From b1a6710e7d396538617550f1d00b4db2575485c7 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 22 Mar 2011 15:48:14 +0200
Subject: Implement built-in value traits for SQLite

---
 odb/sqlite/traits.hxx | 230 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 230 insertions(+)
 create mode 100644 odb/sqlite/traits.hxx

(limited to 'odb/sqlite/traits.hxx')

diff --git a/odb/sqlite/traits.hxx b/odb/sqlite/traits.hxx
new file mode 100644
index 0000000..e5ef318
--- /dev/null
+++ b/odb/sqlite/traits.hxx
@@ -0,0 +1,230 @@
+// file      : odb/sqlite/traits.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_SQLITE_TRAITS_HXX
+#define ODB_SQLITE_TRAITS_HXX
+
+#include <odb/pre.hxx>
+
+#include <string>
+#include <cstddef> // std::size_t
+
+#include <odb/traits.hxx>
+#include <odb/details/buffer.hxx>
+
+#include <odb/sqlite/version.hxx>
+#include <odb/sqlite/details/export.hxx>
+
+namespace odb
+{
+  namespace sqlite
+  {
+    enum database_type_id
+    {
+      id_integer,
+      id_real,
+      id_text,
+      id_blob
+    };
+
+    //
+    // value_traits
+    //
+
+    template <typename T, typename I, database_type_id>
+    struct default_value_traits;
+
+    template <typename T, typename I, database_type_id ID>
+    class value_traits: public default_value_traits<T, I, ID>
+    {
+    };
+
+    template <typename T, typename I, database_type_id>
+    struct default_value_traits
+    {
+      typedef T value_type;
+      typedef T query_type;
+      typedef I image_type;
+
+      static void
+      set_value (T& v, I i, bool is_null)
+      {
+        if (!is_null)
+          v = T (i);
+        else
+          v = T ();
+      }
+
+      static void
+      set_image (I& i, bool& is_null, T v)
+      {
+        is_null = false;
+        i = I (v);
+      }
+    };
+
+    // std::string specialization.
+    //
+    template <>
+    struct LIBODB_SQLITE_EXPORT default_value_traits<
+      std::string, details::buffer, id_text>
+    {
+      typedef std::string value_type;
+      typedef std::string query_type;
+      typedef details::buffer image_type;
+
+      static void
+      set_value (std::string& v,
+                 const details::buffer& b,
+                 std::size_t n,
+                 bool is_null)
+      {
+        if (!is_null)
+          v.assign (b.data (), n);
+        else
+          v.erase ();
+      }
+
+      static void
+      set_image (details::buffer&,
+                 std::size_t& n,
+                 bool& is_null,
+                 const std::string&);
+    };
+
+    // const char* specialization
+    //
+    // Specialization for const char* which only supports initialization
+    // of an image from the value but not the other way around. This way
+    // we can pass such values to the queries.
+    //
+    template <>
+    struct LIBODB_SQLITE_EXPORT default_value_traits<
+      const char*, details::buffer, id_text>
+    {
+      typedef const char* value_type;
+      typedef const char* query_type;
+      typedef details::buffer image_type;
+
+      static void
+      set_image (details::buffer&,
+                 std::size_t& n,
+                 bool& is_null,
+                 const char*);
+    };
+
+    //
+    // type_traits
+    //
+
+    template <typename T>
+    struct default_type_traits;
+
+    template <typename T>
+    class type_traits: public default_type_traits<T>
+    {
+    };
+
+    // Integral types.
+    //
+    template <>
+    struct default_type_traits<bool>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    template <>
+    struct default_type_traits<signed char>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    template <>
+    struct default_type_traits<unsigned char>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    template <>
+    struct default_type_traits<short>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    template <>
+    struct default_type_traits<unsigned short>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    template <>
+    struct default_type_traits<int>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    template <>
+    struct default_type_traits<unsigned int>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    template <>
+    struct default_type_traits<long>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    template <>
+    struct default_type_traits<unsigned long>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    template <>
+    struct default_type_traits<long long>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    template <>
+    struct default_type_traits<unsigned long long>
+    {
+      static const database_type_id db_type_id = id_integer;
+    };
+
+    // Float types.
+    //
+    template <>
+    struct default_type_traits<float>
+    {
+      static const database_type_id db_type_id = id_real;
+    };
+
+    template <>
+    struct default_type_traits<double>
+    {
+      static const database_type_id db_type_id = id_real;
+    };
+
+    // String type.
+    //
+    template <>
+    struct default_type_traits<std::string>
+    {
+      static const database_type_id db_type_id = id_text;
+    };
+
+    template <>
+    struct default_type_traits<const char*>
+    {
+      static const database_type_id db_type_id = id_text;
+    };
+  }
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_SQLITE_TRAITS_HXX
-- 
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