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qsql_psql.cpp
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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qsql_psql_p.h"
#include <qcoreapplication.h>
#include <qvariant.h>
#include <qdatetime.h>
#include <qloggingcategory.h>
#include <qregularexpression.h>
#include <qsqlerror.h>
#include <qsqlfield.h>
#include <qsqlindex.h>
#include <qsqlrecord.h>
#include <qsqlquery.h>
#include <qsocketnotifier.h>
#include <qstringlist.h>
#include <qlocale.h>
#include <QtSql/private/qsqlresult_p.h>
#include <QtSql/private/qsqldriver_p.h>
#include <QtCore/private/qlocale_tools_p.h>
#include <queue>
#include <libpq-fe.h>
#include <pg_config.h>
#include <cmath>
// workaround for postgres defining their OIDs in a private header file
#define QBOOLOID 16
#define QINT8OID 20
#define QINT2OID 21
#define QINT4OID 23
#define QNUMERICOID 1700
#define QFLOAT4OID 700
#define QFLOAT8OID 701
#define QABSTIMEOID 702
#define QRELTIMEOID 703
#define QDATEOID 1082
#define QTIMEOID 1083
#define QTIMETZOID 1266
#define QTIMESTAMPOID 1114
#define QTIMESTAMPTZOID 1184
#define QOIDOID 2278
#define QBYTEAOID 17
#define QREGPROCOID 24
#define QXIDOID 28
#define QCIDOID 29
#define QBITOID 1560
#define QVARBITOID 1562
#define VARHDRSZ 4
/* This is a compile time switch - if PQfreemem is declared, the compiler will use that one,
otherwise it'll run in this template */
template <typename T>
inline void PQfreemem(T *t, int = 0) { free(t); }
Q_DECLARE_OPAQUE_POINTER(PGconn*)
Q_DECLARE_METATYPE(PGconn*)
Q_DECLARE_OPAQUE_POINTER(PGresult*)
Q_DECLARE_METATYPE(PGresult*)
QT_BEGIN_NAMESPACE
Q_STATIC_LOGGING_CATEGORY(lcPsql, "qt.sql.postgresql")
using namespace Qt::StringLiterals;
inline void qPQfreemem(void *buffer)
{
PQfreemem(buffer);
}
/* Missing declaration of PGRES_SINGLE_TUPLE for PSQL below 9.2 */
#if !defined PG_VERSION_NUM || PG_VERSION_NUM-0 < 90200
static constexpr int PGRES_SINGLE_TUPLE = 9;
#endif
typedef int StatementId;
static constexpr StatementId InvalidStatementId = 0;
class QPSQLResultPrivate;
class QPSQLResult final : public QSqlResult
{
Q_DECLARE_PRIVATE(QPSQLResult)
public:
QPSQLResult(const QPSQLDriver *db);
~QPSQLResult();
QVariant handle() const override;
void virtual_hook(int id, void *data) override;
protected:
void cleanup();
bool fetch(int i) override;
bool fetchFirst() override;
bool fetchLast() override;
bool fetchNext() override;
bool nextResult() override;
QVariant data(int i) override;
bool isNull(int field) override;
bool reset(const QString &query) override;
int size() override;
int numRowsAffected() override;
QSqlRecord record() const override;
QVariant lastInsertId() const override;
bool prepare(const QString &query) override;
bool exec() override;
};
class QPSQLDriverPrivate final : public QSqlDriverPrivate
{
Q_DECLARE_PUBLIC(QPSQLDriver)
public:
QPSQLDriverPrivate() : QSqlDriverPrivate(QSqlDriver::PostgreSQL) {}
QStringList seid;
PGconn *connection = nullptr;
QSocketNotifier *sn = nullptr;
QPSQLDriver::Protocol pro = QPSQLDriver::Version6;
StatementId currentStmtId = InvalidStatementId;
StatementId stmtCount = InvalidStatementId;
mutable bool pendingNotifyCheck = false;
bool hasBackslashEscape = false;
void appendTables(QStringList &tl, QSqlQuery &t, QChar type);
PGresult *exec(const char *stmt);
PGresult *exec(const QString &stmt);
StatementId sendQuery(const QString &stmt);
bool setSingleRowMode() const;
PGresult *getResult(StatementId stmtId) const;
void finishQuery(StatementId stmtId);
void discardResults() const;
StatementId generateStatementId();
void checkPendingNotifications() const;
QPSQLDriver::Protocol getPSQLVersion();
bool setEncodingUtf8();
void setDatestyle();
void setByteaOutput();
void setUtcTimeZone();
void detectBackslashEscape();
mutable QHash<int, QString> oidToTable;
};
void QPSQLDriverPrivate::appendTables(QStringList &tl, QSqlQuery &t, QChar type)
{
const QString query =
QStringLiteral("SELECT pg_class.relname, pg_namespace.nspname FROM pg_class "
"LEFT JOIN pg_namespace ON (pg_class.relnamespace = pg_namespace.oid) "
"WHERE (pg_class.relkind = '") + type +
QStringLiteral("') AND (pg_class.relname !~ '^Inv') "
"AND (pg_class.relname !~ '^pg_') "
"AND (pg_namespace.nspname != 'information_schema')");
t.exec(query);
while (t.next()) {
QString schema = t.value(1).toString();
if (schema.isEmpty() || schema == "public"_L1)
tl.append(t.value(0).toString());
else
tl.append(t.value(0).toString().prepend(u'.').prepend(schema));
}
}
PGresult *QPSQLDriverPrivate::exec(const char *stmt)
{
// PQexec() silently discards any prior query results that the application didn't eat.
