NAME¶
DBIx::Class::SQLMaker - An SQL::Abstract-based SQL maker class
DESCRIPTION¶
This module is a subclass of SQL::Abstract and includes a number of
DBIC-specific workarounds, not yet suitable for inclusion into the
SQL::Abstract core. It also provides all (and more than) the functionality of
SQL::Abstract::Limit, see DBIx::Class::SQLMaker::LimitDialects for more info.
Currently the enhancements to SQL::Abstract are:
- •
- Support for "JOIN" statements (via extended
"table/from" support)
- •
- Support of functions in "SELECT" lists
- •
- "GROUP BY"/"HAVING" support (via
extensions to the order_by parameter)
- •
- Support of "...FOR UPDATE" type of select
statement modifiers
- •
- The "-ident" operator
- •
- The "-value" operator
OPERATORS¶
-ident¶
Used to explicitly specify an SQL identifier. Takes a plain string as value
which is then invariably treated as a column name (and is being properly
quoted if quoting has been requested). Most useful for comparison of two
columns:
my %where = (
priority => { '<', 2 },
requestor => { -ident => 'submitter' }
);
which results in:
$stmt = 'WHERE "priority" < ? AND "requestor" = "submitter"';
@bind = ('2');
-value¶
The -value operator signals that the argument to the right is a raw bind value.
It will be passed straight to DBI, without invoking any of the SQL::Abstract
condition-parsing logic. This allows you to, for example, pass an array as a
column value for databases that support array datatypes, e.g.:
my %where = (
array => { -value => [1, 2, 3] }
);
which results in:
$stmt = 'WHERE array = ?';
@bind = ([1, 2, 3]);
AUTHORS¶
See "CONTRIBUTORS" in DBIx::Class.
LICENSE¶
You may distribute this code under the same terms as Perl itself.