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#include "qsqldriver.h"
#include "qdatetime.h"
#include "qsqlerror.h"
#include "qsqlfield.h"
#include "qsqlindex.h"
#include "private/qobject_p.h"
QT_BEGIN_NAMESPACE
static QString prepareIdentifier(const QString &identifier,
QSqlDriver::IdentifierType type, const QSqlDriver *driver)
{
Q_ASSERT( driver != NULL );
QString ret = identifier;
if (!driver->isIdentifierEscaped(identifier, type)) {
ret = driver->escapeIdentifier(identifier, type);
}
return ret;
}
class QSqlDriverPrivate : public QObjectPrivate
{
public:
QSqlDriverPrivate();
virtual ~QSqlDriverPrivate();
public:
// @CHECK: this member is never used. It was named q, which expanded to q_func().
QSqlDriver *q_func();
uint isOpen : 1;
uint isOpenError : 1;
QSqlError error;
QSql::NumericalPrecisionPolicy precisionPolicy;
};
inline QSqlDriverPrivate::QSqlDriverPrivate()
: QObjectPrivate(), isOpen(false), isOpenError(false), precisionPolicy(QSql::LowPrecisionDouble)
{
}
QSqlDriverPrivate::~QSqlDriverPrivate()
{
}
/*!
\class QSqlDriver
\brief The QSqlDriver class is an abstract base class for accessing
specific SQL databases.
\ingroup database
\inmodule QtSql
This class should not be used directly. Use QSqlDatabase instead.
If you want to create your own SQL drivers, you can subclass this
class and reimplement its pure virtual functions and those
virtual functions that you need. See \l{How to Write Your Own
Database Driver} for more information.
\sa QSqlDatabase, QSqlResult
*/
/*!
Constructs a new driver with the given \a parent.
*/
QSqlDriver::QSqlDriver(QObject *parent)
: QObject(*new QSqlDriverPrivate, parent)
{
}
/*!
Destroys the object and frees any allocated resources.
*/
QSqlDriver::~QSqlDriver()
{
}
/*!
\since 4.4
\fn QSqlDriver::notification(const QString &name)
This signal is emitted when the database posts an event notification
that the driver subscribes to. \a name identifies the event notification.
\sa subscribeToNotification()
*/
/*!
\fn bool QSqlDriver::open(const QString &db, const QString &user, const QString& password,
const QString &host, int port, const QString &options)
Derived classes must reimplement this pure virtual function to
open a database connection on database \a db, using user name \a
user, password \a password, host \a host, port \a port and
connection options \a options.
The function must return true on success and false on failure.
\sa setOpen()
*/
/*!
\fn bool QSqlDriver::close()
Derived classes must reimplement this pure virtual function in
order to close the database connection. Return true on success,
false on failure.
\sa open(), setOpen()
*/
/*!
\fn QSqlResult *QSqlDriver::createResult() const
Creates an empty SQL result on the database. Derived classes must
reimplement this function and return a QSqlResult object
appropriate for their database to the caller.
*/
/*!
Returns true if the database connection is open; otherwise returns
false.
*/
bool QSqlDriver::isOpen() const
{
return d_func()->isOpen;
}
/*!
Returns true if the there was an error opening the database
connection; otherwise returns false.
*/
bool QSqlDriver::isOpenError() const
{
return d_func()->isOpenError;
}
/*!
\enum QSqlDriver::DriverFeature
This enum contains a list of features a driver might support. Use
hasFeature() to query whether a feature is supported or not.
\value Transactions Whether the driver supports SQL transactions.
\value QuerySize Whether the database is capable of reporting the size
of a query. Note that some databases do not support returning the size
(i.e. number of rows returned) of a query, in which case
QSqlQuery::size() will return -1.
\value BLOB Whether the driver supports Binary Large Object fields.
\value Unicode Whether the driver supports Unicode strings if the
database server does.
\value PreparedQueries Whether the driver supports prepared query execution.
\value NamedPlaceholders Whether the driver supports the use of named placeholders.
\value PositionalPlaceholders Whether the driver supports the use of positional placeholders.
\value LastInsertId Whether the driver supports returning the Id of the last touched row.
\value BatchOperations Whether the driver supports batched operations, see QSqlQuery::execBatch()
\value SimpleLocking Whether the driver disallows a write lock on a table while other queries have a read lock on it.
\value LowPrecisionNumbers Whether the driver allows fetching numerical values with low precision.
