big: add method that implement sql/driver.Valuer for type Rat

The Rat.Value() return the value as []byte.

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/math/big/rat.go b/lib/math/big/rat.go
index abef7d2c..2c4a66c9 100644
--- a/lib/math/big/rat.go
+++ b/lib/math/big/rat.go
@@ -6,6 +6,7 @@ package big
 
 import (
 	"bytes"
+	"database/sql/driver"
 	"fmt"
 	"log"
 	"math/big"
@@ -451,6 +452,20 @@ func (r *Rat) UnmarshalJSON(in []byte) (err error) {
 }
 
 //
+// Value return the []byte value for database/sql, as defined in
+// sql/driver.Valuer.
+//
+func (r *Rat) Value() (driver.Value, error) {
+	var s string
+	if r == nil {
+		s = "0"
+	} else {
+		s = r.String()
+	}
+	return []byte(s), nil
+}
+
+//
 // toRat convert any type to Rat or nil if type is unknown.
 // If in is not nil, it will be set to out.
 //