DBIx::Class::BatchUpdate - Update batches of DBIC rows with as few queries as possible
# In your result class, e.g. MySchema::ResultSet::Book
__PACKAGE__->load_components("BatchUpdate");
# In your code, update loads of row objects and keep track of them
$book_row1->is_out_of_print(1);
$book_row2->is_out_of_print(1);
$book_row3->is_out_of_print(1);
$book_row3->price(42);
my $book_rows = [ $book_row1, $book_row2, $book_row3 ];
# Batch update all rows in as few UPDATE statements as possible
$schema->resultset("Book")->batch_update($book_rows);
# SQL queries
# 1 UPDATE for all the rows with is_out_of_print: 1
# 1 UPDATE for all the rows with is_out_of_print: 1, price: 42
# Alternatively, create your own BatchUpdate::Update object:
use DBIx::Class::BatchUpdate::Update;
DBIx::Class::BatchUpdate::Update->new({
rows => $rows,
})->update();This module is for when you have loads of DBIC rows to update as part of some large scale processing, and you want to avoid making individual calls to $row->update for each of them. If the number of dirty rows is large, the many round-trips to the database will be quite time consuming.
So instead of calling $row->update you collect all the dirty row objects (of the same Result class) for later and then let DBIx::Class::BatchUpdate update the database with as few queries as possible.
This means that if the same columns have been set to the same value in all the rows, this will be done in a single query. The more different combinations of columns and values there are in rows, the more queries are required.
See DBIx::Class::BatchUpdate on metacpan.org