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Overview
Comment:Removed need for Impl parameter to ResultBase::fetch_row() and its derivatives. ResultBase can provide the implementation object to the DBDriver layer, which is the only code that needed this.
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 3f91a82d135d525cedc1ea547c7ea5a0fc55554d
User & Date: tangent 2015-12-18 22:42:06
Context
2015-12-18
23:29
Copying the refcounted pointer to the FieldNames object in Row::operator =() instead of copying the field names. We can share the object. check-in: 1e03cb233c user: tangent tags: trunk
22:42
Removed need for Impl parameter to ResultBase::fetch_row() and its derivatives. ResultBase can provide the implementation object to the DBDriver layer, which is the only code that needed this. check-in: 3f91a82d13 user: tangent tags: trunk
22:24
STL on OS X can't cope with vector::at() assignments when the space has only been set aside with vector::reserve(). It wants either a resize() call to set the space aside definitely, or push_back() to extend the vector into the reserved space. (This is probably a sanity check like the old SafeSTL, rather than an actual memory bug, but it has the same effect as a crash.) check-in: 24d069b506 user: tangent tags: trunk
Changes
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Changes to src/dbdriver.h. 

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	virtual void fetch_fields(Fields& fl, ResultBase::Impl& impl) const = 0;
	
	/// \brief Returns the lengths of the fields in the current row
	virtual const unsigned long* fetch_lengths(
			ResultBase::Impl& impl) const = 0;

	/// \brief Returns the next row from the given "use" query result set.
	virtual Row fetch_row(ResultBase& res, ResultBase::Impl& impl) = 0;

	/// \brief Releases memory used by a result set
	virtual void free_result(ResultBase::Impl& impl) const = 0;

	/// \brief Get the ID last generated for an INSERT by the DBMS.
	///
	/// The semantic meaning of this call varies among DBMSes because








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	virtual void fetch_fields(Fields& fl, ResultBase::Impl& impl) const = 0;
	
	/// \brief Returns the lengths of the fields in the current row
	virtual const unsigned long* fetch_lengths(
			ResultBase::Impl& impl) const = 0;

	/// \brief Returns the next row from the given "use" query result set.
	virtual Row fetch_row(ResultBase& res) = 0;

	/// \brief Releases memory used by a result set
	virtual void free_result(ResultBase::Impl& impl) const = 0;

	/// \brief Get the ID last generated for an INSERT by the DBMS.
	///
	/// The semantic meaning of this call varies among DBMSes because

Changes to src/mysql/driver.cpp. 

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	}

	mysql_field_seek(pres, 0);	// semantics break otherwise!
}


Row
MySQLDriver::fetch_row(ResultBase& res, ResultBase::Impl& impl)
// FIXME: Why do we need the impl param?  Can't we get that from res?
{
	if (MYSQL_ROW raw = mysql_fetch_row(MYSQL_RES_FROM_IMPL(impl))) {
		Row::size_type size = res.num_fields();
		Row::Impl* pd = new Row::Impl;
		pd->reserve(size);
		const unsigned long* lengths = fetch_lengths(impl);
		for (Row::size_type i = 0; i < size; ++i) {
			bool is_null = raw[i] == 0;
			pd->push_back(Row::value_type(
					is_null ? "NULL" : raw[i],
					is_null ? 4 : lengths[i],
					res.field_type(int(i)).base_type(),
					is_null));








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	}

	mysql_field_seek(pres, 0);	// semantics break otherwise!
}


Row
MySQLDriver::fetch_row(ResultBase& res)

{
	if (MYSQL_ROW raw = mysql_fetch_row(MYSQL_RES_FROM_IMPL(res.impl()))) {
		Row::size_type size = res.num_fields();
		Row::Impl* pd = new Row::Impl;
		pd->reserve(size);
		const unsigned long* lengths = fetch_lengths(res.impl());
		for (Row::size_type i = 0; i < size; ++i) {
			bool is_null = raw[i] == 0;
			pd->push_back(Row::value_type(
					is_null ? "NULL" : raw[i],
					is_null ? 4 : lengths[i],
					res.field_type(int(i)).base_type(),
					is_null));

Changes to src/mysql/driver.h. 

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		return !mysql_real_query(&mysql_, qstr,
				static_cast<unsigned long>(length));
	}

	/// \brief Returns the next DB row from the given result set.
	///
	/// Wraps \c mysql_fetch_row() in MySQL C API.
	Row fetch_row(ResultBase& res, ResultBase::Impl& impl);

	/// \brief Returns the lengths of the fields in the current row
	///
	/// Wraps \c mysql_fetch_lengths() in MySQL C API.
	const unsigned long* fetch_lengths(ResultBase::Impl& impl) const
	{
		return mysql_fetch_lengths(MYSQL_RES_FROM_IMPL(impl));








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		return !mysql_real_query(&mysql_, qstr,
				static_cast<unsigned long>(length));
	}

	/// \brief Returns the next DB row from the given result set.
	///
	/// Wraps \c mysql_fetch_row() in MySQL C API.
	Row fetch_row(ResultBase& res);

	/// \brief Returns the lengths of the fields in the current row
	///
	/// Wraps \c mysql_fetch_lengths() in MySQL C API.
	const unsigned long* fetch_lengths(ResultBase::Impl& impl) const
	{
		return mysql_fetch_lengths(MYSQL_RES_FROM_IMPL(impl));

Changes to src/result.cpp. 