\value EventNotifications Whether the driver supports database event notifications.
\value FinishQuery Whether the driver can do any low-level resource cleanup when QSqlQuery::finish() is called.
\value MultipleResultSets Whether the driver can access multiple result sets returned from batched statements or stored procedures.
More information about supported features can be found in the
\l{sql-driver.html}{Qt SQL driver} documentation.
\sa hasFeature()
*/
/*!
\enum QSqlDriver::StatementType
This enum contains a list of SQL statement (or clause) types the
driver can create.
\value WhereStatement An SQL \c WHERE statement (e.g., \c{WHERE f = 5}).
\value SelectStatement An SQL \c SELECT statement (e.g., \c{SELECT f FROM t}).
\value UpdateStatement An SQL \c UPDATE statement (e.g., \c{UPDATE TABLE t set f = 1}).
\value InsertStatement An SQL \c INSERT statement (e.g., \c{INSERT INTO t (f) values (1)}).
\value DeleteStatement An SQL \c DELETE statement (e.g., \c{DELETE FROM t}).
\sa sqlStatement()
*/
/*!
\enum QSqlDriver::IdentifierType
This enum contains a list of SQL identifier types.
\value FieldName A SQL field name
\value TableName A SQL table name
*/
/*!
\fn bool QSqlDriver::hasFeature(DriverFeature feature) const
Returns true if the driver supports feature \a feature; otherwise
returns false.
Note that some databases need to be open() before this can be
determined.
\sa DriverFeature
*/
/*!
This function sets the open state of the database to \a open.
Derived classes can use this function to report the status of
open().
\sa open(), setOpenError()
*/
void QSqlDriver::setOpen(bool open)
{
d_func()->isOpen = open;
}
/*!
This function sets the open error state of the database to \a
error. Derived classes can use this function to report the status
of open(). Note that if \a error is true the open state of the
database is set to closed (i.e., isOpen() returns false).
\sa open(), setOpen()
*/
void QSqlDriver::setOpenError(bool error)
{
d_func()->isOpenError = error;
if (error)
d_func()->isOpen = false;
}
/*!
This function is called to begin a transaction. If successful,
return true, otherwise return false. The default implementation
does nothing and returns false.
\sa commitTransaction(), rollbackTransaction()
*/
bool QSqlDriver::beginTransaction()
{
return false;
}
/*!
This function is called to commit a transaction. If successful,
return true, otherwise return false. The default implementation
does nothing and returns false.
\sa beginTransaction(), rollbackTransaction()
*/
bool QSqlDriver::commitTransaction()
{
return false;
}
/*!
This function is called to rollback a transaction. If successful,
return true, otherwise return false. The default implementation
does nothing and returns false.
\sa beginTransaction(), commitTransaction()
*/
bool QSqlDriver::rollbackTransaction()
{
return false;
}
/*!
This function is used to set the value of the last error, \a error,
that occurred on the database.
\sa lastError()
*/
void QSqlDriver::setLastError(const QSqlError &error)
{
d_func()->error = error;
}
/*!
Returns a QSqlError object which contains information about the
last error that occurred on the database.
*/
QSqlError QSqlDriver::lastError() const
{
return d_func()->error;
}
/*!
Returns a list of the names of the tables in the database. The
default implementation returns an empty list.
The \a tableType argument describes what types of tables
should be returned. Due to binary compatibility, the string
contains the value of the enum QSql::TableTypes as text.
An empty string should be treated as QSql::Tables for
backward compatibility.
*/
QStringList QSqlDriver::tables(QSql::TableType) const
{
return QStringList();
}
/*!
Returns the primary index for table \a tableName. Returns an empty
QSqlIndex if the table doesn't have a primary index. The default
implementation returns an empty index.
*/
QSqlIndex QSqlDriver::primaryIndex(const QString&) const
{
return QSqlIndex();
}
/*!
Returns a QSqlRecord populated with the names of the fields in
table \a tableName. If no such table exists, an empty record is
returned. The default implementation returns an empty record.
*/
QSqlRecord QSqlDriver::record(const QString & /* tableName */) const
{
return QSqlRecord();
}
/*!
Returns the \a identifier escaped according to the database rules.
\a identifier can either be a table name or field name, dependent
on \a type.
The default implementation does nothing.
\sa isIdentifierEscaped()
*/
QString QSqlDriver::escapeIdentifier(const QString &identifier, IdentifierType) const
{
return identifier;
}
/*!
Returns whether \a identifier is escaped according to the database rules.