PGresult *result = PQexec(connection, stmt);
currentStmtId = result ? generateStatementId() : InvalidStatementId;
checkPendingNotifications();
return result;
}
PGresult *QPSQLDriverPrivate::exec(const QString &stmt)
{
return exec(stmt.toUtf8().constData());
}
StatementId QPSQLDriverPrivate::sendQuery(const QString &stmt)
{
// Discard any prior query results that the application didn't eat.
// This is required for PQsendQuery()
discardResults();
const int result = PQsendQuery(connection, stmt.toUtf8().constData());
currentStmtId = result ? generateStatementId() : InvalidStatementId;
return currentStmtId;
}
bool QPSQLDriverPrivate::setSingleRowMode() const
{
// Activates single-row mode for last sent query, see:
// https://www.postgresql.org/docs/9.2/static/libpq-single-row-mode.html
// This method should be called immediately after the sendQuery() call.
#if defined PG_VERSION_NUM && PG_VERSION_NUM-0 >= 90200
return PQsetSingleRowMode(connection) > 0;
#else
return false;
#endif
}
PGresult *QPSQLDriverPrivate::getResult(StatementId stmtId) const
{
// Make sure the results of stmtId weren't discarded. This might
// happen for forward-only queries if somebody executed another
// SQL query on the same db connection.
if (stmtId != currentStmtId) {
// If you change the following warning, remember to update it
// on sql-driver.html page too.
qCWarning(lcPsql, "QPSQLDriver::getResult: Query results lost - "
"probably discarded on executing another SQL query.");
return nullptr;
}
PGresult *result = PQgetResult(connection);
checkPendingNotifications();
return result;
}
void QPSQLDriverPrivate::finishQuery(StatementId stmtId)
{
if (stmtId != InvalidStatementId && stmtId == currentStmtId) {
discardResults();
currentStmtId = InvalidStatementId;
}
}
void QPSQLDriverPrivate::discardResults() const
{
while (PGresult *result = PQgetResult(connection))
PQclear(result);
}
StatementId QPSQLDriverPrivate::generateStatementId()
{
StatementId stmtId = ++stmtCount;
if (stmtId <= 0)
stmtId = stmtCount = 1;
return stmtId;
}
void QPSQLDriverPrivate::checkPendingNotifications() const
{
Q_Q(const QPSQLDriver);
if (seid.size() && !pendingNotifyCheck) {
pendingNotifyCheck = true;
QMetaObject::invokeMethod(const_cast<QPSQLDriver*>(q), &QPSQLDriver::_q_handleNotification, Qt::QueuedConnection);
}
}
class QPSQLResultPrivate final : public QSqlResultPrivate
{
Q_DECLARE_PUBLIC(QPSQLResult)
public:
Q_DECLARE_SQLDRIVER_PRIVATE(QPSQLDriver)
using QSqlResultPrivate::QSqlResultPrivate;
QString fieldSerial(qsizetype i) const override { return QString("$%1"_L1).arg(i + 1); }
void deallocatePreparedStmt();
std::queue<PGresult*> nextResultSets;
QString preparedStmtId;
PGresult *result = nullptr;
StatementId stmtId = InvalidStatementId;
int currentSize = -1;
bool canFetchMoreRows = false;
bool preparedQueriesEnabled = false;
bool processResults();
};
static QSqlError qMakeError(const QString &err, QSqlError::ErrorType type,
const QPSQLDriverPrivate *p, PGresult *result = nullptr)
{
const char *s = PQerrorMessage(p->connection);
QString msg = QString::fromUtf8(s);
QString errorCode;
if (result) {
errorCode = QString::fromLatin1(PQresultErrorField(result, PG_DIAG_SQLSTATE));
msg += QString::fromLatin1("(%1)").arg(errorCode);
}
return QSqlError("QPSQL: "_L1 + err, msg, type, errorCode);
}
bool QPSQLResultPrivate::processResults()
{
Q_Q(QPSQLResult);
if (!result) {
q->setSelect(false);
q->setActive(false);
currentSize = -1;
canFetchMoreRows = false;
if (stmtId != drv_d_func()->currentStmtId) {
q->setLastError(qMakeError(QCoreApplication::translate("QPSQLResult",
