package DBIx::Class::Storage::DBI;
# -*- mode: cperl; cperl-indent-level: 2 -*-
+use strict;
+use warnings;
+
use base 'DBIx::Class::Storage';
+use mro 'c3';
-use strict;
-use warnings;
use Carp::Clan qw/^DBIx::Class/;
use DBI;
-use SQL::Abstract::Limit;
use DBIx::Class::Storage::DBI::Cursor;
use DBIx::Class::Storage::Statistics;
-use Scalar::Util qw/blessed weaken/;
+use Scalar::Util();
+use List::Util();
__PACKAGE__->mk_group_accessors('simple' =>
- qw/_connect_info _dbi_connect_info _dbh _sql_maker _sql_maker_opts
- _conn_pid _conn_tid disable_sth_caching on_connect_do
- on_disconnect_do transaction_depth unsafe _dbh_autocommit
- auto_savepoint savepoints/
+ qw/_connect_info _dbi_connect_info _dbh _sql_maker _sql_maker_opts _conn_pid
+ _conn_tid transaction_depth _dbh_autocommit _driver_determined savepoints/
);
+# the values for these accessors are picked out (and deleted) from
+# the attribute hashref passed to connect_info
+my @storage_options = qw/
+ on_connect_call on_disconnect_call on_connect_do on_disconnect_do
+ disable_sth_caching unsafe auto_savepoint
+/;
+__PACKAGE__->mk_group_accessors('simple' => @storage_options);
+
+
+# default cursor class, overridable in connect_info attributes
__PACKAGE__->cursor_class('DBIx::Class::Storage::DBI::Cursor');
__PACKAGE__->mk_group_accessors('inherited' => qw/sql_maker_class/);
-__PACKAGE__->sql_maker_class('DBIC::SQL::Abstract');
+__PACKAGE__->sql_maker_class('DBIx::Class::SQLAHacks');
-BEGIN {
-package # Hide from PAUSE
- DBIC::SQL::Abstract; # Would merge upstream, but nate doesn't reply :(
+=head1 NAME
-use base qw/SQL::Abstract::Limit/;
+DBIx::Class::Storage::DBI - DBI storage handler
-# This prevents the caching of $dbh in S::A::L, I believe
-sub new {
- my $self = shift->SUPER::new(@_);
+=head1 SYNOPSIS
- # If limit_dialect is a ref (like a $dbh), go ahead and replace
- # it with what it resolves to:
- $self->{limit_dialect} = $self->_find_syntax($self->{limit_dialect})
- if ref $self->{limit_dialect};
+ my $schema = MySchema->connect('dbi:SQLite:my.db');
- $self;
-}
+ $schema->storage->debug(1);
+ $schema->dbh_do("DROP TABLE authors");
-sub _RowNumberOver {
- my ($self, $sql, $order, $rows, $offset ) = @_;
+ $schema->resultset('Book')->search({
+ written_on => $schema->storage->datetime_parser(DateTime->now)
+ });
- $offset += 1;
- my $last = $rows + $offset;
- my ( $order_by ) = $self->_order_by( $order );
+=head1 DESCRIPTION
- $sql = <<"";
-SELECT * FROM
-(
- SELECT Q1.*, ROW_NUMBER() OVER( ) AS ROW_NUM FROM (
- $sql
- $order_by
- ) Q1
-) Q2
-WHERE ROW_NUM BETWEEN $offset AND $last
+This class represents the connection to an RDBMS via L<DBI>. See
+L<DBIx::Class::Storage> for general information. This pod only
+documents DBI-specific methods and behaviors.
- return $sql;
-}
+=head1 METHODS
+=cut
-# While we're at it, this should make LIMIT queries more efficient,
-# without digging into things too deeply
-use Scalar::Util 'blessed';
-sub _find_syntax {
- my ($self, $syntax) = @_;
- my $dbhname = blessed($syntax) ? $syntax->{Driver}{Name} : $syntax;
- if(ref($self) && $dbhname && $dbhname eq 'DB2') {
- return 'RowNumberOver';
- }
+sub new {
+ my $new = shift->next::method(@_);
- $self->{_cached_syntax} ||= $self->SUPER::_find_syntax($syntax);
-}
+ $new->transaction_depth(0);
+ $new->_sql_maker_opts({});
+ $new->{savepoints} = [];
+ $new->{_in_dbh_do} = 0;
+ $new->{_dbh_gen} = 0;
-sub select {
- my ($self, $table, $fields, $where, $order, @rest) = @_;
- $table = $self->_quote($table) unless ref($table);
- local $self->{rownum_hack_count} = 1
- if (defined $rest[0] && $self->{limit_dialect} eq 'RowNum');
- @rest = (-1) unless defined $rest[0];
- die "LIMIT 0 Does Not Compute" if $rest[0] == 0;
- # and anyway, SQL::Abstract::Limit will cause a barf if we don't first
- local $self->{having_bind} = [];
- my ($sql, @ret) = $self->SUPER::select(
- $table, $self->_recurse_fields($fields), $where, $order, @rest
- );
- $sql .=
- $self->{for} ?
- (
- $self->{for} eq 'update' ? ' FOR UPDATE' :
- $self->{for} eq 'shared' ? ' FOR SHARE' :
- ''
- ) :
- ''
- ;
- return wantarray ? ($sql, @ret, @{$self->{having_bind}}) : $sql;
+ $new;
}
-sub insert {
- my $self = shift;
- my $table = shift;
- $table = $self->_quote($table) unless ref($table);
- $self->SUPER::insert($table, @_);
-}
+=head2 connect_info
-sub update {
- my $self = shift;
- my $table = shift;
- $table = $self->_quote($table) unless ref($table);
- $self->SUPER::update($table, @_);
-}
+This method is normally called by L<DBIx::Class::Schema/connection>, which
+encapsulates its argument list in an arrayref before passing them here.
-sub delete {
- my $self = shift;
- my $table = shift;
- $table = $self->_quote($table) unless ref($table);
- $self->SUPER::delete($table, @_);
-}
+The argument list may contain:
-sub _emulate_limit {
- my $self = shift;
- if ($_[3] == -1) {
- return $_[1].$self->_order_by($_[2]);
- } else {
- return $self->SUPER::_emulate_limit(@_);
- }
-}
+=over
-sub _recurse_fields {
- my ($self, $fields, $params) = @_;
- my $ref = ref $fields;
- return $self->_quote($fields) unless $ref;
- return $$fields if $ref eq 'SCALAR';
-
- if ($ref eq 'ARRAY') {
- return join(', ', map {
- $self->_recurse_fields($_)
- .(exists $self->{rownum_hack_count} && !($params && $params->{no_rownum_hack})
- ? ' AS col'.$self->{rownum_hack_count}++
- : '')
- } @$fields);
- } elsif ($ref eq 'HASH') {
- foreach my $func (keys %$fields) {
- return $self->_sqlcase($func)
- .'( '.$self->_recurse_fields($fields->{$func}).' )';
- }
- }
-}
+=item *
-sub _order_by {
- my $self = shift;
- my $ret = '';
- my @extra;
- if (ref $_[0] eq 'HASH') {
- if (defined $_[0]->{group_by}) {
- $ret = $self->_sqlcase(' group by ')
- .$self->_recurse_fields($_[0]->{group_by}, { no_rownum_hack => 1 });
- }
- if (defined $_[0]->{having}) {
- my $frag;
- ($frag, @extra) = $self->_recurse_where($_[0]->{having});
- push(@{$self->{having_bind}}, @extra);
- $ret .= $self->_sqlcase(' having ').$frag;
- }
- if (defined $_[0]->{order_by}) {
- $ret .= $self->_order_by($_[0]->{order_by});
- }
- } elsif (ref $_[0] eq 'SCALAR') {
- $ret = $self->_sqlcase(' order by ').${ $_[0] };
- } elsif (ref $_[0] eq 'ARRAY' && @{$_[0]}) {
- my @order = @{+shift};
- $ret = $self->_sqlcase(' order by ')
- .join(', ', map {
- my $r = $self->_order_by($_, @_);
- $r =~ s/^ ?ORDER BY //i;
- $r;
- } @order);
- } else {
- $ret = $self->SUPER::_order_by(@_);
- }
- return $ret;
-}
+The same 4-element argument set one would normally pass to
+L<DBI/connect>, optionally followed by
+L<extra attributes|/DBIx::Class specific connection attributes>
+recognized by DBIx::Class:
-sub _order_directions {
- my ($self, $order) = @_;
- $order = $order->{order_by} if ref $order eq 'HASH';
- return $self->SUPER::_order_directions($order);
-}
+ $connect_info_args = [ $dsn, $user, $password, \%dbi_attributes?, \%extra_attributes? ];
-sub _table {
- my ($self, $from) = @_;
- if (ref $from eq 'ARRAY') {
- return $self->_recurse_from(@$from);
- } elsif (ref $from eq 'HASH') {
- return $self->_make_as($from);
- } else {
- return $from; # would love to quote here but _table ends up getting called
- # twice during an ->select without a limit clause due to
- # the way S::A::Limit->select works. should maybe consider
- # bypassing this and doing S::A::select($self, ...) in
- # our select method above. meantime, quoting shims have
- # been added to select/insert/update/delete here
- }
-}
+=item *
-sub _recurse_from {
- my ($self, $from, @join) = @_;
- my @sqlf;
- push(@sqlf, $self->_make_as($from));
- foreach my $j (@join) {
- my ($to, $on) = @$j;
+A single code reference which returns a connected
+L<DBI database handle|DBI/connect> optionally followed by
+L<extra attributes|/DBIx::Class specific connection attributes> recognized
+by DBIx::Class:
- # check whether a join type exists
- my $join_clause = '';
- my $to_jt = ref($to) eq 'ARRAY' ? $to->[0] : $to;
- if (ref($to_jt) eq 'HASH' and exists($to_jt->{-join_type})) {
- $join_clause = ' '.uc($to_jt->{-join_type}).' JOIN ';
- } else {
- $join_clause = ' JOIN ';
- }
- push(@sqlf, $join_clause);
+ $connect_info_args = [ sub { DBI->connect (...) }, \%extra_attributes? ];
- if (ref $to eq 'ARRAY') {
- push(@sqlf, '(', $self->_recurse_from(@$to), ')');
- } else {
- push(@sqlf, $self->_make_as($to));
- }
- push(@sqlf, ' ON ', $self->_join_condition($on));
- }
- return join('', @sqlf);
-}
-
-sub _make_as {
- my ($self, $from) = @_;
- return join(' ', map { (ref $_ eq 'SCALAR' ? $$_ : $self->_quote($_)) }
- reverse each %{$self->_skip_options($from)});
-}
-
-sub _skip_options {
- my ($self, $hash) = @_;
- my $clean_hash = {};
- $clean_hash->{$_} = $hash->{$_}
- for grep {!/^-/} keys %$hash;
- return $clean_hash;
-}
-
-sub _join_condition {
- my ($self, $cond) = @_;
- if (ref $cond eq 'HASH') {
- my %j;
- for (keys %$cond) {
- my $v = $cond->{$_};
- if (ref $v) {
- # XXX no throw_exception() in this package and croak() fails with strange results
- Carp::croak(ref($v) . qq{ reference arguments are not supported in JOINS - try using \"..." instead'})
- if ref($v) ne 'SCALAR';
- $j{$_} = $v;
- }
- else {
- my $x = '= '.$self->_quote($v); $j{$_} = \$x;
- }
- };
- return scalar($self->_recurse_where(\%j));
- } elsif (ref $cond eq 'ARRAY') {
- return join(' OR ', map { $self->_join_condition($_) } @$cond);
- } else {
- die "Can't handle this yet!";
- }
-}
+=item *
-sub _quote {
- my ($self, $label) = @_;
- return '' unless defined $label;
- return "*" if $label eq '*';
- return $label unless $self->{quote_char};
- if(ref $self->{quote_char} eq "ARRAY"){
- return $self->{quote_char}->[0] . $label . $self->{quote_char}->[1]
- if !defined $self->{name_sep};
- my $sep = $self->{name_sep};
- return join($self->{name_sep},
- map { $self->{quote_char}->[0] . $_ . $self->{quote_char}->[1] }
- split(/\Q$sep\E/,$label));
- }
- return $self->SUPER::_quote($label);
-}
+A single hashref with all the attributes and the dsn/user/password
+mixed together:
-sub limit_dialect {
- my $self = shift;
- $self->{limit_dialect} = shift if @_;
- return $self->{limit_dialect};
-}
+ $connect_info_args = [{
+ dsn => $dsn,
+ user => $user,
+ password => $pass,
+ %dbi_attributes,
+ %extra_attributes,
+ }];
-sub quote_char {
- my $self = shift;
- $self->{quote_char} = shift if @_;
- return $self->{quote_char};
-}
+This is particularly useful for L<Catalyst> based applications, allowing the
+following config (L<Config::General> style):
-sub name_sep {
- my $self = shift;
- $self->{name_sep} = shift if @_;
- return $self->{name_sep};
-}
+ <Model::DB>
+ schema_class App::DB
+ <connect_info>
+ dsn dbi:mysql:database=test
+ user testuser
+ password TestPass
+ AutoCommit 1
+ </connect_info>
+ </Model::DB>
-} # End of BEGIN block
+=back
-=head1 NAME
+Please note that the L<DBI> docs recommend that you always explicitly
+set C<AutoCommit> to either I<0> or I<1>. L<DBIx::Class> further
+recommends that it be set to I<1>, and that you perform transactions
+via our L<DBIx::Class::Schema/txn_do> method. L<DBIx::Class> will set it
+to I<1> if you do not do explicitly set it to zero. This is the default
+for most DBDs. See L</DBIx::Class and AutoCommit> for details.
-DBIx::Class::Storage::DBI - DBI storage handler
+=head3 DBIx::Class specific connection attributes
-=head1 SYNOPSIS
+In addition to the standard L<DBI|DBI/ATTRIBUTES_COMMON_TO_ALL_HANDLES>
+L<connection|DBI/Database_Handle_Attributes> attributes, DBIx::Class recognizes
+the following connection options. These options can be mixed in with your other
+L<DBI> connection attributes, or placed in a seperate hashref
+(C<\%extra_attributes>) as shown above.
-=head1 DESCRIPTION
+Every time C<connect_info> is invoked, any previous settings for
+these options will be cleared before setting the new ones, regardless of
+whether any options are specified in the new C<connect_info>.
-This class represents the connection to an RDBMS via L<DBI>. See
-L<DBIx::Class::Storage> for general information. This pod only
-documents DBI-specific methods and behaviors.
-=head1 METHODS
+=over
-=cut
+=item on_connect_do
-sub new {
- my $new = shift->next::method(@_);
+Specifies things to do immediately after connecting or re-connecting to
+the database. Its value may contain:
- $new->transaction_depth(0);
- $new->_sql_maker_opts({});
- $new->{savepoints} = [];
- $new->{_in_dbh_do} = 0;
- $new->{_dbh_gen} = 0;
+=over
- $new;
-}
+=item a scalar
-=head2 connect_info
+This contains one SQL statement to execute.
-The arguments of C<connect_info> are always a single array reference.
+=item an array reference
-This is normally accessed via L<DBIx::Class::Schema/connection>, which
-encapsulates its argument list in an arrayref before calling
-C<connect_info> here.
+This contains SQL statements to execute in order. Each element contains
+a string or a code reference that returns a string.
-The arrayref can either contain the same set of arguments one would
-normally pass to L<DBI/connect>, or a lone code reference which returns
-a connected database handle. Please note that the L<DBI> docs
-recommend that you always explicitly set C<AutoCommit> to either
-C<0> or C<1>. L<DBIx::Class> further recommends that it be set
-to C<1>, and that you perform transactions via our L</txn_do>
-method. L<DBIx::Class> will set it to C<1> if you do not do explicitly
-set it to zero. This is the default for most DBDs. See below for more
-details.
+=item a code reference
-In either case, if the final argument in your connect_info happens
-to be a hashref, C<connect_info> will look there for several
-connection-specific options:
+This contains some code to execute. Unlike code references within an
+array reference, its return value is ignored.
-=over 4
+=back
-=item on_connect_do
+=item on_disconnect_do
-Specifies things to do immediately after connecting or re-connecting to
-the database. Its value may contain:
+Takes arguments in the same form as L</on_connect_do> and executes them
+immediately before disconnecting from the database.
+
+Note, this only runs if you explicitly call L</disconnect> on the
+storage object.
+
+=item on_connect_call
+
+A more generalized form of L</on_connect_do> that calls the specified
+C<connect_call_METHOD> methods in your storage driver.
+
+ on_connect_do => 'select 1'
+
+is equivalent to:
+
+ on_connect_call => [ [ do_sql => 'select 1' ] ]
+
+Its values may contain:
=over
+=item a scalar
+
+Will call the C<connect_call_METHOD> method.
+
+=item a code reference
+
+Will execute C<< $code->($storage) >>
+
=item an array reference
-This contains SQL statements to execute in order. Each element contains
-a string or a code reference that returns a string.
+Each value can be a method name or code reference.
+
+=item an array of arrays
+
+For each array, the first item is taken to be the C<connect_call_> method name
+or code reference, and the rest are parameters to it.
+
+=back
+
+Some predefined storage methods you may use:
+
+=over
+
+=item do_sql
+
+Executes a SQL string or a code reference that returns a SQL string. This is
+what L</on_connect_do> and L</on_disconnect_do> use.
+
+It can take:
+
+=over
+
+=item a scalar
+
+Will execute the scalar as SQL.
+
+=item an arrayref
+
+Taken to be arguments to L<DBI/do>, the SQL string optionally followed by the
+attributes hashref and bind values.
=item a code reference
-This contains some code to execute. Unlike code references within an
-array reference, its return value is ignored.
+Will execute C<< $code->($storage) >> and execute the return array refs as
+above.
=back
-=item on_disconnect_do
+=item datetime_setup
+
+Execute any statements necessary to initialize the database session to return
+and accept datetime/timestamp values used with
+L<DBIx::Class::InflateColumn::DateTime>.
-Takes arguments in the same form as L<on_connect_do> and executes them
+Only necessary for some databases, see your specific storage driver for
+implementation details.
+
+=back
+
+=item on_disconnect_call
+
+Takes arguments in the same form as L</on_connect_call> and executes them
immediately before disconnecting from the database.
-Note, this only runs if you explicitly call L<disconnect> on the
+Calls the C<disconnect_call_METHOD> methods as opposed to the
+C<connect_call_METHOD> methods called by L</on_connect_call>.
+
+Note, this only runs if you explicitly call L</disconnect> on the
storage object.
=item disable_sth_caching
If set to a true value, this option will disable the caching of
statement handles via L<DBI/prepare_cached>.
-=item limit_dialect
+=item limit_dialect
Sets the limit dialect. This is useful for JDBC-bridge among others
where the remote SQL-dialect cannot be determined by the name of the
-driver alone.
+driver alone. See also L<SQL::Abstract::Limit>.
=item quote_char
-Specifies what characters to use to quote table and column names. If
-you use this you will want to specify L<name_sep> as well.
+Specifies what characters to use to quote table and column names. If
+you use this you will want to specify L</name_sep> as well.
