unsigned int
CDBConnectionFactory::CalculateConnectionTimeout
(const I_DriverContext& ctx) const
{
unsigned int timeout = 30;
unsigned int to = GetConnectionTimeout();
if (to != 0) {
timeout = to;
}
else {
to = ctx.GetTimeout();
if (to != 0) {
timeout = to;
}
}
return timeout;
}
CDB_Connection* CConnection::CloneCDB_Conn()
{
CHECK_NCBI_DBAPI(m_ds == NULL, "m_ds is not initialized");
CDBDefaultConnParams def_params(
GetCDB_Connection()->ServerName(),
GetCDB_Connection()->UserName(),
GetCDB_Connection()->Password(),
GetModeMask(),
true
);
const CCPPToolkitConnParams params(def_params);
def_params.SetHost(GetCDB_Connection()->Host());
def_params.SetPort(GetCDB_Connection()->Port());
def_params.SetDatabaseName(GetDatabase());
def_params.SetParam("do_not_dispatch", "true");
def_params.SetParam("do_not_read_conf", "true");
I_DriverContext* dctx = m_ds->GetDriverContext();
CDB_Connection* tmp_conn = dctx->MakeConnection(params);
// If the original connection was known to be in a transaction,
// operations using the new one could block on its completion,
// possibly yielding a deadlock. In such cases, ensure that the
// new connection has a reasonable timeout. (MS SQL offers a
// finer-grained LOCK_TIMEOUT setting, but that's not portable,
// even to Sybase, which is more prone to such deadlocks in the
// first place.)
if (GetCDB_Connection()->HasTransaction() && dctx->GetTimeout() == 0) {
tmp_conn->SetTimeout(5);
}
_TRACE("CDB_Connection " << (void*)GetCDB_Connection()
<< " cloned, new CDB_Connection: " << (void*)tmp_conn);
return tmp_conn;
}