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Displaying posts with tag: mysql plugins (reset)

Analysing WHER-clauses in INFORMATION_SCHEMA table implemtations
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The MySQL Server has a quite simple interface for plugins to create tables inside INFORMATION_SCHEMA. A minimal plugin for creating a table with nothing but a counter might look like this:

static int counter_fill_table(THD *thd, TABLE_LIST *tables, Item *cond)
{
  ulonglong value= 0;
  
  while (1)
  {
    table->field[0]->store(value++, true);
  }
  
  return 0;
}

static ST_FIELD_INFO counter_table_fields[]=
{
  {"COUNT", 20, MYSQL_TYPE_LONGLONG, 0, MY_I_S_UNSIGNED, 0, 0},
  {0, 0, MYSQL_TYPE_NULL, 0, 0, 0, 0}
};

static int counter_table_init(void *ptr)
{
  ST_SCHEMA_TABLE *schema_table= (ST_SCHEMA_TABLE*)ptr;

  schema_table->fields_info= counter_table_fields;
  schema_table->fill_table= counter_fill_table;
  return 0;
}

static struct st_mysql_information_schema counter_table_info =
{
  [Read more...]
Showing entries 1 to 1

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