From 534da0d899b11f6ca1fac161ea8901a62e5c07dc Mon Sep 17 00:00:00 2001 From: Boris Kolpackov Date: Wed, 14 Aug 2013 15:16:09 +0200 Subject: Add support for object sections Sections are an optimization mechanism that allows the partitioning of data members of a persistent class into groups that can be separately loaded and/or updated. --- odb/sqlite/simple-object-statements.hxx | 100 ++++++++++++++++++-------------- 1 file changed, 56 insertions(+), 44 deletions(-) (limited to 'odb/sqlite/simple-object-statements.hxx') diff --git a/odb/sqlite/simple-object-statements.hxx b/odb/sqlite/simple-object-statements.hxx index 2c5b321..a1e7678 100644 --- a/odb/sqlite/simple-object-statements.hxx +++ b/odb/sqlite/simple-object-statements.hxx @@ -29,58 +29,59 @@ namespace odb { namespace sqlite { - // The container_statement_cache class is only defined (and used) in + // The extra_statement_cache class is only defined (and used) in // the generated source file. However, object_statements may be // referenced from another source file in the case of a polymorphic - // hierarchy (though in this case the container statement cache is + // hierarchy (though in this case the extra statement cache is // not used). As a result, we cannot have a by-value member and // instead will store a pointer and lazily allocate the cache if // and when needed. We will also need to store a pointer to the // deleter function which will be initialized during allocation // (at that point we know that the cache class is defined). // - template - struct container_statement_cache_ptr + template + struct extra_statement_cache_ptr { + typedef I image_type; typedef sqlite::connection connection_type; - container_statement_cache_ptr (): p_ (0) {} - ~container_statement_cache_ptr () + extra_statement_cache_ptr (): p_ (0) {} + ~extra_statement_cache_ptr () { if (p_ != 0) - (this->*deleter_) (0, 0); + (this->*deleter_) (0, 0, 0, 0); } T& - get (connection_type& c, binding& id) + get (connection_type& c, image_type& im, binding& id, binding* idv) { if (p_ == 0) - allocate (&c, &id); + allocate (&c, &im, &id, (idv != 0 ? idv : &id)); return *p_; } private: void - allocate (connection_type*, binding*); + allocate (connection_type*, image_type*, binding*, binding*); private: T* p_; - void (container_statement_cache_ptr::*deleter_) ( - connection_type*, binding*); + void (extra_statement_cache_ptr::*deleter_) ( + connection_type*, image_type*, binding*, binding*); }; - template - void container_statement_cache_ptr:: - allocate (connection_type* c, binding* id) + template + void extra_statement_cache_ptr:: + allocate (connection_type* c, image_type* im, binding* id, binding* idv) { // To reduce object code size, this function acts as both allocator // and deleter. // if (p_ == 0) { - p_ = new T (*c, *id); - deleter_ = &container_statement_cache_ptr::allocate; + p_ = new T (*c, *im, *id, *idv); + deleter_ = &extra_statement_cache_ptr::allocate; } else delete p_; @@ -156,9 +157,11 @@ namespace odb optimistic_data (bind*); + binding* + id_image_binding () {return &id_image_binding_;} + // The id + optimistic column binding. // - std::size_t id_image_version_; binding id_image_binding_; details::shared_ptr erase_; @@ -168,6 +171,9 @@ namespace odb struct optimistic_data { optimistic_data (bind*) {} + + binding* + id_image_binding () {return 0;} }; template @@ -186,8 +192,8 @@ namespace odb pointer_cache_traits; typedef - typename object_traits::container_statement_cache_type - container_statement_cache_type; + typename object_traits::extra_statement_cache_type + extra_statement_cache_type; typedef sqlite::insert_statement insert_statement_type; typedef sqlite::select_statement select_statement_type; @@ -327,14 +333,10 @@ namespace odb binding& id_image_binding () {return id_image_binding_;} - // Optimistic id + managed column image binding. + // Optimistic id + managed column image binding. It points to + // the same suffix as id binding and they are always updated + // at the same time. // - std::size_t - optimistic_id_image_version () const {return od_.id_image_version_;} - - void - optimistic_id_image_version (std::size_t v) {od_.id_image_version_ = v;} - binding& optimistic_id_image_binding () {return od_.id_image_binding_;} @@ -416,35 +418,42 @@ namespace odb return *od_.erase_; } - // Container statement cache. + // Extra (container, section) statement cache. // - container_statement_cache_type& - container_statment_cache () + extra_statement_cache_type& + extra_statement_cache () { - return container_statement_cache_.get (conn_, id_image_binding_); + return extra_statement_cache_.get ( + conn_, image_, id_image_binding_, od_.id_image_binding ()); } public: - // select = total + // select = total - separate_load // insert = total - inverse - managed_optimistic // update = total - inverse - managed_optimistic - id - readonly + // - separate_update // - static const std::size_t select_column_count = - object_traits::column_count; - - static const std::size_t insert_column_count = - object_traits::column_count - object_traits::inverse_column_count - - object_traits::managed_optimistic_column_count; - - static const std::size_t update_column_count = insert_column_count - - object_traits::id_column_count - object_traits::readonly_column_count; - static const std::size_t id_column_count = object_traits::id_column_count; static const std::size_t managed_optimistic_column_count = object_traits::managed_optimistic_column_count; + static const std::size_t select_column_count = + object_traits::column_count - + object_traits::separate_load_column_count; + + static const std::size_t insert_column_count = + object_traits::column_count - + object_traits::inverse_column_count - + object_traits::managed_optimistic_column_count; + + static const std::size_t update_column_count = + insert_column_count - + id_column_count - + object_traits::readonly_column_count - + object_traits::separate_update_column_count; + private: object_statements (const object_statements&); object_statements& operator= (const object_statements&); @@ -457,8 +466,11 @@ namespace odb clear_delayed_ (); private: - container_statement_cache_ptr - container_statement_cache_; + template + friend class polymorphic_derived_object_statements; + + extra_statement_cache_ptr + extra_statement_cache_; image_type image_; -- cgit v1.1