Sets an attribute on the database handle. Some of the available generic attributes are listed below; some drivers may make use of additional driver specific attributes.
PDO::ATTR_CASE: Force column names to a specific case.
PDO::CASE_LOWER: Force column names to lower case.
PDO::CASE_NATURAL: Leave column names as returned by the database driver.
PDO::CASE_UPPER: Force column names to upper case.