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#include "selectcommand.h"
#include "connection.h"
#include "column.h"
#include "error.h"
PQ::SelectCommand::SelectCommand(const Connection * conn, const std::string & sql, unsigned int no) :
DB::Command(sql),
DB::SelectCommand(sql),
PQ::Command(conn, sql, no),
executed(false),
nTuples(0),
tuple(0),
execRes(NULL)
{
}
PQ::SelectCommand::~SelectCommand()
{
if (execRes) {
PQclear(execRes);
}
for (unsigned int f = 0; f < fields.size(); f += 1) {
delete fields[f];
}
}
void
PQ::SelectCommand::execute()
{
if (!executed) {
prepare();
execRes = PQexecPrepared(c->conn, stmntName.c_str(), values.size(), &values.front(), &lengths.front(), &formats.front(), 0);
c->checkResult(execRes, PGRES_TUPLES_OK, __PRETTY_FUNCTION__);
unsigned int nFields = PQnfields(execRes);
fields.resize(nFields);
for (unsigned int f = 0; f < nFields; f += 1) {
Column * c = new Column(this, f);
fields[f] = c;
fieldsName[c->name] = c;
}
nTuples = PQntuples(execRes);
tuple = -1;
executed = true;
}
}
bool
PQ::SelectCommand::fetch()
{
execute();
if (tuple++ < (nTuples - 1)) {
return true;
}
else {
executed = false;
return false;
}
}
const DB::Column&
PQ::SelectCommand::operator[](unsigned int n) const
{
if (n < fields.size()) {
return *fields[n];
}
throw Error();
}
const DB::Column&
PQ::SelectCommand::operator[](const Glib::ustring & n) const
{
std::map<Glib::ustring, Column *>::const_iterator i = fieldsName.find(n);
if (i != fieldsName.end()) {
return *i->second;
}
throw Error();
}
unsigned int
PQ::SelectCommand::getOrdinal(const Glib::ustring & n) const
{
std::map<Glib::ustring, Column *>::const_iterator i = fieldsName.find(n);
if (i != fieldsName.end()) {
return i->second->colNo;
}
throw Error();
}
unsigned int
PQ::SelectCommand::columnCount() const
{
return fields.size();
}
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