diff --git a/engine_go1.15.go b/engine_go1.15.go
new file mode 100644
index 00000000..add4d125
--- /dev/null
+++ b/engine_go1.15.go
@@ -0,0 +1,16 @@
+// +build go1.15
+
+package xorm
+
+import (
+	"time"
+)
+
+// SetConnMaxIdleTime sets the maximum amount of time a connection may be idle.
+//
+// Expired connections may be closed lazily before reuse.
+//
+// If d <= 0, connections are not closed due to a connection's idle time.
+func (engine *Engine) SetConnMaxIdleTime(d time.Duration) {
+	engine.DB().SetConnMaxIdleTime(d)
+}
diff --git a/engine_group_go1.15.go b/engine_group_go1.15.go
new file mode 100644
index 00000000..39394838
--- /dev/null
+++ b/engine_group_go1.15.go
@@ -0,0 +1,19 @@
+// +build go1.15
+
+package xorm
+
+import (
+	"time"
+)
+
+// SetConnMaxIdleTime sets the maximum amount of time a connection may be idle.
+//
+// Expired connections may be closed lazily before reuse.
+//
+// If d <= 0, connections are not closed due to a connection's idle time.
+func (eg *EngineGroup) SetConnMaxIdleTime(d time.Duration) {
+	eg.Engine.SetConnMaxIdleTime(d)
+	for i := 0; i < len(eg.slaves); i++ {
+		eg.slaves[i].SetConnMaxIdleTime(d)
+	}
+}
diff --git a/engine_interface.go b/engine_interface.go
new file mode 100644
index 00000000..3d55be0e
--- /dev/null
+++ b/engine_interface.go
@@ -0,0 +1,72 @@
+// +build !go1.15
+
+package xorm
+
+import (
+	"context"
+	"database/sql"
+	"reflect"
+	"time"
+
+	"xorm.io/xorm/caches"
+	"xorm.io/xorm/contexts"
+	"xorm.io/xorm/dialects"
+	"xorm.io/xorm/log"
+	"xorm.io/xorm/names"
+	"xorm.io/xorm/schemas"
+)
+
+// EngineInterface defines the interface which Engine, EngineGroup will implementate.
+type EngineInterface interface {
+	Interface
+
+	Before(func(interface{})) *Session
+	Charset(charset string) *Session
+	ClearCache(...interface{}) error
+	Context(context.Context) *Session
+	CreateTables(...interface{}) error
+	DBMetas() ([]*schemas.Table, error)
+	Dialect() dialects.Dialect
+	DriverName() string
+	DropTables(...interface{}) error
+	DumpAllToFile(fp string, tp ...schemas.DBType) error
+	GetCacher(string) caches.Cacher
+	GetColumnMapper() names.Mapper
+	GetDefaultCacher() caches.Cacher
+	GetTableMapper() names.Mapper
+	GetTZDatabase() *time.Location
+	GetTZLocation() *time.Location
+	ImportFile(fp string) ([]sql.Result, error)
+	MapCacher(interface{}, caches.Cacher) error
+	NewSession() *Session
+	NoAutoTime() *Session
+	Quote(string) string
+	SetCacher(string, caches.Cacher)
+	SetConnMaxLifetime(time.Duration)
+	SetColumnMapper(names.Mapper)
+	SetDefaultCacher(caches.Cacher)
+	SetLogger(logger interface{})
+	SetLogLevel(log.LogLevel)
+	SetMapper(names.Mapper)
+	SetMaxOpenConns(int)
+	SetMaxIdleConns(int)
+	SetQuotePolicy(dialects.QuotePolicy)
+	SetSchema(string)
+	SetTableMapper(names.Mapper)
+	SetTZDatabase(tz *time.Location)
+	SetTZLocation(tz *time.Location)
+	AddHook(hook contexts.Hook)
+	ShowSQL(show ...bool)
+	Sync(...interface{}) error
+	Sync2(...interface{}) error
+	StoreEngine(storeEngine string) *Session
+	TableInfo(bean interface{}) (*schemas.Table, error)
+	TableName(interface{}, ...bool) string
+	UnMapType(reflect.Type)
+	EnableSessionID(bool)
+}
+
+var (
+	_ EngineInterface = &Engine{}
+	_ EngineInterface = &EngineGroup{}
+)
diff --git a/engine_interface_go1.15.go b/engine_interface_go1.15.go
new file mode 100644
index 00000000..da732968
--- /dev/null
+++ b/engine_interface_go1.15.go
@@ -0,0 +1,73 @@
+// +build go1.15
+
+package xorm
+
+import (
+	"context"
+	"database/sql"
+	"reflect"
+	"time"
+
+	"xorm.io/xorm/caches"
+	"xorm.io/xorm/contexts"
+	"xorm.io/xorm/dialects"
+	"xorm.io/xorm/log"
+	"xorm.io/xorm/names"
+	"xorm.io/xorm/schemas"
+)
+
+// EngineInterface defines the interface which Engine, EngineGroup will implementate.
+type EngineInterface interface {
+	Interface
+
+	Before(func(interface{})) *Session
+	Charset(charset string) *Session
+	ClearCache(...interface{}) error
+	Context(context.Context) *Session
+	CreateTables(...interface{}) error
+	DBMetas() ([]*schemas.Table, error)
+	Dialect() dialects.Dialect
+	DriverName() string
+	DropTables(...interface{}) error
+	DumpAllToFile(fp string, tp ...schemas.DBType) error
+	GetCacher(string) caches.Cacher
+	GetColumnMapper() names.Mapper
+	GetDefaultCacher() caches.Cacher
+	GetTableMapper() names.Mapper
+	GetTZDatabase() *time.Location
+	GetTZLocation() *time.Location
+	ImportFile(fp string) ([]sql.Result, error)
+	MapCacher(interface{}, caches.Cacher) error
+	NewSession() *Session
+	NoAutoTime() *Session
+	Quote(string) string
+	SetCacher(string, caches.Cacher)
+	SetConnMaxLifetime(time.Duration)
+	SetConnMaxIdleTime(time.Duration) // only go1.15 or higher
+	SetColumnMapper(names.Mapper)
+	SetDefaultCacher(caches.Cacher)
+	SetLogger(logger interface{})
+	SetLogLevel(log.LogLevel)
+	SetMapper(names.Mapper)
+	SetMaxOpenConns(int)
+	SetMaxIdleConns(int)
+	SetQuotePolicy(dialects.QuotePolicy)
+	SetSchema(string)
+	SetTableMapper(names.Mapper)
+	SetTZDatabase(tz *time.Location)
+	SetTZLocation(tz *time.Location)
+	AddHook(hook contexts.Hook)
+	ShowSQL(show ...bool)
+	Sync(...interface{}) error
+	Sync2(...interface{}) error
+	StoreEngine(storeEngine string) *Session
+	TableInfo(bean interface{}) (*schemas.Table, error)
+	TableName(interface{}, ...bool) string
+	UnMapType(reflect.Type)
+	EnableSessionID(bool)
+}
+
+var (
+	_ EngineInterface = &Engine{}
+	_ EngineInterface = &EngineGroup{}
+)
diff --git a/interface.go b/interface.go
index 6ad0577a..ce446144 100644
--- a/interface.go
+++ b/interface.go
@@ -5,17 +5,7 @@
 package xorm
 