"Query results lost - probably discarded on executing "
"another SQL query."), QSqlError::StatementError, drv_d_func(), result));
}
return false;
}
int status = PQresultStatus(result);
switch (status) {
case PGRES_TUPLES_OK:
q->setSelect(true);
q->setActive(true);
currentSize = q->isForwardOnly() ? -1 : PQntuples(result);
canFetchMoreRows = false;
return true;
case PGRES_SINGLE_TUPLE:
q->setSelect(true);
q->setActive(true);
currentSize = -1;
canFetchMoreRows = true;
return true;
case PGRES_COMMAND_OK:
q->setSelect(false);
q->setActive(true);
currentSize = -1;
canFetchMoreRows = false;
return true;
default:
break;
}
q->setSelect(false);
q->setActive(false);
currentSize = -1;
canFetchMoreRows = false;
q->setLastError(qMakeError(QCoreApplication::translate("QPSQLResult",
"Unable to create query"), QSqlError::StatementError, drv_d_func(), result));
return false;
}
static QMetaType qDecodePSQLType(int t)
{
int type = QMetaType::UnknownType;
switch (t) {
case QBOOLOID:
type = QMetaType::Bool;
break;
case QINT8OID:
type = QMetaType::LongLong;
break;
case QINT2OID:
case QINT4OID:
case QOIDOID:
case QREGPROCOID:
case QXIDOID:
case QCIDOID:
type = QMetaType::Int;
break;
case QNUMERICOID:
case QFLOAT4OID:
case QFLOAT8OID:
type = QMetaType::Double;
break;
case QABSTIMEOID:
case QRELTIMEOID:
case QDATEOID:
type = QMetaType::QDate;
break;
case QTIMEOID:
case QTIMETZOID:
type = QMetaType::QTime;
break;
case QTIMESTAMPOID:
case QTIMESTAMPTZOID:
type = QMetaType::QDateTime;
break;
case QBYTEAOID:
type = QMetaType::QByteArray;
break;
default:
type = QMetaType::QString;
break;
}
return QMetaType(type);
}
void QPSQLResultPrivate::deallocatePreparedStmt()
{
if (drv_d_func()) {
const QString stmt = QStringLiteral("DEALLOCATE ") + preparedStmtId;
PGresult *result = drv_d_func()->exec(stmt);
if (PQresultStatus(result) != PGRES_COMMAND_OK) {
const QString msg = QString::fromUtf8(PQerrorMessage(drv_d_func()->connection));
qCWarning(lcPsql, "Unable to free statement: %ls.", qUtf16Printable(msg));
}
PQclear(result);
}
preparedStmtId.clear();
}
QPSQLResult::QPSQLResult(const QPSQLDriver *db)
: QSqlResult(*new QPSQLResultPrivate(this, db))
{
Q_D(QPSQLResult);
d->preparedQueriesEnabled = db->hasFeature(QSqlDriver::PreparedQueries);
}
QPSQLResult::~QPSQLResult()
{
Q_D(QPSQLResult);
cleanup();
if (d->preparedQueriesEnabled && !d->preparedStmtId.isNull())
d->deallocatePreparedStmt();
}
QVariant QPSQLResult::handle() const
{
Q_D(const QPSQLResult);
return QVariant::fromValue(d->result);
}
void QPSQLResult::cleanup()
{
Q_D(QPSQLResult);
if (d->result)
PQclear(d->result);
d->result = nullptr;
while (!d->nextResultSets.empty()) {
PQclear(d->nextResultSets.front());
d->nextResultSets.pop();
}
if (d->stmtId != InvalidStatementId) {
if (d->drv_d_func())
d->drv_d_func()->finishQuery(d->stmtId);
}
d->stmtId = InvalidStatementId;
setAt(QSql::BeforeFirstRow);
d->currentSize = -1;
d->canFetchMoreRows = false;
setActive(false);
}
bool QPSQLResult::fetch(int i)
{
Q_D(const QPSQLResult);
if (!isActive())
return false;
if (i < 0)
return false;
if (at() == i)
return true;
if (isForwardOnly()) {
if (i < at())
return false;
bool ok = true;
while (ok && i > at())
ok = fetchNext();
return ok;
}
if (i >= d->currentSize)
return false;
setAt(i);
return true;
}
bool QPSQLResult::fetchFirst()
{
Q_D(const QPSQLResult);
if (!isActive())
return false;
if (at() == 0)
return true;
if (isForwardOnly()) {
if (at() == QSql::BeforeFirstRow) {
// First result has been already fetched by exec() or
// nextResult(), just check it has at least one row.
