tomasz.sowa/morm
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add support for declared cursors

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Declare a cursor with the Finder::declare_cursor() method and next get the cursor with get_cursor():
morm::Cursor<MyObject> cursor = finder.
  declare_cursor("mycursorname").
  select().
  raw("ORDER BY column_name ASC").
  get_cursor();

The cursor now can be used with fetch.*() methods and then get() or get_list():
MyObject myobject = cursor.fetch_next().get();
std::list<MyObject> myobjects = cursor.fetch_forward_count(10).get_list();
This commit is contained in:
Tomasz Sowa
2023-07-16 04:03:03 +02:00
parent 6619f3ecb5
commit 21f12a8a98
8 changed files with 448 additions and 80 deletions
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11
src/dbexpression.h
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@@ -78,6 +78,17 @@ public:
virtual void generate_rows_counter_column_name(ModelEnv & model_env, pt::TextStream & str);
virtual void prepare_declare_cursor_query(const pt::TextStream & cursor_name, bool scroll_cursor, pt::TextStream & out_stream);
virtual void prepare_fetch_next_query(const pt::TextStream & cursor_name, pt::TextStream & out_stream);
virtual void prepare_fetch_prior_query(const pt::TextStream & cursor_name, pt::TextStream & out_stream);
virtual void prepare_fetch_first_query(const pt::TextStream & cursor_name, pt::TextStream & out_stream);
virtual void prepare_fetch_last_query(const pt::TextStream & cursor_name, pt::TextStream & out_stream);
virtual void prepare_fetch_absotule_query(const pt::TextStream & cursor_name, long position, pt::TextStream & out_stream);
virtual void prepare_fetch_relative_query(const pt::TextStream & cursor_name, long position, pt::TextStream & out_stream);
virtual void prepare_fetch_forward_count_query(const pt::TextStream & cursor_name, size_t len, pt::TextStream & out_stream);
virtual void prepare_fetch_backward_count_query(const pt::TextStream & cursor_name, size_t len, pt::TextStream & out_stream);
virtual void prepare_fetch_all_query(const pt::TextStream & cursor_name, pt::TextStream & out_stream);
protected: