现在我们有一个大型 perl 应用程序,它使用原始 DBI 连接到 MySQL 并执行 SQL 语句。它每次都会创建一个连接并终止。开始接近mysql的连接限制(一次200)
看起来像 DBIx::Connection支持应用层连接池。
有人对 DBIx::Connection
有任何经验吗?连接池还有其他注意事项吗?
我还看到了 mod_dbd
,它是一个 Apache 模块,看起来像是处理连接池。
http://httpd.apache.org/docs/2.1/mod/mod_dbd.html
最佳答案
我对 DBIx::Connection 没有任何经验,但我使用 DBIx::Connector (本质上是 DBIx::Class 在内部使用的东西,但是是内联的)而且它很棒......
我将这些连接与 Moose 对象包装器汇集在一起,如果连接参数相同(这对任何底层 DB 对象都一样),该包装器会返回现有对象实例:
package MyApp::Factory::DatabaseConnection;
use strict;
use warnings;
use Moose;
# table of database name -> connection objects
has connection_pool => (
is => 'ro', isa => 'HashRef[DBIx::Connector]',
traits => ['Hash'],
handles => {
has_pooled_connection => 'exists',
get_pooled_connection => 'get',
save_pooled_connection => 'set',
},
default => sub { {} },
);
sub get_connection
{
my ($self, %options) = @_;
# some application-specific parsing of %options here...
my $obj;
if ($options{reuse})
{
# extract the last-allocated connection for this database and pass it
# back, if there is one.
$obj = $self->get_pooled_connection($options{database});
}
if (not $obj or not $obj->connected)
{
# look up connection info based on requested database name
my ($dsn, $username, $password) = $self->get_connection_info($options{database});
$obj = DBIx::Connector->new($dsn, $username, $password);
return unless $obj;
# Save this connection for later reuse, possibly replacing an earlier
# saved connection (this latest one has the highest chance of being in
# the same pid as a subsequent request).
$self->save_pooled_connection($options{database}, $obj) unless $options{nosave};
}
return $obj;
}
关于mysql - Perl 连接池,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3267591/