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// file : mapping/traits-sqlite.hxx
// copyright : not copyrighted - public domain
#ifndef TRAITS_SQLITE_HXX
#define TRAITS_SQLITE_HXX
//
// SQLite implementation.
//
#include <cstddef> // std::size_t
#include <cstring> // std::strncmp, std::memcpy
#include <sstream>
#include <odb/sqlite/traits.hxx>
#include "person.hxx" // date
namespace odb
{
namespace sqlite
{
template <>
class value_traits<bool, id_text>
{
public:
typedef bool value_type;
typedef bool query_type;
typedef details::buffer image_type;
static void
set_value (bool& v,
const details::buffer& b,
std::size_t n,
bool is_null)
{
v = (!is_null && n == 4 && std::strncmp ("true", b.data (), n) == 0);
}
static void
set_image (details::buffer& b,
std::size_t& n,
bool& is_null,
bool v)
{
is_null = false;
n = v ? 4 : 5;
if (n > b.capacity ())
b.capacity (n);
std::memcpy (b.data (), (v ? "true" : "false"), n);
}
};
// In SQLite there is no built-in DATE type. Rather, this type is
// mapped to TEXT in the YYYY-MM-DD format. The below implementation
// doesn't do any error checking for brevity.
//
template <>
class value_traits<date, id_text>
{
public:
typedef date value_type;
typedef date query_type;
typedef details::buffer image_type;
static void
set_value (date& v,
const details::buffer& b,
std::size_t n,
bool is_null)
{
using namespace std;
if (!is_null)
{
istringstream is (string (b.data (), n));
unsigned int y, m, d;
is >> y;
is.ignore (1);
is >> m;
is.ignore (1);
is >> d;
v = date (y, m, d);
}
else
v = date (0, 0, 0);
}
static void
set_image (details::buffer& b,
std::size_t& n,
bool& is_null,
const date& v)
{
using namespace std;
ostringstream os;
os.fill ('0');
os.width (4);
os << v.year () << '-';
os.width (2);
os << v.month () << '-';
os.width (2);
os << v.day ();
const string& s (os.str ());
is_null = false;
n = s.size ();
if (n > b.capacity ())
b.capacity (n);
memcpy (b.data (), s.c_str (), n);
}
};
}
}
#endif // TRAITS_SQLITE_HXX
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