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}


StoreQueryResult::StoreQueryResult(Impl* res, size_t rows,
		DBDriver* dbd, bool te) :
ResultBase(res, dbd, te),
list_type(rows),

copacetic_(true)
{
	if (copacetic_) {
		iterator it = begin();
		while (Row row = dbd->fetch_row(*this, *res)) *it++ = row;
	}
}


StoreQueryResult&
StoreQueryResult::copy(const StoreQueryResult& other)
{
................................................................................
			throw UseQueryError("Results not fetched");
		}
		else {
			return Row();
		}
	}

	if (Row row = driver_->fetch_row(*this, impl())) {
		const unsigned long* lengths = fetch_lengths();
		if (lengths) {
			return row;
		}
		else {
			if (throw_exceptions()) {
				throw UseQueryError("Failed to get field lengths");








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}


StoreQueryResult::StoreQueryResult(Impl* res, size_t rows,
		DBDriver* dbd, bool te) :
ResultBase(res, dbd, te),
list_type(rows),
pimpl_(res),
copacetic_(true)
{
	if (copacetic_) {
		iterator it = begin();
		while (Row row = dbd->fetch_row(*this)) *it++ = row;
	}
}


StoreQueryResult&
StoreQueryResult::copy(const StoreQueryResult& other)
{
................................................................................
			throw UseQueryError("Results not fetched");
		}
		else {
			return Row();
		}
	}

	if (Row row = driver_->fetch_row(*this)) {
		const unsigned long* lengths = fetch_lengths();
		if (lengths) {
			return row;
		}
		else {
			if (throw_exceptions()) {
				throw UseQueryError("Failed to get field lengths");

Changes to src/result.h. 

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	const FieldTypes::value_type& field_type(int i) const
			{ return types_->at(i); }

	/// \brief Get a list of the types of the fields within this
	/// result set.
	const RefCountedPointer<FieldTypes>& field_types() const
			{ return types_; }







	/// \brief Returns a pointer to the DBDriver subclass that created
	/// this object.
	DBDriver* driver() const { return driver_; }

	/// \brief Returns the number of fields in this result set
	size_t num_fields() const { return fields_.size(); }
................................................................................
	}
	
	/// \brief Fully initialize object
	StoreQueryResult(Impl* pri, size_t rows, DBDriver* dbd, bool te);

	/// \brief Destroy result set
	~StoreQueryResult() { }







	/// \brief Returns the number of rows in this result set
	list_type::size_type num_rows() const { return size(); }

	/// \brief Copy another StoreQueryResult object's data into this
	/// object
	StoreQueryResult& operator =(const StoreQueryResult& rhs)
................................................................................
	}

private:
	/// \brief Copy another StoreQueryResult object's contents into this
	/// one.
	StoreQueryResult& copy(const StoreQueryResult& other);


	bool copacetic_;	///< true if initialized from a good result set
};


/// \brief Result set type for "use" queries
///
/// See the user manual for the reason you might want to use this even
/// though its interface is less friendly than StoreQueryResult's.








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	const FieldTypes::value_type& field_type(int i) const
			{ return types_->at(i); }

	/// \brief Get a list of the types of the fields within this
	/// result set.
	const RefCountedPointer<FieldTypes>& field_types() const
			{ return types_; }

	/// \brief Access the driver-level implementation result set info
	///
	/// This is primarily for the benefit of the DBDriver subclass,
	/// not end-user code.
	virtual Impl& impl() const = 0;

	/// \brief Returns a pointer to the DBDriver subclass that created
	/// this object.
	DBDriver* driver() const { return driver_; }

	/// \brief Returns the number of fields in this result set
	size_t num_fields() const { return fields_.size(); }
................................................................................
	}
	
	/// \brief Fully initialize object
	StoreQueryResult(Impl* pri, size_t rows, DBDriver* dbd, bool te);

	/// \brief Destroy result set
	~StoreQueryResult() { }

	/// \brief Access the driver-level implementation result set info
	///
	/// This is primarily for the benefit of the DBDriver subclass,
	/// not end-user code.
	Impl& impl() const { return *pimpl_; }

	/// \brief Returns the number of rows in this result set
	list_type::size_type num_rows() const { return size(); }

	/// \brief Copy another StoreQueryResult object's data into this
	/// object
	StoreQueryResult& operator =(const StoreQueryResult& rhs)
................................................................................
	}

private:
	/// \brief Copy another StoreQueryResult object's contents into this
	/// one.
	StoreQueryResult& copy(const StoreQueryResult& other);

	RefCountedPointer<Impl> pimpl_;	///< Driver-level result set info
	bool copacetic_;				///< true if initialized from good result
};


/// \brief Result set type for "use" queries
///
/// See the user manual for the reason you might want to use this even
/// though its interface is less friendly than StoreQueryResult's.

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