SQL:
SELECT Name, Birthday, Birthplace, ID
FROM tPersons
WHERE
Age > 30
AND
Name LIKE 'Алекс%'

DFD:
	SqlBatch batch;
	batch.addSource("tPersons");
	
	batch	<< SqlField("Name", fv_visible, fr_none, "Имя", 100)
			<< SqlField("Birthday", fv_visible, fr_none, "Дата рождения", 80)
			<< SqlField("Birthplace", fv_visible, fr_none, "Место рождения", 120)
			<< SqlField("ID", fv_invisible, fr_id)
			
			<< SqlField("Age", SqlValue(30, fo_greater), fp_where)
			<< SqlField("Name", SqlValue("Алекс", fo_like, fb_right), fp_where);

SqlGen gen;
QString query = gen.query(batch, sql_select);

#include "abstractmodelhandler.h"

using namespace Sql;

const QString GLOBAL_PARAMETERS_SOURCE = "ParamS";

const int GLOBAL_PARAMETERS = 3335;

const int GLOBAL_PARAMETER_CLOSE_PROC = 41;

class h_GlobalParametersHandler : public AbstractModelHandler
{
public:
    h_GlobalParametersHandler();

	bool updateParameter(const SqlValue &oldId,
						 const SqlValue &name,
						 const SqlValue &stringValue,
						 const SqlValue &intValue,
						 const SqlValue &floatValue,
						 const SqlValue &description,
						 const SqlValue &dateBegin,
						 const SqlValue &dateEnd);

private:

	virtual SqlQueryDescriptor _selector(const SqlQueryModelTypes &modelType = mt_plain,
										 const int &queryNumber = 0) const;
	virtual SqlQueryDescriptor _inserter(const int &queryNumber = 0) const;
	virtual SqlQueryDescriptor _updater(const int &queryNumber = 0) const;
	virtual SqlQueryDescriptor _deleter(const int &queryNumber = 0) const;
	virtual SqlQueryDescriptor _executor(const int &queryNumber = 0) const;
};
[code]
И определение класса:
[code]
bool h_GlobalParametersHandler::updateParameter(const SqlValue &oldId,
												const SqlValue &name,
												const SqlValue &stringValue,
												const SqlValue &intValue,
												const SqlValue &floatValue,
												const SqlValue &description,
												const SqlValue dateBegin,
												const SqlValue dateEnd)
{
	h_GlobalParametersHandler th;
	th.setValue(ID_VALUE, oldId);
	th.setValue("DateAfter", dateBegin);
	bool res = th.Exec(GLOBAL_PARAMETER_CLOSE_PROC);
	Q_ASSERT(res);

	th.clearValues();
	th.setValue("Name", name);
	th.setValue("StringValue", stringValue);
	th.setValue("IntValue", intValue);
	th.setValue("FloatValue", floatValue);
	th.setValue("Description", description);
	th.setValue("DateBegin", dateBegin);
	th.setValue("DateEnd", dateEnd);
	res = th.Insert();

	return res;
}

SqlQueryDescriptor h_GlobalParametersHandler::_selector(const SqlQueryModelTypes &modelType,
									 const int &queryNumber) const
{
	SqlBatch batch;

	batch.addSource("vGlobalParams");

	if (queryNumber == GLOBAL_PARAMETERS)
	{
		batch	<< SqlField("ID", fv_invisible, fr_id)
				<< SqlField("Name", fv_visible, fr_none, "Название", 100)
				<< SqlField("StringValue", fv_visible, fr_none, "Строка", 120)
				<< SqlField("IntValue", fv_visible, fr_none, "Целое", 50)
				<< SqlField("FloatValue", fv_visible, fr_none, "Действит.", 70)
				<< SqlField("Description", fv_visible, fr_none, "Описание", 120)
				<< SqlField("vcDateBegin", fv_visible, fr_none, "Начало действия", 100)
				<< SqlField("vcDateEnd", fv_visible, fr_none, "Конец действия", 100)
				<< SqlField("vcIsUsed", fv_visible, fr_none, "Актив.?", 60)

				<< SqlField("DateBegin", fv_invisible)
				<< SqlField("DateEnd", fv_invisible)

				<< SqlField("ID", value(ID_VALUE), fp_where)

