use strict;
use warnings;
+use base qw/DBIx::Class::Storage::DBI/;
+use mro 'c3';
+use DBIx::Class::Carp;
use Scope::Guard ();
use Context::Preserve 'preserve_context';
use Try::Tiny;
+use List::Util 'first';
use namespace::clean;
__PACKAGE__->sql_limit_dialect ('RowNum');
+__PACKAGE__->sql_quote_char ('"');
+__PACKAGE__->sql_maker_class('DBIx::Class::SQLMaker::Oracle');
+__PACKAGE__->datetime_parser_type('DateTime::Format::Oracle');
+
+sub __cache_queries_with_max_lob_parts { 2 }
=head1 NAME
This class implements base Oracle support. The subclass
L<DBIx::Class::Storage::DBI::Oracle::WhereJoins> is for C<(+)> joins in Oracle
-versions before 9.
+versions before 9.0.
=head1 METHODS
=cut
-use base qw/DBIx::Class::Storage::DBI/;
-use mro 'c3';
+sub _determine_supports_insert_returning {
+ my $self = shift;
-__PACKAGE__->sql_maker_class('DBIx::Class::SQLMaker::Oracle');
+# TODO find out which version supports the RETURNING syntax
+# 8i has it and earlier docs are a 404 on oracle.com
+
+ return 1
+ if $self->_server_info->{normalized_dbms_version} >= 8.001;
+
+ return 0;
+}
+
+__PACKAGE__->_use_insert_returning_bound (1);
sub deployment_statements {
my $self = shift;;
# disable default bindtype
local $sql_maker->{bindtype} = 'normal';
-
# look up the correct sequence automatically
my ( $schema, $table ) = $source_name =~ /( (?:${ql})? \w+ (?:${qr})? ) \. ( (?:${ql})? \w+ (?:${qr})? )/x;
+
+ # if no explicit schema was requested - use the default schema (which in the case of Oracle is the db user)
+ $schema ||= \'= USER';
+
my ($sql, @bind) = $sql_maker->select (
'ALL_TRIGGERS',
[qw/TRIGGER_BODY TABLE_OWNER TRIGGER_NAME/],
{
- $schema ? (OWNER => $schema) : (),
+ OWNER => $schema,
TABLE_NAME => $table || $source_name,
TRIGGERING_EVENT => { -like => '%INSERT%' }, # this will also catch insert_or_update
TRIGGER_TYPE => { -like => '%BEFORE%' }, # we care only about 'before' triggers
# to find all the triggers that mention the column in question a simple
# regex grep since the trigger_body above is a LONG and hence not searchable
+ # via -like
my @triggers = ( map
{ my %inf; @inf{qw/body schema name/} = @$_; \%inf }
( grep
)
);
- # extract all sequence names mentioned in each trigger
- for (@triggers) {
- $_->{sequences} = [ $_->{body} =~ / ( "? [\.\w\"\-]+ "? ) \. nextval /xig ];
- }
+ # extract all sequence names mentioned in each trigger, throw away
+ # triggers without apparent sequences
+ @triggers = map {
+ my @seqs = $_->{body} =~ / ( [\.\w\"\-]+ ) \. nextval /xig;
+ @seqs
+ ? { %$_, sequences => \@seqs }
+ : ()
+ ;
+ } @triggers;
my $chosen_trigger;
my ( $self, $type, $seq ) = @_;
# use the maker to leverage quoting settings
- my $sql_maker = $self->sql_maker;
- my ($id) = $self->_get_dbh->selectrow_array ($sql_maker->select('DUAL', [ ref $seq ? \"$$seq.$type" : "$seq.$type" ] ) );
+ my $sth = $self->_dbh->prepare_cached(
+ $self->sql_maker->select('DUAL', [ ref $seq ? \"$$seq.$type" : "$seq.$type" ] )
+ );
+ $sth->execute;
+ my ($id) = $sth->fetchrow_array;
+ $sth->finish;
return $id;
}
}
sub _dbh_execute {
- my $self = shift;
- my ($dbh, $op, $extra_bind, $ident, $bind_attributes, @args) = @_;
+ my ($self, $dbh, $sql, @args) = @_;
my (@res, $tried);
my $want = wantarray;
my $next = $self->next::can;
do {
try {
- my $exec = sub { $self->$next($dbh, $op, $extra_bind, $ident, $bind_attributes, @args) };
+ my $exec = sub {
+ # Turn off sth caching for multi-part LOBs. See _prep_for_execute above.
