From 553c15ed6f03547de7c69345944eb9fb333d0030 Mon Sep 17 00:00:00 2001
From: Inada Naoki <songofacandy@gmail.com>
Date: Thu, 14 Nov 2019 17:42:46 +0900
Subject: [PATCH] Return ErrBadConn in Prepare

---
 connection.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/connection.go b/connection.go
index 565a5480a..e4bb59e67 100644
--- a/connection.go
+++ b/connection.go
@@ -154,7 +154,9 @@ func (mc *mysqlConn) Prepare(query string) (driver.Stmt, error) {
 	// Send command
 	err := mc.writeCommandPacketStr(comStmtPrepare, query)
 	if err != nil {
-		return nil, mc.markBadConn(err)
+		// STMT_PREPARE is safe to retry.  So we can return ErrBadConn here.
+		errLog.Print(err)
+		return nil, driver.ErrBadConn
 	}
 
 	stmt := &mysqlStmt{