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=over 4

=item * load_from_file

=for html_docs type=class

Load an existing schema object from disk.  Returns a new schema
object.

=for html_docs link=L<More|Alzabo::Create::Schema/load_from_file($name)>

=item * set_user ($user)

=for html_docs type=object

Set the username to be used when connecting to the database.

=for html_docs link=L<More|Alzabo::Runtime::Schema/set_user ($user)>

=item * set_password ($password)

=for html_docs type=object

Set the password to be used when connecting to the database.

=for html_docs link=L<More|Alzabo::Runtime::Schema/set_password ($password)>

=item * set_host ($host)

=for html_docs type=object

Set the host to be used when connecting to the database.

=for html_docs link=L<More|Alzabo::Runtime::Schema/set_host ($host)>

=item * connect (%params)

=for html_docs type=object

Connect to the RDBMS.  This will use the previously set
username/password/host, though these can be overridden by the
C<%params> given to the call.

B<Important>: This method must be called before any data retrieval is
attempted.

=for html_docs link=L<More|Alzabo::Runtime::Schema/connect (%params)>

=item * join

=for html_docs type=object

Fetch rows from one or more tables based on a table join.  Returns
either a L<C<Alzabo::Runtime::RowCursor>|Alzabo::Runtime::RowCursor>
or L<C<Alzabo::Runtime::JoinCursor>|Alzabo::Runtime::JoinCursor>
object.

=for html_docs link=L<More|Alzabo::Runtime::Schema/join>

=item * function/select

=for html_docs type=object

Allows you to execute arbitrary column aggregate SQL functions such as
C<AVG> or C<MAX> with a multi-table join.

=for html_docs link=L<More|Alzabo::Runtime::Schema/function and select>

=item * table ($name)

=for html_docs type=object

Returns an L<C<Alzabo::Runtime::Table>|Alzabo::Runtime::Table> object.
This is important because most of the row fetching operations are
table object methods.

=for html_docs link=L<More|Alzabo::Runtime::Schema/table ($name)>

=back

=head3 Alzabo::Runtime::Table

Objects in this class have methods allowing you to insert new rows as
well as retrieving exist data in the form of
L<C<Alzabo::Runtime::Row>|Alzabo::Runtime::Row> or
L<C<Alzabo::Runtime::RowCursor>|Alzabo::Runtime::RowCursor> objects.

All methods that return a single row return an
L<C<Alzabo::Runtime::Row>|Alzabo::Runtime::Row> object.

All methods that return multiple rows return an
L<C<Alzabo::Runtime::RowCursor>|Alzabo::Runtime::RowCursor> object.

All methods that return rows can be given the C<no_cache> parameter,
which ensures that the row(s) returned will not be cached.  Rows
obtained in this manner should not be updated or deleted, as this will
play havoc with the caching system.  See the
L<C<Alzabo::Runtime::Row>|Alzabo::Runtime::Row> documentation for more
details.

All methods that return multiple rows in the form of a cursor object
can take an C<order_by> parameter.  See the
L<C<Alzabo::Runtime::Table>|Alzabo::Runtime::Table> documentation for
more details.

=over 4

=item * insert

=for html_docs type=object

Insert a new row and return it.

=for html_docs link=L<More|Alzabo::Runtime::Table/insert>

=item * row_by_pk

=for html_docs type=object

Returns the row identified by the primary key give.

=for html_docs link=L<More|Alzabo::Runtime::Table/row_by_pk>

=item * rows_where

=for html_docs type=object

Retrieves a set of rows based on a where clause.  Please see the
method documentation for details on how where clauses are constructed.

=for html_docs link=L<More|Alzabo::Runtime::Table/rows_where>

=item * all_rows

=for html_docs type=object

Retrieves all the rows in the table.

=for html_docs link=L<More|Alzabo::Runtime::Table/all_rows>

=item * function/select

=for html_docs type=object

Allows you to execute arbitrary column aggregate SQL functions such as
C<AVG> or C<MAX>.

=for html_docs link=L<More|Alzabo::Runtime::Table/function and select>

=item * potential_row

=for html_docs type=object

Make a new L<C<Alzabo::Runtime::Row>|Alzabo::Runtime::Row> in the
"potential" state.

=for html_docs link=L<More|Alzabo::Runtime::Table/potential_row>

=back

=head3 Alzabo::Runtime::Row

Objects in this class represent a single row of data.  You can
retrieve the actual column values from it, update it, or delete it.

=over 4

=item * select (@list_of_column_names)

=for html_docs type=object

Given a list of column names, this method returns the values for those
columns.

=for html_docs link=L<More|Alzabo::Runtime::Row/select (@list_of_column_names)>

=item * update (%hash_of_columns_and_values)

=for html_docs type=object

Given a hash of columns and values, this method will update the
database and the object to match those values.

=for html_docs link=L<More|Alzabo::Runtime::Row/update (%hash_of_columns_and_values)>

=item * delete

=for html_docs type=object

Deletes the row from the database.  Further attempts to retrieve data
from this row will throw an exception.

=for html_docs link=L<More|Alzabo::Runtime::Row/delete>

=item * rows_by_foreign_key

=for html_docs type=object

Given a foreign key object from the row's table to another table,
returns either an L<C<Alzabo::Runtime::Row>|Alzabo::Runtime::Row>
object or an
L<C<Alzabo::Runtime::RowCursor>|Alzabo::Runtime::RowCursor> object for
the row(s) in the table to which the relationship exists, based on the
value of the relevant column(s) in the current row.

This method can also take a C<no_cache> and/or C<order_by> parameter.

=for html_docs link=L<More|Alzabo::Runtime::Row/rows_by_foreign_key>

=back

=head3 Alzabo::Runtime::RowCursor

Objects in this class are used to return multiple rows as a cursor,
rather than as a list.  This is much more efficient, at the expense of
a few extra lines in your code.

=over 4

=item * next

=for html_docs type=object

Returns the next L<C<Alzabo::Runtime::Row>|Alzabo::Runtime::Row>
object, or undef if there are no more.

=for html_docs link=L<More|Alzabo::Runtime::RowCursor/next>

=item * all_rows

=for html_docs type=object

Returns a list of all the remaining
L<C<Alzabo::Runtime::Row>|Alzabo::Runtime::Row> objects, or an empty
list if there are no more.