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DBSchema::Column(3) |
User Contributed Perl Documentation |
DBSchema::Column(3) |
DBIx::DBSchema::Column - Column objects
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);
DBIx::DBSchema::Column objects represent columns in tables (see
DBIx::DBSchema::Table).
- 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.
Ivan Kohler <ivan-dbix-dbschema@420.am>
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.
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
DBIx::DBSchema::Table, DBIx::DBSchema, DBIx::DBSchema::DBD, DBI
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