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#include "pq-cursorselectcommand.h"
#include "pq-connection.h"
#include "pq-error.h"
#include <compileTimeFormatter.h>
AdHocFormatter(PQCursorSelectDeclare, "DECLARE %? CURSOR FOR ");
AdHocFormatter(PQCursorSelectFetch, "FETCH %? IN %?");
AdHocFormatter(PQCursorSelectClose, "CLOSE %?");
PQ::CursorSelectCommand::CursorSelectCommand(Connection * conn, const std::string & sql, unsigned int no, const PQ::CommandOptions * pqco) :
DB::Command(sql),
PQ::SelectBase(sql),
PQ::Command(conn, sql, no),
executed(false),
txOpened(false),
fTuples(pqco ? pqco->fetchTuples : 35),
s_fetch(PQCursorSelectFetch::get(fTuples, stmntName)),
s_close(PQCursorSelectClose::get(stmntName))
{
}
PQ::CursorSelectCommand::~CursorSelectCommand()
{
if (executed && PQtransactionStatus(c->conn) != PQTRANS_INERROR) {
c->checkResultFree((PQexec(c->conn, s_close.c_str())), PGRES_COMMAND_OK);
}
if (txOpened) {
c->commitTx();
}
}
std::string
PQ::CursorSelectCommand::mkdeclare() const
{
std::stringstream psql;
PQCursorSelectDeclare::write(psql, stmntName);
prepareSql(psql, sql);
return psql.str();
}
void
PQ::CursorSelectCommand::execute()
{
if (!executed) {
if (!c->inTx()) {
c->beginTx();
txOpened = true;
}
if (s_declare.empty()) {
s_declare = mkdeclare();
}
c->checkResultFree(
PQexecParams(c->conn, s_declare.c_str(), values.size(), NULL, &values.front(), &lengths.front(), NULL, 0),
PGRES_COMMAND_OK);
fetchTuples();
createColumns(execRes);
executed = true;
}
}
void
PQ::CursorSelectCommand::fetchTuples()
{
execRes = c->checkResult(PQexec(c->conn, s_fetch.c_str()), PGRES_TUPLES_OK);
nTuples = PQntuples(execRes);
tuple = -1;
}
bool
PQ::CursorSelectCommand::fetch()
{
execute();
if ((tuple >= (nTuples - 1)) && (nTuples == fTuples)) {
// Delete the previous result set
PQclear(execRes);
execRes = NULL;
fetchTuples();
}
if (tuple++ < (nTuples - 1)) {
return true;
}
else {
PQclear(PQexec(c->conn, s_close.c_str()));
PQclear(execRes);
execRes = NULL;
executed = false;
return false;
}
}
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