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// file : odb/pgsql/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 <cstring> // std::strcmp
#include <cstdlib> // std::atol
#include <libpq-fe.h>
#include <odb/pgsql/database.hxx>
#include <odb/pgsql/connection.hxx>
#include <odb/pgsql/transaction.hxx>
#include <odb/pgsql/error.hxx>
#include <odb/pgsql/exceptions.hxx>
#include <odb/pgsql/statement-cache.hxx>
using namespace std;
extern "C" void
odb_pgsql_process_notice (void*, const char*)
{
}
namespace odb
{
namespace pgsql
{
connection::
connection (database_type& db)
: odb::connection (db), db_ (db), failed_ (false)
{
handle_.reset (PQconnectdb (db.conninfo ().c_str ()));
if (handle_ == 0)
throw bad_alloc ();
else if (PQstatus (handle_) == CONNECTION_BAD)
throw database_exception (PQerrorMessage (handle_));
init ();
}
connection::
connection (database_type& db, PGconn* handle)
: odb::connection (db), db_ (db), handle_ (handle), failed_ (false)
{
init ();
}
void connection::
init ()
{
// Establish whether date/time values are represented as
// 8-byte integers.
//
if (strcmp (PQparameterStatus (handle_, "integer_datetimes"), "on") != 0)
throw database_exception ("unsupported binary format for PostgreSQL "
"date-time SQL types");
// Suppress server notifications to stdout.
//
PQsetNoticeProcessor (handle_, &odb_pgsql_process_notice, 0);
// 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)));
}
unsigned long long connection::
execute (const char* s, std::size_t n)
{
// The string may not be '\0'-terminated.
//
string str (s, n);
{
odb::tracer* t;
if ((t = transaction_tracer ()) ||
(t = tracer ()) ||
(t = database ().tracer ()))
t->execute (*this, str.c_str ());
}
auto_handle<PGresult> h (PQexec (handle_, str.c_str ()));
unsigned long long count (0);
if (!is_good_result (h))
translate_error (*this, h);
else if (PGRES_TUPLES_OK == PQresultStatus (h))
count = static_cast<unsigned long long> (PQntuples (h));
else
{
const char* s (PQcmdTuples (h));
if (s[0] != '\0' && s[1] == '\0')
count = static_cast<unsigned long long> (s[0] - '0');
else
count = static_cast<unsigned long long> (atol (s));
}
return count;
}
}
}
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