+ local $self->{disable_sth_caching} = 1
+ if first {
+ ($_->[0]{_ora_lob_autosplit_part}||0)
+ > (__cache_queries_with_max_lob_parts-1)
+ } @{ $args[0] };
+
+ $self->$next($dbh, $sql, @args)
+ };
if (!defined $want) {
$exec->();
if (! $tried and $_ =~ /ORA-01003/) {
# ORA-01003: no statement parsed (someone changed the table somehow,
# invalidating your cursor.)
- my ($sql, $bind) = $self->_prep_for_execute($op, $extra_bind, $ident, \@args);
delete $dbh->{CachedKids}{$sql};
}
else {
return wantarray ? @res : $res[0];
}
+sub _dbh_execute_array {
+ #my ($self, $sth, $tuple_status, @extra) = @_;
+
+ # DBD::Oracle warns loudly on partial execute_array failures
+ local $_[1]->{PrintWarn} = 0;
+
+ shift->next::method(@_);
+}
+
=head2 get_autoinc_seq
Returns the sequence name for an autoincrement column
This sets the proper DateTime::Format module for use with
L<DBIx::Class::InflateColumn::DateTime>.
-=cut
-
-sub datetime_parser_type { return "DateTime::Format::Oracle"; }
-
=head2 connect_call_datetime_setup
Used as:
);
}
-=head2 source_bind_attributes
+### Note originally by Ron "Quinn" Straight <quinnfazigu@gmail.org>
+### http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=dbsrgits/DBIx-Class.git;a=commitdiff;h=5db2758de644d53e07cd3e05f0e9037bf40116fc
+#
+# Handle LOB types in Oracle. Under a certain size (4k?), you can get away
+# with the driver assuming your input is the deprecated LONG type if you
+# encode it as a hex string. That ain't gonna fly at larger values, where
+# you'll discover you have to do what this does.
+#
+# This method had to be overridden because we need to set ora_field to the
+# actual column, and that isn't passed to the call (provided by Storage) to
+# bind_attribute_by_data_type.
+#
+# According to L<DBD::Oracle>, the ora_field isn't always necessary, but
+# adding it doesn't hurt, and will save your bacon if you're modifying a
+# table with more than one LOB column.
+#
+sub _dbi_attrs_for_bind {
+ my ($self, $ident, $bind) = @_;
+
+ my $attrs = $self->next::method($ident, $bind);
+
+ for my $i (0 .. $#$attrs) {
+ if (keys %{$attrs->[$i]||{}} and my $col = $bind->[$i][0]{dbic_colname}) {
+ $attrs->[$i]{ora_field} = $col;
+ }
+ }
+
+ $attrs;
+}
+
+sub bind_attribute_by_data_type {
+ my ($self, $dt) = @_;
-Handle LOB types in Oracle. Under a certain size (4k?), you can get away
-with the driver assuming your input is the deprecated LONG type if you
-encode it as a hex string. That ain't gonna fly at larger values, where
-you'll discover you have to do what this does.
+ if ($self->_is_lob_type($dt)) {
-This method had to be overridden because we need to set ora_field to the
-actual column, and that isn't passed to the call (provided by Storage) to
-bind_attribute_by_data_type.
+ # this is a hot-ish codepath, store an escape-flag in the DBD namespace, so that
+ # things like Class::Unload work (unlikely but possible)
+ unless ($DBD::Oracle::__DBIC_DBD_VERSION_CHECK_OK__) {
-According to L<DBD::Oracle>, the ora_field isn't always necessary, but
-adding it doesn't hurt, and will save your bacon if you're modifying a
-table with more than one LOB column.
+ # no earlier - no later
+ if ($DBD::Oracle::VERSION eq '1.23') {
+ $self->throw_exception(
+ "BLOB/CLOB support in DBD::Oracle == 1.23 is broken, use an earlier or later ".
