# What’s new? (since the book)

- ## $sth = $dbh->primary_key_info($cat, $schema, $table);

  - Return information about the primary keys of a table

- ##

- ## @keys = $dbh->primary_key($cat, $schema, $table);

  - Simpler way to return information about the primary keys of a table

- ##

- ## $h->trace(…)

  - Trace level 1 only shows return from first and last fetch() calls
  - Trace level 2 only shows returns from fetch() calls
  - Trace level 3 shows entry and return from fetch() calls
    - Those changes will make it easier to use lower trace levels without drowning in data

## .

Previous slide | Next slide | Back to first slide | View graphic version