\a identifier can either be a table name or field name, dependent
on \a type.
\warning Because of binary compatability constraints, this function is not virtual.
If you want to provide your own implementation in your QSqlDriver subclass,
reimplement the isIdentifierEscapedImplementation() slot in your subclass instead.
The isIdentifierEscapedFunction() will dynamically detect the slot and call it.
\sa stripDelimiters(), escapeIdentifier()
*/
bool QSqlDriver::isIdentifierEscaped(const QString &identifier, IdentifierType type) const
{
bool result;
QMetaObject::invokeMethod(const_cast<QSqlDriver*>(this),
"isIdentifierEscapedImplementation", Qt::DirectConnection,
Q_RETURN_ARG(bool, result),
Q_ARG(QString, identifier),
Q_ARG(IdentifierType, type));
return result;
}
/*!
Returns the \a identifier with the leading and trailing delimiters removed,
\a identifier can either be a table name or field name,
dependent on \a type. If \a identifier does not have leading
and trailing delimiter characters, \a identifier is returned without
modification.
\warning Because of binary compatability constraints, this function is not virtual,
If you want to provide your own implementation in your QSqlDriver subclass,
reimplement the stripDelimitersImplementation() slot in your subclass instead.
The stripDelimiters() function will dynamically detect the slot and call it.
\since 4.5
\sa isIdentifierEscaped()
*/
QString QSqlDriver::stripDelimiters(const QString &identifier, IdentifierType type) const
{
QString result;
QMetaObject::invokeMethod(const_cast<QSqlDriver*>(this),
"stripDelimitersImplementation", Qt::DirectConnection,
Q_RETURN_ARG(QString, result),
Q_ARG(QString, identifier),
Q_ARG(IdentifierType, type));
return result;
}
/*!
Returns a SQL statement of type \a type for the table \a tableName
with the values from \a rec. If \a preparedStatement is true, the
string will contain placeholders instead of values.
This method can be used to manipulate tables without having to worry
about database-dependent SQL dialects. For non-prepared statements,
the values will be properly escaped.
*/
QString QSqlDriver::sqlStatement(StatementType type, const QString &tableName,
const QSqlRecord &rec, bool preparedStatement) const
{
int i;
QString s;
s.reserve(128);
switch (type) {
case SelectStatement:
for (i = 0; i < rec.count(); ++i) {
if (rec.isGenerated(i))
s.append(prepareIdentifier(rec.fieldName(i), QSqlDriver::FieldName, this)).append(QLatin1String(", "));
}
if (s.isEmpty())
return s;
s.chop(2);
s.prepend(QLatin1String("SELECT ")).append(QLatin1String(" FROM ")).append(tableName);
break;
case WhereStatement:
if (preparedStatement) {
for (int i = 0; i < rec.count(); ++i) {
s.append(prepareIdentifier(rec.fieldName(i), FieldName,this));
if (rec.isNull(i))
s.append(QLatin1String(" IS NULL"));
else
s.append(QLatin1String(" = ?"));
s.append(QLatin1String(" AND "));
}
} else {
for (i = 0; i < rec.count(); ++i) {
s.append(prepareIdentifier(rec.fieldName(i), QSqlDriver::FieldName, this));
QString val = formatValue(rec.field(i));
if (val == QLatin1String("NULL"))
s.append(QLatin1String(" IS NULL"));
else
s.append(QLatin1String(" = ")).append(val);
s.append(QLatin1String(" AND "));
}
}
if (!s.isEmpty()) {
s.prepend(QLatin1String("WHERE "));
s.chop(5); // remove tailing AND
}
break;
case UpdateStatement:
s.append(QLatin1String("UPDATE ")).append(tableName).append(
QLatin1String(" SET "));
for (i = 0; i < rec.count(); ++i) {
if (!rec.isGenerated(i) || !rec.value(i).isValid())
continue;
s.append(prepareIdentifier(rec.fieldName(i), QSqlDriver::FieldName, this)).append(QLatin1Char('='));
if (preparedStatement)
s.append(QLatin1Char('?'));
else
s.append(formatValue(rec.field(i)));
s.append(QLatin1String(", "));
}
if (s.endsWith(QLatin1String(", ")))
s.chop(2);
else
s.clear();
break;
case DeleteStatement:
s.append(QLatin1String("DELETE FROM ")).append(tableName);
break;
case InsertStatement: {
s.append(QLatin1String("INSERT INTO ")).append(tableName).append(QLatin1String(" ("));
QString vals;
for (i = 0; i < rec.count(); ++i) {
if (!rec.isGenerated(i) || !rec.value(i).isValid())
continue;
s.append(prepareIdentifier(rec.fieldName(i), QSqlDriver::FieldName, this)).append(QLatin1String(", "));
if (preparedStatement)
vals.append(QLatin1Char('?'));
else
vals.append(formatValue(rec.field(i)));
vals.append(QLatin1String(", "));
}
if (vals.isEmpty()) {
s.clear();
} else {
vals.chop(2); // remove trailing comma
s[s.length() - 2] = QLatin1Char(')');
s.append(QLatin1String("VALUES (")).append(vals).append(QLatin1Char(')'));
}
break; }
}
return s;
}
/*!
