mariadb/sql/sp.cc

/* Copyright (C) 2002 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   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 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


#include "mysql_priv.h"
#include "sql_acl.h"
#include "sp.h"
#include "sp_head.h"
#include "sp_cache.h"

static char *
create_string(THD *thd, ulong *lenp,
	      int sp_type,
	      sp_name *name,
	      const char *params, ulong paramslen,
	      const char *returns, ulong returnslen,
	      const char *body, ulong bodylen,
	      st_sp_chistics *chistics);

/*
 *
 * DB storage of Stored PROCEDUREs and FUNCTIONs
 *
 */

enum
{
  MYSQL_PROC_FIELD_DB = 0,
  MYSQL_PROC_FIELD_NAME,
  MYSQL_PROC_FIELD_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_COUNT
};

/* *opened=true means we opened ourselves */
static int
db_find_routine_aux(THD *thd, int type, sp_name *name,
		    enum thr_lock_type ltype, TABLE **tablep, bool *opened)
{
  TABLE *table;
  byte key[64+64+1];		// db, name, type
  uint keylen;
  DBUG_ENTER("db_find_routine_aux");
  DBUG_PRINT("enter", ("type: %d name: %*s",
		       type, name->m_name.length, name->m_name.str));

  // Put the key used to read the row together
  keylen= name->m_db.length;
  if (keylen > 64)
    keylen= 64;
  memcpy(key, name->m_db.str, keylen);
  memset(key+keylen, (int)' ', 64-keylen); // Pad with space
  keylen= name->m_name.length;
  if (keylen > 64)
    keylen= 64;
  memcpy(key+64, name->m_name.str, keylen);
  memset(key+64+keylen, (int)' ', 64-keylen); // Pad with space
  key[128]= type;
  keylen= sizeof(key);

  for (table= thd->open_tables ; table ; table= table->next)
    if (strcmp(table->table_cache_key, "mysql") == 0 &&
	strcmp(table->real_name, "proc") == 0)
      break;
  if (table)
    *opened= FALSE;
  else
  {
    TABLE_LIST tables;

    memset(&tables, 0, sizeof(tables));
    tables.db= (char*)"mysql";
    tables.real_name= tables.alias= (char*)"proc";
    if (! (table= open_ltable(thd, &tables, ltype)))
    {
      *tablep= NULL;
      DBUG_RETURN(SP_OPEN_TABLE_FAILED);
    }
    *opened= TRUE;
  }

  if (table->file->index_read_idx(table->record[0], 0,
				  key, keylen,
				  HA_READ_KEY_EXACT))
  {
    *tablep= NULL;
    DBUG_RETURN(SP_KEY_NOT_FOUND);
  }
  *tablep= table;

  DBUG_RETURN(SP_OK);
}


static int
db_find_routine(THD *thd, int type, sp_name *name, sp_head **sphp)
{
  extern int yyparse(void *thd);
  TABLE *table;
  const char *params, *returns, *body;
  int ret;
  bool opened;
  const char *definer;
  longlong created;
  longlong modified;
  st_sp_chistics chistics;
  char *ptr;
  uint length;
  char buff[65];
  String str(buff, sizeof(buff), &my_charset_bin);
  ulong sql_mode;
  DBUG_ENTER("db_find_routine");
  DBUG_PRINT("enter", ("type: %d name: %*s",
		       type, name->m_name.length, name->m_name.str));

  ret= db_find_routine_aux(thd, type, name, TL_READ, &table, &opened);
  if (ret != SP_OK)
    goto done;

  if (table->fields != MYSQL_PROC_FIELD_COUNT)
  {
    ret= SP_GET_FIELD_FAILED;
    goto done;
  }

  if ((ptr= get_field(&thd->mem_root,
		      table->field[MYSQL_PROC_FIELD_DETERMINISTIC])) == NULL)
  {
    ret= SP_GET_FIELD_FAILED;
    goto done;
  }
  bzero((char *)&chistics, sizeof(chistics));
  chistics.detistic= (ptr[0] == 'N' ? FALSE : TRUE);    

  if ((ptr= get_field(&thd->mem_root,
		      table->field[MYSQL_PROC_FIELD_SECURITY_TYPE])) == NULL)
  {
    ret= SP_GET_FIELD_FAILED;
    goto done;
  }
  chistics.suid= (ptr[0] == 'I' ? IS_NOT_SUID : IS_SUID);    