-quote_char expects either a single character, in which case is it is placed
-on either side of the table/column, or an arrayref of length 2 in which case the
-table/column name is placed between the elements.
+C<quote_char> expects either a single character, in which case is it
+is placed on either side of the table/column name, or an arrayref of length
+2 in which case the table/column name is placed between the elements.
-For example under MySQL you'd use C<quote_char =E<gt> '`'>, and user SQL Server you'd
-use C<quote_char =E<gt> [qw/[ ]/]>.
+For example under MySQL you should use C<< quote_char => '`' >>, and for
+SQL Server you should use C<< quote_char => [qw/[ ]/] >>.
=item name_sep
-This only needs to be used in conjunction with L<quote_char>, and is used to
-specify the charecter that seperates elements (schemas, tables, columns) from
+This only needs to be used in conjunction with C<quote_char>, and is used to
+specify the charecter that seperates elements (schemas, tables, columns) from
each other. In most cases this is simply a C<.>.
+The consequences of not supplying this value is that L<SQL::Abstract>
+will assume DBIx::Class' uses of aliases to be complete column
+names. The output will look like I<"me.name"> when it should actually
+be I<"me"."name">.
+
=item unsafe
This Storage driver normally installs its own C<HandleError>, sets
transactions, making it possible to recover from failure in the inner
transaction without having to abort all outer transactions.
-=back
-
-These options can be mixed in with your other L<DBI> connection attributes,
-or placed in a seperate hashref after all other normal L<DBI> connection
-arguments.
+=item cursor_class
-Every time C<connect_info> is invoked, any previous settings for
-these options will be cleared before setting the new ones, regardless of
-whether any options are specified in the new C<connect_info>.
-
-Another Important Note:
-
-DBIC can do some wonderful magic with handling exceptions,
-disconnections, and transactions when you use C<< AutoCommit => 1 >>
-combined with C<txn_do> for transaction support.
+Use this argument to supply a cursor class other than the default
+L<DBIx::Class::Storage::DBI::Cursor>.
-If you set C<< AutoCommit => 0 >> in your connect info, then you are always
-in an assumed transaction between commits, and you're telling us you'd
-like to manage that manually. A lot of DBIC's magic protections
-go away. We can't protect you from exceptions due to database
-disconnects because we don't know anything about how to restart your
-transactions. You're on your own for handling all sorts of exceptional
-cases if you choose the C<< AutoCommit => 0 >> path, just as you would
-be with raw DBI.
+=back
-Examples:
+Some real-life examples of arguments to L</connect_info> and
+L<DBIx::Class::Schema/connect>
# Simple SQLite connection
->connect_info([ 'dbi:SQLite:./foo.db' ]);
]
);
- # Subref + DBIC-specific connection options
+ # Same, but with hashref as argument
+ # See parse_connect_info for explanation
+ ->connect_info(
+ [{
+ dsn => 'dbi:Pg:dbname=foo',
+ user => 'postgres',
+ password => 'my_pg_password',
+ AutoCommit => 1,
+ quote_char => q{"},
+ name_sep => q{.},
+ }]
+ );
+
+ # Subref + DBIx::Class-specific connection options
->connect_info(
[
sub { DBI->connect(...) },
]
);
+
+
=cut
sub connect_info {
return $self->_connect_info if !$info_arg;
+ my @args = @$info_arg; # take a shallow copy for further mutilation
+ $self->_connect_info([@args]); # copy for _connect_info
+
+
+ # combine/pre-parse arguments depending on invocation style
+
+ my %attrs;
+ if (ref $args[0] eq 'CODE') { # coderef with optional \%extra_attributes
+ %attrs = %{ $args[1] || {} };
+ @args = $args[0];
+ }
+ elsif (ref $args[0] eq 'HASH') { # single hashref (i.e. Catalyst config)
+ %attrs = %{$args[0]};
+ @args = ();
+ for (qw/password user dsn/) {
+ unshift @args, delete $attrs{$_};
+ }
+ }
+ else { # otherwise assume dsn/user/password + \%attrs + \%extra_attrs
+ %attrs = (
+ % { $args[3] || {} },
+ % { $args[4] || {} },
+ );
+ @args = @args[0,1,2];
+ }
+
# Kill sql_maker/_sql_maker_opts, so we get a fresh one with only
# the new set of options
$self->_sql_maker(undef);
$self->_sql_maker_opts({});
- $self->_connect_info([@$info_arg]); # copy for _connect_info
- my $dbi_info = [@$info_arg]; # copy for _dbi_connect_info
-
- my $last_info = $dbi_info->[-1];
- if(ref $last_info eq 'HASH') {
- $last_info = { %$last_info }; # so delete is non-destructive
- my @storage_option = qw(
- on_connect_do on_disconnect_do disable_sth_caching unsafe cursor_class
- auto_savepoint
- );
- for my $storage_opt (@storage_option) {
- if(my $value = delete $last_info->{$storage_opt}) {
+ if(keys %attrs) {
+ for my $storage_opt (@storage_options, 'cursor_class') { # @storage_options is declared at the top of the module
+ if(my $value = delete $attrs{$storage_opt}) {
$self->$storage_opt($value);
}
}
for my $sql_maker_opt (qw/limit_dialect quote_char name_sep/) {
- if(my $opt_val = delete $last_info->{$sql_maker_opt}) {
+ if(my $opt_val = delete $attrs{$sql_maker_opt}) {
$self->_sql_maker_opts->{$sql_maker_opt} = $opt_val;
}
}
- # re-insert modified hashref
- $dbi_info->[-1] = $last_info;
+ }
- # Get rid of any trailing empty hashref
- pop(@$dbi_info) if !keys %$last_info;
+ if (ref $args[0] eq 'CODE') {
+ # _connect() never looks past $args[0] in this case
+ %attrs = ()
+ } else {
+ %attrs = (
+ %{ $self->_default_dbi_connect_attributes || {} },
+ %attrs,
+ );
}
- $self->_dbi_connect_info($dbi_info);
+ $self->_dbi_connect_info([@args, keys %attrs ? \%attrs : ()]);
$self->_connect_info;
}
+sub _default_dbi_connect_attributes {
+ return { AutoCommit => 1 };
+}
+
=head2 on_connect_do
-This method is deprecated in favor of setting via L</connect_info>.
+This method is deprecated in favour of setting via L</connect_info>.
+
+=cut
+
+=head2 on_disconnect_do
+
+This method is deprecated in favour of setting via L</connect_info>.
+
+=cut
+
+sub _parse_connect_do {
+ my ($self, $type) = @_;
+
+ my $val = $self->$type;
+ return () if not defined $val;
+
+ my @res;
+
+ if (not ref($val)) {
+ push @res, [ 'do_sql', $val ];
+ } elsif (ref($val) eq 'CODE') {
+ push @res, $val;
+ } elsif (ref($val) eq 'ARRAY') {
+ push @res, map { [ 'do_sql', $_ ] } @$val;
+ } else {
+ $self->throw_exception("Invalid type for $type: ".ref($val));
+ }
+
+ return \@res;
+}
=head2 dbh_do
local $self->{_in_dbh_do} = 1;
+ $self->_do_with_reconnect($code, @_);
+}
+
+sub _do_with_reconnect {
+ my $self = shift;
+ my $code = shift;
my @result;
my $want_array = wantarray;
+ my $dbh = $self->_dbh;
eval {
$self->_verify_pid if $dbh;
sub disconnect {
my ($self) = @_;
- if( $self->connected ) {
- my $connection_do = $self->on_disconnect_do;
- $self->_do_connection_actions($connection_do) if ref($connection_do);
+ if( $self->_dbh ) {
+ my @actions;
+
+ push @actions, ( $self->on_disconnect_call || () );
+ push @actions, $self->_parse_connect_do ('on_disconnect_do');
+
+ $self->_do_connection_actions(disconnect_call_ => $_) for @actions;
$self->_dbh->rollback unless $self->_dbh_autocommit;
$self->_dbh->disconnect;
}
}
+=head2 with_deferred_fk_checks
+
+=over 4
+
+=item Arguments: C<$coderef>
+
+=item Return Value: The return value of $coderef
+
+=back
+
+Storage specific method to run the code ref with FK checks deferred or
+in MySQL's case disabled entirely.
+
+=cut
+
+# Storage subclasses should override this
+sub with_deferred_fk_checks {
+ my ($self, $sub) = @_;
+
+ $sub->();
+}
+
+=head2 connected
+
+=over
+
+=item Arguments: none
+
+=item Return Value: 1|0
+
+=back
+
+Verifies that the the current database handle is active and ready to execute
+an SQL statement (i.e. the connection did not get stale, server is still
+answering, etc.) This method is used internally by L</dbh>.
+
+=cut
+
sub connected {
my ($self) = @_;
$self->_verify_pid;
return 0 if !$self->_dbh;
}
- return ($dbh->FETCH('Active') && $dbh->ping);
+ return ($dbh->FETCH('Active') && $self->_ping);
}
return 0;
}
+sub _ping {
+ my $self = shift;
+
+ my $dbh = $self->_dbh or return 0;
+
+ return $dbh->ping;
+}
+
# handle pid changes correctly
# NOTE: assumes $self->_dbh is a valid $dbh
sub _verify_pid {
=head2 dbh
-Returns the dbh - a data base handle of class L<DBI>.
+Returns a C<$dbh> - a data base handle of class L<DBI>. The returned handle
+is guaranteed to be healthy by implicitly calling L</connected>, and if
+necessary performing a reconnection before returning.
