From a23913685e9f5937956e556b5c3debbb04216ccf Mon Sep 17 00:00:00 2001
From: peihexian <peihexian@qq.com>
Date: Wed, 8 May 2019 11:26:36 +0800
Subject: [PATCH] =?UTF-8?q?=E8=A7=A3=E5=86=B3Conversion=E6=8E=A5=E5=8F=A3T?=
 =?UTF-8?q?oDB()=20([]byte,=20error)=E6=96=B9=E6=B3=95=E8=BF=94=E5=9B=9E*T?=
 =?UTF-8?q?ype=E5=80=BC=E4=B8=BAnil=E6=97=B6,=E6=95=B0=E6=8D=AE=E7=B1=BB?=
 =?UTF-8?q?=E5=9E=8B=E4=B8=BA[]byte(nil)=E7=9A=84bug,=E8=A7=A3=E5=86=B3*Ty?=
 =?UTF-8?q?pe=E5=80=BC=E4=B8=BAnil=E6=97=B6=E6=8F=92=E5=85=A5=E6=95=B0?=
 =?UTF-8?q?=E6=8D=AE=E5=8F=98=E4=B8=BA""=E7=9A=84bug?=
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---
 session_convert.go | 3 +++
 statement.go       | 6 +++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/session_convert.go b/session_convert.go
index 6b6fbdeaf..1ff003cdf 100644
--- a/session_convert.go
+++ b/session_convert.go
@@ -554,6 +554,9 @@ func (session *Session) value2Interface(col *core.Column, fieldValue reflect.Val
 		if col.SQLType.IsBlob() {
 			return data, nil
 		}
+		if nil==data {
+			return nil,nil
+		}		
 		return string(data), nil
 	}
 
diff --git a/statement.go b/statement.go
index ddff4493b..8216a012c 100644
--- a/statement.go
+++ b/statement.go
@@ -319,7 +319,11 @@ func (statement *Statement) buildUpdates(bean interface{},
 			if err != nil {
 				engine.logger.Error(err)
 			} else {
-				val = data
+				if nil==data {
+					val=nil
+				}else{
+					val = data
+				}
 			}
 			goto APPEND
 		}