  if ((params= get_field(&thd->mem_root,
			 table->field[MYSQL_PROC_FIELD_PARAM_LIST])) == NULL)
  {
    params= "";
  }

  if (type == TYPE_ENUM_PROCEDURE)
    returns= "";
  else if ((returns= get_field(&thd->mem_root,
			       table->field[MYSQL_PROC_FIELD_RETURNS])) == NULL)
  {
    ret= SP_GET_FIELD_FAILED;
    goto done;
  }

  if ((body= get_field(&thd->mem_root,
		       table->field[MYSQL_PROC_FIELD_BODY])) == NULL)
  {
    ret= SP_GET_FIELD_FAILED;
    goto done;
  }

  // Get additional information
  if ((definer= get_field(&thd->mem_root,
			  table->field[MYSQL_PROC_FIELD_DEFINER])) == NULL)
  {
    ret= SP_GET_FIELD_FAILED;
    goto done;
  }

  modified= table->field[MYSQL_PROC_FIELD_MODIFIED]->val_int();
  created= table->field[MYSQL_PROC_FIELD_CREATED]->val_int();

  sql_mode= (ulong) table->field[MYSQL_PROC_FIELD_SQL_MODE]->val_int();

  table->field[MYSQL_PROC_FIELD_COMMENT]->val_str(&str, &str);

  ptr= 0;
  if ((length= str.length()))
    ptr= thd->strmake(str.ptr(), length);
  chistics.comment.str= ptr;
  chistics.comment.length= length;

  if (opened)
  {
    opened= FALSE;
    close_thread_tables(thd, 0, 1);
  }

  {
    char *defstr;
    ulong deflen;
    LEX *oldlex= thd->lex;
    char olddb[128];
    bool dbchanged;
    enum enum_sql_command oldcmd= thd->lex->sql_command;
    ulong old_sql_mode= thd->variables.sql_mode;
    ha_rows select_limit= thd->variables.select_limit;

    thd->variables.sql_mode= sql_mode;
    thd->variables.select_limit= HA_POS_ERROR;

    if (!(defstr= create_string(thd, &deflen,
				type,
				name,
				params, strlen(params),
				returns, strlen(returns),
				body, strlen(body),
				&chistics)))
    {
      ret= SP_INTERNAL_ERROR;
      goto done;
    }

    dbchanged= FALSE;
    if ((ret= sp_use_new_db(thd, name->m_db.str, olddb, sizeof(olddb),
			    1, &dbchanged)))
      goto done;

    {
      /* This is something of a kludge. We need to initialize some fields
       * in thd->lex (the unit and master stuff), and the easiest way to
       * do it is, is to call mysql_init_query(), but this unfortunately
       * resets teh value_list where we keep the CALL parameters. So we
       * copy the list and then restore it.
       */
      List<Item> vals= thd->lex->value_list;

      mysql_init_query(thd, TRUE);
      lex_start(thd, (uchar*)defstr, deflen);
      thd->lex->value_list= vals;
    }

    if (yyparse(thd) || thd->is_fatal_error || thd->lex->sphead == NULL)
    {
      LEX *newlex= thd->lex;
      sp_head *sp= newlex->sphead;

      if (dbchanged && (ret= sp_change_db(thd, olddb, 1)))
	goto done;
      if (sp)
      {
	if (oldlex != newlex)
	  sp->restore_lex(thd);
	delete sp;
	newlex->sphead= NULL;
      }
      ret= SP_PARSE_ERROR;
    }
    else
    {
      if (dbchanged && (ret= sp_change_db(thd, olddb, 1)))
	goto done;
      *sphp= thd->lex->sphead;
      (*sphp)->set_info((char *)definer, (uint)strlen(definer),
			created, modified, &chistics);
    }
    thd->lex->sql_command= oldcmd;
    thd->variables.sql_mode= old_sql_mode;
    thd->variables.select_limit= select_limit;
  }

 done:

  if (opened)
    close_thread_tables(thd);
  DBUG_RETURN(ret);
}


static int
db_create_routine(THD *thd, int type, sp_head *sp)
{
  int ret;
  TABLE *table;
  TABLE_LIST tables;
  char definer[HOSTNAME_LENGTH+USERNAME_LENGTH+2];
  DBUG_ENTER("db_create_routine");
  DBUG_PRINT("enter", ("type: %d name: %*s",type,sp->m_name.length,sp->m_name.str));

