/* Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.

   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
   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
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#ifndef _SP_H_
#define _SP_H_

#include "sql_string.h"                         // LEX_STRING
#include "sp_head.h"                            // enum_sp_type


class Field;
class Open_tables_backup;
class Open_tables_state;
class Query_arena;
class Query_tables_list;
class Sroutine_hash_entry;
class THD;
class sp_cache;
struct st_sp_chistics;
struct LEX;
struct TABLE;
struct TABLE_LIST;
typedef struct st_hash HASH;
template <typename T> class SQL_I_List;


/* Tells what SP_DEFAULT_ACCESS should be mapped to */
#define SP_DEFAULT_ACCESS_MAPPING SP_CONTAINS_SQL

// Return codes from sp_create_*, sp_drop_*, and sp_show_*:
#define SP_OK                 0
#define SP_KEY_NOT_FOUND     -1
#define SP_OPEN_TABLE_FAILED -2
#define SP_WRITE_ROW_FAILED  -3
#define SP_DELETE_ROW_FAILED -4
#define SP_GET_FIELD_FAILED  -5
#define SP_PARSE_ERROR       -6
#define SP_INTERNAL_ERROR    -7
#define SP_NO_DB_ERROR       -8
#define SP_BAD_IDENTIFIER    -9
#define SP_BODY_TOO_LONG    -10
#define SP_FLD_STORE_FAILED -11

/* DB storage of Stored PROCEDUREs and FUNCTIONs */
enum
{
  MYSQL_PROC_FIELD_DB = 0,
  MYSQL_PROC_FIELD_NAME,
  MYSQL_PROC_MYSQL_TYPE,
  MYSQL_PROC_FIELD_SPECIFIC_NAME,
  MYSQL_PROC_FIELD_LANGUAGE,
  MYSQL_PROC_FIELD_ACCESS,
  MYSQL_PROC_FIELD_DETERMINISTIC,
  MYSQL_PROC_FIELD_SECURITY_TYPE,
  MYSQL_PROC_FIELD_PARAM_LIST,
  MYSQL_PROC_FIELD_RETURNS,
  MYSQL_PROC_FIELD_BODY,
  MYSQL_PROC_FIELD_DEFINER,
  MYSQL_PROC_FIELD_CREATED,
  MYSQL_PROC_FIELD_MODIFIED,
  MYSQL_PROC_FIELD_SQL_MODE,
  MYSQL_PROC_FIELD_COMMENT,
  MYSQL_PROC_FIELD_CHARACTER_SET_CLIENT,
  MYSQL_PROC_FIELD_COLLATION_CONNECTION,
  MYSQL_PROC_FIELD_DB_COLLATION,
  MYSQL_PROC_FIELD_BODY_UTF8,
  MYSQL_PROC_FIELD_COUNT
};

/* Drop all routines in database 'db' */
int sp_drop_db_routines(THD *thd, char *db);

/**
   Acquires exclusive metadata lock on all stored routines in the
   given database.

   @param  thd  Thread handler
   @param  db   Database name

   @retval  false  Success
   @retval  true   Failure
 */
bool lock_db_routines(THD *thd, char *db);

sp_head *sp_find_routine(THD *thd, enum_sp_type type, sp_name *name,
                         sp_cache **cp, bool cache_only);

int sp_cache_routine(THD *thd, Sroutine_hash_entry *rt,
                     bool lookup_only, sp_head **sp);

int sp_cache_routine(THD *thd, enum_sp_type type, sp_name *name,
                     bool lookup_only, sp_head **sp);

bool sp_exist_routines(THD *thd, TABLE_LIST *procs, bool is_proc);

bool sp_show_create_routine(THD *thd, enum_sp_type type, sp_name *name);

int sp_create_routine(THD *thd, sp_head *sp);

int sp_update_routine(THD *thd, enum_sp_type type, sp_name *name,
                      st_sp_chistics *chistics);

int sp_drop_routine(THD *thd, enum_sp_type type, sp_name *name);


