check_constraints.h

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/* Copyright (c) 2019, 2023, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef DD_TABLES__CHECK_CONSTRAINTS_INCLUDED
#define DD_TABLES__CHECK_CONSTRAINTS_INCLUDED
 
#include "sql/dd/impl/types/object_table_impl.h"  // dd::Object_table_impl
#include "sql/dd/object_id.h"                     // dd::Object_id
 
namespace dd {
class Object_key;
 
namespace tables {
 
///////////////////////////////////////////////////////////////////////////
 
// The Check_constraints table has one row for each check constraint.
class Check_constraints : virtual public Object_table_impl {
 public:
  static const Check_constraints &instance();
 
  static const CHARSET_INFO *name_collation();
 
  enum enum_fields {
    FIELD_ID,
    FIELD_SCHEMA_ID,
    FIELD_TABLE_ID,
    FIELD_NAME,
    FIELD_ENFORCED,
    FIELD_CHECK_CLAUSE,
    FIELD_CHECK_CLAUSE_UTF8,
    NUMBER_OF_FIELDS  // Always keep this entry at the end of the enum
  };
 
  enum enum_indexes {
    INDEX_PK_ID = static_cast<uint>(Common_index::PK_ID),
    INDEX_UK_SCHEMA_ID_NAME = static_cast<uint>(Common_index::UK_NAME),
    INDEX_UK_TABLE_ID_NAME
  };
 
  enum enum_foreign_keys { FK_SCHEMA_ID, FK_TABLE_ID };
 
  Check_constraints();
 
  static Object_key *create_key_by_table_id(Object_id table_id);
 
  static Object_key *create_key_by_check_constraint_name(
      Object_id schema_id, const String_type &check_cons_name);
 
  /**
    Check if schema contains check constraints with specified name.
 
    @param        thd               Thread context.
    @param        schema_id         Id of schema to be inspected.
    @param        check_cons_name   Name of the check constraint.
    @param[out]   exists            Set to true if check constraint
                                    the the name provided exists in
                                    the schema, false otherwise.
 
    @retval      false    No error.
    @retval      true     Error.
  */
 
  static bool check_constraint_exists(THD *thd, Object_id schema_id,
                                      const String_type &check_cons_name,
                                      bool *exists);
};
 
///////////////////////////////////////////////////////////////////////////
 
}  // namespace tables
}  // namespace dd
 
#endif  // DD_TABLES__CHECK_CONSTRAINTS_INCLUDED