  memset(&tables, 0, sizeof(tables));
  tables.db= (char*)"mysql";
  tables.real_name= tables.alias= (char*)"proc";

  if (! (table= open_ltable(thd, &tables, TL_WRITE)))
    ret= SP_OPEN_TABLE_FAILED;
  else
  {
    restore_record(table, default_values); // Get default values for fields
    strxmov(definer, thd->priv_user, "@", thd->priv_host, NullS);

    if (table->fields != MYSQL_PROC_FIELD_COUNT)
    {
      ret= SP_GET_FIELD_FAILED;
      goto done;
    }
    table->field[MYSQL_PROC_FIELD_DB]->
      store(sp->m_db.str, sp->m_db.length, system_charset_info);
    table->field[MYSQL_PROC_FIELD_NAME]->
      store(sp->m_name.str, sp->m_name.length, system_charset_info);
    table->field[MYSQL_PROC_FIELD_TYPE]->
      store((longlong)type);
    table->field[MYSQL_PROC_FIELD_SPECIFIC_NAME]->
      store(sp->m_name.str, sp->m_name.length, system_charset_info);
    table->field[MYSQL_PROC_FIELD_DETERMINISTIC]->
      store((longlong)(sp->m_chistics->detistic ? 1 : 2));
    if (sp->m_chistics->suid != IS_DEFAULT_SUID)
      table->field[MYSQL_PROC_FIELD_SECURITY_TYPE]->
	store((longlong)sp->m_chistics->suid);
    table->field[MYSQL_PROC_FIELD_PARAM_LIST]->
      store(sp->m_params.str, sp->m_params.length, system_charset_info);
    if (sp->m_retstr.str)
      table->field[MYSQL_PROC_FIELD_RETURNS]->
	store(sp->m_retstr.str, sp->m_retstr.length, system_charset_info);
    table->field[MYSQL_PROC_FIELD_BODY]->
      store(sp->m_body.str, sp->m_body.length, system_charset_info);
    table->field[MYSQL_PROC_FIELD_DEFINER]->
      store(definer, (uint)strlen(definer), system_charset_info);
    ((Field_timestamp *)table->field[MYSQL_PROC_FIELD_CREATED])->set_time();
    table->field[MYSQL_PROC_FIELD_SQL_MODE]->
      store((longlong)thd->variables.sql_mode);
    if (sp->m_chistics->comment.str)
      table->field[MYSQL_PROC_FIELD_COMMENT]->
	store(sp->m_chistics->comment.str, sp->m_chistics->comment.length,
	      system_charset_info);

    ret= SP_OK;
    if (table->file->write_row(table->record[0]))
      ret= SP_WRITE_ROW_FAILED;
  }

done:
  close_thread_tables(thd);
  DBUG_RETURN(ret);
}


static int
db_drop_routine(THD *thd, int type, sp_name *name)
{
  TABLE *table;
  int ret;
  bool opened;
  DBUG_ENTER("db_drop_routine");
  DBUG_PRINT("enter", ("type: %d name: %*s",
		       type, name->m_name.length, name->m_name.str));

  ret= db_find_routine_aux(thd, type, name, TL_WRITE, &table, &opened);
  if (ret == SP_OK)
  {
    if (table->file->delete_row(table->record[0]))
      ret= SP_DELETE_ROW_FAILED;
  }

  if (opened)
    close_thread_tables(thd);
  DBUG_RETURN(ret);
}


static int
db_update_routine(THD *thd, int type, sp_name *name,
		  char *newname, uint newnamelen,
		  st_sp_chistics *chistics)
{
  TABLE *table;
  int ret;
  bool opened;
  DBUG_ENTER("db_update_routine");
  DBUG_PRINT("enter", ("type: %d name: %*s",
		       type, name->m_name.length, name->m_name.str));

  ret= db_find_routine_aux(thd, type, name, TL_WRITE, &table, &opened);
  if (ret == SP_OK)
  {
    store_record(table,record[1]);
    ((Field_timestamp *)table->field[MYSQL_PROC_FIELD_MODIFIED])->set_time();
    if (chistics->suid != IS_DEFAULT_SUID)
      table->field[MYSQL_PROC_FIELD_SECURITY_TYPE]->store((longlong)chistics->suid);
    if (newname)
      table->field[MYSQL_PROC_FIELD_NAME]->store(newname,
						 newnamelen,
						 system_charset_info);
    if (chistics->comment.str)
      table->field[MYSQL_PROC_FIELD_COMMENT]->store(chistics->comment.str,
						    chistics->comment.length,
						    system_charset_info);
    if ((table->file->update_row(table->record[1],table->record[0])))
      ret= SP_WRITE_ROW_FAILED;
  }
  if (opened)
    close_thread_tables(thd);
  DBUG_RETURN(ret);
}


