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// file : odb/mysql/statement.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_HXX
#define ODB_MYSQL_STATEMENT_HXX
#include <mysql/mysql.h>
#include <map>
#include <string>
#include <typeinfo>
#include <odb/forward.hxx>
#include <odb/traits.hxx>
#include <odb/shared-ptr.hxx>
namespace odb
{
namespace mysql
{
class connection;
class statement: public shared_base
{
public:
virtual
~statement () = 0;
protected:
statement (connection&);
protected:
connection& conn_;
MYSQL_STMT* stmt_;
};
template <typename T>
class insert_statement: public statement
{
public:
typedef T object_type;
typedef odb::object_traits<T> object_traits;
typedef typename object_traits::image_type image_type;
public:
virtual
~insert_statement ();
insert_statement (connection& conn,
const std::string& query,
image_type&);
image_type&
image ()
{
return image_;
}
void
execute ();
private:
insert_statement (const insert_statement&);
insert_statement& operator= (const insert_statement&);
private:
image_type& image_;
MYSQL_BIND bind_[object_traits::column_count];
};
// Statement cache.
//
class object_statements_base: public shared_base
{
public:
virtual
~object_statements_base ();
protected:
object_statements_base (connection& conn)
: conn_ (conn)
{
}
protected:
connection& conn_;
};
template <typename T>
class object_statements: public object_statements_base
{
public:
typedef typename object_traits<T>::image_type image_type;
object_statements (connection& conn)
: object_statements_base (conn)
{
}
insert_statement<T>&
insert ()
{
if (insert_ == 0)
insert_.reset (
new (shared) insert_statement<T> (
conn_, object_traits<T>::insert_query, image_));
return *insert_;
}
private:
image_type image_;
odb::shared_ptr<insert_statement<T> > insert_;
};
struct 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 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);
shared_ptr<object_statements<T> > p (
new (shared) object_statements<T> (conn_));
map_.insert (map::value_type (&typeid (T), p));
return *p;
}
private:
typedef std::map<const std::type_info*,
shared_ptr<object_statements_base>,
type_info_comparator> map;
connection& conn_;
map map_;
};
}
}
#include <odb/mysql/statement.txx>
#endif // ODB_MYSQL_STATEMENT_HXX
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