if (d->result && PQntuples(d->result) > 0) {
setAt(0);
return true;
}
}
return false;
}
return fetch(0);
}
bool QPSQLResult::fetchLast()
{
Q_D(const QPSQLResult);
if (!isActive())
return false;
if (isForwardOnly()) {
// Cannot seek to last row in forwardOnly mode, so we have to use brute force
int i = at();
if (i == QSql::AfterLastRow)
return false;
if (i == QSql::BeforeFirstRow)
i = 0;
while (fetchNext())
++i;
setAt(i);
return true;
}
return fetch(d->currentSize - 1);
}
bool QPSQLResult::fetchNext()
{
Q_D(QPSQLResult);
if (!isActive())
return false;
const int currentRow = at(); // Small optimalization
if (currentRow == QSql::BeforeFirstRow)
return fetchFirst();
if (currentRow == QSql::AfterLastRow)
return false;
if (isForwardOnly()) {
if (!d->canFetchMoreRows)
return false;
PQclear(d->result);
d->result = d->drv_d_func()->getResult(d->stmtId);
if (!d->result) {
setLastError(qMakeError(QCoreApplication::translate("QPSQLResult",
"Unable to get result"), QSqlError::StatementError, d->drv_d_func(), d->result));
d->canFetchMoreRows = false;
return false;
}
int status = PQresultStatus(d->result);
switch (status) {
case PGRES_SINGLE_TUPLE:
// Fetched next row of current result set
Q_ASSERT(PQntuples(d->result) == 1);
Q_ASSERT(d->canFetchMoreRows);
setAt(currentRow + 1);
return true;
case PGRES_TUPLES_OK:
// In single-row mode PGRES_TUPLES_OK means end of current result set
Q_ASSERT(PQntuples(d->result) == 0);
d->canFetchMoreRows = false;
return false;
default:
setLastError(qMakeError(QCoreApplication::translate("QPSQLResult",
"Unable to get result"), QSqlError::StatementError, d->drv_d_func(), d->result));
d->canFetchMoreRows = false;
return false;
}
}
if (currentRow + 1 >= d->currentSize)
return false;
setAt(currentRow + 1);
return true;
}
bool QPSQLResult::nextResult()
{
Q_D(QPSQLResult);
if (!isActive())
return false;
setAt(QSql::BeforeFirstRow);
if (isForwardOnly()) {
if (d->canFetchMoreRows) {
// Skip all rows from current result set
while (d->result && PQresultStatus(d->result) == PGRES_SINGLE_TUPLE) {
PQclear(d->result);
d->result = d->drv_d_func()->getResult(d->stmtId);
}
d->canFetchMoreRows = false;
// Check for unexpected errors
if (d->result && PQresultStatus(d->result) == PGRES_FATAL_ERROR)
return d->processResults();
}
// Fetch first result from next result set
if (d->result)
PQclear(d->result);
d->result = d->drv_d_func()->getResult(d->stmtId);
return d->processResults();
}
if (d->result)
PQclear(d->result);
d->result = nullptr;
if (!d->nextResultSets.empty()) {
d->result = d->nextResultSets.front();
d->nextResultSets.pop();
}
return d->processResults();
}
QVariant QPSQLResult::data(int i)
{
Q_D(const QPSQLResult);
if (i >= PQnfields(d->result)) {
qCWarning(lcPsql, "QPSQLResult::data: column %d out of range.", i);
return QVariant();
}
const int currentRow = isForwardOnly() ? 0 : at();
int ptype = PQftype(d->result, i);
QMetaType type = qDecodePSQLType(ptype);
if (PQgetisnull(d->result, currentRow, i))
return QVariant(type, nullptr);
const char *val = PQgetvalue(d->result, currentRow, i);
switch (type.id()) {
case QMetaType::Bool:
return QVariant((bool)(val[0] == 't'));
case QMetaType::QString:
return QString::fromUtf8(val);
case QMetaType::LongLong:
if (val[0] == '-')
return QByteArray::fromRawData(val, qstrlen(val)).toLongLong();
else
return QByteArray::fromRawData(val, qstrlen(val)).toULongLong();
case QMetaType::Int:
return atoi(val);
case QMetaType::Double: {
if (ptype == QNUMERICOID) {
if (numericalPrecisionPolicy() == QSql::HighPrecision)
return QString::fromLatin1(val);
}
bool ok;
double dbl = qstrtod(val, nullptr, &ok);
if (!ok) {
