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Added method to set return type of custom query

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rbock
2014-11-09 16:26:36 +01:00
parent 548a601026
commit f6b223138b
4 changed files with 98 additions and 9 deletions
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28
tests/CustomQueryTest.cpp
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@@ -37,19 +37,31 @@ int main()
test::TabFoo f;
test::TabBar t;
auto c = custom_query(select(all_of(t)).from(t), into(f));
std::cerr << serialize(c, printer).str() << std::endl;
db(c);
auto p = db.prepare(custom_query(select(all_of(t)).from(t), where(t.alpha > sqlpp::parameter(t.alpha))));
p.params.alpha = 8;
// A void custom query
printer.reset();
auto x = custom_query(sqlpp::verbatim("PRAGMA writeable_schema = "), true);
std::cerr << serialize(x, printer).str() << std::endl;
db(x);
db.run_prepared_execute(db.prepare(x));
// Syntactically, it is possible to use this void query as a prepared statement, too, not sure, whether this makes sense very often...
db(db.prepare(x));
// A prepared custom select
// The return type of the custom query is determined from the first argument which does have a return type, in this case the select
auto p = db.prepare(custom_query(select(all_of(t)).from(t), where(t.alpha > sqlpp::parameter(t.alpha))));
p.params.alpha = 8;
for (const auto& row : db(p))
{
std::cerr << row.alpha << std::endl;
}
// A custom (select ... into) with adjusted return type
// The first argument with a return type is the select, but the custom query is really an insert. Thus, we tell it so.
printer.reset();
auto c = custom_query(select(all_of(t)).from(t), into(f)).with_result_type_of(insert_into(f));
std::cerr << serialize(c, printer).str() << std::endl;
auto i = db(c);
static_assert(std::is_integral<decltype(i)>::value, "insert yields an integral value");
return 0;
}