Add support for container persistence

Generalize statements that were used for persisting objects to work for
both objects and containers. Implement a cache for container statements.

1 files changed, 83 insertions, 0 deletions

diff --git a/odb/mysql/statement-cache.hxx b/odb/mysql/statement-cache.hxx
new file mode 100644
index 0000000..480f30d
--- /dev/null
+++ b/odb/mysql/statement-cache.hxx
@@ -0,0 +1,83 @@
+// file      : odb/mysql/statement-cache.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_STATEMENT_CACHE_HXX
+#define ODB_MYSQL_STATEMENT_CACHE_HXX
+
+#include <odb/pre.hxx>
+
+#include <map>
+#include <typeinfo>
+
+#include <odb/forward.hxx>
+
+#include <odb/mysql/version.hxx>
+#include <odb/mysql/object-statements.hxx>
+
+#include <odb/details/shared-ptr.hxx>
+
+#include <odb/mysql/details/export.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    class connection;
+
+    struct LIBODB_MYSQL_EXPORT type_info_comparator
+    {
+      bool
+      operator() (const std::type_info* x, const std::type_info* y) const
+      {
+        // XL C++ on AIX has buggy type_info::before() in that
+        // it returns true for two different type_info objects
+        // that happened to be for the same type.
+        //
+#if defined(__xlC__) && defined(_AIX)
+        return *x != *y && x->before (*y);
+#else
+        return x->before (*y);
+#endif
+      }
+    };
+
+    class LIBODB_MYSQL_EXPORT statement_cache
+    {
+    public:
+      statement_cache (connection& conn)
+          : conn_ (conn)
+      {
+      }
+
+      template <typename T>
+      object_statements<T>&
+      find ()
+      {
+        map::iterator i (map_.find (&typeid (T)));
+
+        if (i != map_.end ())
+          return static_cast<object_statements<T>&> (*i->second);
+
+        details::shared_ptr<object_statements<T> > p (
+          new (details::shared) object_statements<T> (conn_));
+
+        map_.insert (map::value_type (&typeid (T), p));
+        return *p;
+      }
+
+    private:
+      typedef std::map<const std::type_info*,
+                       details::shared_ptr<object_statements_base>,
+                       type_info_comparator> map;
+
+      connection& conn_;
+      map map_;
+    };
+  }
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_MYSQL_STATEMENT_CACHE_HXX