+ "version (https://rt.cpan.org/Public/Bug/Display.html?id=46016)"
+ );
+ }
-=cut
+ $DBD::Oracle::__DBIC_DBD_VERSION_CHECK_OK__ = 1;
+ }
-sub source_bind_attributes
-{
- require DBD::Oracle;
+ return {
+ ora_type => $self->_is_text_lob_type($dt)
+ ? DBD::Oracle::ORA_CLOB()
+ : DBD::Oracle::ORA_BLOB()
+ };
+ }
+ else {
+ return undef;
+ }
+}
+
+# Handle blob columns in WHERE.
+#
+# For equality comparisons:
+#
+# We split data intended for comparing to a LOB into 2000 character chunks and
+# compare them using dbms_lob.substr on the LOB column.
+#
+# We turn off DBD::Oracle LOB binds for these partial LOB comparisons by passing
+# dbd_attrs => undef, because these are regular varchar2 comparisons and
+# otherwise the query will fail.
+#
+# Since the most common comparison size is likely to be under 4000 characters
+# (TEXT comparisons previously deployed to other RDBMSes) we disable
+# prepare_cached for queries with more than two part comparisons to a LOB
+# column. This is done in _dbh_execute (above) which was previously overridden
+# to gracefully recover from an Oracle error. This is to be careful to not
+# exhaust your application's open cursor limit.
+#
+# See:
+# http://itcareershift.com/blog1/2011/02/21/oracle-max-number-of-open-cursors-complete-reference-for-the-new-oracle-dba/
+# on the open_cursor limit.
+#
+# For everything else:
+#
+# We assume that everything that is not a LOB comparison, will most likely be a
+# LIKE query or some sort of function invocation. This may prove to be a naive
+# assumption in the future, but for now it should cover the two most likely
+# things users would want to do with a BLOB or CLOB, an equality test or a LIKE
+# query (on a CLOB.)
+#
+# For these expressions, the bind must NOT have the attributes of a LOB bind for
+# DBD::Oracle, otherwise the query will fail. This is done by passing
+# dbd_attrs => undef.
+
+sub _prep_for_execute {
my $self = shift;
- my($source) = @_;
+ my ($op) = @_;
- my %bind_attributes;
+ return $self->next::method(@_)
+ if $op eq 'insert';
- foreach my $column ($source->columns) {
- my $data_type = $source->column_info($column)->{data_type}
- or next;
+ my ($sql, $bind) = $self->next::method(@_);
- my %column_bind_attrs = $self->bind_attribute_by_data_type($data_type);
+ my $lob_bind_indices = { map {
+ (
+ $bind->[$_][0]{sqlt_datatype}
+ and
+ $self->_is_lob_type($bind->[$_][0]{sqlt_datatype})
+ ) ? ( $_ => 1 ) : ()
+ } ( 0 .. $#$bind ) };
- if ($data_type =~ /^[BC]LOB$/i) {
- if ($DBD::Oracle::VERSION eq '1.23') {
- $self->throw_exception(
-"BLOB/CLOB support in DBD::Oracle == 1.23 is broken, use an earlier or later ".
