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// file : odb/sqlite/connection.cxx
// copyright : Copyright (c) 2005-2015 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#include <new> // std::bad_alloc
#include <string>
#include <cassert>
#include <odb/details/lock.hxx>
#include <odb/sqlite/database.hxx>
#include <odb/sqlite/connection.hxx>
#include <odb/sqlite/transaction.hxx>
#include <odb/sqlite/statement.hxx>
#include <odb/sqlite/statement-cache.hxx>
#include <odb/sqlite/prepared-query.hxx>
#include <odb/sqlite/error.hxx>
#include <odb/sqlite/exceptions.hxx> // deadlock
#include <odb/sqlite/details/config.hxx> // LIBODB_SQLITE_HAVE_UNLOCK_NOTIFY
using namespace std;
extern "C" void
odb_sqlite_connection_unlock_callback (void**, int);
namespace odb
{
namespace sqlite
{
connection::
connection (database_type& db, int extra_flags)
: odb::connection (db),
db_ (db),
unlock_cond_ (unlock_mutex_),
statements_ (0)
{
int f (db.flags () | extra_flags);
const string& n (db.name ());
// If we are opening a temporary database, then add the create flag.
//
if (n.empty () || n == ":memory:")
f |= SQLITE_OPEN_CREATE;
// A connection can only be used by a single thread at a time. So
// disable locking in SQLite unless explicitly requested.
//
#if defined(SQLITE_OPEN_NOMUTEX)
if ((f & SQLITE_OPEN_FULLMUTEX) == 0)
f |= SQLITE_OPEN_NOMUTEX;
#endif
sqlite3* h (0);
// sqlite3_open_v2() was only addedin SQLite 3.5.0.
//
#if SQLITE_VERSION_NUMBER >= 3005000
const string& vfs (db.vfs ());
int e (
sqlite3_open_v2 (
n.c_str (), &h, f, (vfs.empty () ? 0 : vfs.c_str ())));
#else
// Readonly opening not supported in SQLite earlier than 3.5.0.
//
assert ((f & SQLITE_OPEN_READONLY) == 0);
int e (sqlite3_open (n.c_str (), &h));
#endif
handle_.reset (h);
if (e != SQLITE_OK)
{
if (handle_ == 0)
throw bad_alloc ();
translate_error (e, *this);
}
init ();
}
connection::
connection (database_type& db, sqlite3* handle)
: odb::connection (db),
db_ (db),
handle_ (handle),
unlock_cond_ (unlock_mutex_),
statements_ (0)
{
init ();
}
void connection::
init ()
{
// Enable/disable foreign key constraints.
//
generic_statement st (
*this,
db_.foreign_keys ()
? "PRAGMA foreign_keys=ON"
: "PRAGMA foreign_keys=OFF",
db_.foreign_keys () ? 22 : 23);
st.execute ();
// Create statement cache.
//
statement_cache_.reset (new statement_cache_type (*this));
}
connection::
~connection ()
{
// Destroy prepared query statements before freeing the connections.
//
recycle ();
clear_prepared_map ();
}
transaction_impl* connection::
begin ()
{
return new transaction_impl (
connection_ptr (inc_ref (this)), transaction_impl::deferred);
}
transaction_impl* connection::
begin_immediate ()
{
return new transaction_impl (
connection_ptr (inc_ref (this)), transaction_impl::immediate);
}
transaction_impl* connection::
begin_exclusive ()
{
return new transaction_impl (
connection_ptr (inc_ref (this)), transaction_impl::exclusive);
}
unsigned long long connection::
execute (const char* s, std::size_t n)
{
generic_statement st (*this, s, n);
return st.execute ();
}
inline void
connection_unlock_callback (void** args, int n)
{
for (int i (0); i < n; ++i)
{
connection* c (static_cast<connection*> (args[i]));
details::lock l (c->unlock_mutex_);
c->unlocked_ = true;
c->unlock_cond_.signal ();
}
}
void connection::
wait ()
{
#ifdef LIBODB_SQLITE_HAVE_UNLOCK_NOTIFY
unlocked_ = false;
// unlock_notify() returns SQLITE_OK or SQLITE_LOCKED (deadlock).
//
int e (sqlite3_unlock_notify (handle_,
&odb_sqlite_connection_unlock_callback,
this));
if (e == SQLITE_LOCKED)
throw deadlock ();
details::lock l (unlock_mutex_);
while (!unlocked_)
unlock_cond_.wait ();
#else
translate_error (SQLITE_LOCKED, *this);
#endif
}
void connection::
clear ()
{
// The current first statement will remove itself from the list
// and make the second statement (if any) the new first.
//
while (statements_ != 0)
statements_->reset ();
}
}
}
extern "C" void
odb_sqlite_connection_unlock_callback (void** args, int n)
{
odb::sqlite::connection_unlock_callback (args, n);
}
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