Alzabo::PostgreSQL(3pm) User Contributed Perl Documentation Alzabo::PostgreSQL(3pm)NAME
Alzabo::PostgreSQL - Alzabo and PostgreSQL
DESCRIPTION
This documentation is about what special support Alzabo has for PostgreSQL, as well as what is lacking.
Postgres support is based on the 7.3.x version of Postgres. Alzabo should work with the 7.1 and 7.2 series, and may even work with the 7.0
series.
Mixed-case Table or Column Names
By default, Postgres treats table and column names case-insensitively. Because of this, Alzabo always quotes these names when generating
DDL SQL. If you are using tables or columns that contain upper-case characters, you should always call "$schema->set_quote_identifiers(1)"
as soon as you load your schema object. Otherwise, any method which generates DML SQL will fail.
Reverse Engineering
o Alzabo cannot determine from the existence of a sequence that the sequence is meant to be used for a particular column unless the
sequence was created as a result of making a column's type SERIAL.
This is because there is no link between the two in the Postgres' data dictionary tables and will probably never change.
Transactions
o Transactions are fully supported with Postgres.
Outer joins
o Left and right outer joins are supported.
o Full outer joins are not supported.
Constraints
Column constraints can be specified as column attributes. Table constraints can be specified as table attributes.
Foreign key constraints are generated automatically based on the relationships defined by your schema.
perl v5.8.8 2007-12-23 Alzabo::PostgreSQL(3pm)
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Alzabo::Table(3pm) User Contributed Perl Documentation Alzabo::Table(3pm)NAME
Alzabo::Table - Table objects
SYNOPSIS
use Alzabo::Table;
my $t = $schema->table('foo');
foreach $pk ($t->primary_keys)
{
print $pk->name;
}
DESCRIPTION
Objects in this class represent tables. They contain foreign key, index, and column objects.
METHODS
schema
Returns the "Alzabo::Schema" object to which this table belongs.
name
Returns the name of the table.
column ($name)
Returns the "Alzabo::Column" object that matches the name given.
An "Alzabo::Exception::Params" exception is throws if the table does not contain the column.
columns (@optional_list_of_column_names)
If no arguments are given, returns a list of all "Alzabo::Column" objects in the schema, or in a scalar context the number of such tables.
If one or more arguments are given, returns a list of table objects with those names, in the same order given.
An "Alzabo::Exception::Params" exception is throws if the table does not contain one or more of the specified columns.
has_column ($name)
Returns a voolean value indicating whether the column exists in the table.
primary_key
In array context, return an ordered list of column objects that make up the primary key for the table. In scalar context, it returns the
first element of that list.
primary_key_size
The number of columns in the table's primary key.
column_is_primary_key ("Alzabo::Column" object)
Returns a boolean value indicating whether the column given is part of the table's primary key.
This method is really only needed if you're not sure that the column belongs to the table. Otherwise just call the "Alzabo::Col-
umn->is_primary_key" method on the column object.
attributes
A table's attributes are strings describing the table (for example, valid attributes in MySQL are thing like "TYPE = INNODB".
Returns a list of strings.
has_attribute
This method can be used to test whether or not a table has a particular attribute. By default, the check is case-insensitive.
* attribute => $attribute
* case_sensitive => 0 or 1 (defaults to 0)
Returns a boolean value indicating whether the table has this particular attribute.
foreign_keys
Thie method takes two parameters:
* column => "Alzabo::Column" object
* table => "Alzabo::Table" object
It returns a list of "Alzabo::ForeignKey" objects from the given column to the given table, if they exist. In scalar context, it returns
the first item in the list. There is no guarantee as to what the first item will be.
An "Alzabo::Exception::Params" exception is throws if the table does not contain the specified column.
foreign_keys_by_table ("Alzabo::Table" object)
Returns a list of all the "Alzabo::ForeignKey" objects to the given table. In scalar context, it returns the first item in the list.
There is no guarantee as to what the first item will be.
foreign_keys_by_column ("Alzabo::Column" object)
Returns a list of all the "Alzabo::ForeignKey" objects that the given column is a part of, if any. In scalar context, it returns the first
item in the list. There is no guarantee as to what the first item will be.
An "Alzabo::Exception::Params" exception is throws if the table does not contain the specified column.
all_foreign_keys
Returns a list of all the "Alzabo::ForeignKey" objects for this table. In scalar context, it returns the first item in the list. There is
no guarantee as to what the first item will be.
index ($index_id)
This method expects an index id as returned by the "Alzabo::Index->id" method as its parameter.
The "Alzabo::Index" object matching this id, if it exists in the table.
An "Alzabo::Exception::Params" exception is throws if the table does not contain the specified index.
has_index ($index_id)
This method expects an index id as returned by the "Alzabo::Index->id" method as its parameter.
Returns a boolean indicating whether the table has an index with the same id.
indexes
Returns all the "Alzabo::Index" objects for the table.
comment
Returns the comment associated with the table object, if any.
AUTHOR
Dave Rolsky, <autarch@urth.org>
perl v5.8.8 2007-12-23 Alzabo::Table(3pm)