStr() string {
 	return engine.dialect.AutoIncrStr()
 }
 
+// SetConnMaxLifetime sets the maximum amount of time a connection may be reused.
+func (engine *Engine) SetConnMaxLifetime(d time.Duration) {
+	engine.db.SetConnMaxLifetime(d)
+}
+
 // SetMaxOpenConns is only available for go 1.2+
 func (engine *Engine) SetMaxOpenConns(conns int) {
 	engine.db.SetMaxOpenConns(conns)
diff --git a/engine_group.go b/engine_group.go
index 1adc59b..5de96bb 100644
--- a/engine_group.go
+++ b/engine_group.go
@@ -5,6 +5,8 @@
 package xorm
 
 import (
+	"time"
+
 	"github.com/xormplus/core"
 )
 
@@ -99,6 +101,14 @@ func (eg *EngineGroup) SetColumnMapper(mapper core.IMapper) {
 	}
 }
 
+// SetConnMaxLifetime sets the maximum amount of time a connection may be reused.
+func (eg *EngineGroup) SetConnMaxLifetime(d time.Duration) {
+	eg.Engine.SetConnMaxLifetime(d)
+	for i := 0; i < len(eg.slaves); i++ {
+		eg.slaves[i].SetConnMaxLifetime(d)
+	}
+}
+
 // SetDefaultCacher set the default cacher
 func (eg *EngineGroup) SetDefaultCacher(cacher core.Cacher) {
 	eg.Engine.SetDefaultCacher(cacher)
diff --git a/engine_maxlife.go b/engine_maxlife.go
deleted file mode 100644
index 22666c5..0000000
--- a/engine_maxlife.go
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright 2017 The Xorm Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build go1.6
-
-package xorm
-
-import "time"
-
-// SetConnMaxLifetime sets the maximum amount of time a connection may be reused.
-func (engine *Engine) SetConnMaxLifetime(d time.Duration) {
-	engine.db.SetConnMaxLifetime(d)
-}
-
-// SetConnMaxLifetime sets the maximum amount of time a connection may be reused.
-func (eg *EngineGroup) SetConnMaxLifetime(d time.Duration) {
-	eg.Engine.SetConnMaxLifetime(d)
-	for i := 0; i < len(eg.slaves); i++ {
-		eg.slaves[i].SetConnMaxLifetime(d)
-	}
-}
diff --git a/interface.go b/interface.go
index 7204b99..e0930ba 100644
--- a/interface.go
+++ b/interface.go
@@ -74,6 +74,7 @@ type EngineInterface interface {
 
 	Before(func(interface{})) *Session
 	Charset(charset string) *Session
+	ClearCache(...interface{}) error
 	CreateTables(...interface{}) error
 	DBMetas() ([]*core.Table, error)
 	Dialect() core.Dialect
@@ -85,16 +86,22 @@ type EngineInterface interface {
 	GetTableMapper() core.IMapper
 	GetTZDatabase() *time.Location
 	GetTZLocation() *time.Location
+	MapCacher(interface{}, core.Cacher) error
 	NewSession() *Session
 	NoAutoTime() *Session
 	Quote(string) string
 	SetCacher(string, core.Cacher)
+	SetConnMaxLifetime(time.Duration)
 	SetDefaultCacher(core.Cacher)
+	SetLogger(logger core.ILogger)
 	SetLogLevel(core.LogLevel)
 	SetMapper(core.IMapper)
+	SetMaxOpenConns(int)
+	SetMaxIdleConns(int)
 	SetSchema(string)
 	SetTZDatabase(tz *time.Location)
 	SetTZLocation(tz *time.Location)
+	ShowExecTime(...bool)
 	ShowSQL(show ...bool)
 	Sync(...interface{}) error
 	Sync2(...interface{}) error
diff --git a/xorm.go b/xorm.go
index b9b93e2..3fa0995 100644
--- a/xorm.go
+++ b/xorm.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.8
+
 package xorm
 
 import (
@@ -17,7 +19,7 @@ import (
 
 const (
 	// Version show the xorm's version
-	Version string = "0.7.0.0624"
+	Version string = "0.7.0.0908"
 )
 
 func regDrvsNDialects() bool {