=cut
sub dbh {
my ($self) = @_;
- $self->ensure_connected;
+ if (not $self->_dbh) {
+ $self->_populate_dbh;
+ } else {
+ $self->ensure_connected;
+ }
+ return $self->_dbh;
+}
+
+=head2 last_dbh
+
+This returns the B<last> available C<$dbh> if any, or attempts to
+connect and returns the resulting handle. This method differs from
+L</dbh> by not validating if a preexisting handle is still healthy
+via L</connected>. Make sure you take appropriate precautions
+when using this method, as the C<$dbh> may be useless at this point.
+
+=cut
+
+sub last_dbh {
+ my $self = shift;
+ $self->_populate_dbh unless $self->_dbh;
return $self->_dbh;
}
sub _sql_maker_args {
my ($self) = @_;
-
- return ( bindtype=>'columns', limit_dialect => $self->dbh, %{$self->_sql_maker_opts} );
+
+ return (
+ bindtype=>'columns',
+ array_datatypes => 1,
+ limit_dialect => $self->last_dbh,
+ %{$self->_sql_maker_opts}
+ );
}
sub sql_maker {
my ($self) = @_;
unless ($self->_sql_maker) {
my $sql_maker_class = $self->sql_maker_class;
+ $self->ensure_class_loaded ($sql_maker_class);
$self->_sql_maker($sql_maker_class->new( $self->_sql_maker_args ));
}
return $self->_sql_maker;
sub _populate_dbh {
my ($self) = @_;
+
my @info = @{$self->_dbi_connect_info || []};
$self->_dbh($self->_connect(@info));
+ $self->_conn_pid($$);
+ $self->_conn_tid(threads->tid) if $INC{'threads.pm'};
+
+ $self->_determine_driver;
+
# Always set the transaction depth on connect, since
# there is no transaction in progress by definition
$self->{transaction_depth} = $self->_dbh_autocommit ? 0 : 1;
- if(ref $self eq 'DBIx::Class::Storage::DBI') {
- my $driver = $self->_dbh->{Driver}->{Name};
- if ($self->load_optional_class("DBIx::Class::Storage::DBI::${driver}")) {
- bless $self, "DBIx::Class::Storage::DBI::${driver}";
- $self->_rebless();
+ $self->_run_connection_actions unless $self->{_in_determine_driver};
+}
+
+sub _run_connection_actions {
+ my $self = shift;
+ my @actions;
+
+ push @actions, ( $self->on_connect_call || () );
+ push @actions, $self->_parse_connect_do ('on_connect_do');
+
+ $self->_do_connection_actions(connect_call_ => $_) for @actions;
+}
+
+sub _determine_driver {
+ my ($self) = @_;
+
+ if (not $self->_driver_determined) {
+ my $started_unconnected = 0;
+ local $self->{_in_determine_driver} = 1;
+
+ if (ref($self) eq __PACKAGE__) {
+ my $driver;
+ if ($self->_dbh) { # we are connected
+ $driver = $self->_dbh->{Driver}{Name};
+ } else {
+ # try to use dsn to not require being connected, the driver may still
+ # force a connection in _rebless to determine version
+ ($driver) = $self->_dbi_connect_info->[0] =~ /dbi:([^:]+):/i;
+ $started_unconnected = 1;
+ }
+
+ my $storage_class = "DBIx::Class::Storage::DBI::${driver}";
+ if ($self->load_optional_class($storage_class)) {
+ mro::set_mro($storage_class, 'c3');
+ bless $self, $storage_class;
+ $self->_rebless();
+ }
}
+
+ $self->_driver_determined(1);
+
+ $self->_run_connection_actions
+ if $started_unconnected && defined $self->_dbh;
}
+}
- my $connection_do = $self->on_connect_do;
- $self->_do_connection_actions($connection_do) if ref($connection_do);
+sub _do_connection_actions {
+ my $self = shift;
+ my $method_prefix = shift;
+ my $call = shift;
+
+ if (not ref($call)) {
+ my $method = $method_prefix . $call;
+ $self->$method(@_);
+ } elsif (ref($call) eq 'CODE') {
+ $self->$call(@_);
+ } elsif (ref($call) eq 'ARRAY') {
+ if (ref($call->[0]) ne 'ARRAY') {
+ $self->_do_connection_actions($method_prefix, $_) for @$call;
+ } else {
+ $self->_do_connection_actions($method_prefix, @$_) for @$call;
+ }
+ } else {
+ $self->throw_exception (sprintf ("Don't know how to process conection actions of type '%s'", ref($call)) );
+ }
- $self->_conn_pid($$);
- $self->_conn_tid(threads->tid) if $INC{'threads.pm'};
+ return $self;
}
-sub _do_connection_actions {
+sub connect_call_do_sql {
my $self = shift;
- my $connection_do = shift;
-
- if (ref $connection_do eq 'ARRAY') {
- $self->_do_query($_) foreach @$connection_do;
- }
- elsif (ref $connection_do eq 'CODE') {
- $connection_do->();
- }
+ $self->_do_query(@_);
+}
- return $self;
+sub disconnect_call_do_sql {
+ my $self = shift;
+ $self->_do_query(@_);
}
+# override in db-specific backend when necessary
+sub connect_call_datetime_setup { 1 }
+
sub _do_query {
my ($self, $action) = @_;
$self->_do_query($_) foreach @$action;
}
else {
- my @to_run = (ref $action eq 'ARRAY') ? (@$action) : ($action);
- $self->_query_start(@to_run);
- $self->_dbh->do(@to_run);
- $self->_query_end(@to_run);
+ # Most debuggers expect ($sql, @bind), so we need to exclude
+ # the attribute hash which is the second argument to $dbh->do
+ # furthermore the bind values are usually to be presented
+ # as named arrayref pairs, so wrap those here too
+ my @do_args = (ref $action eq 'ARRAY') ? (@$action) : ($action);
+ my $sql = shift @do_args;
+ my $attrs = shift @do_args;
+ my @bind = map { [ undef, $_ ] } @do_args;
+
+ $self->_query_start($sql, @bind);
+ $self->_dbh->do($sql, $attrs, @do_args);
+ $self->_query_end($sql, @bind);
}
return $self;
if($dbh && !$self->unsafe) {
my $weak_self = $self;
- weaken($weak_self);
+ Scalar::Util::weaken($weak_self);
$dbh->{HandleError} = sub {
- $weak_self->throw_exception("DBI Exception: $_[0]")
+ if ($weak_self) {
+ $weak_self->throw_exception("DBI Exception: $_[0]");
+ }
+ else {
+ croak ("DBI Exception: $_[0]");
+ }
};
$dbh->{ShowErrorStatement} = 1;
$dbh->{RaiseError} = 1;
$self->throw_exception ("Your Storage implementation doesn't support savepoints")
unless $self->can('_svp_begin');
-
+
push @{ $self->{savepoints} }, $name;
$self->debugobj->svp_begin($name) if $self->debug;
-
+
return $self->_svp_begin($name);
}
}
$self->debugobj->svp_rollback($name) if $self->debug;
-
+
return $self->_svp_rollback($name);
}
sub txn_begin {
my $self = shift;
- $self->ensure_connected();
if($self->{transaction_depth} == 0) {
$self->debugobj->txn_begin()
if $self->debug;
# this isn't ->_dbh-> because
# we should reconnect on begin_work
# for AutoCommit users
- $self->dbh->begin_work;
+ $self->_do_with_reconnect(sub { $_[1]->begin_work });
} elsif ($self->auto_savepoint) {
$self->svp_begin;
}
sub _prep_for_execute {
my ($self, $op, $extra_bind, $ident, $args) = @_;
+ if( Scalar::Util::blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
+ $ident = $ident->from();
+ }
+
my ($sql, @bind) = $self->sql_maker->$op($ident, @$args);
+
unshift(@bind,
map { ref $_ eq 'ARRAY' ? $_ : [ '!!dummy', $_ ] } @$extra_bind)
if $extra_bind;
-
return ($sql, \@bind);
}
+
sub _fix_bind_params {
my ($self, @bind) = @_;
if ( $self->debug ) {
@bind = $self->_fix_bind_params(@bind);
-
+
$self->debugobj->query_start( $sql, @bind );
}
}
sub _dbh_execute {
my ($self, $dbh, $op, $extra_bind, $ident, $bind_attributes, @args) = @_;
-
- if( blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
- $ident = $ident->from();
- }
my ($sql, $bind) = $self->_prep_for_execute($op, $extra_bind, $ident, \@args);
my $sth = $self->sth($sql,$op);
- my $placeholder_index = 1;
+ my $placeholder_index = 1;
foreach my $bound (@$bind) {
my $attributes = {};
}
foreach my $data (@data) {
- $data = ref $data ? ''.$data : $data; # stringify args
+ my $ref = ref $data;
+ $data = $ref && $ref ne 'ARRAY' ? ''.$data : $data; # stringify args (except arrayrefs)
$sth->bind_param($placeholder_index, $data, $attributes);
$placeholder_index++;
sub insert {
my ($self, $source, $to_insert) = @_;
-
- my $ident = $source->from;
+
+# redispatch to insert method of storage we reblessed into, if necessary
+ if (not $self->_driver_determined) {
+ $self->_determine_driver;
+ goto $self->can('insert');
+ }
+
+ my $ident = $source->from;
my $bind_attributes = $self->source_bind_attributes($source);
+ my $updated_cols = {};
+
foreach my $col ( $source->columns ) {
if ( !defined $to_insert->{$col} ) {
my $col_info = $source->column_info($col);
if ( $col_info->{auto_nextval} ) {
- $self->ensure_connected;
- $to_insert->{$col} = $self->_sequence_fetch( 'nextval', $col_info->{sequence} || $self->_dbh_get_autoinc_seq($self->dbh, $source) );
+ $updated_cols->{$col} = $to_insert->{$col} = $self->_sequence_fetch(
+ 'nextval',
+ $col_info->{sequence} ||
+ $self->_dbh_get_autoinc_seq($self->last_dbh, $source)
+ );
}
}
}
$self->_execute('insert' => [], $source, $bind_attributes, $to_insert);
- return $to_insert;
+ return $updated_cols;
}
## Still not quite perfect, and EXPERIMENTAL
-## Currently it is assumed that all values passed will be "normal", i.e. not
+## Currently it is assumed that all values passed will be "normal", i.e. not
## scalar refs, or at least, all the same type as the first set, the statement is
## only prepped once.
sub insert_bulk {
my $table = $source->from;
@colvalues{@$cols} = (0..$#$cols);
my ($sql, @bind) = $self->sql_maker->insert($table, \%colvalues);
-
+
+ $self->_determine_driver;
+
$self->_query_start( $sql, @bind );
my $sth = $self->sth($sql);