struct st_used_field
{
  const char *field_name;
  uint field_length;
  enum enum_field_types field_type;
  Field *field;
};

static struct st_used_field init_fields[]=
{
  { "Db",       NAME_LEN, MYSQL_TYPE_STRING,    0},
  { "Name",     NAME_LEN, MYSQL_TYPE_STRING,    0},
  { "Type",            9, MYSQL_TYPE_STRING,    0},
  { "Definer",        77, MYSQL_TYPE_STRING,    0},
  { "Modified",        0, MYSQL_TYPE_TIMESTAMP, 0},
  { "Created",         0, MYSQL_TYPE_TIMESTAMP, 0},
  { "Security_type",   1, MYSQL_TYPE_STRING,    0},
  { "Comment",  NAME_LEN, MYSQL_TYPE_STRING,    0},
  { 0,                 0, MYSQL_TYPE_STRING,    0}
};


static int
print_field_values(THD *thd, TABLE *table,
		   struct st_used_field *used_fields,
		   int type, const char *wild)
{
  Protocol *protocol= thd->protocol;

  if (table->field[MYSQL_PROC_FIELD_TYPE]->val_int() == type)
  {
    String db_string;
    String name_string;
    struct st_used_field *used_field= used_fields;

    if (get_field(&thd->mem_root, used_field->field, &db_string))
      db_string.set_ascii("", 0);
    used_field+= 1;
    get_field(&thd->mem_root, used_field->field, &name_string);

    if (!wild || !wild[0] || !wild_compare(name_string.ptr(), wild, 0))
    {
      protocol->prepare_for_resend();
      protocol->store(&db_string);
      protocol->store(&name_string);
      for (used_field++;
	   used_field->field_name;
	   used_field++)
      {
	switch (used_field->field_type) {
	case MYSQL_TYPE_TIMESTAMP:
	  {
	    TIME tmp_time;

	    bzero((char *)&tmp_time, sizeof(tmp_time));
	    ((Field_timestamp *) used_field->field)->get_time(&tmp_time);
	    protocol->store(&tmp_time);
	  }
	  break;
	default:
	  {
	    String tmp_string;

	    get_field(&thd->mem_root, used_field->field, &tmp_string);
	    protocol->store(&tmp_string);
	  }
	  break;
	}
      }
      if (protocol->write())
	return SP_INTERNAL_ERROR;
    }
  }
  return SP_OK;
}


static int
db_show_routine_status(THD *thd, int type, const char *wild)
{
  TABLE *table;
  TABLE_LIST tables;
  int res;
  DBUG_ENTER("db_show_routine_status");

  memset(&tables, 0, sizeof(tables));
  tables.db= (char*)"mysql";
  tables.real_name= tables.alias= (char*)"proc";

  if (! (table= open_ltable(thd, &tables, TL_READ)))
  {
    res= SP_OPEN_TABLE_FAILED;
    goto done;
  }
  else
  {
    Item *item;
    List<Item> field_list;
    struct st_used_field *used_field;
    st_used_field used_fields[array_elements(init_fields)];

    memcpy((char*) used_fields, (char*) init_fields, sizeof(used_fields));
    /* Init header */
    for (used_field= &used_fields[0];
	 used_field->field_name;
	 used_field++)
    {
      switch (used_field->field_type) {
      case MYSQL_TYPE_TIMESTAMP:
	field_list.push_back(item=new Item_datetime(used_field->field_name));
	break;
      default:
	field_list.push_back(item=new Item_empty_string(used_field->field_name,
							used_field->
							field_length));
	break;
      }
    }
    /* Print header */
    if (thd->protocol->send_fields(&field_list,1))
    {
      res= SP_INTERNAL_ERROR;
      goto err_case;
    }

    /* Init fields */
    setup_tables(&tables);
    for (used_field= &used_fields[0];
	 used_field->field_name;
	 used_field++)
    {
      TABLE_LIST *not_used;
      Item_field *field= new Item_field("mysql", "proc",
					used_field->field_name);
      if (!(used_field->field= find_field_in_tables(thd, field, &tables, 
						    &not_used, TRUE)))
      {
	res= SP_INTERNAL_ERROR;
	goto err_case1;
      }
    }

    table->file->index_init(0);
    if ((res= table->file->index_first(table->record[0])))
    {
      res= (res == HA_ERR_END_OF_FILE) ? 0 : SP_INTERNAL_ERROR;
      goto err_case1;
    }
    if ((res= print_field_values(thd, table, used_fields, type, wild)))
      goto err_case1;
    while (!table->file->index_next(table->record[0]))
    {
      if ((res= print_field_values(thd, table, used_fields, type, wild)))
	goto err_case1;
    }
    res= SP_OK;
  }

err_case1:
  send_eof(thd);
err_case:
  close_thread_tables(thd);
done:
  DBUG_RETURN(res);
}


/* Drop all routines in database 'db' */
int
sp_drop_db_routines(THD *thd, char *db)
{
  TABLE *table;
  byte key[64];			// db
  uint keylen;
  int ret;
  DBUG_ENTER("sp_drop_db_routines");
  DBUG_PRINT("enter", ("db: %s", db));

  // Put the key used to read the row together
  keylen= strlen(db);
  if (keylen > 64)
    keylen= 64;
  memcpy(key, db, keylen);
  memset(key+keylen, (int)' ', 64-keylen); // Pad with space
  keylen= sizeof(key);

  for (table= thd->open_tables ; table ; table= table->next)
    if (strcmp(table->table_cache_key, "mysql") == 0 &&
	strcmp(table->real_name, "proc") == 0)
      break;
  if (! table)
  {
    TABLE_LIST tables;

    memset(&tables, 0, sizeof(tables));
    tables.db= (char*)"mysql";
    tables.real_name= tables.alias= (char*)"proc";
    if (! (table= open_ltable(thd, &tables, TL_WRITE)))
      DBUG_RETURN(SP_OPEN_TABLE_FAILED);
  }

  ret= SP_OK;
  table->file->index_init(0);
  if (! table->file->index_read(table->record[0],
				key, keylen, HA_READ_KEY_EXACT))
  {
    int nxtres;
    bool deleted= FALSE;

    do {
      if (! table->file->delete_row(table->record[0]))
	deleted= TRUE;		/* We deleted something */
      else
      {
	ret= SP_DELETE_ROW_FAILED;
	nxtres= 0;
	break;
      }
    } while (! (nxtres= table->file->index_next_same(table->record[0],
						     key, keylen)));
    if (nxtres != HA_ERR_END_OF_FILE)
      ret= SP_KEY_NOT_FOUND;
    if (deleted)
      sp_cache_invalidate();
  }

  close_thread_tables(thd);

  DBUG_RETURN(ret);
}


/*****************************************************************************
  PROCEDURE
******************************************************************************/

sp_head *
sp_find_procedure(THD *thd, sp_name *name)
{
  sp_head *sp;
  DBUG_ENTER("sp_find_procedure");
  DBUG_PRINT("enter", ("name: %*s.%*s",
		       name->m_db.length, name->m_db.str,
		       name->m_name.length, name->m_name.str));

  if (!(sp= sp_cache_lookup(&thd->sp_proc_cache, name)))
  {
    if (db_find_routine(thd, TYPE_ENUM_PROCEDURE, name, &sp) == SP_OK)
      sp_cache_insert(&thd->sp_proc_cache, sp);
  }

  DBUG_RETURN(sp);
}


int
sp_create_procedure(THD *thd, sp_head *sp)
{
  int ret;
  DBUG_ENTER("sp_create_procedure");
  DBUG_PRINT("enter", ("name: %*s", sp->m_name.length, sp->m_name.str));

  ret= db_create_routine(thd, TYPE_ENUM_PROCEDURE, sp);
  DBUG_RETURN(ret);
}


int
sp_drop_procedure(THD *thd, sp_name *name)
{
  int ret;
  DBUG_ENTER("sp_drop_procedure");
  DBUG_PRINT("enter", ("name: %*s", name->m_name.length, name->m_name.str));

  sp_cache_remove(&thd->sp_proc_cache, name);
  ret= db_drop_routine(thd, TYPE_ENUM_PROCEDURE, name);
  DBUG_RETURN(ret);
}


