diff --git a/backends.go b/backends.go
index 16253f3..4b0eafa 100644
--- a/backends.go
+++ b/backends.go
@@ -123,6 +123,8 @@ type IBackend interface {
 	DATE_FORMAT(name string, field IQueryField, format string) IQueryField
 	// INET_ATON
 	INET_ATON(field IQueryField) IQueryField
+	// INET6_ATON
+	INET6_ATON(field IQueryField) IQueryField
 	// AND_Val
 	AND_Val(name string, field IQueryField, v interface{}) IQueryField
 	// OR_Val
diff --git a/backends/dameng/functions.go b/backends/dameng/functions.go
index ed534cc..46d161b 100644
--- a/backends/dameng/functions.go
+++ b/backends/dameng/functions.go
@@ -31,7 +31,7 @@ func (dameng *SDamengBackend) GROUP_CONCAT2(name string, sep string, field sqlch
 
 // INET_ATON represents the SQL function INET_ATON
 func (dameng *SDamengBackend) INET_ATON(field sqlchemy.IQueryField) sqlchemy.IQueryField {
-	expr := ""
+	/*expr := ""
 	vars := make([]sqlchemy.IQueryField, 0)
 	expr += `TO_NUMBER(SUBSTR(%s,1,INSTR(%s,'.')-1))*POWER(256,3)+`
 	vars = append(vars, field, field)
@@ -41,7 +41,8 @@ func (dameng *SDamengBackend) INET_ATON(field sqlchemy.IQueryField) sqlchemy.IQu
 	vars = append(vars, field, field, field, field)
 	expr += `TO_NUMBER(SUBSTR(%s,INSTR(%s,'.',1,3)+1))`
 	vars = append(vars, field, field)
-	return sqlchemy.NewFunctionField("", false, expr, vars...)
+	return sqlchemy.NewFunctionField("", false, expr, vars...)*/
+	return sqlchemy.NewFunctionField("", false, `HEX(SF_INET_SORT(%s))`, field)
 }
 
 // cast field to string
@@ -58,3 +59,8 @@ func (dameng *SDamengBackend) CASTInt(field sqlchemy.IQueryField, fieldname stri
 func (dameng *SDamengBackend) CASTFloat(field sqlchemy.IQueryField, fieldname string) sqlchemy.IQueryField {
 	return sqlchemy.NewFunctionField(fieldname, false, `CAST(%s AS REAL)`, field)
 }
+
+// INET6_ATON represents a SQL function INET6_ATON
+func (dameng *SDamengBackend) INET6_ATON(field sqlchemy.IQueryField) sqlchemy.IQueryField {
+	return sqlchemy.NewFunctionField("", false, `HEX(SF_INET_SORT(%s))`, field)
+}
diff --git a/backends/dameng/query_test.go b/backends/dameng/query_test.go
index 96a0bab..8462df5 100644
--- a/backends/dameng/query_test.go
+++ b/backends/dameng/query_test.go
@@ -103,14 +103,21 @@ func TestQuery(t *testing.T) {
 	t.Run("query INET_ATON func", func(t *testing.T) {
 		testReset()
 		q := testTable.Query(testTable.Field("col1"), sqlchemy.INET_ATON(testTable.Field("col0")).Label("ipaddr"))
-		want := `SELECT "t1"."col1" AS "col1", TO_NUMBER(SUBSTR("t1"."col0",1,INSTR("t1"."col0",'.')-1))*POWER(256,3)+TO_NUMBER(SUBSTR("t1"."col0",INSTR("t1"."col0",'.')+1,INSTR("t1"."col0",'.',1,2)-INSTR("t1"."col0",'.')-1))*POWER(256,2)+TO_NUMBER(SUBSTR("t1"."col0",INSTR("t1"."col0",'.',1,2)+1,INSTR("t1"."col0",'.',1,3)-INSTR("t1"."col0",'.',1,2)-1))*256+TO_NUMBER(SUBSTR("t1"."col0",INSTR("t1"."col0",'.',1,3)+1)) AS "ipaddr" FROM "test" AS "t1"`
+		want := `SELECT "t1"."col1" AS "col1", HEX(SF_INET_SORT("t1"."col0")) AS "ipaddr" FROM "test" AS "t1"`
 		testGotWant(t, q.String(), want)
 	})
 
