Function mysql_ha_open

sql/sql_handler.cc:258–492

*/

bool mysql_ha_open(THD *thd, TABLE_LIST *tables, SQL_HANDLER *reopen)
{
  SQL_HANDLER   *sql_handler= 0;
  uint          counter;
  bool          error;
  TABLE         *table, *backup_open_tables;
  MDL_savepoint mdl_savepoint;
  Query_arena backup_arena;
  DBUG_ENTER("mysql_ha_open");
  DBUG_PRINT("enter",("'%s'.'%s' as '%s'  reopen: %d",
                      tables->db.str, tables->table_name.str, tables->alias.str,
                      reopen != 0));

  if (thd->locked_tables_mode)
  {
    my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
    DBUG_RETURN(TRUE);
  }
  if (tables->schema_table)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "HANDLER OPEN",
             INFORMATION_SCHEMA_NAME.str);
    DBUG_PRINT("exit",("ERROR"));
    DBUG_RETURN(TRUE);
  }

  if (! my_hash_inited(&thd->handler_tables_hash))
  {
    /*
      HASH entries are of type SQL_HANDLER
    */
    if (my_hash_init(key_memory_THD_handler_tables_hash,
                     &thd->handler_tables_hash, &my_charset_latin1,
                     HANDLER_TABLES_HASH_SIZE, 0, 0, mysql_ha_hash_get_key,
                     mysql_ha_hash_free, 0))
    {
      DBUG_PRINT("exit",("ERROR"));
      DBUG_RETURN(TRUE);
    }
  }
  else if (! reopen) /* Otherwise we have 'tables' already. */
  {
    if (my_hash_search(&thd->handler_tables_hash, (uchar*) tables->alias.str,
                       tables->alias.length + 1))
    {
      DBUG_PRINT("info",("duplicate '%s'", tables->alias.str));
      DBUG_PRINT("exit",("ERROR"));
      my_error(ER_NONUNIQ_TABLE, MYF(0), tables->alias.str);
      DBUG_RETURN(TRUE);
    }
  }

  /*
    Save and reset the open_tables list so that open_tables() won't
    be able to access (or know about) the previous list. And on return
    from open_tables(), thd->open_tables will contain only the opened
    table.