abstract_table.h

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   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef DD__ABSTRACT_TABLE_INCLUDED
#define DD__ABSTRACT_TABLE_INCLUDED
 
#include "my_inttypes.h"
#include "sql/dd/collection.h"           // dd::Collection
#include "sql/dd/object_id.h"            // dd::Object_id
#include "sql/dd/types/entity_object.h"  // dd::Entity_object
 
namespace dd {
 
///////////////////////////////////////////////////////////////////////////
 
class Abstract_table_impl;
class Column;
class Item_name_key;
class Primary_id_key;
class Properties;
class Se_private_id_key;
 
namespace tables {
class Tables;
}
 
///////////////////////////////////////////////////////////////////////////
 
/////////////////////////////////////////////////////////////////////////
// enum_table_type.
/////////////////////////////////////////////////////////////////////////
 
enum class enum_table_type {
  INVALID_TABLE,
  BASE_TABLE,
  USER_VIEW,
  SYSTEM_VIEW
};
 
/**
  Abstract base class for tables and views.
 
  @note This class may be inherited along different paths
        for some subclasses due to the diamond shaped
        inheritance hierarchy; thus, direct subclasses
        must inherit this class virtually.
*/
 
class Abstract_table : virtual public Entity_object {
 public:
  typedef Abstract_table_impl Impl;
  typedef Abstract_table Cache_partition;
  typedef tables::Tables DD_table;
  typedef Primary_id_key Id_key;
  typedef Item_name_key Name_key;
  typedef Se_private_id_key Aux_key;
  typedef Collection<Column *> Column_collection;
 
  // We need a set of functions to update a preallocated key.
  virtual bool update_id_key(Id_key *key) const {
    return update_id_key(key, id());
  }
 
  static bool update_id_key(Id_key *key, Object_id id);
 
  virtual bool update_name_key(Name_key *key) const {
    return update_name_key(key, schema_id(), name());
  }
 
  static bool update_name_key(Name_key *key, Object_id schema_id,
                              const String_type &name);
 
  virtual bool update_aux_key(Aux_key *) const { return true; }
 
 public:
  ~Abstract_table() override = default;
 
 public:
  /**
    Enumeration type which indicates whether the table is hidden,
    and if yes then which type of hidden table it is.
  */
  enum enum_hidden_type {
    /* Normal, user-visible table. */
    HT_VISIBLE = 1,
    /* Hidden. System (e.g. data-dictionary) table. */
    HT_HIDDEN_SYSTEM,
    /*
      Hidden. Table which is implicitly created and dropped by SE.
      For example, InnoDB's auxiliary table for FTS.
    */
    HT_HIDDEN_SE,
    /*
      Hidden. Temporary table created by ALTER TABLE implementation.
    */
    HT_HIDDEN_DDL
  };
 
  /////////////////////////////////////////////////////////////////////////
  // schema.
  /////////////////////////////////////////////////////////////////////////
 
  virtual Object_id schema_id() const = 0;
  virtual void set_schema_id(Object_id schema_id) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // mysql_version_id.
  /////////////////////////////////////////////////////////////////////////
 
  virtual uint mysql_version_id() const = 0;
  // virtual void set_mysql_version_id(uint mysql_version_id) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // options.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const Properties &options() const = 0;
  virtual Properties &options() = 0;
  virtual bool set_options(const Properties &options) = 0;
  virtual bool set_options(const String_type &options_raw) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // created.
  /////////////////////////////////////////////////////////////////////////
 
  virtual ulonglong created(bool convert_time) const = 0;
  virtual void set_created(ulonglong created) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // last altered.
  /////////////////////////////////////////////////////////////////////////
 
  virtual ulonglong last_altered(bool convert_time) const = 0;
  virtual void set_last_altered(ulonglong last_altered) = 0;
 
  virtual enum_table_type type() const = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // hidden.
  /////////////////////////////////////////////////////////////////////////
 
  virtual enum_hidden_type hidden() const = 0;
  virtual void set_hidden(enum_hidden_type hidden) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // Column collection.
  /////////////////////////////////////////////////////////////////////////
 
  virtual Column *add_column() = 0;
  virtual bool drop_column(const String_type &name) = 0;
 
  virtual const Column_collection &columns() const = 0;
 
  virtual Column_collection *columns() = 0;
 
  virtual const Column *get_column(const String_type &name) const = 0;
 
  /**
    Allocate a new object graph and invoke the copy constructor for
    each object.
 
    @return pointer to dynamically allocated copy
  */
  virtual Abstract_table *clone() const = 0;
 
  /**
    Allocate a new object which can serve as a placeholder for the original
    object in the Dictionary_client's dropped registry. Such object has the
    same keys as the original but has no other info and as result occupies
    less memory.
  */
  virtual Abstract_table *clone_dropped_object_placeholder() const = 0;
};
 
///////////////////////////////////////////////////////////////////////////
}  // namespace dd
 
#endif  // DD__ABSTRACT_TABLE_INCLUDED