SYNOPSIS
use SQL::Translator::Schema::Constraint;
my $constraint = SQL::Translator::Schema::Constraint->new(
name => 'foo',
fields => [ id ],
type => PRIMARY_KEY,
);
DESCRIPTION
"SQL::Translator::Schema::Constraint" is the constraint object.METHODS
new
Object constructor.
my $schema = SQL::Translator::Schema::Constraint->new(
table => $table, # table to which it belongs
type => 'foreign_key', # type of table constraint
name => 'fk_phone_id', # name of the constraint
fields => 'phone_id', # field in the referring table
reference_fields => 'phone_id', # referenced field
reference_table => 'phone', # referenced table
match_type => 'full', # how to match
on_delete => 'cascade', # what to do on deletes
on_update => '', # what to do on updates
);
deferrable
Get or set whether the constraint is deferrable. If not defined, then returns ``1.'' The argument is evaluated by Perl for True or False, so the following are equivalent:
$deferrable = $field->deferrable(0);
$deferrable = $field->deferrable('');
$deferrable = $field->deferrable('0');
expression
Gets and set the expression used in a CHECK constraint.
my $expression = $constraint->expression('...');
is_valid
Determine whether the constraint is valid or not.
my $ok = $constraint->is_valid;
fields
Gets and set the fields the constraint is on. Accepts a string, list or arrayref; returns an array or array reference. Will unique the field names and keep them in order by the first occurrence of a field name.The fields are returned as Field objects if they exist or as plain names if not. (If you just want the names and want to avoid the Field's overload magic use ``field_names'').
Returns undef or an empty list if the constraint has no fields set.
$constraint->fields('id');
$constraint->fields('id', 'name');
$constraint->fields( 'id, name' );
$constraint->fields( [ 'id', 'name' ] );
$constraint->fields( qw[ id name ] );
my @fields = $constraint->fields;
field_names
Read-only method to return a list or array ref of the field names. Returns undef or an empty list if the constraint has no fields set. Useful if you want to avoid the overload magic of the Field objects returned by the fields method.
my @names = $constraint->field_names;
match_type
Get or set the constraint's match_type. Only valid values are ``full'' ``partial'' and ``simple''
my $match_type = $constraint->match_type('FULL');
name
Get or set the constraint's name.
my $name = $constraint->name('foo');
options
Gets or adds to the constraints's options (e.g., ``INITIALLY IMMEDIATE''). Returns an array or array reference.
$constraint->options('NORELY');
my @options = $constraint->options;
on_delete
Get or set the constraint's ``on delete'' action.
my $action = $constraint->on_delete('cascade');
on_update
Get or set the constraint's ``on update'' action.
my $action = $constraint->on_update('no action');
reference_fields
Gets and set the fields in the referred table. Accepts a string, list or arrayref; returns an array or array reference.
$constraint->reference_fields('id');
$constraint->reference_fields('id', 'name');
$constraint->reference_fields( 'id, name' );
$constraint->reference_fields( [ 'id', 'name' ] );
$constraint->reference_fields( qw[ id name ] );
my @reference_fields = $constraint->reference_fields;
reference_table
Get or set the table referred to by the constraint.
my $reference_table = $constraint->reference_table('foo');
table
Get or set the constraint's table object.
my $table = $field->table;
type
Get or set the constraint's type.
my $type = $constraint->type( PRIMARY_KEY );
equals
Determines if this constraint is the same as another
my $isIdentical = $constraint1->equals( $constraint2 );