Current File : C:/xampp/perl/vendor/lib/DBIx/Class/Storage/DBI/mysql.pm
package DBIx::Class::Storage::DBI::mysql;
use strict;
use warnings;
use base qw/DBIx::Class::Storage::DBI/;
use namespace::clean;
__PACKAGE__->sql_maker_class('DBIx::Class::SQLMaker::MySQL');
__PACKAGE__->sql_limit_dialect ('LimitXY');
__PACKAGE__->sql_quote_char ('`');
__PACKAGE__->_use_multicolumn_in (1);
sub with_deferred_fk_checks {
my ($self, $sub) = @_;
$self->_do_query('SET FOREIGN_KEY_CHECKS = 0');
$sub->();
$self->_do_query('SET FOREIGN_KEY_CHECKS = 1');
}
sub connect_call_set_strict_mode {
my $self = shift;
# the @@sql_mode puts back what was previously set on the session handle
$self->_do_query(q|SET SQL_MODE = CONCAT('ANSI,TRADITIONAL,ONLY_FULL_GROUP_BY,', @@sql_mode)|);
$self->_do_query(q|SET SQL_AUTO_IS_NULL = 0|);
}
sub _dbh_last_insert_id {
my ($self, $dbh, $source, $col) = @_;
$dbh->{mysql_insertid};
}
sub _prep_for_execute {
my $self = shift;
#(my $op, $ident, $args) = @_;
# Only update and delete need special double-subquery treatment
# Insert referencing the same table (i.e. SELECT MAX(id) + 1) seems
# to work just fine on MySQL
return $self->next::method(@_) if ( $_[0] eq 'select' or $_[0] eq 'insert' );
# FIXME FIXME FIXME - this is a terrible, gross, incomplete hack
# it should be trivial for mst to port this to DQ (and a good
# exercise as well, since we do not yet have such wide tree walking
# in place). For the time being this will work in limited cases,
# mainly complex update/delete, which is really all we want it for
# currently (allows us to fix some bugs without breaking MySQL in
# the process, and is also crucial for Shadow to be usable)
# extract the source name, construct modification indicator re
my $sm = $self->sql_maker;
my $target_name = $_[1]->from;
if (ref $target_name) {
if (
ref $target_name eq 'SCALAR'
and
$$target_name =~ /^ (?:
\` ( [^`]+ ) \` #`
| ( [\w\-]+ )
) $/x
) {
# this is just a plain-ish name, which has been literal-ed for
# whatever reason
$target_name = (defined $1) ? $1 : $2;
}
else {
# this is something very complex, perhaps a custom result source or whatnot
# can't deal with it
undef $target_name;
}
}
local $sm->{_modification_target_referenced_re} =
qr/ (?<!DELETE) [\s\)] (?: FROM | JOIN ) \s (?: \` \Q$target_name\E \` | \Q$target_name\E ) [\s\(] /xi
if $target_name;
$self->next::method(@_);
}
# here may seem like an odd place to override, but this is the first
# method called after we are connected *and* the driver is determined
# ($self is reblessed). See code flow in ::Storage::DBI::_populate_dbh
sub _run_connection_actions {
my $self = shift;
# default mysql_auto_reconnect to off unless explicitly set
if (
$self->_dbh->{mysql_auto_reconnect}
and
! exists $self->_dbic_connect_attributes->{mysql_auto_reconnect}
) {
$self->_dbh->{mysql_auto_reconnect} = 0;
}
$self->next::method(@_);
}
# we need to figure out what mysql version we're running
sub sql_maker {
my $self = shift;
# it is critical to get the version *before* calling next::method
# otherwise the potential connect will obliterate the sql_maker
# next::method will populate in the _sql_maker accessor
my $mysql_ver = $self->_server_info->{normalized_dbms_version};
my $sm = $self->next::method(@_);
# mysql 3 does not understand a bare JOIN
$sm->{_default_jointype} = 'INNER' if $mysql_ver < 4;
$sm;
}
sub sqlt_type {
return 'MySQL';
}
sub deployment_statements {
my $self = shift;
my ($schema, $type, $version, $dir, $sqltargs, @rest) = @_;
$sqltargs ||= {};
if (
! exists $sqltargs->{producer_args}{mysql_version}
and
my $dver = $self->_server_info->{normalized_dbms_version}
) {
$sqltargs->{producer_args}{mysql_version} = $dver;
}
$self->next::method($schema, $type, $version, $dir, $sqltargs, @rest);
}
sub _exec_svp_begin {
my ($self, $name) = @_;
$self->_dbh->do("SAVEPOINT $name");
}
sub _exec_svp_release {
my ($self, $name) = @_;
$self->_dbh->do("RELEASE SAVEPOINT $name");
}
sub _exec_svp_rollback {
my ($self, $name) = @_;
$self->_dbh->do("ROLLBACK TO SAVEPOINT $name")
}
sub is_replicating {
my $status = shift->_get_dbh->selectrow_hashref('show slave status');
return ($status->{Slave_IO_Running} eq 'Yes') && ($status->{Slave_SQL_Running} eq 'Yes');
}
sub lag_behind_master {
return shift->_get_dbh->selectrow_hashref('show slave status')->{Seconds_Behind_Master};
}
1;
=head1 NAME
DBIx::Class::Storage::DBI::mysql - Storage::DBI class implementing MySQL specifics
=head1 SYNOPSIS
Storage::DBI autodetects the underlying MySQL database, and re-blesses the
C<$storage> object into this class.
my $schema = MyApp::Schema->connect( $dsn, $user, $pass, { on_connect_call => 'set_strict_mode' } );
=head1 DESCRIPTION
This class implements MySQL specific bits of L<DBIx::Class::Storage::DBI>,
like AutoIncrement column support and savepoints. Also it augments the
SQL maker to support the MySQL-specific C<STRAIGHT_JOIN> join type, which
you can use by specifying C<< join_type => 'straight' >> in the
L<relationship attributes|DBIx::Class::Relationship::Base/join_type>
It also provides a one-stop on-connect macro C<set_strict_mode> which sets
session variables such that MySQL behaves more predictably as far as the
SQL standard is concerned.
=head1 STORAGE OPTIONS
=head2 set_strict_mode
Enables session-wide strict options upon connecting. Equivalent to:
->connect ( ... , {
on_connect_do => [
q|SET SQL_MODE = CONCAT('ANSI,TRADITIONAL,ONLY_FULL_GROUP_BY,', @@sql_mode)|,
q|SET SQL_AUTO_IS_NULL = 0|,
]
});
=head1 FURTHER QUESTIONS?
Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
=head1 COPYRIGHT AND LICENSE
This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
redistribute it and/or modify it under the same terms as the
L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.
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