make the NullTime type an alias of sql.NullTime

nulltime_go113.go

@@ -28,4 +28,4 @@ import (
 //  }
 //
 // This NullTime implementation is not driver-specific
-type NullTime sql.NullTime
+type NullTime = sql.NullTime

nulltime_legacy.go

@@ -11,6 +11,8 @@
 package mysql
 
 import (
+	"database/sql/driver"
+	"fmt"
 	"time"
 )
 
@@ -32,3 +34,38 @@ type NullTime struct {
 	Time  time.Time
 	Valid bool // Valid is true if Time is not NULL
 }
+
+// Scan implements the Scanner interface.
+// The value type must be time.Time or string / []byte (formatted time-string),
+// otherwise Scan fails.
+func (nt *NullTime) Scan(value interface{}) (err error) {
+	if value == nil {
+		nt.Time, nt.Valid = time.Time{}, false
+		return
+	}
+
+	switch v := value.(type) {
+	case time.Time:
+		nt.Time, nt.Valid = v, true
+		return
+	case []byte:
+		nt.Time, err = parseDateTime(string(v), time.UTC)
+		nt.Valid = (err == nil)
+		return
+	case string:
+		nt.Time, err = parseDateTime(v, time.UTC)
+		nt.Valid = (err == nil)
+		return
+	}
+
+	nt.Valid = false
+	return fmt.Errorf("Can't convert %T to time.Time", value)
+}
+
+// Value implements the driver Valuer interface.
+func (nt NullTime) Value() (driver.Value, error) {
+	if !nt.Valid {
+		return nil, nil
+	}
+	return nt.Time, nil
+}