if (qstricmp(val, "NaN") == 0)
dbl = qQNaN();
else if (qstricmp(val, "Infinity") == 0)
dbl = qInf();
else if (qstricmp(val, "-Infinity") == 0)
dbl = -qInf();
else
return QVariant();
}
if (ptype == QNUMERICOID) {
if (numericalPrecisionPolicy() == QSql::LowPrecisionInt64)
return QVariant((qlonglong)dbl);
else if (numericalPrecisionPolicy() == QSql::LowPrecisionInt32)
return QVariant((int)dbl);
else if (numericalPrecisionPolicy() == QSql::LowPrecisionDouble)
return QVariant(dbl);
}
return dbl;
}
#if QT_CONFIG(datestring)
case QMetaType::QDate:
return QVariant(QDate::fromString(QString::fromLatin1(val), Qt::ISODate));
case QMetaType::QTime:
return QVariant(QTime::fromString(QString::fromLatin1(val), Qt::ISODate));
case QMetaType::QDateTime: {
const QLatin1StringView tzString(val);
const auto timeString(tzString.sliced(11));
if (timeString.contains(u'-') || timeString.contains(u'+') || timeString.endsWith(u'Z'))
return QDateTime::fromString(tzString, Qt::ISODate);
const auto utc = tzString.toString() + u'Z';
return QVariant(QDateTime::fromString(utc, Qt::ISODate));
}
#else
case QMetaType::QDate:
case QMetaType::QTime:
case QMetaType::QDateTime:
return QVariant(QString::fromLatin1(val));
#endif
case QMetaType::QByteArray: {
size_t len;
unsigned char *data = PQunescapeBytea(reinterpret_cast<const unsigned char *>(val), &len);
QByteArray ba(reinterpret_cast<const char *>(data), len);
qPQfreemem(data);
return QVariant(ba);
}
default:
qCWarning(lcPsql, "QPSQLResult::data: unhandled data type %d.", type.id());
}
return QVariant();
}
bool QPSQLResult::isNull(int field)
{
Q_D(const QPSQLResult);
const int currentRow = isForwardOnly() ? 0 : at();
return PQgetisnull(d->result, currentRow, field);
}
bool QPSQLResult::reset(const QString &query)
{
Q_D(QPSQLResult);
cleanup();
if (!driver())
return false;
if (!driver()->isOpen() || driver()->isOpenError())
return false;
d->stmtId = d->drv_d_func()->sendQuery(query);
if (d->stmtId == InvalidStatementId) {
setLastError(qMakeError(QCoreApplication::translate("QPSQLResult",
"Unable to send query"), QSqlError::StatementError, d->drv_d_func()));
return false;
}
if (isForwardOnly())
setForwardOnly(d->drv_d_func()->setSingleRowMode());
d->result = d->drv_d_func()->getResult(d->stmtId);
if (!isForwardOnly()) {
// Fetch all result sets right away
while (PGresult *nextResultSet = d->drv_d_func()->getResult(d->stmtId))
d->nextResultSets.push(nextResultSet);
}
return d->processResults();
}
int QPSQLResult::size()
{
Q_D(const QPSQLResult);
return d->currentSize;
}
int QPSQLResult::numRowsAffected()
{
Q_D(const QPSQLResult);
const char *tuples = PQcmdTuples(d->result);
return QByteArray::fromRawData(tuples, qstrlen(tuples)).toInt();
}
QVariant QPSQLResult::lastInsertId() const
{
Q_D(const QPSQLResult);
if (d->drv_d_func()->pro >= QPSQLDriver::Version8_1) {
QSqlQuery qry(driver()->createResult());
// Most recent sequence value obtained from nextval
if (qry.exec(QStringLiteral("SELECT lastval();")) && qry.next())
return qry.value(0);
} else if (isActive()) {
Oid id = PQoidValue(d->result);
if (id != InvalidOid)
return QVariant(id);
}
return QVariant();
}
QSqlRecord QPSQLResult::record() const
{
Q_D(const QPSQLResult);
QSqlRecord info;
if (!isActive() || !isSelect())
return info;
int count = PQnfields(d->result);
QSqlField f;
for (int i = 0; i < count; ++i) {
f.setName(QString::fromUtf8(PQfname(d->result, i)));
const int tableOid = PQftable(d->result, i);
// WARNING: We cannot execute any other SQL queries on
// the same db connection while forward-only mode is active
// (this would discard all results of forward-only query).
