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// file : odb/sqlite/connection.hxx
// copyright : Copyright (c) 2005-2019 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_SQLITE_CONNECTION_HXX
#define ODB_SQLITE_CONNECTION_HXX
#include <odb/pre.hxx>
#include <sqlite3.h>
#include <odb/connection.hxx>
#include <odb/details/mutex.hxx>
#include <odb/details/condition.hxx>
#include <odb/details/shared-ptr.hxx>
#include <odb/details/unique-ptr.hxx>
#include <odb/sqlite/version.hxx>
#include <odb/sqlite/forward.hxx>
#include <odb/sqlite/query.hxx>
#include <odb/sqlite/tracer.hxx>
#include <odb/sqlite/transaction-impl.hxx>
#include <odb/sqlite/auto-handle.hxx>
#include <odb/sqlite/details/export.hxx>
namespace odb
{
namespace sqlite
{
class statement_cache;
class connection_factory;
class connection;
typedef details::shared_ptr<connection> connection_ptr;
// SQLite "active object", i.e., an object that needs to be
// "cleared" before the transaction can be committed and the
// connection release. These form a doubly-linked list.
//
class LIBODB_SQLITE_EXPORT active_object
{
public:
// This function should remove the object from the list, since
// it shall no longer be "active".
//
virtual void
clear () = 0;
protected:
active_object (connection& c): prev_ (0), next_ (this), conn_ (c) {}
void
list_add ();
void
list_remove ();
protected:
// prev_ == 0 means we are the first element.
// next_ == 0 means we are the last element.
// next_ == this means we are not on the list (prev_ should be 0).
//
active_object* prev_;
active_object* next_;
connection& conn_;
};
class LIBODB_SQLITE_EXPORT connection: public odb::connection
{
public:
typedef sqlite::statement_cache statement_cache_type;
typedef sqlite::database database_type;
virtual
~connection ();
connection (connection_factory&, int extra_flags = 0);
connection (connection_factory&, sqlite3* handle);
database_type&
database ();
public:
virtual transaction_impl*
begin ();
transaction_impl*
begin_immediate ();
transaction_impl*
begin_exclusive ();
public:
using odb::connection::execute;
virtual unsigned long long
execute (const char* statement, std::size_t length);
// Query preparation.
//
public:
template <typename T>
prepared_query<T>
prepare_query (const char* name, const char*);
template <typename T>
prepared_query<T>
prepare_query (const char* name, const std::string&);
template <typename T>
prepared_query<T>
prepare_query (const char* name, const sqlite::query_base&);
template <typename T>
prepared_query<T>
prepare_query (const char* name, const odb::query_base&);
// SQL statement tracing.
//
public:
typedef sqlite::tracer tracer_type;
void
tracer (tracer_type& t)
{
odb::connection::tracer (t);
}
void
tracer (tracer_type* t)
{
odb::connection::tracer (t);
}
using odb::connection::tracer;
public:
sqlite3*
handle ()
{
return handle_;
}
statement_cache_type&
statement_cache ()
{
return *statement_cache_;
}
// Wait for the locks to be released via unlock notification. Can
// be called after getting SQLITE_LOCKED_SHAREDCACHE.
//
void
wait ();
public:
// Reset active statements.
//
void
clear ();
private:
connection (const connection&);
connection& operator= (const connection&);
private:
void
init ();
private:
auto_handle<sqlite3> handle_;
// Keep statement_cache_ after handle_ so that it is destroyed before
// the connection is closed.
//
details::unique_ptr<statement_cache_type> statement_cache_;
// Unlock notification machinery.
//
private:
bool unlocked_;
details::mutex unlock_mutex_;
details::condition unlock_cond_;
friend void
connection_unlock_callback (void**, int);
private:
friend class transaction_impl; // invalidate_results()
// Linked list of active objects currently associated
// with this connection.
//
private:
friend class active_object;
active_object* active_objects_;
};
class LIBODB_SQLITE_EXPORT connection_factory:
public odb::connection_factory
{
public:
typedef sqlite::database database_type;
virtual void
database (database_type&);
database_type&
database () {return *db_;}
virtual connection_ptr
connect () = 0;
virtual
~connection_factory ();
connection_factory (): db_ (0) {}
// Needed to break the circular connection_factory-database dependency
// (odb::connection_factory has the odb::database member).
//
protected:
database_type* db_;
};
}
}
#include <odb/sqlite/connection.ixx>
#include <odb/post.hxx>
#endif // ODB_SQLITE_CONNECTION_HXX
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