From 934e845e5996d0b9dabc8a59f7e5c16358361f93 Mon Sep 17 00:00:00 2001
From: ymmt2005 <ymmt2005@gmail.com>
Date: Tue, 10 Nov 2015 08:59:32 +0900
Subject: [PATCH] Add _binary prefix when interpolating []byte data.

Since 5.6.27, mysql server produces a warning if string literals cannot
be interpreted in a given character set (see Bug #20238729).
As a consequence, the driver may fail to insert []byte data into
BLOB columns when interpolateParams is true.

This commit adds "_binary" encoding prefix when interpolating []byte data
to avoid that warning.

http://dev.mysql.com/doc/refman/5.7/en/charset-literal.html
---
 AUTHORS       | 1 +
 connection.go | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/AUTHORS b/AUTHORS
index 6fc4c6f7b..d4b321788 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -20,6 +20,7 @@ Frederick Mayle <frederickmayle at gmail.com>
 Gustavo Kristic <gkristic at gmail.com>
 Hanno Braun <mail at hannobraun.com>
 Henri Yandell <flamefew at gmail.com>
+Hirotaka Yamamoto <ymmt2005 at gmail.com>
 INADA Naoki <songofacandy at gmail.com>
 James Harr <james.harr at gmail.com>
 Jian Zhen <zhenjl at gmail.com>
diff --git a/connection.go b/connection.go
index caaae013f..72ed09d69 100644
--- a/connection.go
+++ b/connection.go
@@ -253,7 +253,7 @@ func (mc *mysqlConn) interpolateParams(query string, args []driver.Value) (strin
 			if v == nil {
 				buf = append(buf, "NULL"...)
 			} else {
-				buf = append(buf, '\'')
+				buf = append(buf, "_binary'"...)
 				if mc.status&statusNoBackslashEscapes == 0 {
 					buf = escapeBytesBackslash(buf, v)
 				} else {