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authorBoris Kolpackov <boris@codesynthesis.com>2011-08-30 16:10:02 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2011-08-30 16:10:02 +0200
commit1c1544f5297f88bbbcbbad2d21c4ec7b62bb9a28 (patch)
tree10db5dc702376bdc14777e1e7d2afbab0ce8dc10 /odb/sqlite/auto-handle.hxx
parent8568cd25d943636e33ec00a935ad8a67d4876e14 (diff)
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.
Diffstat (limited to 'odb/sqlite/auto-handle.hxx')
-rw-r--r--odb/sqlite/auto-handle.hxx103
1 files changed, 103 insertions, 0 deletions
diff --git a/odb/sqlite/auto-handle.hxx b/odb/sqlite/auto-handle.hxx
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+// 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