# @bind = map { ref $_ ? ''.$_ : $_ } @bind; # stringify args
## This must be an arrayref, else nothing works!
-
my $tuple_status = [];
-
- ##use Data::Dumper;
- ##print STDERR Dumper( $data, $sql, [@bind] );
-
- my $time = time();
## Get the bind_attributes, if any exist
my $bind_attributes = $self->source_bind_attributes($source);
## Bind the values and execute
- my $placeholder_index = 1;
+ my $placeholder_index = 1;
foreach my $bound (@bind) {
$sth->bind_param_array( $placeholder_index, [@data], $attributes );
$placeholder_index++;
}
- my $rv = $sth->execute_array({ArrayTupleStatus => $tuple_status});
+ my $rv = eval { $sth->execute_array({ArrayTupleStatus => $tuple_status}) };
+ if (my $err = $@) {
+ my $i = 0;
+ ++$i while $i <= $#$tuple_status && !ref $tuple_status->[$i];
+
+ $self->throw_exception($sth->errstr || "Unexpected populate error: $err")
+ if ($i > $#$tuple_status);
+
+ require Data::Dumper;
+ local $Data::Dumper::Terse = 1;
+ local $Data::Dumper::Indent = 1;
+ local $Data::Dumper::Useqq = 1;
+ local $Data::Dumper::Quotekeys = 0;
+
+ $self->throw_exception(sprintf "%s for populate slice:\n%s",
+ $tuple_status->[$i][1],
+ Data::Dumper::Dumper(
+ { map { $cols->[$_] => $data->[$i][$_] } (0 .. $#$cols) }
+ ),
+ );
+ }
$self->throw_exception($sth->errstr) if !$rv;
$self->_query_end( $sql, @bind );
sub update {
my $self = shift @_;
my $source = shift @_;
+ $self->_determine_driver;
my $bind_attributes = $self->source_bind_attributes($source);
-
+
return $self->_execute('update' => [], $source, $bind_attributes, @_);
}
sub delete {
my $self = shift @_;
my $source = shift @_;
-
- my $bind_attrs = {}; ## If ever it's needed...
-
+ $self->_determine_driver;
+ my $bind_attrs = $self->source_bind_attributes($source);
+
return $self->_execute('delete' => [], $source, $bind_attrs, @_);
}
-sub _select {
- my ($self, $ident, $select, $condition, $attrs) = @_;
- my $order = $attrs->{order_by};
+# We were sent here because the $rs contains a complex search
+# which will require a subquery to select the correct rows
+# (i.e. joined or limited resultsets)
+#
+# Genarating a single PK column subquery is trivial and supported
+# by all RDBMS. However if we have a multicolumn PK, things get ugly.
+# Look at _multipk_update_delete()
+sub _subq_update_delete {
+ my $self = shift;
+ my ($rs, $op, $values) = @_;
+
+ my $rsrc = $rs->result_source;
+
+ # we already check this, but double check naively just in case. Should be removed soon
+ my $sel = $rs->_resolved_attrs->{select};
+ $sel = [ $sel ] unless ref $sel eq 'ARRAY';
+ my @pcols = $rsrc->primary_columns;
+ if (@$sel != @pcols) {
+ $self->throw_exception (
+ 'Subquery update/delete can not be called on resultsets selecting a'
+ .' number of columns different than the number of primary keys'
+ );
+ }
+
+ if (@pcols == 1) {
+ return $self->$op (
+ $rsrc,
+ $op eq 'update' ? $values : (),
+ { $pcols[0] => { -in => $rs->as_query } },
+ );
+ }
+
+ else {
+ return $self->_multipk_update_delete (@_);
+ }
+}
+
+# ANSI SQL does not provide a reliable way to perform a multicol-PK
+# resultset update/delete involving subqueries. So by default resort
+# to simple (and inefficient) delete_all style per-row opearations,
+# while allowing specific storages to override this with a faster
+# implementation.
+#
+sub _multipk_update_delete {
+ return shift->_per_row_update_delete (@_);
+}
+
+# This is the default loop used to delete/update rows for multi PK
+# resultsets, and used by mysql exclusively (because it can't do anything
+# else).
+#
+# We do not use $row->$op style queries, because resultset update/delete
+# is not expected to cascade (this is what delete_all/update_all is for).
+#
+# There should be no race conditions as the entire operation is rolled
+# in a transaction.
+#
+sub _per_row_update_delete {
+ my $self = shift;
+ my ($rs, $op, $values) = @_;
- if (ref $condition eq 'SCALAR') {
- $order = $1 if $$condition =~ s/ORDER BY (.*)$//i;
+ my $rsrc = $rs->result_source;
+ my @pcols = $rsrc->primary_columns;
+
+ my $guard = $self->txn_scope_guard;
+
+ # emulate the return value of $sth->execute for non-selects
+ my $row_cnt = '0E0';
+
+ my $subrs_cur = $rs->cursor;
+ while (my @pks = $subrs_cur->next) {
+
+ my $cond;
+ for my $i (0.. $#pcols) {
+ $cond->{$pcols[$i]} = $pks[$i];
+ }
+
+ $self->$op (
+ $rsrc,
+ $op eq 'update' ? $values : (),
+ $cond,
+ );
+
+ $row_cnt++;
}
- my $for = delete $attrs->{for};
+ $guard->commit;
+
+ return $row_cnt;
+}
+
+sub _select {
+ my $self = shift;
+
+ # localization is neccessary as
+ # 1) there is no infrastructure to pass this around before SQLA2
+ # 2) _select_args sets it and _prep_for_execute consumes it
my $sql_maker = $self->sql_maker;
- local $sql_maker->{for} = $for;
+ local $sql_maker->{_dbic_rs_attrs};
- if (exists $attrs->{group_by} || $attrs->{having}) {
- $order = {
- group_by => $attrs->{group_by},
- having => $attrs->{having},
- ($order ? (order_by => $order) : ())
- };
+ return $self->_execute($self->_select_args(@_));
+}
+
+sub _select_args_to_query {
+ my $self = shift;
+
+ # localization is neccessary as
+ # 1) there is no infrastructure to pass this around before SQLA2
+ # 2) _select_args sets it and _prep_for_execute consumes it
+ my $sql_maker = $self->sql_maker;
+ local $sql_maker->{_dbic_rs_attrs};
+
+ # my ($op, $bind, $ident, $bind_attrs, $select, $cond, $order, $rows, $offset)
+ # = $self->_select_args($ident, $select, $cond, $attrs);
+ my ($op, $bind, $ident, $bind_attrs, @args) =
+ $self->_select_args(@_);
+
+ # my ($sql, $prepared_bind) = $self->_prep_for_execute($op, $bind, $ident, [ $select, $cond, $order, $rows, $offset ]);
+ my ($sql, $prepared_bind) = $self->_prep_for_execute($op, $bind, $ident, \@args);
+ $prepared_bind ||= [];
+
+ return wantarray
+ ? ($sql, $prepared_bind, $bind_attrs)
+ : \[ "($sql)", @$prepared_bind ]
+ ;
+}
+
+sub _select_args {
+ my ($self, $ident, $select, $where, $attrs) = @_;
+
+ my ($alias2source, $rs_alias) = $self->_resolve_ident_sources ($ident);
+
+ my $sql_maker = $self->sql_maker;
+ $sql_maker->{_dbic_rs_attrs} = {
+ %$attrs,
+ select => $select,
+ from => $ident,
+ where => $where,
+ $rs_alias
+ ? ( _source_handle => $alias2source->{$rs_alias}->handle )
+ : ()
+ ,
+ };
+
+ # calculate bind_attrs before possible $ident mangling
+ my $bind_attrs = {};
+ for my $alias (keys %$alias2source) {
+ my $bindtypes = $self->source_bind_attributes ($alias2source->{$alias}) || {};
+ for my $col (keys %$bindtypes) {
+
+ my $fqcn = join ('.', $alias, $col);
+ $bind_attrs->{$fqcn} = $bindtypes->{$col} if $bindtypes->{$col};
+
+ # Unqialified column names are nice, but at the same time can be
+ # rather ambiguous. What we do here is basically go along with
+ # the loop, adding an unqualified column slot to $bind_attrs,
+ # alongside the fully qualified name. As soon as we encounter
+ # another column by that name (which would imply another table)
+ # we unset the unqualified slot and never add any info to it
+ # to avoid erroneous type binding. If this happens the users
+ # only choice will be to fully qualify his column name
+
+ if (exists $bind_attrs->{$col}) {
+ $bind_attrs->{$col} = {};
+ }
+ else {
+ $bind_attrs->{$col} = $bind_attrs->{$fqcn};
+ }
+ }
}
- my $bind_attrs = {}; ## Future support
- my @args = ('select', $attrs->{bind}, $ident, $bind_attrs, $select, $condition, $order);
- if ($attrs->{software_limit} ||
- $self->sql_maker->_default_limit_syntax eq "GenericSubQ") {
- $attrs->{software_limit} = 1;
- } else {
+
+ # adjust limits
+ if (
+ $attrs->{software_limit}
+ ||
+ $sql_maker->_default_limit_syntax eq "GenericSubQ"
+ ) {
+ $attrs->{software_limit} = 1;
+ }
+ else {
$self->throw_exception("rows attribute must be positive if present")
if (defined($attrs->{rows}) && !($attrs->{rows} > 0));
