udf_registration.h

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/* Copyright (c) 2017, 2023, 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.
 
This program is also distributed with certain software (including
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as designated in a particular file or component or in included license
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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
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef UDF_REGISTRATION_H
#define UDF_REGISTRATION_H
 
#include <mysql/components/service.h>
#include <mysql/udf_registration_types.h>
 
/**
  Service for adding and removing UDF functions
*/
BEGIN_SERVICE_DEFINITION(udf_registration)
/**
  Registers a UDF function with a given name.
 
  The name must be unique. Does not store in any table, just
  updates the global function list.
  Plugins/components need to handle registration deregistration
  during their initialization and deinitialization.
  Registers a scalar UDF by default.
  @sa udf_aggregates
 
  @param name name of the function
  @param return_type return type.
  @param func function to call
  @param init_func function to call at query start
  @param deinit_func function to call at query cleanup
  @return Status of performed operation
  @retval false success
  @retval true failure
*/
DECLARE_BOOL_METHOD(udf_register,
                    (const char *func_name, enum Item_result return_type,
                     Udf_func_any func, Udf_func_init init_func,
                     Udf_func_deinit deinit_func));
 
/**
  Unregisters a UDF function with a given name.
 
  Does not store in any table, just updates the global function list.
  Plugins/components need to handle registration deregistration
  during their initialization and deinitialization.
 
  @param name name of the function
  @param[out] was_present set to non-zero if the UDF was present, but locked
  @return Status of performed operation
  @retval false success
  @retval true failure
*/
DECLARE_BOOL_METHOD(udf_unregister, (const char *name, int *was_present));
END_SERVICE_DEFINITION(udf_registration)
 
/**
  Service for turning
*/
BEGIN_SERVICE_DEFINITION(udf_registration_aggregate)
/**
  Registers an aggregate UDF function with a given name.
 
  The name must be unique. Does not store in any table, just
  updates the global function list.
  Plugins/components need to handle registration deregistration
  during their initialization and deinitialization.
  You can use udf_registration::unregister to unregister the
  function.
 
  @sa udf_registration
 
  @param name name of the function
  @param return_type return type.
  @param func function to call
  @param init_func function to call at query start
  @param deinit_func function to call at query cleanup
  @param add_func function to call at adding a row to the current aggregate
  @param clear_func function to call at the start of a new aggregate group
  @return Status of performed operation
  @retval false success
  @retval true failure
*/
DECLARE_BOOL_METHOD(udf_register,
                    (const char *func_name, enum Item_result return_type,
                     Udf_func_any func, Udf_func_init init_func,
                     Udf_func_deinit deinit_func, Udf_func_add add_func,
                     Udf_func_clear clear_func));
 
/**
  Unregisters an aggregate UDF function with a given name.
 
  Does not store in any table, just updates the global function list.
  Plugins/components need to handle registration deregistration
  during their initialization and deinitialization.
 
  Currently it's a synonym for udf_registration::udf_unregister.
 
  @param name name of the function
  @param[out] was_present set to non-zero if the UDF was present, but locked
  @return Status of performed operation
  @retval false success
  @retval true failure
*/
DECLARE_BOOL_METHOD(udf_unregister, (const char *name, int *was_present));
END_SERVICE_DEFINITION(udf_registration_aggregate)
#endif