check_constraint.h

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/* Copyright (c) 2019, 2025, Oracle and/or its affiliates.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   documentation.  The authors of MySQL hereby grant you an additional
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.
 
   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__CHECK_CONSTRAINTS_INCLUDED
#define DD__CHECK_CONSTRAINTS_INCLUDED
 
#include "sql/dd/types/entity_object.h"  // dd::Entity_object
 
namespace dd {
 
///////////////////////////////////////////////////////////////////////////
 
class Table;
class Check_constraint_impl;
 
namespace tables {
class Check_constraints;
}
 
///////////////////////////////////////////////////////////////////////////
 
class Check_constraint : virtual public Entity_object {
 public:
  typedef Check_constraint_impl Impl;
  typedef tables::Check_constraints DD_table;
 
 public:
  enum enum_constraint_state { CS_NOT_ENFORCED = 1, CS_ENFORCED };
 
 public:
  ~Check_constraint() override = default;
 
  /////////////////////////////////////////////////////////////////////////
  // State. (enforced / not enforced)
  /////////////////////////////////////////////////////////////////////////
 
  virtual enum_constraint_state constraint_state() const = 0;
  virtual void set_constraint_state(bool is_enforced) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // Check clause/utf8.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const String_type &check_clause() const = 0;
  virtual void set_check_clause(const String_type &check_clause) = 0;
 
  virtual const String_type &check_clause_utf8() const = 0;
  virtual void set_check_clause_utf8(const String_type &check_clause_utf8) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // Alter mode ( true / false).
  // Set during ALTER TABLE operation. In alter mode, alias name is stored
  // in data-dictionary to avoid name conflicts.
  /////////////////////////////////////////////////////////////////////////
 
  virtual bool is_alter_mode() const = 0;
  virtual void set_alter_mode(bool alter_mode) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // Alias check constriaint name.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const String_type &alias_name() const = 0;
  virtual void set_alias_name(const String_type &alias_name) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // Parent table.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const Table &table() const = 0;
 
  virtual Table &table() = 0;
 
  /**
    Converts *this into json.
 
    Converts all member variables that are to be included in the sdi
    into json by transforming them appropriately and passing them to
    the rapidjson writer provided.
 
    @param wctx opaque context for data needed by serialization
    @param w rapidjson writer which will perform conversion to json
 
  */
 
  virtual void serialize(Sdi_wcontext *wctx, Sdi_writer *w) const = 0;
 
  /**
    Re-establishes the state of *this by reading sdi information from
    the rapidjson DOM subobject provided.
 
    Cross-references encountered within this object are tracked in
    sdictx, so that they can be updated when the entire object graph
    has been established.
 
    @param rctx stores book-keeping information for the
    deserialization process
    @param val subobject of rapidjson DOM containing json
    representation of this object
    @retval false success
    @retval true  failure
  */
 
  virtual bool deserialize(Sdi_rcontext *rctx, const RJ_Value &val) = 0;
};
 
///////////////////////////////////////////////////////////////////////////
 
}  // namespace dd
 
#endif  // DD__CHECK_CONSTRAINTS_INCLUDED