				<< SqlField("Name", value("Name"), fp_where)
				<< SqlField("IsUsed", value("IsUsed"), fp_where)
				<< SqlField("DateBegin", value("DateBegin"), fp_where)
				<< SqlField("DateEnd", value("DateEnd"), fp_where);
	}
	else
	if (queryNumber == LAST_ID)
	{
		batch << SqlField(MAX_ID, fv_visible, fr_none);
	}
	else
	{
		Q_ASSERT(false);
	}

	return SqlQueryDescriptor(batch, sql_select, queryNumber);
}

SqlQueryDescriptor h_GlobalParametersHandler::_inserter(const int &queryNumber) const
{
	SqlBatch batch;

	batch.addSource("tGlobalParams");

	batch	<< SqlField("Name", value("Name"), fp_insert)
			<< SqlField("StringValue", value("StringValue"), fp_insert)
			<< SqlField("IntValue", value("IntValue"), fp_insert)
			<< SqlField("FloatValue", value("FloatValue"), fp_insert)
			<< SqlField("Description", value("Description"), fp_insert)
			<< SqlField("DateBegin", value("DateBegin"), fp_insert)
			<< SqlField("DateEnd", value("DateEnd"), fp_insert);

	return SqlQueryDescriptor(batch, sql_insert, queryNumber);
}

SqlQueryDescriptor h_GlobalParametersHandler::_updater(const int &queryNumber) const
{
	SqlBatch batch;

	batch.addSource("tGlobalParams");

	batch	<< SqlField("Name", value("Name"), fp_update)
			<< SqlField("StringValue", value("StringValue"), fp_update)
			<< SqlField("IntValue", value("IntValue"), fp_update)
			<< SqlField("FloatValue", value("FloatValue"), fp_update)
			<< SqlField("Description", value("Description"), fp_update)
			<< SqlField("DateBegin", value("DateBegin"), fp_update)
			<< SqlField("DateEnd", value("DateEnd"), fp_update)

			<< SqlField("ID", value(ID_VALUE, SqlValue(nt_null)), fp_where);

	return SqlQueryDescriptor(batch, sql_update, queryNumber);
}

SqlQueryDescriptor h_GlobalParametersHandler::_deleter(const int &queryNumber) const
{
	SqlBatch batch;

	batch.addSource("tGlobalParams");

		batch	<< SqlField("ID", value(ID_VALUE, SqlValue(nt_null)), fp_where);

	return SqlQueryDescriptor(batch, sql_delete, queryNumber);
}

SqlQueryDescriptor h_GlobalParametersHandler::_executor(const int &queryNumber) const
{
	SqlBatch batch;

	if (queryNumber == GLOBAL_PARAMETER_CLOSE_PROC)
	{
		batch.addSource("pCloseGlobalParameter");
		batch	<< SqlValue(value(ID_VALUE, SqlValue(nt_null)))
				<< SqlValue(value("DateAfter"));
	}
	else
	{
		Q_ASSERT(false);
	}

	return SqlQueryDescriptor(batch, sql_execute, queryNumber);
}

h_GlobalParametersHandler	_handler
SqlQueryModel			_model;

void f_GlobalParametersForm::loadParameters()
{
// Загружаем источник данных. Берем select-запрос из h_GlobalParametersHandler::_selector() с номером GLOBAL_PARAMETERS.
	_handler.reloadSource(GLOBAL_PARAMETERS_SOURCE, GLOBAL_PARAMETERS, &_model);
// Настраиваем tableView на источник данных. Названия колонок, их ширина, ориентация, - все берется из описателя DFD, сформированного функцией _selector с номером запроса GLOBAL_PARAMETERS и типом модели mt_plain (если бы использовался TreeView, тип модели был бы mt_tree).
	_handler.setTableView(GLOBAL_PARAMETERS_SOURCE, ui->tv_Parameters);
}

SqlValue f_GlobalParametersForm::parameterID() const
{
// Ключевое значение текущей строки во view.
	return _handler.keyValueOfView(GLOBAL_PARAMETERS_SOURCE);
}

// Удаление текущей строки во view из БД.
void f_GlobalParametersForm::deleteParameter()
{
	d_ConfirmDialog dlg;
	if (dlg.exec() == QDialog::Accepted)
	{
		_handler.DeleteCurrent(GLOBAL_PARAMETERS_SOURCE, ui->tv_Parameters);
		loadParameters();
	}
}