 import (
-	"context"
 	"database/sql"
-	"reflect"
-	"time"
-
-	"xorm.io/xorm/caches"
-	"xorm.io/xorm/contexts"
-	"xorm.io/xorm/dialects"
-	"xorm.io/xorm/log"
-	"xorm.io/xorm/names"
-	"xorm.io/xorm/schemas"
 )
 
 // Interface defines the interface which Engine, EngineGroup and Session will implementate.
@@ -74,61 +64,4 @@ type Interface interface {
 	Where(interface{}, ...interface{}) *Session
 }
 
-// EngineInterface defines the interface which Engine, EngineGroup will implementate.
-type EngineInterface interface {
-	Interface
-
-	Before(func(interface{})) *Session
-	Charset(charset string) *Session
-	ClearCache(...interface{}) error
-	Context(context.Context) *Session
-	CreateTables(...interface{}) error
-	DBMetas() ([]*schemas.Table, error)
-	DBVersion() (*schemas.Version, error)
-	Dialect() dialects.Dialect
-	DriverName() string
-	DropTables(...interface{}) error
-	DumpAllToFile(fp string, tp ...schemas.DBType) error
-	GetCacher(string) caches.Cacher
-	GetColumnMapper() names.Mapper
-	GetDefaultCacher() caches.Cacher
-	GetTableMapper() names.Mapper
-	GetTZDatabase() *time.Location
-	GetTZLocation() *time.Location
-	ImportFile(fp string) ([]sql.Result, error)
-	MapCacher(interface{}, caches.Cacher) error
-	NewSession() *Session
-	NoAutoTime() *Session
-	Prepare() *Session
-	Quote(string) string
-	SetCacher(string, caches.Cacher)
-	SetConnMaxLifetime(time.Duration)
-	SetColumnMapper(names.Mapper)
-	SetTagIdentifier(string)
-	SetDefaultCacher(caches.Cacher)
-	SetLogger(logger interface{})
-	SetLogLevel(log.LogLevel)
-	SetMapper(names.Mapper)
-	SetMaxOpenConns(int)
-	SetMaxIdleConns(int)
-	SetQuotePolicy(dialects.QuotePolicy)
-	SetSchema(string)
-	SetTableMapper(names.Mapper)
-	SetTZDatabase(tz *time.Location)
-	SetTZLocation(tz *time.Location)
-	AddHook(hook contexts.Hook)
-	ShowSQL(show ...bool)
-	Sync(...interface{}) error
-	Sync2(...interface{}) error
-	StoreEngine(storeEngine string) *Session
-	TableInfo(bean interface{}) (*schemas.Table, error)
-	TableName(interface{}, ...bool) string
-	UnMapType(reflect.Type)
-	EnableSessionID(bool)
-}
-
-var (
-	_ Interface       = &Session{}
-	_ EngineInterface = &Engine{}
-	_ EngineInterface = &EngineGroup{}
-)
+var _ Interface = &Session{}