1 package DBIx::Class::Storage::DBI::mysql;
6 use base qw/DBIx::Class::Storage::DBI/;
8 __PACKAGE__->sql_maker_class('DBIx::Class::SQLMaker::MySQL');
9 __PACKAGE__->sql_limit_dialect ('LimitXY');
10 __PACKAGE__->sql_quote_char ('`');
12 __PACKAGE__->_use_multicolumn_in (1);
14 sub with_deferred_fk_checks {
15 my ($self, $sub) = @_;
17 $self->_do_query('SET FOREIGN_KEY_CHECKS = 0');
19 $self->_do_query('SET FOREIGN_KEY_CHECKS = 1');
22 sub connect_call_set_strict_mode {
25 # the @@sql_mode puts back what was previously set on the session handle
26 $self->_do_query(q|SET SQL_MODE = CONCAT('ANSI,TRADITIONAL,ONLY_FULL_GROUP_BY,', @@sql_mode)|);
27 $self->_do_query(q|SET SQL_AUTO_IS_NULL = 0|);
30 sub _dbh_last_insert_id {
31 my ($self, $dbh, $source, $col) = @_;
32 $dbh->{mysql_insertid};
35 sub _prep_for_execute {
37 #(my $op, $ident, $args) = @_;
39 # Only update and delete need special double-subquery treatment
40 # Insert referencing the same table (i.e. SELECT MAX(id) + 1) seems
41 # to work just fine on MySQL
42 return $self->next::method(@_) if ( $_[0] eq 'select' or $_[0] eq 'insert' );
45 # FIXME FIXME FIXME - this is a terrible, gross, incomplete, MySQL-specific
46 # hack but it works rather well for the limited amount of actual use cases
47 # which can not be done in any other way on MySQL. This allows us to fix
48 # some bugs without breaking MySQL support in the process and is also
49 # crucial for more complex things like Shadow to be usable
51 # This code is just a pre-analyzer, working in tandem with ::SQLMaker::MySQL,
52 # where the possibly-set value of {_modification_target_referenced_re} is
53 # used to demarcate which part of the final SQL to double-wrap in a subquery.
55 # This is covered extensively by "offline" tests, so when the DQ work
56 # resumes, this will get flagged. Afaik there are no AST-visitor code of that
57 # magnitude yet (Oct 2015) within DQ, so a good exercise overall.
59 # extract the source name, construct modification indicator re
60 my $sm = $self->sql_maker;
62 my $target_name = $_[1]->from;
64 if (ref $target_name) {
66 ref $target_name eq 'SCALAR'
68 $$target_name =~ /^ (?:
73 # this is just a plain-ish name, which has been literal-ed for
75 $target_name = (defined $1) ? $1 : $2;
78 # this is something very complex, perhaps a custom result source or whatnot
84 local $sm->{_modification_target_referenced_re} =
85 qr/ (?<!DELETE) [\s\)] (?: FROM | JOIN ) \s (?: \` \Q$target_name\E \` | \Q$target_name\E ) [\s\(] /xi
88 $self->next::method(@_);
91 # here may seem like an odd place to override, but this is the first
92 # method called after we are connected *and* the driver is determined
93 # ($self is reblessed). See code flow in ::Storage::DBI::_populate_dbh
94 sub _run_connection_actions {
97 # default mysql_auto_reconnect to off unless explicitly set
99 $self->_dbh->{mysql_auto_reconnect}
101 ! exists $self->_dbic_connect_attributes->{mysql_auto_reconnect}
103 $self->_dbh->{mysql_auto_reconnect} = 0;
106 $self->next::method(@_);
109 # we need to figure out what mysql version we're running
113 # it is critical to get the version *before* calling next::method
114 # otherwise the potential connect will obliterate the sql_maker
115 # next::method will populate in the _sql_maker accessor
116 my $mysql_ver = $self->_server_info->{normalized_dbms_version};
118 my $sm = $self->next::method(@_);
120 # mysql 3 does not understand a bare JOIN
121 $sm->{_default_jointype} = 'INNER' if $mysql_ver < 4;
130 sub deployment_statements {
132 my ($schema, $type, $version, $dir, $sqltargs, @rest) = @_;
137 ! exists $sqltargs->{producer_args}{mysql_version}
139 my $dver = $self->_server_info->{normalized_dbms_version}
141 $sqltargs->{producer_args}{mysql_version} = $dver;
144 $self->next::method($schema, $type, $version, $dir, $sqltargs, @rest);
147 sub _exec_svp_begin {
148 my ($self, $name) = @_;
150 $self->_dbh->do("SAVEPOINT $name");
153 sub _exec_svp_release {
154 my ($self, $name) = @_;
156 $self->_dbh->do("RELEASE SAVEPOINT $name");
159 sub _exec_svp_rollback {
160 my ($self, $name) = @_;
162 $self->_dbh->do("ROLLBACK TO SAVEPOINT $name")
166 my $status = shift->_get_dbh->selectrow_hashref('show slave status');
167 return ($status->{Slave_IO_Running} eq 'Yes') && ($status->{Slave_SQL_Running} eq 'Yes');
170 sub lag_behind_master {
171 return shift->_get_dbh->selectrow_hashref('show slave status')->{Seconds_Behind_Master};
178 DBIx::Class::Storage::DBI::mysql - Storage::DBI class implementing MySQL specifics
182 Storage::DBI autodetects the underlying MySQL database, and re-blesses the
183 C<$storage> object into this class.
185 my $schema = MyApp::Schema->connect( $dsn, $user, $pass, { on_connect_call => 'set_strict_mode' } );
189 This class implements MySQL specific bits of L<DBIx::Class::Storage::DBI>,
190 like AutoIncrement column support and savepoints. Also it augments the
191 SQL maker to support the MySQL-specific C<STRAIGHT_JOIN> join type, which
192 you can use by specifying C<< join_type => 'straight' >> in the
193 L<relationship attributes|DBIx::Class::Relationship::Base/join_type>
196 It also provides a one-stop on-connect macro C<set_strict_mode> which sets
197 session variables such that MySQL behaves more predictably as far as the
198 SQL standard is concerned.
200 =head1 STORAGE OPTIONS
202 =head2 set_strict_mode
204 Enables session-wide strict options upon connecting. Equivalent to:
208 q|SET SQL_MODE = CONCAT('ANSI,TRADITIONAL,ONLY_FULL_GROUP_BY,', @@sql_mode)|,
209 q|SET SQL_AUTO_IS_NULL = 0|,
213 =head1 FURTHER QUESTIONS?
215 Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
217 =head1 COPYRIGHT AND LICENSE
219 This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
220 by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
221 redistribute it and/or modify it under the same terms as the
222 L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.