Returns a string representation of the \a field value for the
database. This is used, for example, when constructing INSERT and
UPDATE statements.
The default implementation returns the value formatted as a string
according to the following rules:
\list
\i If \a field is character data, the value is returned enclosed
in single quotation marks, which is appropriate for many SQL
databases. Any embedded single-quote characters are escaped
(replaced with two single-quote characters). If \a trimStrings is
true (the default is false), all trailing whitespace is trimmed
from the field.
\i If \a field is date/time data, the value is formatted in ISO
format and enclosed in single quotation marks. If the date/time
data is invalid, "NULL" is returned.
\i If \a field is \link QByteArray bytearray\endlink data, and the
driver can edit binary fields, the value is formatted as a
hexadecimal string.
\i For any other field type, toString() is called on its value
and the result of this is returned.
\endlist
\sa QVariant::toString()
*/
QString QSqlDriver::formatValue(const QSqlField &field, bool trimStrings) const
{
const QLatin1String nullTxt("NULL");
QString r;
if (field.isNull())
r = nullTxt;
else {
switch (field.type()) {
case QVariant::Int:
case QVariant::UInt:
if (field.value().type() == QVariant::Bool)
r = field.value().toBool() ? QLatin1String("1") : QLatin1String("0");
else
r = field.value().toString();
break;
#ifndef QT_NO_DATESTRING
case QVariant::Date:
if (field.value().toDate().isValid())
r = QLatin1Char('\'') + field.value().toDate().toString(Qt::ISODate)
+ QLatin1Char('\'');
else
r = nullTxt;
break;
case QVariant::Time:
if (field.value().toTime().isValid())
r = QLatin1Char('\'') + field.value().toTime().toString(Qt::ISODate)
+ QLatin1Char('\'');
else
r = nullTxt;
break;
case QVariant::DateTime:
if (field.value().toDateTime().isValid())
r = QLatin1Char('\'') +
field.value().toDateTime().toString(Qt::ISODate) + QLatin1Char('\'');
else
r = nullTxt;
break;
#endif
case QVariant::String:
case QVariant::Char:
{
QString result = field.value().toString();
if (trimStrings) {
int end = result.length();
while (end && result.at(end-1).isSpace()) /* skip white space from end */
end--;
result.truncate(end);
}
/* escape the "'" character */
result.replace(QLatin1Char('\''), QLatin1String("''"));
r = QLatin1Char('\'') + result + QLatin1Char('\'');
break;
}
case QVariant::Bool:
r = QString::number(field.value().toBool());
break;
case QVariant::ByteArray : {
if (hasFeature(BLOB)) {
QByteArray ba = field.value().toByteArray();
QString res;
static const char hexchars[] = "0123456789abcdef";
for (int i = 0; i < ba.size(); ++i) {
uchar s = (uchar) ba[i];
res += QLatin1Char(hexchars[s >> 4]);
res += QLatin1Char(hexchars[s & 0x0f]);
}
r = QLatin1Char('\'') + res + QLatin1Char('\'');
break;
}
}
default:
r = field.value().toString();
break;
}
}
return r;
}
/*!
Returns the low-level database handle wrapped in a QVariant or an
invalid variant if there is no handle.
\warning Use this with uttermost care and only if you know what you're doing.
\warning The handle returned here can become a stale pointer if the connection
is modified (for example, if you close the connection).
\warning The handle can be NULL if the connection is not open yet.
The handle returned here is database-dependent, you should query the type
name of the variant before accessing it.
