From 1c1544f5297f88bbbcbbad2d21c4ec7b62bb9a28 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 30 Aug 2011 16:10:02 +0200
Subject: Implement uniform handle management across all databases

Also use the auto_handle template instead of the raw handle in connection,
statement, and result classes. This removes a lot of brittle "exception
safety guarantee" code that we had in those classes.
---
 odb/sqlite/auto-handle.hxx | 103 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 odb/sqlite/auto-handle.hxx

(limited to 'odb/sqlite/auto-handle.hxx')

diff --git a/odb/sqlite/auto-handle.hxx b/odb/sqlite/auto-handle.hxx
new file mode 100644
index 0000000..60b1ea9
--- /dev/null
+++ b/odb/sqlite/auto-handle.hxx
@@ -0,0 +1,103 @@
+// file      : odb/sqlite/auto-handle.hxx
+// author    : Constantin Michael <constantin@codesynthesis.com>
+// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_SQLITE_AUTO_HANDLE_HXX
+#define ODB_SQLITE_AUTO_HANDLE_HXX
+
+#include <odb/pre.hxx>
+
+#include <cassert>
+#include <sqlite3.h>
+
+#include <odb/sqlite/version.hxx>
+
+namespace odb
+{
+  namespace sqlite
+  {
+    template <typename H>
+    struct handle_traits;
+
+    template <>
+    struct handle_traits<sqlite3>
+    {
+      static void
+      release (sqlite3* h)
+      {
+        if (sqlite3_close (h) == SQLITE_BUSY)
+        {
+          // Connection has outstanding prepared statements.
+          //
+          assert (false);
+        }
+      }
+    };
+
+    template <>
+    struct handle_traits<sqlite3_stmt>
+    {
+      static void
+      release (sqlite3_stmt* h)
+      {
+        sqlite3_finalize (h);
+      }
+    };
+
+    template <typename H>
+    class auto_handle
+    {
+    public:
+      auto_handle (H* h = 0)
+          : h_ (h)
+      {
+      }
+
+      ~auto_handle ()
+      {
+        if (h_ != 0)
+          handle_traits<H>::release (h_);
+      }
+
+      H*
+      get () const
+      {
+        return h_;
+      }
+
+      void
+      reset (H* h = 0)
+      {
+        if (h_ != 0)
+          handle_traits<H>::release (h_);
+
+        h_ = h;
+      }
+
+      H*
+      release ()
+      {
+        H* h (h_);
+        h_ = 0;
+        return h;
+      }
+
+      operator H* ()
+      {
+        return h_;
+      }
+
+    private:
+      auto_handle (const auto_handle&);
+      auto_handle& operator= (const auto_handle&);
+
+    private:
+      H* h_;
+    };
+  }
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_SQLITE_AUTO_HANDLE_HXX
-- 
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