Method open

sql/ha_sequence.cc:81–137

*/

int ha_sequence::open(const char *name, int mode, uint flags)
{
  int error;
  DBUG_ENTER("ha_sequence::open");
  DBUG_ASSERT(table->s == table_share && file);

  file->table= table;
  file->option_struct= option_struct;
  if (likely(!(error= file->open(name, mode, flags))))
  {
    /*
      Allocate ref in table's mem_root. We can't use table's ref
      as it's allocated by ha_ caller that allocates this.
     */
    ref_length= file->ref_length;
    if (!(ref= (uchar*) alloc_root(&table->mem_root,ALIGN_SIZE(ref_length)*2)))
    {
      file->ha_close();
      error=HA_ERR_OUT_OF_MEM;
      DBUG_RETURN(error);
    }
    file->ref= ref;
    file->dup_ref= dup_ref= ref+ALIGN_SIZE(file->ref_length);

    /*
      ha_open() sets the following for us. We have to set this for the
      underlying handler
    */
    file->cached_table_flags= (file->table_flags() | HA_REUSES_FILE_NAMES);

    file->reset_statistics();
    internal_tmp_table= file->internal_tmp_table=
      MY_TEST(flags & HA_OPEN_INTERNAL_TABLE);
    reset_statistics();

    /*
      Don't try to read the initial row if the call is part of CREATE, REPAIR
      or FLUSH
    */
    if (!(flags & (HA_OPEN_FOR_CREATE | HA_OPEN_FOR_REPAIR |
                   HA_OPEN_FOR_FLUSH)))
    {
      if (unlikely((error= table->s->sequence->read_initial_values(table))))
        file->ha_close();
    }
    else if (!table->s->tmp_table)
      table->internal_set_needs_reopen(true);

    /*
      The following is needed to fix comparison of rows in
      ha_update_first_row() for InnoDB
    */
    if (!error)
      memcpy(table->record[1], table->s->default_values, table->s->reclength);
  }
  DBUG_RETURN(error);
}