drivers.hpp

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// Andrew Naplavkov
 
#ifndef BOAT_SQL_ODBC_DRIVERS_HPP
#define BOAT_SQL_ODBC_DRIVERS_HPP
 
#include <boat/detail/unicode.hpp>
#if __has_include(<sql.h>)
#include <boat/sql/odbc/detail/utility.hpp>
#endif
#include <generator>
 
namespace boat::sql::odbc {
 
inline std::generator<std::string> drivers()
{
#if __has_include(<sql.h>)
    auto env = env_ptr{};
    env = alloc<SQL_HANDLE_ENV>(env);
    check(SQLSetEnvAttr(
              env.get(), SQL_ATTR_ODBC_VERSION, SQLPOINTER(SQL_OV_ODBC3), 0),
          env);
    std::array<SQLWCHAR, SQL_MAX_MESSAGE_LENGTH> desc, attr;
    SQLSMALLINT desc_len, attr_len;
    while (SQL_SUCCEEDED(SQLDriversW(  //
        env.get(),
        SQL_FETCH_NEXT,
        desc.data(),
        SQL_MAX_MESSAGE_LENGTH,
        &desc_len,
        attr.data(),
        SQL_MAX_MESSAGE_LENGTH,
        &attr_len)))
        co_yield std::span(desc.data(), desc_len) | unicode::utf8;
#else
    co_return;
#endif
}
 
}  // namespace boat::sql::odbc
 
#endif  // BOAT_SQL_ODBC_DRIVERS_HPP