int
sp_update_procedure(THD *thd, sp_name *name,
		    char *newname, uint newnamelen,
		    st_sp_chistics *chistics)
{
  int ret;
  DBUG_ENTER("sp_update_procedure");
  DBUG_PRINT("enter", ("name: %*s", name->m_name.length, name->m_name.str));

  sp_cache_remove(&thd->sp_proc_cache, name);
  ret= db_update_routine(thd, TYPE_ENUM_PROCEDURE, name,
			 newname, newnamelen, chistics);
  DBUG_RETURN(ret);
}


int
sp_show_create_procedure(THD *thd, sp_name *name)
{
  sp_head *sp;
  DBUG_ENTER("sp_show_create_procedure");
  DBUG_PRINT("enter", ("name: %*s", name->m_name.length, name->m_name.str));

  if ((sp= sp_find_procedure(thd, name)))
  {
    int ret= sp->show_create_procedure(thd);

    DBUG_RETURN(ret);
  }

  DBUG_RETURN(SP_KEY_NOT_FOUND);
}


int
sp_show_status_procedure(THD *thd, const char *wild)
{
  int ret;
  DBUG_ENTER("sp_show_status_procedure");

  ret= db_show_routine_status(thd, TYPE_ENUM_PROCEDURE, wild);
  DBUG_RETURN(ret);
}


/*****************************************************************************
  FUNCTION
******************************************************************************/

sp_head *
sp_find_function(THD *thd, sp_name *name)
{
  sp_head *sp;
  DBUG_ENTER("sp_find_function");
  DBUG_PRINT("enter", ("name: %*s", name->m_name.length, name->m_name.str));

  if (!(sp= sp_cache_lookup(&thd->sp_func_cache, name)))
  {
    if (db_find_routine(thd, TYPE_ENUM_FUNCTION, name, &sp) != SP_OK)
      sp= NULL;
    else
      sp_cache_insert(&thd->sp_func_cache, sp);
  }
  DBUG_RETURN(sp);
}


int
sp_create_function(THD *thd, sp_head *sp)
{
  int ret;
  DBUG_ENTER("sp_create_function");
  DBUG_PRINT("enter", ("name: %*s", sp->m_name.length, sp->m_name.str));

  ret= db_create_routine(thd, TYPE_ENUM_FUNCTION, sp);
  DBUG_RETURN(ret);
}


int
sp_drop_function(THD *thd, sp_name *name)
{
  int ret;
  DBUG_ENTER("sp_drop_function");
  DBUG_PRINT("enter", ("name: %*s", name->m_name.length, name->m_name.str));

  sp_cache_remove(&thd->sp_func_cache, name);
  ret= db_drop_routine(thd, TYPE_ENUM_FUNCTION, name);
  DBUG_RETURN(ret);
}


int
sp_update_function(THD *thd, sp_name *name,
		    char *newname, uint newnamelen,
		    st_sp_chistics *chistics)
{
  int ret;
  DBUG_ENTER("sp_update_procedure");
  DBUG_PRINT("enter", ("name: %*s", name->m_name.length, name->m_name.str));

  sp_cache_remove(&thd->sp_func_cache, name);
  ret= db_update_routine(thd, TYPE_ENUM_FUNCTION, name,
			 newname, newnamelen, chistics);
  DBUG_RETURN(ret);
}


int
sp_show_create_function(THD *thd, sp_name *name)
{
  sp_head *sp;
  DBUG_ENTER("sp_show_create_function");
  DBUG_PRINT("enter", ("name: %*s", name->m_name.length, name->m_name.str));

  if ((sp= sp_find_function(thd, name)))
  {
    int ret= sp->show_create_function(thd);

    DBUG_RETURN(ret);
  }
  DBUG_RETURN(SP_KEY_NOT_FOUND);
}


int
sp_show_status_function(THD *thd, const char *wild)
{
  int ret;
  DBUG_ENTER("sp_show_status_function");
  ret= db_show_routine_status(thd, TYPE_ENUM_FUNCTION, wild);
  DBUG_RETURN(ret);
}


bool
sp_function_exists(THD *thd, sp_name *name)
{
  TABLE *table;
  bool ret= FALSE;
  bool opened= FALSE;
  DBUG_ENTER("sp_function_exists");