/**
  Structure that represents element in the set of stored routines
  used by statement or routine.
*/

class Sroutine_hash_entry
{
public:
  /**
    Metadata lock request for routine.
    MDL_key in this request is also used as a key for set.
  */
  MDL_request mdl_request;
  /**
    Next element in list linking all routines in set. See also comments
    for LEX::sroutine/sroutine_list and sp_head::m_sroutines.
  */
  Sroutine_hash_entry *next;
  /**
    Uppermost view which directly or indirectly uses this routine.
    0 if routine is not used in view. Note that it also can be 0 if
    statement uses routine both via view and directly.
  */
  TABLE_LIST *belong_to_view;
  /**
    This is for prepared statement validation purposes.
    A statement looks up and pre-loads all its stored functions
    at prepare. Later on, if a function is gone from the cache,
    execute may fail.
    Remember the version of sp_head at prepare to be able to
    invalidate the prepared statement at execute if it
    changes.
  */
  ulong m_sp_cache_version;
};


/*
  Procedures for handling sets of stored routines used by statement or routine.
*/
void sp_add_used_routine(Query_tables_list *prelocking_ctx, Query_arena *arena,
                         sp_name *rt, enum_sp_type rt_type);
bool sp_add_used_routine(Query_tables_list *prelocking_ctx, Query_arena *arena,
                         const MDL_key *key, TABLE_LIST *belong_to_view);
void sp_remove_not_own_routines(Query_tables_list *prelocking_ctx);
void sp_update_stmt_used_routines(THD *thd, Query_tables_list *prelocking_ctx,
                                  HASH *src, TABLE_LIST *belong_to_view);
void sp_update_stmt_used_routines(THD *thd, Query_tables_list *prelocking_ctx,
                                  SQL_I_List<Sroutine_hash_entry> *src,
                                  TABLE_LIST *belong_to_view);

extern "C" uchar* sp_sroutine_key(const uchar *ptr, size_t *plen,
                                  my_bool first);

/*
  Routines which allow open/lock and close mysql.proc table even when
  we already have some tables open and locked.
*/
TABLE *open_proc_table_for_read(THD *thd, Open_tables_backup *backup);

sp_head *sp_load_for_information_schema(THD *thd, TABLE *proc_table, String *db,
                                        String *name, sql_mode_t sql_mode,
                                        enum_sp_type type,
                                        const char *returns, const char *params,
                                        bool *free_sp_head);

bool load_charset(MEM_ROOT *mem_root,
                  Field *field,
                  const CHARSET_INFO *dflt_cs,
                  const CHARSET_INFO **cs);

bool load_collation(MEM_ROOT *mem_root,
                    Field *field,
                    const CHARSET_INFO *dflt_cl,
                    const CHARSET_INFO **cl);

///////////////////////////////////////////////////////////////////////////

sp_head *sp_start_parsing(THD *thd,
                          enum_sp_type sp_type,
                          sp_name *sp_name);

void sp_finish_parsing(THD *thd);

///////////////////////////////////////////////////////////////////////////

Item_result sp_map_result_type(enum enum_field_types type);
Item::Type sp_map_item_type(enum enum_field_types type);
uint sp_get_flags_for_command(LEX *lex);

bool sp_check_name(LEX_STRING *ident);

TABLE_LIST *sp_add_to_query_tables(THD *thd, LEX *lex,
                                   const char *db, const char *name,
                                   thr_lock_type locktype,
                                   enum_mdl_type mdl_type);

bool sp_check_show_access(THD *thd, sp_head *sp, bool *full_access);

Item *sp_prepare_func_item(THD* thd, Item **it_addr);

bool sp_eval_expr(THD *thd, Field *result_field, Item **expr_item_ptr);

String *sp_get_item_value(THD *thd, Item *item, String *str);

///////////////////////////////////////////////////////////////////////////

#endif /* _SP_H_ */
