From 847c4a22c80f9bd8ea544e23309d3575ed1be904 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 4 Jul 2019 16:32:10 +0200
Subject: Fix bug in long data query parameter handling

---
 odb/mssql/query.cxx | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/odb/mssql/query.cxx b/odb/mssql/query.cxx
index 08c5a90..2f3a5c1 100644
--- a/odb/mssql/query.cxx
+++ b/odb/mssql/query.cxx
@@ -389,9 +389,17 @@ namespace odb
           size_ += n;
         }
 
-        if (chunk == chunk_one ||
-            chunk == chunk_last ||
-            chunk == chunk_null)
+        if (chunk == chunk_one || chunk == chunk_last)
+        {
+          // Make sure the resulting buffer is not NULL (failed that, this
+          // parameter will be skipped by the query machinery).
+          //
+          if (size_ == 0)
+            buf_.capacity (1);
+
+          break;
+        }
+        else if (chunk == chunk_null)
           break;
       }
     }
-- 
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