From bd24ca03bcef8426d219de8231a4a5c3f94372f4 Mon Sep 17 00:00:00 2001
From: Alexey Dudko <dududko@gmail.com>
Date: Thu, 10 Sep 2020 12:30:45 +0300
Subject: [PATCH] added a fix that closes a connection with a transactionthat
 was failed to resume by server (#606)

---
 mssql.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/mssql.go b/mssql.go
index 25c268ed..773ed870 100644
--- a/mssql.go
+++ b/mssql.go
@@ -184,13 +184,20 @@ func (c *Conn) checkBadConn(err error) error {
 		panic("driver.ErrBadConn in checkBadConn. This should not happen.")
 	}
 
-	switch err.(type) {
+	switch typedErr := err.(type) {
 	case net.Error:
 		c.connectionGood = false
 		return err
 	case StreamError:
 		c.connectionGood = false
 		return err
+	case Error:
+		// The server failed to resume the transaction
+		// Issue https://github.com/denisenkom/go-mssqldb/issues/606
+		if typedErr.Number == 3971 && typedErr.Class == 16 {
+			c.connectionGood = false
+		}
+		return err
 	default:
 		return err
 	}