Add MySQL-specific value traits

1 files changed, 74 insertions, 0 deletions

diff --git a/odb/mysql/traits.hxx b/odb/mysql/traits.hxx
new file mode 100644
index 0000000..18aeac5
--- /dev/null
+++ b/odb/mysql/traits.hxx
@@ -0,0 +1,74 @@
+// file      : odb/mysql/traits.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_MYSQL_TRAITS_HXX
+#define ODB_MYSQL_TRAITS_HXX
+
+#include <string>
+#include <cstddef> // std::size_t
+#include <cstring> // std::memcpy
+
+#include <odb/traits.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    template <typename T>
+    struct value_traits: odb::value_traits<T>
+    {
+    };
+
+    template <>
+    struct value_traits<std::string>
+    {
+      typedef std::string value_type;
+
+      static void
+      set_value (value_type& v, const char* s, std::size_t n, bool is_null)
+      {
+        if (!is_null)
+          v.assign (s, n);
+        else
+          v.erase ();
+      }
+
+      static void
+      set_image (char* s,
+                 std::size_t c,
+                 std::size_t& n,
+                 bool& is_null,
+                 const value_type& v)
+      {
+        is_null = false;
+        n = v.size ();
+
+        if (n > c)
+          n = c;
+
+        if (n != 0)
+          std::memcpy (s, v.c_str (), n);
+      }
+
+      static void
+      set_image (buffer& b,
+                 std::size_t& n,
+                 bool& is_null,
+                 const value_type& v)
+      {
+        is_null = false;
+        n = v.size ();
+
+        if (n > b.capacity ())
+          b.capacity (n);
+
+        if (n != 0)
+          std::memcpy (b.data (), v.c_str (), n);
+      }
+    };
+  }
+}
+
+#endif // ODB_MYSQL_TRAITS_HXX