Class-AlzaboWrapper
view release on metacpan or search on metacpan
Subclasses inherit a number of method from "Class::AlzaboWrapper".
Class methods
* new(...)
The "new()" method provided allows you to create new objects either
from an Alzabo row object, or from the main table's primary keys.
This method first looks to see if the parameters it was given match
the table's primary key. If they do, it attempts to create an object
using those parameters. If no primary key values are given, then it
looks for an parameter called "object", which should be an
"Alzabo::Runtime::Row" object.
Finally, if your subclass defines a "_new_row()" method, then this
will be called, with all the parameters provided to the "new()"
method. This allows you to create new objects based on other
parameters.
If your subclass defines an "_init()" method, then this will be
called after the object is created, before it is returned from the
"new()" method to the caller.
If invalid parameters are given then this method will throw a
"Class::AlzaboWrapper::Exception::Params" exception.
* create(...)
This method is used to create a new object and insert it into the
database. It simply calls the "insert()" method on the class's
associated table object. Any parameters given to this method are
passed given to the "insert()" method as its "values" parameter.
* potential(...)
This creates a new object based on a potential row, as opposed to
one in the database. Similar to the "create()" method, any
parameters passed are given to the table's "potential_row()" method
as the "values" parameter.
* Columns(...)
This is simply a shortcut to the associated table's "columns"
method. This may also be called as an object method.
* Column(...)
This is simply a shortcut to the associated table's "column" method.
This may also be called as an object method.
* Table()
This method returns the Alzabo table object associated with the
subclass. This may also be called as an object method.
* AlzaboAttributes()
Returns a list of accessor methods that were created based on the
columns in the class's associated table.
* NewCursor ($cursor)
Given an "Alzabo::Runtime::Cursor" object (either a row or join
cursor), this method returns a new "Class::AlzaboWrapper::Cursor"
object.
Object methods
* row_object()
This method returns the "Alzabo::Runtime::Row" object associated
with the given subclass object. So, for our hypothetical
"WebTalk::User" class, this would return an object representing the
underlying row from the User table.
* select() / update() / delete() / is_live()
These methods are simply passthroughs to the underlying Alzabo row
methods of the same names. You may want to subclass some of these in
order to change their behavior.
MakeColumnMethods(...)
If you call this method on your subclass, then for each column in the
associated table, a method will be created in your subclass that selects
that column's value from the underlying row for an object.
For example, if our User table contained "username" and "email" columns,
then our "WebTalk::User" object would have "username()" and "email()"
methods generated.
The "MakeColumnMethods()" method accepts a "skip" parameter which can be
either a scalar or array reference. This is a list of columns for which
methods *should not* be generated.
Class::AlzaboWrapper methods
The "Class::AlzaboWrapper" module has a method it provides:
* TableToClass($table)
Given an Alzabo table object, this method returns its associated
subclass.
Cursors
When using this module, you need to use the
"Class::AlzaboWrapper::Cursor" module to wrap Alzabo's cursor objects,
so that objects the cursor returns are of the appropriate subclass, not
plain "Alzabo::Runtime::Row" objects. The "Cursor()" method provides
some syntactic sugar for creating "Class::AlzaboWrapper::Cursor"
objects.
Attributes created by subclasses
If you want to record the accessor methods your subclass makes so they
are available via "AlzaboAttributes()", you can call the
"_RecordAttributeCreation()" method, which expects two arguments. The
first argument is the class for which the method was created and the
second is the name of the method.
SUPPORT
The Alzabo docs are conveniently located online at
http://www.alzabo.org/docs/.
There is also a mailing list. You can sign up at
http://lists.sourceforge.net/lists/listinfo/alzabo-general.
Please don't email me directly. Use the list instead so others can see
your questions.
SEE ALSO
VegGuide.Org is a site I created which actually uses this code as part
of the application. Its source is available from the web site.
COPYRIGHT
Copyright (c) 2002-2005 David Rolsky. All rights reserved. This program
is free software; you can redistribute it and/or modify it under the
same terms as Perl itself.
The full text of the license can be found in the LICENSE file included
with this module.
AUTHOR
Dave Rolsky, <autarch@urth.org>
( run in 2.040 seconds using v1.01-cache-2.11-cpan-140bd7fdf52 )