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// file : odb/mysql/connection.cxx
// copyright : Copyright (c) 2005-2017 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#include <new> // std::bad_alloc
#include <string>
#include <odb/mysql/database.hxx>
#include <odb/mysql/connection.hxx>
#include <odb/mysql/transaction.hxx>
#include <odb/mysql/statement.hxx>
#include <odb/mysql/error.hxx>
#include <odb/mysql/exceptions.hxx>
#include <odb/mysql/statement-cache.hxx>
using namespace std;
namespace odb
{
namespace mysql
{
connection::
connection (connection_factory& cf)
: odb::connection (cf), failed_ (false), active_ (0)
{
if (mysql_init (&mysql_) == 0)
throw bad_alloc ();
handle_.reset (&mysql_);
database_type& db (database ());
if (*db.charset () != '\0')
// Can only fail if we pass an unknown option.
//
mysql_options (handle_, MYSQL_SET_CHARSET_NAME, db.charset ());
// Force the CLIENT_FOUND_ROWS flag so that UPDATE returns the
// number of found rows, not the number of changed rows. This
// is necessary to distinguish between the object-not-persistent
// and nothing-changed conditions.
//
if (mysql_real_connect (handle_,
db.host (),
db.user (),
db.password (),
db.db (),
db.port (),
db.socket (),
db.client_flags () | CLIENT_FOUND_ROWS) == 0)
{
// We cannot use translate_error() here since there is no connection
// yet.
//
unsigned int e (mysql_errno (handle_));
if (e == CR_OUT_OF_MEMORY)
throw bad_alloc ();
throw database_exception (
e, mysql_sqlstate (handle_), mysql_error (handle_));
}
// Do this after we have established the connection.
//
statement_cache_.reset (new statement_cache_type (*this));
}
connection::
connection (connection_factory& cf, MYSQL* handle)
: odb::connection (cf),
failed_ (false),
handle_ (handle),
active_ (0),
statement_cache_ (new statement_cache_type (*this))
{
}
connection::
~connection ()
{
active_ = 0;
// Destroy prepared query statements before freeing the connections.
//
recycle ();
clear_prepared_map ();
if (stmt_handles_.size () > 0)
free_stmt_handles ();
}
transaction_impl* connection::
begin ()
{
return new transaction_impl (connection_ptr (inc_ref (this)));
}
unsigned long long connection::
execute (const char* s, size_t n)
{
clear ();
{
odb::tracer* t;
if ((t = transaction_tracer ()) ||
(t = tracer ()) ||
(t = database ().tracer ()))
{
string str (s, n);
t->execute (*this, str.c_str ());
}
}
if (mysql_real_query (handle_, s, static_cast<unsigned long> (n)))
translate_error (*this);
// Get the affected row count, if any. If the statement has a result
// set (e.g., SELECT), we first need to call mysql_store_result().
//
unsigned long long r (0);
if (mysql_field_count (handle_) == 0)
r = static_cast<unsigned long long> (mysql_affected_rows (handle_));
else
{
if (MYSQL_RES* rs = mysql_store_result (handle_))
{
r = static_cast<unsigned long long> (mysql_num_rows (rs));
mysql_free_result (rs);
}
else
translate_error (*this);
}
return r;
}
bool connection::
ping ()
{
if (failed ())
return false;
if (!mysql_ping (handle_))
return true;
switch (mysql_errno (handle_))
{
case CR_SERVER_LOST:
case CR_SERVER_GONE_ERROR:
{
mark_failed ();
return false;
}
default:
{
translate_error (*this);
return false; // Never reached.
}
}
}
void connection::
clear_ ()
{
active_->cancel (); // Should clear itself from active_.
}
MYSQL_STMT* connection::
alloc_stmt_handle ()
{
MYSQL_STMT* stmt (mysql_stmt_init (handle_));
if (stmt == 0)
throw bad_alloc ();
return stmt;
}
void connection::
free_stmt_handle (auto_handle<MYSQL_STMT>& stmt)
{
if (active_ == 0)
stmt.reset ();
else
{
stmt_handles_.push_back (stmt); // May throw.
stmt.release ();
}
}
void connection::
free_stmt_handles ()
{
for (stmt_handles::iterator i (stmt_handles_.begin ()),
e (stmt_handles_.end ()); i != e; ++i)
{
mysql_stmt_close (*i);
}
stmt_handles_.clear ();
}
// connection_factory
//
connection_factory::
~connection_factory ()
{
}
void connection_factory::
database (database_type& db)
{
odb::connection_factory::db_ = &db;
db_ = &db;
}
}
}
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