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 hack
48 # it should be trivial for mst to port this to DQ (and a good
49 # exercise as well, since we do not yet have such wide tree walking
50 # in place). For the time being this will work in limited cases,
51 # mainly complex update/delete, which is really all we want it for
52 # currently (allows us to fix some bugs without breaking MySQL in
53 # the process, and is also crucial for Shadow to be usable)
55 # extract the source name, construct modification indicator re
56 my $sm = $self->sql_maker;
58 my $target_name = $_[1]->from;
60 if (ref $target_name) {
62 ref $target_name eq 'SCALAR'
64 $$target_name =~ /^ (?:
69 # this is just a plain-ish name, which has been literal-ed for
71 $target_name = (defined $1) ? $1 : $2;
74 # this is something very complex, perhaps a custom result source or whatnot
80 local $sm->{_modification_target_referenced_re} =
81 qr/ (?<!DELETE) [\s\)] (?: FROM | JOIN ) \s (?: \` \Q$target_name\E \` | \Q$target_name\E ) [\s\(] /xi
84 $self->next::method(@_);
87 # here may seem like an odd place to override, but this is the first
88 # method called after we are connected *and* the driver is determined
89 # ($self is reblessed). See code flow in ::Storage::DBI::_populate_dbh
90 sub _run_connection_actions {
93 # default mysql_auto_reconnect to off unless explicitly set
95 $self->_dbh->{mysql_auto_reconnect}
97 ! exists $self->_dbic_connect_attributes->{mysql_auto_reconnect}
99 $self->_dbh->{mysql_auto_reconnect} = 0;
102 $self->next::method(@_);
105 # we need to figure out what mysql version we're running
109 # it is critical to get the version *before* calling next::method
110 # otherwise the potential connect will obliterate the sql_maker
111 # next::method will populate in the _sql_maker accessor
112 my $mysql_ver = $self->_server_info->{normalized_dbms_version};
114 my $sm = $self->next::method(@_);
116 # mysql 3 does not understand a bare JOIN
117 $sm->{_default_jointype} = 'INNER' if $mysql_ver < 4;
126 sub deployment_statements {
128 my ($schema, $type, $version, $dir, $sqltargs, @rest) = @_;
133 ! exists $sqltargs->{producer_args}{mysql_version}
135 my $dver = $self->_server_info->{normalized_dbms_version}
137 $sqltargs->{producer_args}{mysql_version} = $dver;
140 $self->next::method($schema, $type, $version, $dir, $sqltargs, @rest);
143 sub _exec_svp_begin {
144 my ($self, $name) = @_;
146 $self->_dbh->do("SAVEPOINT $name");
149 sub _exec_svp_release {
150 my ($self, $name) = @_;
152 $self->_dbh->do("RELEASE SAVEPOINT $name");
155 sub _exec_svp_rollback {
156 my ($self, $name) = @_;
158 $self->_dbh->do("ROLLBACK TO SAVEPOINT $name")
162 my $status = shift->_get_dbh->selectrow_hashref('show slave status');
163 return ($status->{Slave_IO_Running} eq 'Yes') && ($status->{Slave_SQL_Running} eq 'Yes');
166 sub lag_behind_master {
167 return shift->_get_dbh->selectrow_hashref('show slave status')->{Seconds_Behind_Master};
174 DBIx::Class::Storage::DBI::mysql - Storage::DBI class implementing MySQL specifics
178 Storage::DBI autodetects the underlying MySQL database, and re-blesses the
179 C<$storage> object into this class.
181 my $schema = MyApp::Schema->connect( $dsn, $user, $pass, { on_connect_call => 'set_strict_mode' } );
185 This class implements MySQL specific bits of L<DBIx::Class::Storage::DBI>,
186 like AutoIncrement column support and savepoints. Also it augments the
187 SQL maker to support the MySQL-specific C<STRAIGHT_JOIN> join type, which
188 you can use by specifying C<< join_type => 'straight' >> in the
189 L<relationship attributes|DBIx::Class::Relationship::Base/join_type>
192 It also provides a one-stop on-connect macro C<set_strict_mode> which sets
193 session variables such that MySQL behaves more predictably as far as the
194 SQL standard is concerned.
196 =head1 STORAGE OPTIONS
198 =head2 set_strict_mode
200 Enables session-wide strict options upon connecting. Equivalent to:
204 q|SET SQL_MODE = CONCAT('ANSI,TRADITIONAL,ONLY_FULL_GROUP_BY,', @@sql_mode)|,
205 q|SET SQL_AUTO_IS_NULL = 0|,
209 =head1 FURTHER QUESTIONS?
211 Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
213 =head1 COPYRIGHT AND LICENSE
215 This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
216 by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
217 redistribute it and/or modify it under the same terms as the
218 L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.