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authorMichael Shepanski <michael@codesynthesis.com>2014-11-04 16:10:03 +1100
committerBoris Kolpackov <boris@codesynthesis.com>2014-11-10 16:51:17 +0200
commit521596e38974a68a60dbc8eb083cc881bb11914f (patch)
tree0225cc3181291198b63042b0e8c26a4235cb5d05
parent5ccb8ff28beedd9288c077f0f7509a79a819929e (diff)
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).
-rw-r--r--odb/pgsql/database.hxx62
-rw-r--r--odb/pgsql/database.ixx120
2 files changed, 182 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>
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)
{