  if (sp_cache_lookup(&thd->sp_func_cache, name) ||
      db_find_routine_aux(thd, TYPE_ENUM_FUNCTION,
			  name, TL_READ,
			  &table, &opened) == SP_OK)
    ret= TRUE;
  if (opened)
    close_thread_tables(thd, 0, 1);
  DBUG_RETURN(ret);
}


byte *
sp_lex_spfuns_key(const byte *ptr, uint *plen, my_bool first)
{
  LEX_STRING *lsp= (LEX_STRING *)ptr;
  *plen= lsp->length;
  return (byte *)lsp->str;
}


void
sp_add_fun_to_lex(LEX *lex, sp_name *fun)
{
  if (! hash_search(&lex->spfuns,
		    (byte *)fun->m_qname.str, fun->m_qname.length))
  {
    LEX_STRING *ls= (LEX_STRING *)sql_alloc(sizeof(LEX_STRING));
    ls->str= sql_strmake(fun->m_qname.str, fun->m_qname.length);
    ls->length= fun->m_qname.length;

    my_hash_insert(&lex->spfuns, (byte *)ls);
  }
}


void
sp_merge_funs(LEX *dst, LEX *src)
{
  for (uint i=0 ; i < src->spfuns.records ; i++)
  {
    LEX_STRING *ls= (LEX_STRING *)hash_element(&src->spfuns, i);

    if (! hash_search(&dst->spfuns, (byte *)ls->str, ls->length))
      my_hash_insert(&dst->spfuns, (byte *)ls);
  }
}


int
sp_cache_functions(THD *thd, LEX *lex)
{
  HASH *h= &lex->spfuns;
  int ret= 0;

  for (uint i=0 ; i < h->records ; i++)
  {
    LEX_STRING *ls= (LEX_STRING *)hash_element(h, i);
    sp_name name(*ls);

    name.m_qname= *ls;
    if (! sp_cache_lookup(&thd->sp_func_cache, &name))
    {
      sp_head *sp;
      LEX *oldlex= thd->lex;
      LEX *newlex= new st_lex;

      thd->lex= newlex;
      name.m_name.str= strchr(name.m_qname.str, '.');
      name.m_db.length= name.m_name.str - name.m_qname.str;
      name.m_db.str= strmake_root(&thd->mem_root,
				  name.m_qname.str, name.m_db.length);
      name.m_name.str+= 1;
      name.m_name.length= name.m_qname.length - name.m_db.length - 1;

      if (db_find_routine(thd, TYPE_ENUM_FUNCTION, &name, &sp)
	  == SP_OK)
      {
	ret= sp_cache_functions(thd, newlex);
	delete newlex;
	thd->lex= oldlex;
	if (ret)
	  break;
	sp_cache_insert(&thd->sp_func_cache, sp);
      }
      else
      {
	delete newlex;
	thd->lex= oldlex;
	net_printf(thd, ER_SP_DOES_NOT_EXIST, "FUNCTION", ls->str);
	ret= 1;
	break;
      }
    }
  }
  return ret;
}


static char *
create_string(THD *thd, ulong *lenp,
	      int type,
	      sp_name *name,
	      const char *params, ulong paramslen,
	      const char *returns, ulong returnslen,
	      const char *body, ulong bodylen,
	      st_sp_chistics *chistics)
{
  char *buf, *ptr;
  ulong buflen;

  buflen= 100 + name->m_qname.length + paramslen + returnslen + bodylen +
    chistics->comment.length;
  if (!(buf= thd->alloc(buflen)))
    return 0;

  ptr= strxmov(buf, "CREATE ",
	       (type == TYPE_ENUM_FUNCTION) ? "FUNCTION" : "PROCEDURE",
	       " `", name->m_db.str, "`.`", name->m_name.str, "`(", params, ")",
	       NullS);

  if (type == TYPE_ENUM_FUNCTION)
    ptr= strxmov(ptr, " RETURNS ", returns, NullS);
  *ptr++= '\n';

  if (chistics->detistic)
    ptr= strmov(ptr, "    DETERMINISTIC\n");
  if (chistics->suid == IS_NOT_SUID)
    ptr= strmov(ptr, "    SQL SECURITY INVOKER\n");
  if (chistics->comment.length)
  {
    ptr= strmov(strnmov(strmov(ptr, "    COMMENT '"),chistics->comment.str,
			chistics->comment.length),"'\n");
  }
  ptr= strmov(ptr, body);
  *lenp= (ptr-buf);
  return buf;
}


