NAME¶
DBIx::DBSchema::Column - Column objects
SYNOPSIS¶
use DBIx::DBSchema::Column;
#named params with a hashref (preferred)
$column = new DBIx::DBSchema::Column ( {
'name' => 'column_name',
'type' => 'varchar'
'null' => 'NOT NULL',
'length' => 64,
'default' => '',
'local' => '',
} );
#list
$column = new DBIx::DBSchema::Column ( $name, $sql_type, $nullability, $length, $default, $local );
$name = $column->name;
$column->name( 'name' );
$sql_type = $column->type;
$column->type( 'sql_type' );
$null = $column->null;
$column->null( 'NULL' );
$column->null( 'NOT NULL' );
$column->null( '' );
$length = $column->length;
$column->length( '10' );
$column->length( '8,2' );
$default = $column->default;
$column->default( 'Roo' );
$sql_line = $column->line;
$sql_line = $column->line($datasrc);
$sql_add_column = $column->sql_add_column;
$sql_add_column = $column->sql_add_column($datasrc);
DESCRIPTION¶
DBIx::DBSchema::Column objects represent columns in tables (see
DBIx::DBSchema::Table).
METHODS¶
- new HASHREF
- new [ name [ , type [ , null [ , length [ , default [ , local ] ] ] ] ]
]
- Creates a new DBIx::DBSchema::Column object. Takes a hashref of named
parameters, or a list. name is the name of the column. type
is the SQL data type. null is the nullability of the column
(intrepreted using Perl's rules for truth, with one exception: `NOT NULL'
is false). length is the SQL length of the column. default
is the default value of the column. local is reserved for
database-specific information.
Note: If you pass a scalar reference as the default rather than a
scalar value, it will be dereferenced and quoting will be forced off. This
can be used to pass SQL functions such as "now()" or explicit
empty strings as '' as defaults.
- name [ NAME ]
- Returns or sets the column name.
- type [ TYPE ]
- Returns or sets the column type.
- null [ NULL ]
- Returns or sets the column null flag (the empty string is equivalent to
`NOT NULL')
- length [ LENGTH ]
- Returns or sets the column length.
- default [ LOCAL ]
- Returns or sets the default value.
- local [ LOCAL ]
- Returns or sets the database-specific field.
- table_obj [ TABLE_OBJ ]
- Returns or sets the table object (see DBIx::DBSchema::Table). Typically
set internally when a column object is added to a table object.
- table_name
- Returns the table name, or the empty string if this column has not yet
been assigned to a table.
- line [ DATABASE_HANDLE | DATA_SOURCE [ USERNAME PASSWORD [ ATTR ] ] ]
- Returns an SQL column definition.
The data source can be specified by passing an open DBI database handle, or
by passing the DBI data source name, username and password.
Although the username and password are optional, it is best to call this
method with a database handle or data source including a valid username
and password - a DBI connection will be opened and the quoting and type
mapping will be more reliable.
If passed a DBI data source (or handle) such as `DBI:mysql:database' or
`DBI:Pg:dbname=database', will use syntax specific to that database
engine. Currently supported databases are MySQL and PostgreSQL.
Non-standard syntax for other engines (if applicable) may also be
supported in the future.
- quoted_default DATABASE_HANDLE
- Returns this column's default value quoted for the database.
- sql_add_column [ DBH ]
- Returns SQL to add this column to an existing table. (To create a new
table, see "sql_create_table" in DBIx::DBSchema::Table instead.)
NOTE: This interface has changed in 0.41
Returns two listrefs. The first is a list of column alteration SQL fragments
for an ALTER TABLE statement. The second is a list of full SQL statements
that should be run after the ALTER TABLE statement.
The data source can be specified by passing an open DBI database handle, or
by passing the DBI data source name, username and password.
Although the username and password are optional, it is best to call this
method with a database handle or data source including a valid username
and password - a DBI connection will be opened and the quoting and type
mapping will be more reliable.
If passed a DBI data source (or handle) such as `DBI:Pg:dbname=database',
will use PostgreSQL-specific syntax. Non-standard syntax for other engines
(if applicable) may also be supported in the future.
- sql_alter_column PROTOTYPE_COLUMN [ DATABASE_HANDLE | DATA_SOURCE [
USERNAME PASSWORD [ ATTR ] ] ]
- Returns SQL to alter this column so that it is identical to the provided
prototype column, also a DBIx::DBSchema::Column object.
NOTE: This interface has changed in 0.41
Returns two listrefs. The first is a list of column alteration SQL fragments
for an ALTER TABLE statement. The second is a list of full SQL statements
that should be run after the ALTER TABLE statement.
Optionally, the data source can be specified by passing an open DBI database
handle, or by passing the DBI data source name, username and password.
If passed a DBI data source (or handle) such as `DBI:Pg:dbname=database',
will use PostgreSQL-specific syntax. Non-standard syntax for other engines
(if applicable) may also be supported in the future.
If not passed a data source (or handle), or if there is no driver for the
specified database, will attempt to use generic SQL syntax.
- sql_drop_column [ DBH ]
- Returns SQL to drop this column from an existing table.
NOTE: This interface has changed in 0.41
Returns a list of column alteration SQL fragments for an ALTER TABLE
statement.
The optional database handle or DBI data source/username/password is not yet
used.
AUTHOR¶
Ivan Kohler <ivan-dbix-dbschema@420.am>
COPYRIGHT¶
Copyright (c) 2000-2006 Ivan Kohler Copyright (c) 2007-2013 Freeside Internet
Services, Inc. All rights reserved. This program is free software; you can
redistribute it and/or modify it under the same terms as Perl itself.
BUGS¶
The
new() method should warn that "Old-style $class creation without
named parameters is deprecated!"
Better documentation is needed for sql_add_column
sql_alter_column() has database-specific foo that should be abstracted
info DBIx::DBSchema::DBD::Pg
nullify_default option should be documented
SEE ALSO¶
DBIx::DBSchema::Table, DBIx::DBSchema, DBIx::DBSchema::DBD, DBI