// So we just skip this...
if (tableOid != InvalidOid && !isForwardOnly()) {
auto &tableName = d->drv_d_func()->oidToTable[tableOid];
if (tableName.isEmpty()) {
QSqlQuery qry(driver()->createResult());
if (qry.exec(QStringLiteral("SELECT relname FROM pg_class WHERE pg_class.oid = %1")
.arg(tableOid)) && qry.next()) {
tableName = qry.value(0).toString();
}
}
f.setTableName(tableName);
} else {
f.setTableName(QString());
}
int ptype = PQftype(d->result, i);
f.setMetaType(qDecodePSQLType(ptype));
f.setValue(QVariant(f.metaType())); // only set in setType() when it's invalid before
int len = PQfsize(d->result, i);
int precision = PQfmod(d->result, i);
switch (ptype) {
case QTIMESTAMPOID:
case QTIMESTAMPTZOID:
precision = 3;
break;
case QNUMERICOID:
if (precision != -1) {
len = (precision >> 16);
precision = ((precision - VARHDRSZ) & 0xffff);
}
break;
case QBITOID:
case QVARBITOID:
len = precision;
precision = -1;
break;
default:
if (len == -1 && precision >= VARHDRSZ) {
len = precision - VARHDRSZ;
precision = -1;
}
}
f.setLength(len);
f.setPrecision(precision);
info.append(f);
}
return info;
}
void QPSQLResult::virtual_hook(int id, void *data)
{
Q_ASSERT(data);
QSqlResult::virtual_hook(id, data);
}
static QString qCreateParamString(const QList<QVariant> &boundValues, const QSqlDriver *driver)
{
if (boundValues.isEmpty())
return QString();
QString params;
QSqlField f;
for (const QVariant &val : boundValues) {
f.setMetaType(val.metaType());
if (QSqlResultPrivate::isVariantNull(val))
f.clear();
else
f.setValue(val);
if (!params.isNull())
params.append(", "_L1);
params.append(driver->formatValue(f));
}
return params;
}
QString qMakePreparedStmtId()
{
Q_CONSTINIT static QBasicAtomicInt qPreparedStmtCount = Q_BASIC_ATOMIC_INITIALIZER(0);
QString id = QStringLiteral("qpsqlpstmt_") + QString::number(qPreparedStmtCount.fetchAndAddRelaxed(1) + 1, 16);
return id;
}
bool QPSQLResult::prepare(const QString &query)
{
Q_D(QPSQLResult);
if (!d->preparedQueriesEnabled)
return QSqlResult::prepare(query);
cleanup();
if (!d->preparedStmtId.isEmpty())
d->deallocatePreparedStmt();
const QString stmtId = qMakePreparedStmtId();
const QString stmt = QStringLiteral("PREPARE %1 AS ").arg(stmtId).append(d->positionalToNamedBinding(query));
PGresult *result = d->drv_d_func()->exec(stmt);
if (PQresultStatus(result) != PGRES_COMMAND_OK) {
setLastError(qMakeError(QCoreApplication::translate("QPSQLResult",
"Unable to prepare statement"), QSqlError::StatementError, d->drv_d_func(), result));
PQclear(result);
d->preparedStmtId.clear();
return false;
}
PQclear(result);
d->preparedStmtId = stmtId;
return true;
}
bool QPSQLResult::exec()
{
Q_D(QPSQLResult);
if (!d->preparedQueriesEnabled)
return QSqlResult::exec();
cleanup();
QString stmt;
const QString params = qCreateParamString(boundValues(), driver());
if (params.isEmpty())
stmt = QStringLiteral("EXECUTE %1").arg(d->preparedStmtId);
else
stmt = QStringLiteral("EXECUTE %1 (%2)").arg(d->preparedStmtId, params);
