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//
// Binding.cpp
//
// $Id: //poco/Main/Data/samples/TypeHandler/src/TypeHandler.cpp#3 $
//
// This sample demonstrates the Data library.
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
#include "Poco/SharedPtr.h"
#include "Poco/DateTimeFormatter.h"
#include "Poco/Data/SessionFactory.h"
#include "Poco/Data/Session.h"
#include "Poco/Data/TypeHandler.h"
#include "Poco/Data/SQLite/Connector.h"
#include <vector>
#include <iostream>
using namespace Poco::Data::Keywords;
using Poco::DateTime;
using Poco::DateTimeFormatter;
using Poco::Data::Session;
using Poco::Data::Statement;
struct Person
{
std::string name;
std::string address;
int age;
DateTime birthday;
};
namespace Poco {
namespace Data {
template <>
class TypeHandler<Person>
/// Defining a specialization of TypeHandler for Person allows us
/// to use the Person struct in use and into clauses.
{
public:
static std::size_t size()
{
return 3;
}
static void bind(std::size_t pos, const Person& person, AbstractBinder::Ptr pBinder, AbstractBinder::Direction dir)
{
TypeHandler<std::string>::bind(pos++, person.name, pBinder, dir);
TypeHandler<std::string>::bind(pos++, person.address, pBinder, dir);
TypeHandler<int>::bind(pos++, person.age, pBinder, dir);
TypeHandler<DateTime>::bind(pos++, person.birthday, pBinder, dir);
}
static void extract(std::size_t pos, Person& person, const Person& deflt, AbstractExtractor::Ptr pExtr)
{
TypeHandler<std::string>::extract(pos++, person.name, deflt.name, pExtr);
TypeHandler<std::string>::extract(pos++, person.address, deflt.address, pExtr);
TypeHandler<int>::extract(pos++, person.age, deflt.age, pExtr);
TypeHandler<DateTime>::extract(pos++, person.birthday, deflt.birthday, pExtr);
}
static void prepare(std::size_t pos, const Person& person, AbstractPreparator::Ptr pPrep)
{
TypeHandler<std::string>::prepare(pos++, person.name, pPrep);
TypeHandler<std::string>::prepare(pos++, person.address, pPrep);
TypeHandler<int>::prepare(pos++, person.age, pPrep);
TypeHandler<DateTime>::prepare(pos++, person.birthday, pPrep);
}
};
} } // namespace Poco::Data
int main(int argc, char** argv)
{
// create a session
Session session("SQLite", "sample.db");
// drop sample table, if it exists
session << "DROP TABLE IF EXISTS Person", now;
// (re)create table
session << "CREATE TABLE Person (Name VARCHAR(30), Address VARCHAR, Age INTEGER(3), Birthday DATE)", now;
// insert some rows
Person person =
{
"Bart Simpson",
"Springfield",
10,
DateTime(1980, 4, 1)
};
Statement insert(session);
insert << "INSERT INTO Person VALUES(?, ?, ?, ?)",
use(person);
insert.execute();
person.name = "Lisa Simpson";
person.address = "Springfield";
person.age = 8;
person.birthday = DateTime(1982, 5, 9);
insert.execute();
// a simple query
Statement select(session);
select << "SELECT Name, Address, Age, Birthday FROM Person",
into(person),
range(0, 1); // iterate over result set one row at a time
while (!select.done())
{
select.execute();
std::cout << person.name << "\t"
<< person.address << "\t"
<< person.age << "\t"
<< DateTimeFormatter::format(person.birthday, "%b %d %Y")
<< std::endl;
}
// another query - store the result in a container
std::vector<Person> persons;
session << "SELECT Name, Address, Age, Birthday FROM Person",
into(persons),
now;
for (std::vector<Person>::const_iterator it = persons.begin(); it != persons.end(); ++it)
{
std::cout << it->name << "\t"
<< it->address << "\t"
<< it->age << "\t"
<< DateTimeFormatter::format(it->birthday, "%b %d %Y")
<< std::endl;
}
return 0;
}