From 68f64ea9543f44b71f580f165bff52286e005c79 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 3 Nov 2011 08:16:50 +0200
Subject: Add support for mapping std::vector<unsigned char> to BLOB types

---
 odb/mysql/traits.cxx | 22 ++++++++++++++++++++++
 odb/mysql/traits.hxx | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/odb/mysql/traits.cxx b/odb/mysql/traits.cxx
index 7b901c5..0727861 100644
--- a/odb/mysql/traits.cxx
+++ b/odb/mysql/traits.cxx
@@ -76,5 +76,27 @@ namespace odb
       if (n != 0)
         memcpy (b.data (), &v.front (), n);
     }
+
+    //
+    // default_value_traits<vector<unsigned char>, id_blob>
+    //
+
+    void default_value_traits<vector<unsigned char>, id_blob>::
+    set_image (details::buffer& b,
+               size_t& n,
+               bool& is_null,
+               const value_type& v)
+    {
+      is_null = false;
+      n = v.size ();
+
+      if (n > b.capacity ())
+        b.capacity (n);
+
+      // std::vector::data() may not be available in older compilers.
+      //
+      if (n != 0)
+        memcpy (b.data (), &v.front (), n);
+    }
   }
 }
diff --git a/odb/mysql/traits.hxx b/odb/mysql/traits.hxx
index c508624..7994d59 100644
--- a/odb/mysql/traits.hxx
+++ b/odb/mysql/traits.hxx
@@ -519,6 +519,40 @@ namespace odb
                  const value_type&);
     };
 
+    // std::vector<unsigned char> (buffer) specialization.
+    //
+    template <>
+    struct LIBODB_MYSQL_EXPORT default_value_traits<
+      std::vector<unsigned char>, id_blob>
+    {
+    public:
+      typedef std::vector<unsigned char> value_type;
+      typedef std::vector<unsigned char> query_type;
+      typedef details::buffer image_type;
+
+      static void
+      set_value (value_type& v,
+                 const details::buffer& b,
+                 std::size_t n,
+                 bool is_null)
+      {
+        if (!is_null)
+        {
+          const unsigned char* d (
+            reinterpret_cast<const unsigned char*> (b.data ()));
+          v.assign (d, d + n);
+        }
+        else
+          v.clear ();
+      }
+
+      static void
+      set_image (details::buffer&,
+                 std::size_t& n,
+                 bool& is_null,
+                 const value_type&);
+    };
+
     //
     // type_traits
     //
-- 
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