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#pragma once
#include <database/query.hpp>
#include <logger/logger.hpp>
#include <database/row.hpp>
#include <vector>
#include <string>
#include <sqlite3.h>
using namespace std::string_literals;
template <typename T>
typename std::enable_if<std::is_integral<T>::value, sqlite3_int64>::type
extract_row_value(sqlite3_stmt* statement, const int i)
{
return sqlite3_column_int64(statement, i);
}
template <typename T>
typename std::enable_if<std::is_same<std::string, T>::value, std::string>::type
extract_row_value(sqlite3_stmt* statement, const int i)
{
const auto size = sqlite3_column_bytes(statement, i);
const unsigned char* str = sqlite3_column_text(statement, i);
std::string result(reinterpret_cast<const char*>(str), size);
return result;
}
template <std::size_t N=0, typename... T>
typename std::enable_if<N < sizeof...(T), void>::type
extract_row_values(Row<T...>& row, sqlite3_stmt* statement)
{
using ColumnType = typename std::remove_reference<decltype(std::get<N>(row.columns))>::type;
auto&& column = std::get<N>(row.columns);
column.value = static_cast<decltype(column.value)>(extract_row_value<typename ColumnType::real_type>(statement, N));
extract_row_values<N+1>(row, statement);
}
template <std::size_t N=0, typename... T>
typename std::enable_if<N == sizeof...(T), void>::type
extract_row_values(Row<T...>&, sqlite3_stmt*)
{}
template <typename... T>
struct SelectQuery: public Query
{
SelectQuery(std::string table_name):
Query("SELECT"),
table_name(table_name)
{
this->insert_col_name<0>();
this->body += " from " + this->table_name;
}
template <std::size_t N>
typename std::enable_if<N < sizeof...(T), void>::type
insert_col_name()
{
using ColumnsType = std::tuple<T...>;
ColumnsType tuple{};
auto value = std::get<N>(tuple);
this->body += " "s + value.name;
if (N < (sizeof...(T) - 1))
this->body += ", ";
this->insert_col_name<N+1>();
}
template <std::size_t N>
typename std::enable_if<N == sizeof...(T), void>::type
insert_col_name()
{}
SelectQuery& where()
{
this->body += " WHERE ";
return *this;
};
SelectQuery& order_by()
{
this->body += " ORDER BY ";
return *this;
}
SelectQuery& limit()
{
this->body += " LIMIT ";
return *this;
}
auto execute(sqlite3* db)
{
auto statement = this->prepare(db);
int i = 1;
for (const std::string& param: this->params)
{
if (sqlite3_bind_text(statement, i, param.data(), static_cast<int>(param.size()), SQLITE_TRANSIENT) != SQLITE_OK)
log_debug("Failed to bind ", param, " to param ", i);
else
log_debug("Bound ", param, " to ", i);
i++;
}
std::vector<Row<T...>> rows;
while (sqlite3_step(statement) == SQLITE_ROW)
{
Row<T...> row(this->table_name);
extract_row_values(row, statement);
rows.push_back(row);
}
return rows;
}
const std::string table_name;
};
template <typename T, typename... ColumnTypes>
typename std::enable_if<!std::is_integral<T>::value, SelectQuery<ColumnTypes...>&>::type
operator<<(SelectQuery<ColumnTypes...>& query, const T&)
{
query.body += T::name;
return query;
}
template <typename... ColumnTypes>
SelectQuery<ColumnTypes...>& operator<<(SelectQuery<ColumnTypes...>& query, const char* str)
{
query.body += str;
return query;
}
template <typename... ColumnTypes>
SelectQuery<ColumnTypes...>& operator<<(SelectQuery<ColumnTypes...>& query, const std::string& str)
{
query.body += "?";
actual_add_param(query, str);
return query;
}
template <typename Integer, typename... ColumnTypes>
typename std::enable_if<std::is_integral<Integer>::value, SelectQuery<ColumnTypes...>&>::type
operator<<(SelectQuery<ColumnTypes...>& query, const Integer& i)
{
query.body += "?";
actual_add_param(query, i);
return query;
}
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