NAME

       Alzabo::Runtime::Column - Column objects

SYNOPSIS

         use Alzabo::Runtime::Column;

DESCRIPTION

       This object represents a column.  It holds data specific to a column.

INHERITS FROM

       "Alzabo::Column"

       Note: all relevant documentation from the superclass has been merged into this document.

METHODS

   table
       Returns the table object to which this column belongs.

   name
       Returns the column's name as a string.

   nullable
       Returns a boolean value indicating whether or not NULLs are allowed in this column.

   attributes
       A column's attributes are strings describing the column (for example, valid attributes in
       MySQL are 'UNSIGNED' or 'ZEROFILL'.

       This method returns a list of strings of such strings.

   has_attribute
       This method can be used to test whether or not a column has a particular attribute.  By
       default, the check is case-insensitive.

       It takes the following parameters:

       •   attribute => $attribute

       •   case_sensitive => 0 or 1 (defaults to 0)

       It returns a boolean value indicating whether or not the column has this particular
       attribute.

   type
       Returns the column's type as a string.

   sequenced
       The meaning of a sequenced column varies from one RDBMS to another.  In those with
       sequences, it means that a sequence is created and that values for this column will be
       drawn from it for inserts into this table.  In databases without sequences, the nearest
       analog for a sequence is used (in MySQL the column is given the AUTO_INCREMENT attribute,
       in Sybase the identity attribute).

       In general, this only has meaning for the primary key column of a table with a single
       column primary key.  Setting the column as sequenced means its value never has to be
       provided to when calling "Alzabo::Runtime::Table->insert".

       Returns a boolean value indicating whether or not this column is sequenced.

   default
       Returns the default value of the column as a string, or undef if there is no default.

   default_is_raw
       Returns true if the default is intended to be provided to the DBMS as-is, without quoting,
       fore example "NOW()" or "current_timestamp".

   length
       Returns the length attribute of the column, or undef if there is none.

   precision
       Returns the precision attribute of the column, or undef if there is none.

   is_primary_key
       Returns a boolean value indicating whether or not this column is part of its table's
       primary key.

   is_numeric
       Returns a boolean value indicating whether the column is a numeric type column.

   is_integer
       Returns a boolean value indicating whether the column is a numeric type column.

   is_floating_point
       Returns a boolean value indicating whether the column is a numeric type column.

   is_character
       Returns a boolean value indicating whether the column is a character type column.

       This is true only for any columns which are defined to hold text data, regardless of size.

   is_date
       Returns a boolean value indicating whether the column is a date type column.

   is_datetime
       Returns a boolean value indicating whether the column is a datetime type column.

   is_time
       Returns a boolean value indicating whether the column is a time type column.

   is_time_interval
       Returns a boolean value indicating whether the column is a time interval type column.

   is_blob
       Returns a boolean value indicating whether the column is a blob column.

       This is true for any columns defined to hold binary data, regardless of size.

   generic_type
       This methods returns one of the following strings:

       integer
       floating_point
       character
       date
       datetime
       time
       blob
       unknown

   definition
       The definition object is very rarely of interest.  Use the "type()" method if you are only
       interested in the column's type.

       This methods returns the "Alzabo::Runtime::ColumnDefinition" object which holds this
       column's type information.

   comment
       Returns the comment associated with the column object, if any.

   alias
       Takes the following parameters:

       •   as => $name

       This method returns an object that can be used in calls to the table and schema "select()"
       methods in order to change the name given to the column if "next_as_hash()" is called on
       the "Alzabo::DriverStatement" returned by the aforementioned "select()" method.

AUTHOR

       Dave Rolsky, <autarch@urth.org>