dd_trigger.h

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/*
   Copyright (c) 2016, 2021, 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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   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
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   separately licensed software that they have included with MySQL.
 
   This program is distributed in the hope that it will be useful,
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   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_TRIGGER_INCLUDED
#define DD_TRIGGER_INCLUDED
 
#include "lex_string.h"
#include "sql/trigger_def.h"  // enum_trigger_order_type
 
struct MEM_ROOT;
class THD;
class Trigger;
 
template <class T>
class List;
 
namespace dd {
class Table;
 
/**
  Create new trigger in the data dictionary.
 
  @param [in]  thd                thread handle
  @param [in]  new_trigger        Trigger object from sql-layer that describes
                                  a trigger to add in the Data Dictionary
  @param [in]  ordering_clause    Ordering property for trigger being created
  @param [in]  referenced_trigger_name  Information about trigger referenced by
                                        ordering_clause if any.
 
 
  @return Operation status
    @retval true   Failure
    @retval false  Success
*/
 
bool create_trigger(THD *thd, const ::Trigger *new_trigger,
                    enum_trigger_order_type ordering_clause,
                    const LEX_CSTRING &referenced_trigger_name);
 
/**
  Load table triggers from the data dictionary.
 
  @param [in]  thd                thread handle
  @param [in]  mem_root           MEM_ROOT for memory allocation
  @param [in]  schema_name        name of schema
  @param [in]  table_name         subject table name
  @param [in]  table              table object
  @param [out] triggers           pointer to the list where new Trigger
                                  objects will be inserted
 
  @return Operation status
    @retval true   Failure
    @retval false  Success
*/
 
bool load_triggers(THD *thd, MEM_ROOT *mem_root, const char *schema_name,
                   const char *table_name, const dd::Table &table,
                   List<::Trigger> *triggers);
 
/**
  Check in the data dictionary if there is any trigger associated with a table.
 
  @param [in]  thd                thread handle
  @param [in]  schema_name        name of schema
  @param [in]  table_name         subject table name
  @param [out] table_has_trigger  true in case there is trigger(s) for a table,
                                  else false
 
  @return Operation status
    @retval true   Failure
    @retval false  Success
 
*/
 
bool table_has_triggers(THD *thd, const char *schema_name,
                        const char *table_name, bool *table_has_trigger);
 
}  // namespace dd
 
#endif /* DD_TRIGGER_INCLUDED */