//
// Utilities...
//

int
sp_use_new_db(THD *thd, char *newdb, char *olddb, uint olddblen,
	      bool no_access_check, bool *dbchangedp)
{
  bool changeit;
  DBUG_ENTER("sp_use_new_db");
  DBUG_PRINT("enter", ("newdb: %s", newdb));

  if (thd->db && thd->db[0])
  {
    if (my_strcasecmp(system_charset_info, thd->db, newdb) == 0)
      changeit= 0;
    else
    {
      changeit= 1;
      strnmov(olddb, thd->db, olddblen);
    }
  }
  else
  {				// thd->db empty
    if (newdb[0])
      changeit= 1;
    else
      changeit= 0;
    olddb[0] = '\0';
  }
  if (!changeit)
  {
    *dbchangedp= FALSE;
    DBUG_RETURN(0);
  }
  else
  {
    int ret= sp_change_db(thd, newdb, no_access_check);

    if (! ret)
      *dbchangedp= TRUE;
    DBUG_RETURN(ret);
  }
}

/*
  Change database.

  SYNOPSIS
    sp_change_db()
    thd		    Thread handler
    name	    Database name
    empty_is_ok     True= it's ok with "" as name
    no_access_check True= don't do access check

  DESCRIPTION
    This is the same as mysql_change_db(), but with some extra
    arguments for Stored Procedure usage; doing implicit "use" 
    when executing an SP in a different database.
    We also use different error routines, since this might be
    invoked from a function when executing a query or statement.
    Note: We would have prefered to reuse mysql_change_db(), but
      the error handling in particular made that too awkward, so
      we (reluctantly) have a "copy" here.

  RETURN VALUES
    0	ok
    1	error
*/

int
sp_change_db(THD *thd, char *name, bool no_access_check)
{
  int length, db_length;
  char *dbname=my_strdup((char*) name,MYF(MY_WME));
  char	path[FN_REFLEN];
  ulong db_access;
  HA_CREATE_INFO create;
  DBUG_ENTER("sp_change_db");
  DBUG_PRINT("enter", ("db: %s, no_access_check: %d", name, no_access_check));

  db_length= (!dbname ? 0 : strip_sp(dbname));
  if (dbname && db_length)
  {
    if ((db_length > NAME_LEN) || check_db_name(dbname))
    {
      my_printf_error(ER_WRONG_DB_NAME, ER(ER_WRONG_DB_NAME), MYF(0), dbname);
      x_free(dbname);
      DBUG_RETURN(1);
    }
  }

  if (dbname && db_length)
  {
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (! no_access_check)
    {
      if (test_all_bits(thd->master_access,DB_ACLS))
	db_access=DB_ACLS;
      else
	db_access= (acl_get(thd->host,thd->ip, thd->priv_user,dbname,0) |
		    thd->master_access);  
      if (!(db_access & DB_ACLS) &&
	  (!grant_option || check_grant_db(thd,dbname)))
      {
	my_printf_error(ER_DBACCESS_DENIED_ERROR, ER(ER_DBACCESS_DENIED_ERROR),
			MYF(0),
			thd->priv_user,
			thd->priv_host,
			dbname);
	mysql_log.write(thd,COM_INIT_DB,ER(ER_DBACCESS_DENIED_ERROR),
			thd->priv_user,
			thd->priv_host,
			dbname);
	my_free(dbname,MYF(0));
	DBUG_RETURN(1);
      }
    }
#endif
    (void) sprintf(path,"%s/%s",mysql_data_home,dbname);
    length=unpack_dirname(path,path);		// Convert if not unix
    if (length && path[length-1] == FN_LIBCHAR)
      path[length-1]=0;				// remove ending '\'
    if (access(path,F_OK))
    {
      my_printf_error(ER_BAD_DB_ERROR, ER(ER_BAD_DB_ERROR), MYF(0), dbname);
      my_free(dbname,MYF(0));
      DBUG_RETURN(1);
    }
  }

  x_free(thd->db);
  thd->db=dbname;				// THD::~THD will free this
  thd->db_length=db_length;

  if (dbname && db_length)
  {
    strmov(path+unpack_dirname(path,path), MY_DB_OPT_FILE);
    load_db_opt(thd, path, &create);
    thd->db_charset= create.default_table_charset ?
      create.default_table_charset :
      thd->variables.collation_server;
    thd->variables.collation_database= thd->db_charset;
  }
  DBUG_RETURN(0);
}