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#include "connection.h"
#include "error.h"
#include "selectcommand.h"
#include "modifycommand.h"
#include <unistd.h>
static void
noNoticeProcessor(void *, const char *)
{
}
PQ::Connection::Connection(const std::string & info) :
conn(PQconnectdb(info.c_str())),
txDepth(0),
pstmntNo(0),
rolledback(false)
{
if (PQstatus(conn) != CONNECTION_OK) {
throw ConnectionError();
}
PQsetNoticeProcessor(conn, noNoticeProcessor, NULL);
}
PQ::Connection::~Connection()
{
PQfinish(conn);
}
void
PQ::Connection::finish() const
{
if (txDepth != 0) {
rollbackTx();
throw Error("Transaction still open");
}
}
int
PQ::Connection::beginTx() const
{
if (txDepth == 0) {
checkResultFree(PQexec(conn, "BEGIN"), PGRES_COMMAND_OK);
rolledback = false;
}
return ++txDepth;
}
int
PQ::Connection::commitTx() const
{
if (rolledback) {
return rollbackTx();
}
if (--txDepth == 0) {
checkResultFree(PQexec(conn, "COMMIT"), PGRES_COMMAND_OK);
}
return txDepth;
}
int
PQ::Connection::rollbackTx() const
{
if (--txDepth == 0) {
checkResultFree(PQexec(conn, "ROLLBACK"), PGRES_COMMAND_OK);
}
else {
rolledback = true;
}
return txDepth;
}
bool
PQ::Connection::inTx() const
{
return txDepth;
}
void
PQ::Connection::execute(const std::string & sql) const
{
checkResultFree(PQexec(conn, sql.c_str()), PGRES_COMMAND_OK, PGRES_TUPLES_OK);
}
DB::BulkDeleteStyle
PQ::Connection::bulkDeleteStyle() const
{
return DB::BulkDeleteUsingSubSelect;
}
DB::BulkUpdateStyle
PQ::Connection::bulkUpdateStyle() const
{
return DB::BulkUpdateUsingFromSrc;
}
void
PQ::Connection::ping() const
{
if (PQstatus(conn) != CONNECTION_OK) {
if (inTx()) {
throw ConnectionError();
}
PQreset(conn);
if (PQstatus(conn) != CONNECTION_OK) {
throw ConnectionError();
}
}
}
DB::SelectCommand *
PQ::Connection::newSelectCommand(const std::string & sql) const
{
return new SelectCommand(this, sql, pstmntNo++);
}
DB::ModifyCommand *
PQ::Connection::newModifyCommand(const std::string & sql) const
{
return new ModifyCommand(this, sql, pstmntNo++);
}
bool
PQ::Connection::checkResultInt(PGresult * res, int expected, int alt)
{
return (PQresultStatus(res) == expected) || (alt != -1 && (PQresultStatus(res) == alt));
}
PGresult *
PQ::Connection::checkResult(PGresult * res, int expected, int alt) const
{
if (!checkResultInt(res, expected, alt)) {
PQclear(res);
throw Error(PQerrorMessage(conn));
}
return res;
}
void
PQ::Connection::checkResultFree(PGresult * res, int expected, int alt) const
{
if (!checkResultInt(res, expected, alt)) {
PQclear(res);
throw Error(PQerrorMessage(conn));
}
PQclear(res);
}
void
PQ::Connection::beginBulkUpload(const char * table, const char * extra) const
{
char buf[BUFSIZ];
snprintf(buf, BUFSIZ, "COPY %s FROM STDIN %s", table, extra);
checkResultFree(PQexec(conn, buf), PGRES_COPY_IN);
}
void
PQ::Connection::endBulkUpload(const char * msg) const
{
switch (PQputCopyEnd(conn, msg)) {
case 0:// block
sleep(1);
endBulkUpload(msg);
return;
case 1:// success
checkResultFree(PQgetResult(conn), PGRES_COMMAND_OK);
return;
default:// -1 is error
throw Error(PQerrorMessage(conn));
}
}
size_t
PQ::Connection::bulkUploadData(const char * data, size_t len) const
{
switch (PQputCopyData(conn, data, len)) {
case 0:// block
sleep(1);
return bulkUploadData(data, len);
case 1:// success
return len;
default:// -1 is error
throw Error(PQerrorMessage(conn));
}
}
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