# MySQL actually recommends this approach. I cringe.
$attrs->{rows} = 2**48 if not defined $attrs->{rows} and defined $attrs->{offset};
- push @args, $attrs->{rows}, $attrs->{offset};
}
- return $self->_execute(@args);
+ my @limit;
+
+ # see if we need to tear the prefetch apart (either limited has_many or grouped prefetch)
+ # otherwise delegate the limiting to the storage, unless software limit was requested
+ if (
+ ( $attrs->{rows} && keys %{$attrs->{collapse}} )
+ ||
+ ( $attrs->{group_by} && @{$attrs->{group_by}} &&
+ $attrs->{_prefetch_select} && @{$attrs->{_prefetch_select}} )
+ ) {
+ ($ident, $select, $where, $attrs)
+ = $self->_adjust_select_args_for_complex_prefetch ($ident, $select, $where, $attrs);
+ }
+ elsif (! $attrs->{software_limit} ) {
+ push @limit, $attrs->{rows}, $attrs->{offset};
+ }
+
+###
+ # This would be the point to deflate anything found in $where
+ # (and leave $attrs->{bind} intact). Problem is - inflators historically
+ # expect a row object. And all we have is a resultsource (it is trivial
+ # to extract deflator coderefs via $alias2source above).
+ #
+ # I don't see a way forward other than changing the way deflators are
+ # invoked, and that's just bad...
+###
+
+ my $order = { map
+ { $attrs->{$_} ? ( $_ => $attrs->{$_} ) : () }
+ (qw/order_by group_by having/ )
+ };
+
+ return ('select', $attrs->{bind}, $ident, $bind_attrs, $select, $where, $order, @limit);
+}
+
+#
+# This is the code producing joined subqueries like:
+# SELECT me.*, other.* FROM ( SELECT me.* FROM ... ) JOIN other ON ...
+#
+sub _adjust_select_args_for_complex_prefetch {
+ my ($self, $from, $select, $where, $attrs) = @_;
+
+ $self->throw_exception ('Complex prefetches are not supported on resultsets with a custom from attribute')
+ if (ref $from ne 'ARRAY');
+
+ # copies for mangling
+ $from = [ @$from ];
+ $select = [ @$select ];
+ $attrs = { %$attrs };
+
+ # separate attributes
+ my $sub_attrs = { %$attrs };
+ delete $attrs->{$_} for qw/where bind rows offset group_by having/;
+ delete $sub_attrs->{$_} for qw/for collapse _prefetch_select _collapse_order_by select as/;
+
+ my $select_root_alias = $attrs->{alias};
+ my $sql_maker = $self->sql_maker;
+
+ # create subquery select list - consider only stuff *not* brought in by the prefetch
+ my $sub_select = [];
+ my $sub_group_by;
+ for my $i (0 .. @{$attrs->{select}} - @{$attrs->{_prefetch_select}} - 1) {
+ my $sel = $attrs->{select}[$i];
+
+ # alias any functions to the dbic-side 'as' label
+ # adjust the outer select accordingly
+ if (ref $sel eq 'HASH' && !$sel->{-select}) {
+ $sel = { -select => $sel, -as => $attrs->{as}[$i] };
+ $select->[$i] = join ('.', $attrs->{alias}, ($attrs->{as}[$i] || "select_$i") );
+ }
+
+ push @$sub_select, $sel;
+ }
+
+ # bring over all non-collapse-induced order_by into the inner query (if any)
+ # the outer one will have to keep them all
+ delete $sub_attrs->{order_by};
+ if (my $ord_cnt = @{$attrs->{order_by}} - @{$attrs->{_collapse_order_by}} ) {
+ $sub_attrs->{order_by} = [
+ @{$attrs->{order_by}}[ 0 .. $ord_cnt - 1]
+ ];
+ }
+
+ # mangle {from}, keep in mind that $from is "headless" from here on
+ my $join_root = shift @$from;
+
+ my %inner_joins;
+ my %join_info = map { $_->[0]{-alias} => $_->[0] } (@$from);
+
+ # in complex search_related chains $select_root_alias may *not* be
+ # 'me' so always include it in the inner join
+ $inner_joins{$select_root_alias} = 1 if ($join_root->{-alias} ne $select_root_alias);
+
+
+ # decide which parts of the join will remain on the inside
+ #
+ # this is not a very viable optimisation, but it was written
+ # before I realised this, so might as well remain. We can throw
+ # away _any_ branches of the join tree that are:
+ # 1) not mentioned in the condition/order
+ # 2) left-join leaves (or left-join leaf chains)
+ # Most of the join conditions will not satisfy this, but for real
+ # complex queries some might, and we might make some RDBMS happy.
+ #
+ #
+ # since we do not have introspectable SQLA, we fall back to ugly
+ # scanning of raw SQL for WHERE, and for pieces of ORDER BY
+ # in order to determine what goes into %inner_joins
+ # It may not be very efficient, but it's a reasonable stop-gap
+ {
+ # produce stuff unquoted, so it can be scanned
+ local $sql_maker->{quote_char};
+ my $sep = $self->_sql_maker_opts->{name_sep} || '.';
+ $sep = "\Q$sep\E";
+
+ my @order_by = (map
+ { ref $_ ? $_->[0] : $_ }
+ $sql_maker->_order_by_chunks ($sub_attrs->{order_by})
+ );
+
+ my $where_sql = $sql_maker->where ($where);
+ my $select_sql = $sql_maker->_recurse_fields ($sub_select);
+
+ # sort needed joins
+ for my $alias (keys %join_info) {
+
+ # any table alias found on a column name in where or order_by
+ # gets included in %inner_joins
+ # Also any parent joins that are needed to reach this particular alias
+ for my $piece ($select_sql, $where_sql, @order_by ) {
+ if ($piece =~ /\b $alias $sep/x) {
+ $inner_joins{$alias} = 1;
+ }
+ }
+ }
+ }
+
+ # scan for non-leaf/non-left joins and mark as needed
+ # also mark all ancestor joins that are needed to reach this particular alias
+ # (e.g. join => { cds => 'tracks' } - tracks will bring cds too )
+ #
+ # traverse by the size of the -join_path i.e. reverse depth first
+ for my $alias (sort { @{$join_info{$b}{-join_path}} <=> @{$join_info{$a}{-join_path}} } (keys %join_info) ) {
+
+ my $j = $join_info{$alias};
+ $inner_joins{$alias} = 1 if (! $j->{-join_type} || ($j->{-join_type} !~ /^left$/i) );
+
+ if ($inner_joins{$alias}) {
+ $inner_joins{$_} = 1 for (@{$j->{-join_path}});
+ }
+ }
+
+ # construct the inner $from for the subquery
+ my $inner_from = [ $join_root ];
+ for my $j (@$from) {
+ push @$inner_from, $j if $inner_joins{$j->[0]{-alias}};
+ }
+
+ # if a multi-type join was needed in the subquery ("multi" is indicated by
+ # presence in {collapse}) - add a group_by to simulate the collapse in the subq
+ unless ($sub_attrs->{group_by}) {
+ for my $alias (keys %inner_joins) {
+
+ # the dot comes from some weirdness in collapse
+ # remove after the rewrite
+ if ($attrs->{collapse}{".$alias"}) {
+ $sub_attrs->{group_by} ||= $sub_select;
+ last;
+ }
+ }
+ }
+
+ # generate the subquery
+ my $subq = $self->_select_args_to_query (
+ $inner_from,
+ $sub_select,
+ $where,
+ $sub_attrs
+ );
+ my $subq_joinspec = {
+ -alias => $select_root_alias,
+ -source_handle => $join_root->{-source_handle},
+ $select_root_alias => $subq,
+ };
+
+ # Generate a new from (really just replace the join slot with the subquery)
+ # Before we would start the outer chain from the subquery itself (i.e.