This example retrieves the handle for a connection to sqlite:
\snippet doc/src/snippets/code/src_sql_kernel_qsqldriver.cpp 0
This snippet returns the handle for PostgreSQL or MySQL:
\snippet doc/src/snippets/code/src_sql_kernel_qsqldriver.cpp 1
\sa QSqlResult::handle()
*/
QVariant QSqlDriver::handle() const
{
return QVariant();
}
/*!
\fn QSqlRecord QSqlDriver::record(const QSqlQuery& query) const
Use query.record() instead.
*/
/*!
\fn QSqlRecord QSqlDriver::recordInfo(const QString& tablename) const
Use record() instead.
*/
/*!
\fn QSqlRecord QSqlDriver::recordInfo(const QSqlQuery& query) const
Use query.record() instead.
*/
/*!
\fn QString QSqlDriver::nullText() const
sqlStatement() is now used to generate SQL. Use tr("NULL") for example, instead.
*/
/*!
\fn QString QSqlDriver::formatValue(const QSqlField *field, bool trimStrings) const
Use the other formatValue() overload instead.
*/
/*!
This function is called to subscribe to event notifications from the database.
\a name identifies the event notification.
If successful, return true, otherwise return false.
The database must be open when this function is called. When the database is closed
by calling close() all subscribed event notifications are automatically unsubscribed.
Note that calling open() on an already open database may implicitly cause close() to
be called, which will cause the driver to unsubscribe from all event notifications.
When an event notification identified by \a name is posted by the database the
notification() signal is emitted.
\warning Because of binary compatibility constraints, this function is not virtual.
If you want to provide event notification support in your own QSqlDriver subclass,
reimplement the subscribeToNotificationImplementation() slot in your subclass instead.
The subscribeToNotification() function will dynamically detect the slot and call it.
\since 4.4
\sa unsubscribeFromNotification() subscribedToNotifications() QSqlDriver::hasFeature()
*/
bool QSqlDriver::subscribeToNotification(const QString &name)
{
bool result;
QMetaObject::invokeMethod(const_cast<QSqlDriver *>(this),
"subscribeToNotificationImplementation", Qt::DirectConnection,
Q_RETURN_ARG(bool, result),
Q_ARG(QString, name));
return result;
}
/*!
This function is called to unsubscribe from event notifications from the database.
\a name identifies the event notification.
If successful, return true, otherwise return false.
The database must be open when this function is called. All subscribed event
notifications are automatically unsubscribed from when the close() function is called.
After calling \e this function the notification() signal will no longer be emitted
when an event notification identified by \a name is posted by the database.
\warning Because of binary compatibility constraints, this function is not virtual.
If you want to provide event notification support in your own QSqlDriver subclass,
reimplement the unsubscribeFromNotificationImplementation() slot in your subclass instead.
The unsubscribeFromNotification() function will dynamically detect the slot and call it.
\since 4.4
\sa subscribeToNotification() subscribedToNotifications()
*/
bool QSqlDriver::unsubscribeFromNotification(const QString &name)
{
bool result;
QMetaObject::invokeMethod(const_cast<QSqlDriver *>(this),
"unsubscribeFromNotificationImplementation", Qt::DirectConnection,
Q_RETURN_ARG(bool, result),
Q_ARG(QString, name));
return result;
}
/*!
Returns a list of the names of the event notifications that are currently subscribed to.
\warning Because of binary compatibility constraints, this function is not virtual.
If you want to provide event notification support in your own QSqlDriver subclass,
reimplement the subscribedToNotificationsImplementation() slot in your subclass instead.
The subscribedToNotifications() function will dynamically detect the slot and call it.
\since 4.4
\sa subscribeToNotification() unsubscribeFromNotification()
*/
QStringList QSqlDriver::subscribedToNotifications() const
{
QStringList result;
QMetaObject::invokeMethod(const_cast<QSqlDriver *>(this),
"subscribedToNotificationsImplementation", Qt::DirectConnection,
Q_RETURN_ARG(QStringList, result));
return result;
}
/*!
This slot is called to subscribe to event notifications from the database.
\a name identifies the event notification.
If successful, return true, otherwise return false.
The database must be open when this \e slot is called. When the database is closed
by calling close() all subscribed event notifications are automatically unsubscribed.
Note that calling open() on an already open database may implicitly cause close() to
be called, which will cause the driver to unsubscribe from all event notifications.
When an event notification identified by \a name is posted by the database the
notification() signal is emitted.
Reimplement this slot to provide your own QSqlDriver subclass with event notification
support; because of binary compatibility constraints, the subscribeToNotification()
function (introduced in Qt 4.4) is not virtual. Instead, subscribeToNotification()
will dynamically detect and call \e this slot. The default implementation does nothing
and returns false.
