1 package DBIx::Class::Storage::DBI::mysql;
6 use base qw/DBIx::Class::Storage::DBI/;
10 __PACKAGE__->sql_maker_class('DBIx::Class::SQLMaker::MySQL');
11 __PACKAGE__->sql_limit_dialect ('LimitXY');
12 __PACKAGE__->sql_quote_char ('`');
14 __PACKAGE__->_use_multicolumn_in (1);
16 sub with_deferred_fk_checks {
17 my ($self, $sub) = @_;
19 $self->_do_query('SET FOREIGN_KEY_CHECKS = 0');
21 $self->_do_query('SET FOREIGN_KEY_CHECKS = 1');
24 sub connect_call_set_strict_mode {
27 # the @@sql_mode puts back what was previously set on the session handle
28 $self->_do_query(q|SET SQL_MODE = CONCAT('ANSI,TRADITIONAL,ONLY_FULL_GROUP_BY,', @@sql_mode)|);
29 $self->_do_query(q|SET SQL_AUTO_IS_NULL = 0|);
32 sub _dbh_last_insert_id {
33 my ($self, $dbh, $source, $col) = @_;
34 $dbh->{mysql_insertid};
37 sub _prep_for_execute {
39 #(my $op, $ident, $args) = @_;
41 # Only update and delete need special double-subquery treatment
42 # Insert referencing the same table (i.e. SELECT MAX(id) + 1) seems
43 # to work just fine on MySQL
44 return $self->next::method(@_) if ( $_[0] eq 'select' or $_[0] eq 'insert' );
47 # FIXME FIXME FIXME - this is a terrible, gross, incomplete, MySQL-specific
48 # hack but it works rather well for the limited amount of actual use cases
49 # which can not be done in any other way on MySQL. This allows us to fix
50 # some bugs without breaking MySQL support in the process and is also
51 # crucial for more complex things like Shadow to be usable
53 # This code is just a pre-analyzer, working in tandem with ::SQLMaker::MySQL,
54 # where the possibly-set value of {_modification_target_referenced_re} is
55 # used to demarcate which part of the final SQL to double-wrap in a subquery.
57 # This is covered extensively by "offline" tests, so when the DQ work
58 # resumes, this will get flagged. Afaik there are no AST-visitor code of that
59 # magnitude yet (Oct 2015) within DQ, so a good exercise overall.
61 # extract the source name, construct modification indicator re
62 my $sm = $self->sql_maker;
64 my $target_name = $_[1]->from;
66 if (ref $target_name) {
68 ref $target_name eq 'SCALAR'
70 $$target_name =~ /^ (?:
75 # this is just a plain-ish name, which has been literal-ed for
77 $target_name = (defined $1) ? $1 : $2;
80 # this is something very complex, perhaps a custom result source or whatnot
86 local $sm->{_modification_target_referenced_re} =
87 qr/ (?<!DELETE) [\s\)] (?: FROM | JOIN ) \s (?: \` \Q$target_name\E \` | \Q$target_name\E ) [\s\(] /xi
90 $self->next::method(@_);
93 # here may seem like an odd place to override, but this is the first
94 # method called after we are connected *and* the driver is determined
95 # ($self is reblessed). See code flow in ::Storage::DBI::_populate_dbh
96 sub _run_connection_actions {
99 # default mysql_auto_reconnect to off unless explicitly set
101 $self->_dbh->{mysql_auto_reconnect}
103 ! exists $self->_dbic_connect_attributes->{mysql_auto_reconnect}
105 $self->_dbh->{mysql_auto_reconnect} = 0;
108 $self->next::method(@_);
111 # we need to figure out what mysql version we're running
115 # it is critical to get the version *before* calling next::method
116 # otherwise the potential connect will obliterate the sql_maker
117 # next::method will populate in the _sql_maker accessor
118 my $mysql_ver = $self->_server_info->{normalized_dbms_version};
120 my $sm = $self->next::method(@_);
122 # mysql 3 does not understand a bare JOIN
123 $sm->{_default_jointype} = 'INNER' if $mysql_ver < 4;
132 sub deployment_statements {
134 my ($schema, $type, $version, $dir, $sqltargs, @rest) = @_;
139 ! exists $sqltargs->{producer_args}{mysql_version}
141 my $dver = $self->_server_info->{normalized_dbms_version}
143 $sqltargs->{producer_args}{mysql_version} = $dver;
146 $self->next::method($schema, $type, $version, $dir, $sqltargs, @rest);
149 sub _exec_svp_begin {
150 my ($self, $name) = @_;
152 $self->_dbh->do("SAVEPOINT $name");
155 sub _exec_svp_release {
156 my ($self, $name) = @_;
158 $self->_dbh->do("RELEASE SAVEPOINT $name");
161 sub _exec_svp_rollback {
162 my ($self, $name) = @_;
164 $self->_dbh->do("ROLLBACK TO SAVEPOINT $name")
168 my $status = shift->_get_dbh->selectrow_hashref('show slave status');
169 return ($status->{Slave_IO_Running} eq 'Yes') && ($status->{Slave_SQL_Running} eq 'Yes');
172 sub lag_behind_master {
173 return shift->_get_dbh->selectrow_hashref('show slave status')->{Seconds_Behind_Master};
180 DBIx::Class::Storage::DBI::mysql - Storage::DBI class implementing MySQL specifics
184 Storage::DBI autodetects the underlying MySQL database, and re-blesses the
185 C<$storage> object into this class.
187 my $schema = MyApp::Schema->connect( $dsn, $user, $pass, { on_connect_call => 'set_strict_mode' } );
191 This class implements MySQL specific bits of L<DBIx::Class::Storage::DBI>,
192 like AutoIncrement column support and savepoints. Also it augments the
193 SQL maker to support the MySQL-specific C<STRAIGHT_JOIN> join type, which
194 you can use by specifying C<< join_type => 'straight' >> in the
195 L<relationship attributes|DBIx::Class::Relationship::Base/join_type>
198 It also provides a one-stop on-connect macro C<set_strict_mode> which sets
199 session variables such that MySQL behaves more predictably as far as the
200 SQL standard is concerned.
202 =head1 STORAGE OPTIONS
204 =head2 set_strict_mode
206 Enables session-wide strict options upon connecting. Equivalent to:
210 q|SET SQL_MODE = CONCAT('ANSI,TRADITIONAL,ONLY_FULL_GROUP_BY,', @@sql_mode)|,
211 q|SET SQL_AUTO_IS_NULL = 0|,
215 =head1 FURTHER QUESTIONS?
217 Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
219 =head1 COPYRIGHT AND LICENSE
221 This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
222 by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
223 redistribute it and/or modify it under the same terms as the
224 L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.