%PDF- %PDF-
Direktori : C:/xampp/perl/vendor/lib/DBIx/Class/Storage/DBI/ |
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>.