+ # SELECT ... FROM (SELECT ... ) alias JOIN ..., but this turned out to be
+ # a bad idea for search_related, as the root of the chain was effectively
+ # lost (i.e. $artist_rs->search_related ('cds'... ) would result in alias
+ # of 'cds', which would prevent from doing things like order_by artist.*)
+ # See t/prefetch/via_search_related.t for a better idea
+ my @outer_from;
+ if ($join_root->{-alias} eq $select_root_alias) { # just swap the root part and we're done
+ @outer_from = (
+ $subq_joinspec,
+ @$from,
+ )
+ }
+ else { # this is trickier
+ @outer_from = ($join_root);
+
+ for my $j (@$from) {
+ if ($j->[0]{-alias} eq $select_root_alias) {
+ push @outer_from, [
+ $subq_joinspec,
+ @{$j}[1 .. $#$j],
+ ];
+ }
+ else {
+ push @outer_from, $j;
+ }
+ }
+ }
+
+ # This is totally horrific - the $where ends up in both the inner and outer query
+ # Unfortunately not much can be done until SQLA2 introspection arrives, and even
+ # then if where conditions apply to the *right* side of the prefetch, you may have
+ # to both filter the inner select (e.g. to apply a limit) and then have to re-filter
+ # the outer select to exclude joins you didin't want in the first place
+ #
+ # OTOH it can be seen as a plus: <ash> (notes that this query would make a DBA cry ;)
+ return (\@outer_from, $select, $where, $attrs);
+}
+
+sub _resolve_ident_sources {
+ my ($self, $ident) = @_;
+
+ my $alias2source = {};
+ my $rs_alias;
+
+ # the reason this is so contrived is that $ident may be a {from}
+ # structure, specifying multiple tables to join
+ if ( Scalar::Util::blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
+ # this is compat mode for insert/update/delete which do not deal with aliases
+ $alias2source->{me} = $ident;
+ $rs_alias = 'me';
+ }
+ elsif (ref $ident eq 'ARRAY') {
+
+ for (@$ident) {
+ my $tabinfo;
+ if (ref $_ eq 'HASH') {
+ $tabinfo = $_;
+ $rs_alias = $tabinfo->{-alias};
+ }
+ if (ref $_ eq 'ARRAY' and ref $_->[0] eq 'HASH') {
+ $tabinfo = $_->[0];
+ }
+
+ $alias2source->{$tabinfo->{-alias}} = $tabinfo->{-source_handle}->resolve
+ if ($tabinfo->{-source_handle});
+ }
+ }
+
+ return ($alias2source, $rs_alias);
+}
+
+# Takes $ident, \@column_names
+#
+# returns { $column_name => \%column_info, ... }
+# also note: this adds -result_source => $rsrc to the column info
+#
+# usage:
+# my $col_sources = $self->_resolve_column_info($ident, @column_names);
+sub _resolve_column_info {
+ my ($self, $ident, $colnames) = @_;
+ my ($alias2src, $root_alias) = $self->_resolve_ident_sources($ident);
+
+ my $sep = $self->_sql_maker_opts->{name_sep} || '.';
+ $sep = "\Q$sep\E";
+
+ my (%return, %seen_cols);
+
+ # compile a global list of column names, to be able to properly
+ # disambiguate unqualified column names (if at all possible)
+ for my $alias (keys %$alias2src) {
+ my $rsrc = $alias2src->{$alias};
+ for my $colname ($rsrc->columns) {
+ push @{$seen_cols{$colname}}, $alias;
+ }
+ }
+
+ COLUMN:
+ foreach my $col (@$colnames) {
+ my ($alias, $colname) = $col =~ m/^ (?: ([^$sep]+) $sep)? (.+) $/x;
+
+ unless ($alias) {
+ # see if the column was seen exactly once (so we know which rsrc it came from)
+ if ($seen_cols{$colname} and @{$seen_cols{$colname}} == 1) {
+ $alias = $seen_cols{$colname}[0];
+ }
+ else {
+ next COLUMN;
+ }
+ }
+
+ my $rsrc = $alias2src->{$alias};
+ $return{$col} = $rsrc && {
+ %{$rsrc->column_info($colname)},
+ -result_source => $rsrc,
+ -source_alias => $alias,
+ };
+ }
+
+ return \%return;
+}
+
+# Returns a counting SELECT for a simple count
+# query. Abstracted so that a storage could override
+# this to { count => 'firstcol' } or whatever makes
+# sense as a performance optimization
+sub _count_select {
+ #my ($self, $source, $rs_attrs) = @_;
+ return { count => '*' };
}
+# Returns a SELECT which will end up in the subselect
+# There may or may not be a group_by, as the subquery
+# might have been called to accomodate a limit
+#
+# Most databases would be happy with whatever ends up
+# here, but some choke in various ways.
+#
+sub _subq_count_select {
+ my ($self, $source, $rs_attrs) = @_;
+ return $rs_attrs->{group_by} if $rs_attrs->{group_by};
+
+ my @pcols = map { join '.', $rs_attrs->{alias}, $_ } ($source->primary_columns);
+ return @pcols ? \@pcols : [ 1 ];
+}
+
+
sub source_bind_attributes {
my ($self, $source) = @_;
-
+
my $bind_attributes;
foreach my $column ($source->columns) {
-
+
my $data_type = $source->column_info($column)->{data_type} || '';
$bind_attributes->{$column} = $self->bind_attribute_by_data_type($data_type)
if $data_type;
my $self = shift;
my ($rv, $sth, @bind) = $self->_select(@_);
my @row = $sth->fetchrow_array;
- if(@row && $sth->fetchrow_array) {
+ my @nextrow = $sth->fetchrow_array if @row;
+ if(@row && @nextrow) {
carp "Query returned more than one row. SQL that returns multiple rows is DEPRECATED for ->find and ->single";
}
# Need to call finish() to work round broken DBDs
=cut
sub _dbh_last_insert_id {
- my ($self, $dbh, $source, $col) = @_;
- # XXX This is a SQLite-ism as a default... is there a DBI-generic way?
- $dbh->func('last_insert_rowid');
+ # All Storage's need to register their own _dbh_last_insert_id
+ # the old SQLite-based method was highly inappropriate
+
+ my $self = shift;
+ my $class = ref $self;
+ $self->throw_exception (<<EOE);
+
+No _dbh_last_insert_id() method found in $class.
+Since the method of obtaining the autoincrement id of the last insert
+operation varies greatly between different databases, this method must be
+individually implemented for every storage class.
+EOE
}
sub last_insert_id {
=cut
-sub sqlt_type { shift->dbh->{Driver}->{Name} }
+sub sqlt_type { shift->last_dbh->{Driver}->{Name} }
=head2 bind_attribute_by_data_type
-Given a datatype from column info, returns a database specific bind attribute for
-$dbh->bind_param($val,$attribute) or nothing if we will let the database planner
-just handle it.
+Given a datatype from column info, returns a database specific bind
+attribute for C<< $dbh->bind_param($val,$attribute) >> or nothing if we will
+let the database planner just handle it.
Generally only needed for special case column types, like bytea in postgres.
return;
}
-=head2 create_ddl_dir
+=head2 is_datatype_numeric
+
+Given a datatype from column_info, returns a boolean value indicating if
+the current RDBMS considers it a numeric value. This controls how
+L<DBIx::Class::Row/set_column> decides whether to mark the column as
+dirty - when the datatype is deemed numeric a C<< != >> comparison will
+be performed instead of the usual C<eq>.
+
+=cut
+
+sub is_datatype_numeric {
+ my ($self, $dt) = @_;
+
+ return 0 unless $dt;
+
+ return $dt =~ /^ (?:
+ numeric | int(?:eger)? | (?:tiny|small|medium|big)int | dec(?:imal)? | real | float | double (?: \s+ precision)? | (?:big)?serial
+ ) $/ix;
+}
+
+
+=head2 create_ddl_dir (EXPERIMENTAL)
=over 4
=back
Creates a SQL file based on the Schema, for each of the specified
-database types, in the given directory.
+database engines in C<\@databases> in the given directory.
+(note: specify L<SQL::Translator> names, not L<DBI> driver names).
+
+Given a previous version number, this will also create a file containing
+the ALTER TABLE statements to transform the previous schema into the
+current one. Note that these statements may contain C<DROP TABLE> or
+C<DROP COLUMN> statements that can potentially destroy data.
+
+The file names are created using the C<ddl_filename> method below, please
+override this method in your schema if you would like a different file
+name format. For the ALTER file, the same format is used, replacing
+$version in the name with "$preversion-$version".
+
+See L<SQL::Translator/METHODS> for a list of values for C<\%sqlt_args>.
+The most common value for this would be C<< { add_drop_table => 1 } >>
+to have the SQL produced include a C<DROP TABLE> statement for each table
+created. For quoting purposes supply C<quote_table_names> and
+C<quote_field_names>.
+
+If no arguments are passed, then the following default values are assumed:
+
+=over 4
+
+=item databases - ['MySQL', 'SQLite', 'PostgreSQL']
+
+=item version - $schema->schema_version
+
+=item directory - './'
+
+=item preversion - <none>
+
+=back
By default, C<\%sqlt_args> will have
{ add_drop_table => 1, ignore_constraint_names => 1, ignore_index_names => 1 }
-merged with the hash passed in. To disable any of those features, pass in a
+merged with the hash passed in. To disable any of those features, pass in a
hashref like the following
{ ignore_constraint_names => 0, # ... other options }
+
+Note that this feature is currently EXPERIMENTAL and may not work correctly
+across all databases, or fully handle complex relationships.
+
+WARNING: Please check all SQL files created, before applying them.
