From 39aa071b15abedba83a4ea4d4075eef2fc8cba8f Mon Sep 17 00:00:00 2001
From: Jack Christensen <jack@jackchristensen.com>
Date: Thu, 26 Aug 2021 13:21:02 -0500
Subject: [PATCH] Add zeronull float8

---
 zeronull/float8.go      | 90 +++++++++++++++++++++++++++++++++++++++++
 zeronull/float8_test.go | 23 +++++++++++
 2 files changed, 113 insertions(+)
 create mode 100644 zeronull/float8.go
 create mode 100644 zeronull/float8_test.go

diff --git a/zeronull/float8.go b/zeronull/float8.go
new file mode 100644
index 00000000..effd0a11
--- /dev/null
+++ b/zeronull/float8.go
@@ -0,0 +1,90 @@
+package zeronull
+
+import (
+	"database/sql/driver"
+
+	"github.com/jackc/pgtype"
+)
+
+type Float8 int64
+
+func (dst *Float8) DecodeText(ci *pgtype.ConnInfo, src []byte) error {
+	var nullable pgtype.Float8
+	err := nullable.DecodeText(ci, src)
+	if err != nil {
+		return err
+	}
+
+	if nullable.Status == pgtype.Present {
+		*dst = Float8(nullable.Float)
+	} else {
+		*dst = 0
+	}
+
+	return nil
+}
+
+func (dst *Float8) DecodeBinary(ci *pgtype.ConnInfo, src []byte) error {
+	var nullable pgtype.Float8
+	err := nullable.DecodeBinary(ci, src)
+	if err != nil {
+		return err
+	}
+
+	if nullable.Status == pgtype.Present {
+		*dst = Float8(nullable.Float)
+	} else {
+		*dst = 0
+	}
+
+	return nil
+}
+
+func (src Float8) EncodeText(ci *pgtype.ConnInfo, buf []byte) ([]byte, error) {
+	if src == 0 {
+		return nil, nil
+	}
+
+	nullable := pgtype.Float8{
+		Float:  float64(src),
+		Status: pgtype.Present,
+	}
+
+	return nullable.EncodeText(ci, buf)
+}
+
+func (src Float8) EncodeBinary(ci *pgtype.ConnInfo, buf []byte) ([]byte, error) {
+	if src == 0 {
+		return nil, nil
+	}
+
+	nullable := pgtype.Float8{
+		Float:  float64(src),
+		Status: pgtype.Present,
+	}
+
+	return nullable.EncodeBinary(ci, buf)
+}
+
+// Scan implements the database/sql Scanner interface.
+func (dst *Float8) Scan(src interface{}) error {
+	if src == nil {
+		*dst = 0
+		return nil
+	}
+
+	var nullable pgtype.Float8
+	err := nullable.Scan(src)
+	if err != nil {
+		return err
+	}
+
+	*dst = Float8(nullable.Float)
+
+	return nil
+}
+
+// Value implements the database/sql/driver Valuer interface.
+func (src Float8) Value() (driver.Value, error) {
+	return pgtype.EncodeValueText(src)
+}
diff --git a/zeronull/float8_test.go b/zeronull/float8_test.go
new file mode 100644
index 00000000..27fb785e
--- /dev/null
+++ b/zeronull/float8_test.go
@@ -0,0 +1,23 @@
+package zeronull_test
+
+import (
+	"testing"
+
+	"github.com/jackc/pgtype/testutil"
+	"github.com/jackc/pgtype/zeronull"
+)
+
+func TestFloat8Transcode(t *testing.T) {
+	testutil.TestSuccessfulTranscode(t, "float8", []interface{}{
+		(zeronull.Float8)(1),
+		(zeronull.Float8)(0),
+	})
+}
+
+func TestFloat8ConvertsGoZeroToNull(t *testing.T) {
+	testutil.TestGoZeroToNullConversion(t, "float8", (zeronull.Float8)(0))
+}
+
+func TestFloat8ConvertsNullToGoZero(t *testing.T) {
+	testutil.TestNullToGoZeroConversion(t, "float8", (zeronull.Float8)(0))
+}