-"version.\n\nSee: https://rt.cpan.org/Public/Bug/Display.html?id=46016\n"
+ return ($sql, $bind) unless %$lob_bind_indices;
+
+ my ($final_sql, @final_binds);
+ if ($op eq 'update') {
+ $self->throw_exception('Update with complex WHERE clauses currently not supported')
+ if $sql =~ /\bWHERE\b .+ \bWHERE\b/xs;
+
+ my $where_sql;
+ ($final_sql, $where_sql) = $sql =~ /^ (.+?) ( \bWHERE\b .+) /xs;
+
+ if (my $set_bind_count = $final_sql =~ y/?//) {
+
+ delete $lob_bind_indices->{$_} for (0 .. ($set_bind_count - 1));
+
+ # bail if only the update part contains blobs
+ return ($sql, $bind) unless %$lob_bind_indices;
+
+ @final_binds = splice @$bind, 0, $set_bind_count;
+ $lob_bind_indices = { map
+ { $_ - $set_bind_count => $lob_bind_indices->{$_} }
+ keys %$lob_bind_indices
+ };
+ }
+
+ # if we got that far - assume the where SQL is all we got
+ # (the first part is already shoved into $final_sql)
+ $sql = $where_sql;
+ }
+ elsif ($op ne 'select' and $op ne 'delete') {
+ $self->throw_exception("Unsupported \$op: $op");
+ }
+
+ my @sql_parts = split /\?/, $sql;
+
+ my $col_equality_re = qr/ (?<=\s) ([\w."]+) (\s*=\s*) $/x;
+
+ for my $b_idx (0 .. $#$bind) {
+ my $bound = $bind->[$b_idx];
+
+ if (
+ $lob_bind_indices->{$b_idx}
+ and
+ my ($col, $eq) = $sql_parts[0] =~ $col_equality_re
+ ) {
+ my $data = $bound->[1];
+
+ $data = "$data" if ref $data;
+
+ my @parts = unpack '(a2000)*', $data;
+
+ my @sql_frag;
+
+ for my $idx (0..$#parts) {
+ push @sql_frag, sprintf (
+ 'UTL_RAW.CAST_TO_VARCHAR2(RAWTOHEX(DBMS_LOB.SUBSTR(%s, 2000, %d))) = ?',
+ $col, ($idx*2000 + 1),
);
}
- $column_bind_attrs{'ora_type'} = uc($data_type) eq 'CLOB'
- ? DBD::Oracle::ORA_CLOB()
- : DBD::Oracle::ORA_BLOB()
+ my $sql_frag = '( ' . (join ' AND ', @sql_frag) . ' )';
+
+ $sql_parts[0] =~ s/$col_equality_re/$sql_frag/;
+
+ $final_sql .= shift @sql_parts;
+
+ for my $idx (0..$#parts) {
+ push @final_binds, [
+ {
+ %{ $bound->[0] },
+ _ora_lob_autosplit_part => $idx,
+ dbd_attrs => undef,
+ },
+ $parts[$idx]
+ ];
+ }
+ }
+ else {
+ $final_sql .= shift(@sql_parts) . '?';
+ push @final_binds, $lob_bind_indices->{$b_idx}
+ ? [
+ {
+ %{ $bound->[0] },
+ dbd_attrs => undef,
+ },
+ $bound->[1],
+ ] : $bound
;
- $column_bind_attrs{'ora_field'} = $column;
}
+ }
- $bind_attributes{$column} = \%column_bind_attrs;
+ if (@sql_parts > 1) {
+ carp "There are more placeholders than binds, this should not happen!";
+ @sql_parts = join ('?', @sql_parts);
}
- return \%bind_attributes;
+ $final_sql .= $sql_parts[0];
+
+ return ($final_sql, \@final_binds);
}
-sub _svp_begin {
+# Savepoints stuff.
+
+sub _exec_svp_begin {
my ($self, $name) = @_;
- $self->_get_dbh->do("SAVEPOINT $name");
+ $self->_dbh->do("SAVEPOINT $name");
}
# Oracle automatically releases a savepoint when you start another one with the
# same name.
-sub _svp_release { 1 }
+sub _exec_svp_release { 1 }
-sub _svp_rollback {
+sub _exec_svp_rollback {
my ($self, $name) = @_;
- $self->_get_dbh->do("ROLLBACK TO SAVEPOINT $name")
+ $self->_dbh->do("ROLLBACK TO SAVEPOINT $name")
}
=head2 relname_to_table_alias
my $alias = $self->next::method(@_);
- return $self->sql_maker->_shorten_identifier($alias, [$relname]);
+ # we need to shorten here in addition to the shortening in SQLA itself,
+ # since the final relnames are a crucial for the join optimizer
+ return $self->sql_maker->_shorten_identifier($alias);
}
=head2 with_deferred_fk_checks
# person me
# CONNECT BY
# parentid = prior persionid
-
+
connect_by_nocycle => { parentid => 'prior personid' }
=head1 AUTHOR
-See L<DBIx::Class/CONTRIBUTORS>.
+See L<DBIx::Class/AUTHOR> and L<DBIx::Class/CONTRIBUTORS>.
=head1 LICENSE
=cut
1;
+# vim:sts=2 sw=2:
projects / dbsrgits/DBIx-Class.git / blobdiff