diff --git a/dialect_sqlite3.go b/dialect_sqlite3.go
index c13fd02b..c32524f4 100644
--- a/dialect_sqlite3.go
+++ b/dialect_sqlite3.go
@@ -14,10 +14,6 @@ import (
 	"github.com/go-xorm/core"
 )
 
-// func init() {
-// 	RegisterDialect("sqlite3", &sqlite3{})
-// }
-
 var (
 	sqlite3ReservedWords = map[string]bool{
 		"ABORT":             true,
diff --git a/engine.go b/engine.go
index b2b2f97b..5cc8da95 100644
--- a/engine.go
+++ b/engine.go
@@ -195,6 +195,11 @@ func (engine *Engine) SetMaxIdleConns(conns int) {
 	engine.db.SetMaxIdleConns(conns)
 }
 
+// SetConnMaxLifetime sets the maximum amount of time a connection may be reused.
+func (engine *Engine) SetConnMaxLifetime(d time.Duration) {
+	engine.db.SetConnMaxLifetime(d)
+}
+
 // SetDefaultCacher set the default cacher. Xorm's default not enable cacher.
 func (engine *Engine) SetDefaultCacher(cacher core.Cacher) {
 	engine.Cacher = cacher
diff --git a/session_pk_test.go b/session_pk_test.go
index b9c70321..3030fca4 100644
--- a/session_pk_test.go
+++ b/session_pk_test.go
@@ -7,6 +7,7 @@ package xorm
 import (
 	"errors"
 	"testing"
+	"time"
 
 	"github.com/go-xorm/core"
 	"github.com/stretchr/testify/assert"
@@ -1117,3 +1118,17 @@ func TestSingleAutoIncrColumn(t *testing.T) {
 	_, err := testEngine.Insert(&Account{})
 	assert.NoError(t, err)
 }
+
+func TestCompositePK(t *testing.T) {
+	type TaskSolution struct {
+		UID     string    `xorm:"notnull pk UUID 'uid'"`
+		TID     string    `xorm:"notnull pk UUID 'tid'"`
+		Created time.Time `xorm:"created"`
+		Updated time.Time `xorm:"updated"`
+	}
+
+	assert.NoError(t, prepareEngine())
+	assertSync(t, new(TaskSolution))
+
+	assert.NoError(t, testEngine.Sync2(new(TaskSolution)))
+}