From 3189b41ec3dc91e263199ddca7a6f0e63da90f5d Mon Sep 17 00:00:00 2001
From: haolei <haolei2008@gmail.com>
Date: Mon, 20 Jul 2015 14:13:13 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=AD=A3=E6=94=AF=E6=8C=81sql.NullStr?=
 =?UTF-8?q?ing=E5=AD=97=E6=AE=B5=E6=97=B6=EF=BC=8C=E4=BD=BF=E7=94=A8Iterat?=
 =?UTF-8?q?er=E6=96=B9=E6=B3=95=E6=97=B6=E5=B4=A9=E6=BA=83?=
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---
 statement.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/statement.go b/statement.go
index d5f6d072..56c0471f 100644
--- a/statement.go
+++ b/statement.go
@@ -321,6 +321,10 @@ func buildUpdates(engine *Engine, table *core.Table, bean interface{},
 					continue
 				}
 				val = engine.FormatTime(col.SQLType.Name, t)
+			} else if nulVal, ok := fieldValue.Interface().(driver.Valuer); ok {
+				if val, _ = nulVal.Value(); val == nil {
+					continue
+				}
 			} else {
 				engine.autoMapType(fieldValue)
 				if table, ok := engine.Tables[fieldValue.Type()]; ok {