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Add example for MYSQL's ON DUPLICATE KEY UPDATE

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rbock
2018-12-24 17:32:16 +01:00
parent dd73319bcf
commit 7e2e1abbfc
1 changed files with 33 additions and 1 deletions
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34
tests/CustomQuery.cpp
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@@ -29,7 +29,35 @@
#include <sqlpp11/sqlpp11.h>
#include <sqlpp11/custom_query.h>
int CustomQuery(int, char* [])
namespace
{
struct on_duplicate_key_update
{
std::string _serialized;
template <typename Db, typename Assignment>
on_duplicate_key_update(Db&, Assignment assignment)
{
typename Db::_serializer_context_t context;
_serialized = " ON DUPLICATE KEY UPDATE " + serialize(assignment, context).str();
}
template <typename Db, typename Assignment>
auto operator()(Db&, Assignment assignment) -> on_duplicate_key_update&
{
typename Db::_serializer_context_t context;
_serialized += ", " + serialize(assignment, context).str();
return *this;
}
auto get() const -> sqlpp::verbatim_t<::sqlpp::no_value_t>
{
return ::sqlpp::verbatim(_serialized);
}
};
} // namespace
int CustomQuery(int, char*[])
{
MockDb db = {};
MockDb::_serializer_context_t printer = {};
@@ -61,6 +89,10 @@ int CustomQuery(int, char* [])
db(custom_query(sqlpp::insert(), sqlpp::verbatim(" OR IGNORE"), into(t),
insert_set(t.beta = "sample", t.gamma = true)));
// Create a MYSQL style custom "insert on duplicate update"
db(custom_query(sqlpp::insert_into(t).set(t.beta = "sample", t.gamma = true),
on_duplicate_key_update(db, t.beta = "sample")(db, t.gamma = false).get()));
// 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();