Alzabo::Runtime::Column - Column objects

  use Alzabo::Runtime::Column;

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

CWAlzabo::Column

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

Returns the table object to which this column belongs.

Returns the column's name as a string.

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

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.

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:

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

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

Returns the column's type as a string.

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 CWAlzabo::Runtime::Table->insert.

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

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

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

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

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

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

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

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

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.

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

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

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

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

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.

This methods returns one of the following strings:

integer

floating_point

character

date

datetime

time

blob

unknown

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

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

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

Takes the following parameters:

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

Dave Rolsky, <autarch@urth.org>