+
=cut
sub create_ddl_dir {
my ($self, $schema, $databases, $version, $dir, $preversion, $sqltargs) = @_;
if(!$dir || !-d $dir) {
- warn "No directory given, using ./\n";
+ carp "No directory given, using ./\n";
$dir = "./";
}
$databases ||= ['MySQL', 'SQLite', 'PostgreSQL'];
$databases = [ $databases ] if(ref($databases) ne 'ARRAY');
- $version ||= $schema->VERSION || '1.x';
+
+ my $schema_version = $schema->schema_version || '1.x';
+ $version ||= $schema_version;
+
$sqltargs = {
- add_drop_table => 1,
+ add_drop_table => 1,
ignore_constraint_names => 1,
ignore_index_names => 1,
%{$sqltargs || {}}
};
- $self->throw_exception(q{Can't create a ddl file without SQL::Translator 0.09: '}
+ $self->throw_exception(q{Can't create a ddl file without SQL::Translator 0.09003: '}
. $self->_check_sqlt_message . q{'})
if !$self->_check_sqlt_version;
my $sqlt = SQL::Translator->new( $sqltargs );
$sqlt->parser('SQL::Translator::Parser::DBIx::Class');
- my $sqlt_schema = $sqlt->translate({ data => $schema }) or die $sqlt->error;
+ my $sqlt_schema = $sqlt->translate({ data => $schema })
+ or $self->throw_exception ($sqlt->error);
foreach my $db (@$databases) {
$sqlt->reset();
- $sqlt = $self->configure_sqlt($sqlt, $db);
$sqlt->{schema} = $sqlt_schema;
$sqlt->producer($db);
my $file;
my $filename = $schema->ddl_filename($db, $version, $dir);
- if (-e $filename && (!$version || ($version == $schema->schema_version()))) {
+ if (-e $filename && ($version eq $schema_version )) {
# if we are dumping the current version, overwrite the DDL
- warn "Overwriting existing DDL file - $filename";
+ carp "Overwriting existing DDL file - $filename";
unlink($filename);
}
my $output = $sqlt->translate;
if(!$output) {
- warn("Failed to translate to $db, skipping. (" . $sqlt->error . ")");
+ carp("Failed to translate to $db, skipping. (" . $sqlt->error . ")");
next;
}
if(!open($file, ">$filename")) {
}
print $file $output;
close($file);
-
+
next unless ($preversion);
require SQL::Translator::Diff;
my $prefilename = $schema->ddl_filename($db, $preversion, $dir);
if(!-e $prefilename) {
- warn("No previous schema file found ($prefilename)");
+ carp("No previous schema file found ($prefilename)");
next;
}
my $difffile = $schema->ddl_filename($db, $version, $dir, $preversion);
if(-e $difffile) {
- warn("Overwriting existing diff file - $difffile");
+ carp("Overwriting existing diff file - $difffile");
unlink($difffile);
}
-
+
my $source_schema;
{
my $t = SQL::Translator->new($sqltargs);
$t->debug( 0 );
$t->trace( 0 );
- $t->parser( $db ) or die $t->error;
- $t = $self->configure_sqlt($t, $db);
- my $out = $t->translate( $prefilename ) or die $t->error;
+
+ $t->parser( $db )
+ or $self->throw_exception ($t->error);
+
+ my $out = $t->translate( $prefilename )
+ or $self->throw_exception ($t->error);
+
$source_schema = $t->schema;
- unless ( $source_schema->name ) {
- $source_schema->name( $prefilename );
- }
+
+ $source_schema->name( $prefilename )
+ unless ( $source_schema->name );
}
- # The "new" style of producers have sane normalization and can support
+ # The "new" style of producers have sane normalization and can support
# diffing a SQL file against a DBIC->SQLT schema. Old style ones don't
# And we have to diff parsed SQL against parsed SQL.
my $dest_schema = $sqlt_schema;
-
+
unless ( "SQL::Translator::Producer::$db"->can('preprocess_schema') ) {
my $t = SQL::Translator->new($sqltargs);
$t->debug( 0 );
$t->trace( 0 );
- $t->parser( $db ) or die $t->error;
- $t = $self->configure_sqlt($t, $db);
- my $out = $t->translate( $filename ) or die $t->error;
+
+ $t->parser( $db )
+ or $self->throw_exception ($t->error);
+
+ my $out = $t->translate( $filename )
+ or $self->throw_exception ($t->error);
+
$dest_schema = $t->schema;
+
$dest_schema->name( $filename )
unless $dest_schema->name;
}
-
+
my $diff = SQL::Translator::Diff::schema_diff($source_schema, $db,
$dest_schema, $db,
$sqltargs
);
- if(!open $file, ">$difffile") {
+ if(!open $file, ">$difffile") {
$self->throw_exception("Can't write to $difffile ($!)");
next;
}
}
}
-sub configure_sqlt() {
- my $self = shift;
- my $tr = shift;
- my $db = shift || $self->sqlt_type;
- if ($db eq 'PostgreSQL') {
- $tr->quote_table_names(0);
- $tr->quote_field_names(0);
- }
- return $tr;
-}
-
=head2 deployment_statements
=over 4
=back
Returns the statements used by L</deploy> and L<DBIx::Class::Schema/deploy>.
-The database driver name is given by C<$type>, though the value from
-L</sqlt_type> is used if it is not specified.
+
+The L<SQL::Translator> (not L<DBI>) database driver name can be explicitly
+provided in C<$type>, otherwise the result of L</sqlt_type> is used as default.
C<$directory> is used to return statements from files in a previously created
L</create_ddl_dir> directory and is optional. The filenames are constructed
sub deployment_statements {
my ($self, $schema, $type, $version, $dir, $sqltargs) = @_;
# Need to be connected to get the correct sqlt_type
- $self->ensure_connected() unless $type;
+ $self->last_dbh() unless $type;
$type ||= $self->sqlt_type;
- $version ||= $schema->VERSION || '1.x';
+ $version ||= $schema->schema_version || '1.x';
$dir ||= './';
- my $filename = $schema->ddl_filename($type, $dir, $version);
+ my $filename = $schema->ddl_filename($type, $version, $dir);
if(-f $filename)
{
my $file;
- open($file, "<$filename")
+ open($file, "<$filename")
or $self->throw_exception("Can't open $filename ($!)");
my @rows = <$file>;
close($file);
return join('', @rows);
}
- $self->throw_exception(q{Can't deploy without SQL::Translator 0.09: '}
+ $self->throw_exception(q{Can't deploy without SQL::Translator 0.09003: '}
. $self->_check_sqlt_message . q{'})
if !$self->_check_sqlt_version;
eval qq{use SQL::Translator::Producer::${type}};
$self->throw_exception($@) if $@;
- # sources needs to be a parser arg, but for simplicty allow at top level
+ # sources needs to be a parser arg, but for simplicty allow at top level
# coming in
$sqltargs->{parser_args}{sources} = delete $sqltargs->{sources}
if exists $sqltargs->{sources};
my $tr = SQL::Translator->new(%$sqltargs);
SQL::Translator::Parser::DBIx::Class::parse( $tr, $schema );
return "SQL::Translator::Producer::${type}"->can('produce')->($tr);
-
- return;
-
}
sub deploy {
my ($self, $schema, $type, $sqltargs, $dir) = @_;
- foreach my $statement ( $self->deployment_statements($schema, $type, undef, $dir, { no_comments => 1, %{ $sqltargs || {} } } ) ) {
- foreach my $line ( split(";\n", $statement)) {
- next if($line =~ /^--/);
- next if(!$line);
-# next if($line =~ /^DROP/m);
- next if($line =~ /^BEGIN TRANSACTION/m);
- next if($line =~ /^COMMIT/m);
- next if $line =~ /^\s+$/; # skip whitespace only
- $self->_query_start($line);
- eval {
- $self->dbh->do($line); # shouldn't be using ->dbh ?
- };
- if ($@) {
- warn qq{$@ (running "${line}")};
- }
- $self->_query_end($line);
+ my $deploy = sub {
+ my $line = shift;
+ return if($line =~ /^--/);
+ return if(!$line);
+ # next if($line =~ /^DROP/m);
+ return if($line =~ /^BEGIN TRANSACTION/m);
+ return if($line =~ /^COMMIT/m);
+ return if $line =~ /^\s+$/; # skip whitespace only
+ $self->_query_start($line);
+ eval {
+ # a previous error may invalidate $dbh - thus we need to use dbh()
+ # to guarantee a healthy $dbh (this is temporary until we get
+ # proper error handling on deploy() )
+ $self->dbh->do($line);
+ };
+ if ($@) {
+ carp qq{$@ (running "${line}")};
+ }
+ $self->_query_end($line);
+ };
+ my @statements = $self->deployment_statements($schema, $type, undef, $dir, { %{ $sqltargs || {} }, no_comments => 1 } );
+ if (@statements > 1) {
+ foreach my $statement (@statements) {
+ $deploy->( $statement );
+ }
+ }
+ elsif (@statements == 1) {
+ foreach my $line ( split(";\n", $statements[0])) {
+ $deploy->( $line );
}
}
}
sub datetime_parser {
my $self = shift;
return $self->{datetime_parser} ||= do {
- $self->ensure_connected;
+ $self->last_dbh;
$self->build_datetime_parser(@_);
};
}
my $_check_sqlt_message; # private
sub _check_sqlt_version {
return $_check_sqlt_version if defined $_check_sqlt_version;
- eval 'use SQL::Translator "0.09"';
+ eval 'use SQL::Translator "0.09003"';
$_check_sqlt_message = $@ || '';
$_check_sqlt_version = !$@;
}
sub is_replicating {
return;
-
+
}
=head2 lag_behind_master
1;
-=head1 SQL METHODS
-
-The module defines a set of methods within the DBIC::SQL::Abstract
-namespace. These build on L<SQL::Abstract::Limit> to provide the
-SQL query functions.
-
-The following methods are extended:-
-
-=over 4
-
-=item delete
-
-=item insert
+=head1 USAGE NOTES
-=item select
+=head2 DBIx::Class and AutoCommit
-=item update
-
-=item limit_dialect
-
-See L</connect_info> for details.
-For setting, this method is deprecated in favor of L</connect_info>.
-
-=item quote_char
-
-See L</connect_info> for details.
-For setting, this method is deprecated in favor of L</connect_info>.
-
-=item name_sep
+DBIx::Class can do some wonderful magic with handling exceptions,
+disconnections, and transactions when you use C<< AutoCommit => 1 >>
+(the default) combined with C<txn_do> for transaction support.
-See L</connect_info> for details.
-For setting, this method is deprecated in favor of L</connect_info>.
+If you set C<< AutoCommit => 0 >> in your connect info, then you are always
+in an assumed transaction between commits, and you're telling us you'd
+like to manage that manually. A lot of the magic protections offered by
+this module will go away. We can't protect you from exceptions due to database
+disconnects because we don't know anything about how to restart your
+transactions. You're on your own for handling all sorts of exceptional
+cases if you choose the C<< AutoCommit => 0 >> path, just as you would
+be with raw DBI.
-=back
=head1 AUTHORS