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, 62 insertions, 0 deletions

diff --git a/odb/pgsql/database.hxx b/odb/pgsql/database.hxx
index 2a70e96..dda8d31 100644
--- a/odb/pgsql/database.hxx
+++ b/odb/pgsql/database.hxx
@@ -288,6 +288,68 @@ namespace odb
       result<T>
       query (const odb::query_base&);
 
+      // Query one API.
+      //
+      template <typename T>
+      typename object_traits<T>::pointer_type
+      query_one ();
+
+      template <typename T>
+      bool
+      query_one (T& object);
+
+      template <typename T>
+      T
+      query_value ();
+
+      template <typename T>
+      typename object_traits<T>::pointer_type
+      query_one (const char*);
+
+      template <typename T>
+      bool
+      query_one (const char*, T& object);
+
+      template <typename T>
+      T
+      query_value (const char*);
+
+      template <typename T>
+      typename object_traits<T>::pointer_type
+      query_one (const std::string&);
+
+      template <typename T>
+      bool
+      query_one (const std::string&, T& object);
+
+      template <typename T>
+      T
+      query_value (const std::string&);
+
+      template <typename T>
+      typename object_traits<T>::pointer_type
+      query_one (const pgsql::query_base&);
+
+      template <typename T>
+      bool
+      query_one (const pgsql::query_base&, T& object);
+
+      template <typename T>
+      T
+      query_value (const pgsql::query_base&);
+
+      template <typename T>
+      typename object_traits<T>::pointer_type
+      query_one (const odb::query_base&);
+
+      template <typename T>
+      bool
+      query_one (const odb::query_base&, T& object);
+
+      template <typename T>
+      T
+      query_value (const odb::query_base&);
+
       // Query preparation.
       //
       template <typename T>