 	t.Run("query INET_ATON func by group", func(t *testing.T) {
 		testReset()
 		q := testTable.Query(testTable.Field("col1").Label("number"), sqlchemy.INET_ATON(testTable.Field("col0")).Label("ipaddr"), sqlchemy.NewConstField(123456).Label("gateway")).GroupBy(testTable.Field("col0"))
-		want := `SELECT MAX("t1"."col1") AS "number", MAX(TO_NUMBER(SUBSTR("t1"."col0",1,INSTR("t1"."col0",'.')-1))*POWER(256,3)+TO_NUMBER(SUBSTR("t1"."col0",INSTR("t1"."col0",'.')+1,INSTR("t1"."col0",'.',1,2)-INSTR("t1"."col0",'.')-1))*POWER(256,2)+TO_NUMBER(SUBSTR("t1"."col0",INSTR("t1"."col0",'.',1,2)+1,INSTR("t1"."col0",'.',1,3)-INSTR("t1"."col0",'.',1,2)-1))*256+TO_NUMBER(SUBSTR("t1"."col0",INSTR("t1"."col0",'.',1,3)+1))) AS "ipaddr", 123456 AS "gateway" FROM "test" AS "t1" GROUP BY "t1"."col0"`
+		want := `SELECT MAX("t1"."col1") AS "number", MAX(HEX(SF_INET_SORT("t1"."col0"))) AS "ipaddr", 123456 AS "gateway" FROM "test" AS "t1" GROUP BY "t1"."col0"`
+		testGotWant(t, q.String(), want)
+	})
+
+	t.Run("query INET6_ATON func", func(t *testing.T) {
+		testReset()
+		q := testTable.Query(testTable.Field("col1"), sqlchemy.INET6_ATON(testTable.Field("col0")).Label("ipaddr"))
+		want := `SELECT "t1"."col1" AS "col1", HEX(SF_INET_SORT("t1"."col0")) AS "ipaddr" FROM "test" AS "t1"`
 		testGotWant(t, q.String(), want)
 	})
 }
diff --git a/backends_base.go b/backends_base.go
index 3855e21..92f95e3 100644
--- a/backends_base.go
+++ b/backends_base.go
@@ -154,6 +154,11 @@ func (bb *SBaseBackend) INET_ATON(field IQueryField) IQueryField {
 	return NewFunctionField("", false, `INET_ATON(%s)`, field)
 }
 
+// INET6_ATON represents a SQL function INET6_ATON
+func (bb *SBaseBackend) INET6_ATON(field IQueryField) IQueryField {
+	return NewFunctionField("", false, `INET6_ATON(%s)`, field)
+}
+
 // SubStr represents a SQL function SUBSTR
 func (bb *SBaseBackend) SUBSTR(name string, field IQueryField, pos, length int) IQueryField {
 	var rightStr string
diff --git a/functions.go b/functions.go
index 9542b67..4bd8ca7 100644
--- a/functions.go
+++ b/functions.go
@@ -228,6 +228,8 @@ func REPLACE(name string, field IQueryField, old string, new string) IQueryField
 type SConstField struct {
 	constVar interface{}
 	alias    string
+
+	db *SDatabase
 }
 
 // Expression implementation of SConstField for IQueryField
@@ -260,7 +262,7 @@ func (s *SConstField) ConvertFromValue(val interface{}) interface{} {
 
 // database implementation of SConstField for IQueryField
 func (s *SConstField) database() *SDatabase {
-	return nil
+	return s.db
 }
 
 // Variables implementation of SConstField for IQueryField
@@ -278,10 +280,24 @@ func NewConstField(variable interface{}) *SConstField {
 	return &SConstField{constVar: variable}
 }
 
+// database implementation of SStringField for IQueryField
+func (s *SConstField) WithField(f IQueryField) *SConstField {
+	s.db = f.database()
+	return s
+}
+
+func (q *SQuery) ConstField(variable interface{}) *SConstField {
+	f := NewConstField(variable)
+	f.db = q.db
+	return f
+}
+
 // SStringField is a query field of a string constant
 type SStringField struct {
 	strConst string
 	alias    string
+
+	db *SDatabase
 }
 
 // Expression implementation of SStringField for IQueryField
@@ -314,7 +330,7 @@ func (s *SStringField) ConvertFromValue(val interface{}) interface{} {
 
 // database implementation of SStringField for IQueryField
 func (s *SStringField) database() *SDatabase {
-	return nil
+	return s.db
 }
 
 // Variables implementation of SStringField for IQueryField
@@ -327,11 +343,23 @@ func (s *SStringField) IsAggregate() bool {
 	return true
 }
 
+// database implementation of SStringField for IQueryField
+func (s *SStringField) WithField(f IQueryField) *SStringField {
+	s.db = f.database()
+	return s
+}
+
 // NewStringField returns an instance of SStringField
 func NewStringField(strConst string) *SStringField {
 	return &SStringField{strConst: strConst}
 }
 
+func (q *SQuery) StringField(strConst string) *SStringField {
+	f := NewStringField(strConst)
+	f.db = q.db
+	return f
+}
+
 // CONCAT represents a SQL function CONCAT
 func CONCAT(name string, fields ...IQueryField) IQueryField {
 	return getFieldBackend(fields...).CONCAT(name, fields...)
@@ -363,6 +391,11 @@ func INET_ATON(field IQueryField) IQueryField {
 	return getFieldBackend(field).INET_ATON(field)
 }
 
+// INET6_ATON represents a SQL function INET_ATON
+func INET6_ATON(field IQueryField) IQueryField {
+	return getFieldBackend(field).INET6_ATON(field)
+}
+
 // TimestampAdd represents a SQL function TimestampAdd
 func TimestampAdd(name string, field IQueryField, offsetSeconds int) IQueryField {
 	return TIMESTAMPADD(name, field, offsetSeconds)