\since 4.4
\sa subscribeToNotification()
*/
bool QSqlDriver::subscribeToNotificationImplementation(const QString &name)
{
Q_UNUSED(name);
return false;
}
/*!
This slot is called to unsubscribe from event notifications from the database.
\a name identifies the event notification.
If successful, return true, otherwise return false.
The database must be open when \e this slot is called. All subscribed event
notifications are automatically unsubscribed from when the close() function is called.
After calling \e this slot the notification() signal will no longer be emitted
when an event notification identified by \a name is posted by the database.
Reimplement this slot to provide your own QSqlDriver subclass with event notification
support; because of binary compatibility constraints, the unsubscribeFromNotification()
function (introduced in Qt 4.4) is not virtual. Instead, unsubscribeFromNotification()
will dynamically detect and call \e this slot. The default implementation does nothing
and returns false.
\since 4.4
\sa unsubscribeFromNotification()
*/
bool QSqlDriver::unsubscribeFromNotificationImplementation(const QString &name)
{
Q_UNUSED(name);
return false;
}
/*!
Returns a list of the names of the event notifications that are currently subscribed to.
Reimplement this slot to provide your own QSqlDriver subclass with event notification
support; because of binary compatibility constraints, the subscribedToNotifications()
function (introduced in Qt 4.4) is not virtual. Instead, subscribedToNotifications()
will dynamically detect and call \e this slot. The default implementation simply
returns an empty QStringList.
\since 4.4
\sa subscribedToNotifications()
*/
QStringList QSqlDriver::subscribedToNotificationsImplementation() const
{
return QStringList();
}
/*!
\since 4.6
This slot returns whether \a identifier is escaped according to the database rules.
\a identifier can either be a table name or field name, dependent
on \a type.
Because of binary compatability constraints, isIdentifierEscaped() function
(introduced in Qt 4.5) is not virtual. Instead, isIdentifierEscaped() will
dynamically detect and call \e this slot. The default implementation
assumes the escape/delimiter character is a double quote. Reimplement this
slot in your own QSqlDriver if your database engine uses a different
delimiter character.
\sa isIdentifierEscaped()
*/
bool QSqlDriver::isIdentifierEscapedImplementation(const QString &identifier, IdentifierType type) const
{
Q_UNUSED(type);
return identifier.size() > 2
&& identifier.startsWith(QLatin1Char('"')) //left delimited
&& identifier.endsWith(QLatin1Char('"')); //right delimited
}
/*!
\since 4.6
This slot returns \a identifier with the leading and trailing delimiters removed,
\a identifier can either be a tablename or field name, dependent on \a type.
If \a identifier does not have leading and trailing delimiter characters, \a
identifier is returned without modification.
Because of binary compatability constraints, the stripDelimiters() function
(introduced in Qt 4.5) is not virtual. Instead, stripDelimiters() will
dynamically detect and call \e this slot. It generally unnecessary
to reimplement this slot.
\sa stripDelimiters()
*/
QString QSqlDriver::stripDelimitersImplementation(const QString &identifier, IdentifierType type) const
{
QString ret;
if (this->isIdentifierEscaped(identifier, type)) {
ret = identifier.mid(1);
ret.chop(1);
} else {
ret = identifier;
}
return ret;
}
/*!
\since 4.6
Sets the default numerical precision policy used by queries created
by this driver to \a precisionPolicy.
Note: Setting the default precision policy to \a precisionPolicy
doesn't affect any currently active queries.
\sa QSql::NumericalPrecisionPolicy, numericalPrecisionPolicy(),
QSqlQuery::setNumericalPrecisionPolicy(), QSqlQuery::numericalPrecisionPolicy()
*/
void QSqlDriver::setNumericalPrecisionPolicy(QSql::NumericalPrecisionPolicy precisionPolicy)
{
d_func()->precisionPolicy = precisionPolicy;
}
/*!
\since 4.6
Returns the current default precision policy for the database connection.
\sa QSql::NumericalPrecisionPolicy, setNumericalPrecisionPolicy(),
QSqlQuery::numericalPrecisionPolicy(), QSqlQuery::setNumericalPrecisionPolicy()
*/
QSql::NumericalPrecisionPolicy QSqlDriver::numericalPrecisionPolicy() const
{
return d_func()->precisionPolicy;
}
QT_END_NAMESPACE