Implement {query,execute}_{one,value}() shortcut functions

Useful in situations where the query is know to return at most one element
(*_one) or exactly one element (*_value).

1 files changed, 120 insertions, 0 deletions

diff --git a/odb/pgsql/database.ixx b/odb/pgsql/database.ixx
index 809e4d4..21b5729 100644
--- a/odb/pgsql/database.ixx
+++ b/odb/pgsql/database.ixx
@@ -429,6 +429,126 @@ namespace odb
     }
 
     template <typename T>
+    inline typename object_traits<T>::pointer_type database::
+    query_one ()
+    {
+      return query_one<T> (pgsql::query_base ());
+    }
+
+    template <typename T>
+    inline bool database::
+    query_one (T& o)
+    {
+      return query_one<T> (pgsql::query_base (), o);
+    }
+
+    template <typename T>
+    inline T database::
+    query_value ()
+    {
+      return query_value<T> (pgsql::query_base ());
+    }
+
+    template <typename T>
+    inline typename object_traits<T>::pointer_type database::
+    query_one (const char* q)
+    {
+      return query_one<T> (pgsql::query_base (q));
+    }
+
+    template <typename T>
+    inline bool database::
+    query_one (const char* q, T& o)
+    {
+      return query_one<T> (pgsql::query_base (q), o);
+    }
+
+    template <typename T>
+    inline T database::
+    query_value (const char* q)
+    {
+      return query_value<T> (pgsql::query_base (q));
+    }
+
+    template <typename T>
+    inline typename object_traits<T>::pointer_type database::
+    query_one (const std::string& q)
+    {
+      return query_one<T> (pgsql::query_base (q));
+    }
+
+    template <typename T>
+    inline bool database::
+    query_one (const std::string& q, T& o)
+    {
+      return query_one<T> (pgsql::query_base (q), o);
+    }
+
+    template <typename T>
+    inline T database::
+    query_value (const std::string& q)
+    {
+      return query_value<T> (pgsql::query_base (q));
+    }
+
+    template <typename T>
+    inline typename object_traits<T>::pointer_type database::
+    query_one (const pgsql::query_base& q)
+    {
+      // T is always object_type. We also don't need to check for transaction
+      // here; object_traits::query () does this.
+      //
+      return query_one_<T, id_pgsql> (q);
+    }
+
+    template <typename T>
+    inline bool database::
+    query_one (const pgsql::query_base& q, T& o)
+    {
+      // T is always object_type. We also don't need to check for transaction
+      // here; object_traits::query () does this.
+      //
+      return query_one_<T, id_pgsql> (q, o);
+    }
+
+    template <typename T>
+    inline T database::
+    query_value (const pgsql::query_base& q)
+    {
+      // T is always object_type. We also don't need to check for transaction
+      // here; object_traits::query () does this.
+      //
+      return query_value_<T, id_pgsql> (q);
+    }
+
+    template <typename T>
+    inline typename object_traits<T>::pointer_type database::
+    query_one (const odb::query_base& q)
+    {
+      // Translate to native query.
+      //
+      return query_one<T> (pgsql::query_base (q));
+    }
+
+    template <typename T>
+    inline bool database::
+    query_one (const odb::query_base& q, T& o)
+    {
+      // Translate to native query.
+      //
+      return query_one<T> (pgsql::query_base (q), o);
+    }
+
+    template <typename T>
+    inline T database::
+    query_value (const odb::query_base& q)
+    {
+      // Translate to native query.
+      //
+      return query_value<T> (pgsql::query_base (q));
+    }
+
+    template <typename T>
     inline prepared_query<T> database::
     prepare_query (const char* n, const char* q)
     {