d->stmtId = d->drv_d_func()->sendQuery(stmt);
if (d->stmtId == InvalidStatementId) {
setLastError(qMakeError(QCoreApplication::translate("QPSQLResult",
"Unable to send query"), QSqlError::StatementError, d->drv_d_func()));
return false;
}
if (isForwardOnly())
setForwardOnly(d->drv_d_func()->setSingleRowMode());
d->result = d->drv_d_func()->getResult(d->stmtId);
if (!isForwardOnly()) {
// Fetch all result sets right away
while (PGresult *nextResultSet = d->drv_d_func()->getResult(d->stmtId))
d->nextResultSets.push(nextResultSet);
}
return d->processResults();
}
///////////////////////////////////////////////////////////////////
bool QPSQLDriverPrivate::setEncodingUtf8()
{
PGresult *result = exec("SET CLIENT_ENCODING TO 'UNICODE'");
int status = PQresultStatus(result);
PQclear(result);
return status == PGRES_COMMAND_OK;
}
void QPSQLDriverPrivate::setDatestyle()
{
PGresult *result = exec("SET DATESTYLE TO 'ISO'");
int status = PQresultStatus(result);
if (status != PGRES_COMMAND_OK)
qCWarning(lcPsql) << QString::fromUtf8(PQerrorMessage(connection));
PQclear(result);
}
void QPSQLDriverPrivate::setByteaOutput()
{
if (pro >= QPSQLDriver::Version9) {
// Server version before QPSQLDriver::Version9 only supports escape mode for bytea type,
// but bytea format is set to hex by default in PSQL 9 and above. So need to force the
// server to use the old escape mode when connects to the new server.
PGresult *result = exec("SET bytea_output TO escape");
int status = PQresultStatus(result);
if (status != PGRES_COMMAND_OK)
qCWarning(lcPsql) << QString::fromUtf8(PQerrorMessage(connection));
PQclear(result);
}
}
void QPSQLDriverPrivate::setUtcTimeZone()
{
PGresult *result = exec("SET TIME ZONE 'UTC'");
int status = PQresultStatus(result);
if (status != PGRES_COMMAND_OK)
qCWarning(lcPsql) << QString::fromUtf8(PQerrorMessage(connection));
PQclear(result);
}
void QPSQLDriverPrivate::detectBackslashEscape()
{
// standard_conforming_strings option introduced in 8.2
// http://www.postgresql.org/docs/8.2/static/runtime-config-compatible.html
if (pro < QPSQLDriver::Version8_2) {
hasBackslashEscape = true;
} else {
hasBackslashEscape = false;
PGresult *result = exec(QStringLiteral("SELECT '\\\\' x"));
int status = PQresultStatus(result);
if (status == PGRES_COMMAND_OK || status == PGRES_TUPLES_OK)
if (QString::fromLatin1(PQgetvalue(result, 0, 0)) == "\\"_L1)
hasBackslashEscape = true;
PQclear(result);
}
}
static QPSQLDriver::Protocol qMakePSQLVersion(int vMaj, int vMin)
{
switch (vMaj) {
case 6:
return QPSQLDriver::Version6;
case 7:
{
switch (vMin) {
case 1:
return QPSQLDriver::Version7_1;
case 3:
return QPSQLDriver::Version7_3;
case 4:
return QPSQLDriver::Version7_4;
default:
return QPSQLDriver::Version7;
}
break;
}
case 8:
{
switch (vMin) {
case 1:
return QPSQLDriver::Version8_1;
case 2:
return QPSQLDriver::Version8_2;
case 3:
return QPSQLDriver::Version8_3;
case 4:
return QPSQLDriver::Version8_4;
default:
return QPSQLDriver::Version8;
}
break;
}
case 9: