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DBI.pm
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# $Id$
# vim: ts=8:sw=4:et
#
# Copyright (c) 1994-2024 Tim Bunce Ireland
#
# See COPYRIGHT section in pod text below for usage and distribution rights.
#
package DBI;
require 5.008001;
use strict;
use warnings;
our ($XS_VERSION, $VERSION);
BEGIN {
$VERSION = "1.644"; # ==> ALSO update the version in the pod text below!
$XS_VERSION = $VERSION;
$VERSION =~ tr/_//d;
}
=head1 NAME
DBI - Database independent interface for Perl
=head1 SYNOPSIS
use DBI;
@driver_names = DBI->available_drivers;
%drivers = DBI->installed_drivers;
@data_sources = DBI->data_sources($driver_name, \%attr);
$dbh = DBI->connect($data_source, $username, $auth, \%attr);
$rv = $dbh->do($statement);
$rv = $dbh->do($statement, \%attr);
$rv = $dbh->do($statement, \%attr, @bind_values);
$ary_ref = $dbh->selectall_arrayref($statement);
$hash_ref = $dbh->selectall_hashref($statement, $key_field);
$ary_ref = $dbh->selectcol_arrayref($statement);
$ary_ref = $dbh->selectcol_arrayref($statement, \%attr);
@row_ary = $dbh->selectrow_array($statement);
$ary_ref = $dbh->selectrow_arrayref($statement);
$hash_ref = $dbh->selectrow_hashref($statement);
$sth = $dbh->prepare($statement);
$sth = $dbh->prepare_cached($statement);
$rc = $sth->bind_param($p_num, $bind_value);
$rc = $sth->bind_param($p_num, $bind_value, $bind_type);
$rc = $sth->bind_param($p_num, $bind_value, \%attr);
$rv = $sth->execute;
$rv = $sth->execute(@bind_values);
$rv = $sth->execute_array(\%attr, ...);
$rc = $sth->bind_col($col_num, \$col_variable);
$rc = $sth->bind_columns(@list_of_refs_to_vars_to_bind);
@row_ary = $sth->fetchrow_array;
$ary_ref = $sth->fetchrow_arrayref;
$hash_ref = $sth->fetchrow_hashref;
$ary_ref = $sth->fetchall_arrayref;
$ary_ref = $sth->fetchall_arrayref( $slice, $max_rows );
$hash_ref = $sth->fetchall_hashref( $key_field );
$rv = $sth->rows;
$rc = $dbh->begin_work;
$rc = $dbh->commit;
$rc = $dbh->rollback;
$quoted_string = $dbh->quote($string);
$rc = $h->err;
$str = $h->errstr;
$rv = $h->state;
$rc = $dbh->disconnect;
I<The synopsis above only lists the major methods and parameters.>
=head2 GETTING HELP
=head3 General
Before asking any questions, reread this document, consult the archives and
read the DBI FAQ. The archives are listed at the end of this document and on
the DBI home page L<http://dbi.perl.org/support/>
You might also like to read the Advanced DBI Tutorial at
L<http://www.slideshare.net/Tim.Bunce/dbi-advanced-tutorial-2007>
To help you make the best use of the dbi-users mailing list,
and any other lists or forums you may use, I recommend that you read
"Getting Answers" by Mike Ash: L<http://mikeash.com/getting_answers.html>.
=head3 Mailing Lists
If you have questions about DBI, or DBD driver modules, you can get
help from the I<[email protected]> mailing list. This is the best way to get
help. You don't have to subscribe to the list in order to post, though I'd
recommend it. You can get help on subscribing and using the list by emailing
Please note that Tim Bunce does not maintain the mailing lists or the
web pages (generous volunteers do that). So please don't send mail
directly to him; he just doesn't have the time to answer questions
personally. The I<dbi-users> mailing list has lots of experienced
people who should be able to help you if you need it. If you do email
Tim he is very likely to just forward it to the mailing list.
=head3 IRC
DBI IRC Channel: #dbi on irc.perl.org (L<irc://irc.perl.org/#dbi>)
=for html <a href="http://chat.mibbit.com/#[email protected]">(click for instant chatroom login)</a>
=head3 Online
StackOverflow has a DBI tag L<https://stackoverflow.com/questions/tagged/dbi>
with over 800 questions.
The DBI home page at L<https://dbi.perl.org/> might be worth a visit.
It includes links to other resources, but I<is rather out-dated>.
=head3 Reporting a Bug
If you think you've found a bug then please read
"How to Report Bugs Effectively" by Simon Tatham:
L<https://www.chiark.greenend.org.uk/~sgtatham/bugs.html>.
If you think you've found a memory leak then read L</Memory Leaks>.
Your problem is most likely related to the specific DBD driver module you're
using. If that's the case then click on the 'Bugs' link on the L<https://metacpan.org>
page for your driver. Only submit a bug report against the DBI itself if you're
sure that your issue isn't related to the driver you're using.
=head2 NOTES
This is the DBI specification that corresponds to DBI version 1.644
(see L<DBI::Changes> for details).
The DBI is evolving at a steady pace, so it's good to check that
you have the latest copy.
The significant user-visible changes in each release are documented
in the L<DBI::Changes> module so you can read them by executing
C<perldoc DBI::Changes>.
Some DBI changes require changes in the drivers, but the drivers
can take some time to catch up. Newer versions of the DBI have
added features that may not yet be supported by the drivers you
use. Talk to the authors of your drivers if you need a new feature
that is not yet supported.
Features added after DBI 1.21 (February 2002) are marked in the
text with the version number of the DBI release they first appeared in.
Extensions to the DBI API often use the C<DBIx::*> namespace.
See L</Naming Conventions and Name Space>. DBI extension modules
can be found at L<https://metacpan.org/search?q=DBIx>. And all modules
related to the DBI can be found at L<https://metacpan.org/search?q=DBI>.
=cut
# The POD text continues at the end of the file.
use Scalar::Util ();
use Carp();
use XSLoader ();
use Exporter ();
our (@ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
BEGIN {
@ISA = qw(Exporter);
# Make some utility functions available if asked for
@EXPORT = (); # we export nothing by default
@EXPORT_OK = qw(%DBI %DBI_methods hash); # also populated by export_ok_tags:
%EXPORT_TAGS = (
sql_types => [ qw(
SQL_GUID
SQL_WLONGVARCHAR
SQL_WVARCHAR
SQL_WCHAR
SQL_BIGINT
SQL_BIT
SQL_TINYINT
SQL_LONGVARBINARY
SQL_VARBINARY
SQL_BINARY
SQL_LONGVARCHAR
SQL_UNKNOWN_TYPE
SQL_ALL_TYPES
SQL_CHAR
SQL_NUMERIC
SQL_DECIMAL
SQL_INTEGER
SQL_SMALLINT
SQL_FLOAT
SQL_REAL
SQL_DOUBLE
SQL_DATETIME
SQL_DATE
SQL_INTERVAL
SQL_TIME
SQL_TIMESTAMP
SQL_VARCHAR
SQL_BOOLEAN
SQL_UDT
SQL_UDT_LOCATOR
SQL_ROW
SQL_REF
SQL_BLOB
SQL_BLOB_LOCATOR
SQL_CLOB
SQL_CLOB_LOCATOR
SQL_ARRAY
SQL_ARRAY_LOCATOR
SQL_MULTISET
SQL_MULTISET_LOCATOR
SQL_TYPE_DATE
SQL_TYPE_TIME
SQL_TYPE_TIMESTAMP
SQL_TYPE_TIME_WITH_TIMEZONE
SQL_TYPE_TIMESTAMP_WITH_TIMEZONE
SQL_INTERVAL_YEAR
SQL_INTERVAL_MONTH
SQL_INTERVAL_DAY
SQL_INTERVAL_HOUR
SQL_INTERVAL_MINUTE
SQL_INTERVAL_SECOND
SQL_INTERVAL_YEAR_TO_MONTH
SQL_INTERVAL_DAY_TO_HOUR
SQL_INTERVAL_DAY_TO_MINUTE
SQL_INTERVAL_DAY_TO_SECOND
SQL_INTERVAL_HOUR_TO_MINUTE
SQL_INTERVAL_HOUR_TO_SECOND
SQL_INTERVAL_MINUTE_TO_SECOND
) ],
sql_cursor_types => [ qw(
SQL_CURSOR_FORWARD_ONLY
SQL_CURSOR_KEYSET_DRIVEN
SQL_CURSOR_DYNAMIC
SQL_CURSOR_STATIC
SQL_CURSOR_TYPE_DEFAULT
) ], # for ODBC cursor types
utils => [ qw(
neat neat_list $neat_maxlen dump_results looks_like_number
data_string_diff data_string_desc data_diff sql_type_cast
DBIstcf_DISCARD_STRING
DBIstcf_STRICT
) ],
profile => [ qw(
dbi_profile dbi_profile_merge dbi_profile_merge_nodes dbi_time
) ], # notionally "in" DBI::Profile and normally imported from there
);
$DBI::dbi_debug = 0; # mixture of bit fields and int sub-fields
$DBI::neat_maxlen = 1000;
$DBI::stderr = 2_000_000_000; # a very round number below 2**31
# If you get an error here like "Can't find loadable object ..."
# then you haven't installed the DBI correctly. Read the README
# then install it again.
if ( $ENV{DBI_PUREPERL} ) {
eval { XSLoader::load('DBI', $XS_VERSION) } if $ENV{DBI_PUREPERL} == 1;
require DBI::PurePerl if $@ or $ENV{DBI_PUREPERL} >= 2;
$DBI::PurePerl ||= 0; # just to silence "only used once" warnings
}
else {
XSLoader::load( 'DBI', $XS_VERSION);
}
$EXPORT_TAGS{preparse_flags} = [ grep { /^DBIpp_\w\w_/ } keys %DBI:: ];
Exporter::export_ok_tags(keys %EXPORT_TAGS);
}
# Alias some handle methods to also be DBI class methods
for (qw(trace_msg set_err parse_trace_flag parse_trace_flags)) {
no strict;
*$_ = \&{"DBD::_::common::$_"};
}
DBI->trace(split /=/, $ENV{DBI_TRACE}, 2) if $ENV{DBI_TRACE};
$DBI::connect_via ||= "connect";
# check if user wants a persistent database connection ( Apache + mod_perl )
if ($INC{'Apache/DBI.pm'} && $ENV{MOD_PERL}) {
$DBI::connect_via = "Apache::DBI::connect";
DBI->trace_msg("DBI connect via $DBI::connect_via in $INC{'Apache/DBI.pm'}\n");
}
%DBI::installed_drh = (); # maps driver names to installed driver handles
sub installed_drivers { %DBI::installed_drh }
%DBI::installed_methods = (); # XXX undocumented, may change
sub installed_methods { %DBI::installed_methods }
# Setup special DBI dynamic variables. See DBI::var::FETCH for details.
# These are dynamically associated with the last handle used.
tie $DBI::err, 'DBI::var', '*err'; # special case: referenced via IHA list
tie $DBI::state, 'DBI::var', '"state'; # special case: referenced via IHA list
tie $DBI::lasth, 'DBI::var', '!lasth'; # special case: return boolean
tie $DBI::errstr, 'DBI::var', '&errstr'; # call &errstr in last used pkg
tie $DBI::rows, 'DBI::var', '&rows'; # call &rows in last used pkg
sub DBI::var::TIESCALAR{ my $var = $_[1]; bless \$var, 'DBI::var'; }
sub DBI::var::STORE { Carp::croak("Can't modify \$DBI::${$_[0]} special variable") }
# --- Driver Specific Prefix Registry ---
my $dbd_prefix_registry = {
ad_ => { class => 'DBD::AnyData', },
ad2_ => { class => 'DBD::AnyData2', },
ado_ => { class => 'DBD::ADO', },
amzn_ => { class => 'DBD::Amazon', },
best_ => { class => 'DBD::BestWins', },
csv_ => { class => 'DBD::CSV', },
cubrid_ => { class => 'DBD::cubrid', },
db2_ => { class => 'DBD::DB2', },
dbi_ => { class => 'DBI', },
dbm_ => { class => 'DBD::DBM', },
df_ => { class => 'DBD::DF', },
examplep_ => { class => 'DBD::ExampleP', },
f_ => { class => 'DBD::File', },
file_ => { class => 'DBD::TextFile', },
go_ => { class => 'DBD::Gofer', },
ib_ => { class => 'DBD::InterBase', },
ing_ => { class => 'DBD::Ingres', },
ix_ => { class => 'DBD::Informix', },
jdbc_ => { class => 'DBD::JDBC', },
mariadb_ => { class => 'DBD::MariaDB', },
mem_ => { class => 'DBD::Mem', },
mo_ => { class => 'DBD::MO', },
monetdb_ => { class => 'DBD::monetdb', },
msql_ => { class => 'DBD::mSQL', },
mvsftp_ => { class => 'DBD::MVS_FTPSQL', },
mysql_ => { class => 'DBD::mysql', },
multi_ => { class => 'DBD::Multi' },
mx_ => { class => 'DBD::Multiplex', },
neo_ => { class => 'DBD::Neo4p', },
nullp_ => { class => 'DBD::NullP', },
odbc_ => { class => 'DBD::ODBC', },
ora_ => { class => 'DBD::Oracle', },
pg_ => { class => 'DBD::Pg', },
pgpp_ => { class => 'DBD::PgPP', },
plb_ => { class => 'DBD::Plibdata', },
po_ => { class => 'DBD::PO', },
proxy_ => { class => 'DBD::Proxy', },
ram_ => { class => 'DBD::RAM', },
rdb_ => { class => 'DBD::RDB', },
sapdb_ => { class => 'DBD::SAP_DB', },
snmp_ => { class => 'DBD::SNMP', },
solid_ => { class => 'DBD::Solid', },
spatialite_ => { class => 'DBD::Spatialite', },
sponge_ => { class => 'DBD::Sponge', },
sql_ => { class => 'DBI::DBD::SqlEngine', },
sqlite_ => { class => 'DBD::SQLite', },
syb_ => { class => 'DBD::Sybase', },
sys_ => { class => 'DBD::Sys', },
tdat_ => { class => 'DBD::Teradata', },
tmpl_ => { class => 'DBD::Template', },
tmplss_ => { class => 'DBD::TemplateSS', },
tree_ => { class => 'DBD::TreeData', },
tuber_ => { class => 'DBD::Tuber', },
uni_ => { class => 'DBD::Unify', },
vt_ => { class => 'DBD::Vt', },
wmi_ => { class => 'DBD::WMI', },
x_ => { }, # for private use
xbase_ => { class => 'DBD::XBase', },
xmlsimple_ => { class => 'DBD::XMLSimple', },
xl_ => { class => 'DBD::Excel', },
yaswi_ => { class => 'DBD::Yaswi', },
};
my %dbd_class_registry = map { $dbd_prefix_registry->{$_}->{class} => { prefix => $_ } }
grep { exists $dbd_prefix_registry->{$_}->{class} }
keys %{$dbd_prefix_registry};
sub dump_dbd_registry {
require Data::Dumper;
local $Data::Dumper::Sortkeys=1;
local $Data::Dumper::Indent=1;
print Data::Dumper->Dump([$dbd_prefix_registry], [qw($dbd_prefix_registry)]);
}
# --- Dynamically create the DBI Standard Interface
my $keeperr = { O=>0x0004 };
%DBI::DBI_methods = ( # Define the DBI interface methods per class:
common => { # Interface methods common to all DBI handle classes
'DESTROY' => { O=>0x004|0x10000 },
'CLEAR' => $keeperr,
'EXISTS' => $keeperr,
'FETCH' => { O=>0x0404 },
'FETCH_many' => { O=>0x0404 },
'FIRSTKEY' => $keeperr,
'NEXTKEY' => $keeperr,
'STORE' => { O=>0x0418 | 0x4 },
'DELETE' => { O=>0x0404 },
can => { O=>0x0100 }, # special case, see dispatch
debug => { U =>[1,2,'[$debug_level]'], O=>0x0004 }, # old name for trace
dump_handle => { U =>[1,3,'[$message [, $level]]'], O=>0x0004 },
err => $keeperr,
errstr => $keeperr,
state => $keeperr,
func => { O=>0x0006 },
parse_trace_flag => { U =>[2,2,'$name'], O=>0x0404, T=>8 },
parse_trace_flags => { U =>[2,2,'$flags'], O=>0x0404, T=>8 },
private_data => { U =>[1,1], O=>0x0004 },
set_err => { U =>[3,6,'$err, $errmsg [, $state, $method, $rv]'], O=>0x0010 },
trace => { U =>[1,3,'[$trace_level, [$filename]]'], O=>0x0004 },
trace_msg => { U =>[2,3,'$message_text [, $min_level ]' ], O=>0x0004, T=>8 },
swap_inner_handle => { U =>[2,3,'$h [, $allow_reparent ]'] },
private_attribute_info => { },
visit_child_handles => { U => [2,3,'$coderef [, $info ]'], O=>0x0404, T=>4 },
},
dr => { # Database Driver Interface
'connect' => { U =>[1,5,'[$db [,$user [,$passwd [,\%attr]]]]'], H=>3, O=>0x8000, T=>0x200 },
'connect_cached'=>{U=>[1,5,'[$db [,$user [,$passwd [,\%attr]]]]'], H=>3, O=>0x8000, T=>0x200 },
'disconnect_all'=>{ U =>[1,1], O=>0x0800, T=>0x200 },
data_sources => { U =>[1,2,'[\%attr]' ], O=>0x0800, T=>0x200 },
default_user => { U =>[3,4,'$user, $pass [, \%attr]' ], T=>0x200 },
dbixs_revision => $keeperr,
},
db => { # Database Session Class Interface
data_sources => { U =>[1,2,'[\%attr]' ], O=>0x0200 },
take_imp_data => { U =>[1,1], O=>0x10000 },
clone => { U =>[1,2,'[\%attr]'], T=>0x200 },
connected => { U =>[1,0], O => 0x0004, T=>0x200, H=>3 },
begin_work => { U =>[1,2,'[ \%attr ]'], O=>0x0400, T=>0x1000 },
commit => { U =>[1,1], O=>0x0480|0x0800, T=>0x1000 },
rollback => { U =>[1,1], O=>0x0480|0x0800, T=>0x1000 },
'do' => { U =>[2,0,'$statement [, \%attr [, @bind_params ] ]'], O=>0x3200 },
last_insert_id => { U =>[1,6,'[$catalog [,$schema [,$table_name [,$field_name [, \%attr ]]]]]'], O=>0x2800 },
preparse => { }, # XXX
prepare => { U =>[2,3,'$statement [, \%attr]'], O=>0xA200 },
prepare_cached => { U =>[2,4,'$statement [, \%attr [, $if_active ] ]'], O=>0xA200 },
selectrow_array => { U =>[2,0,'$statement [, \%attr [, @bind_params ] ]'], O=>0x2000 },
selectrow_arrayref=>{U =>[2,0,'$statement [, \%attr [, @bind_params ] ]'], O=>0x2000 },
selectrow_hashref=>{ U =>[2,0,'$statement [, \%attr [, @bind_params ] ]'], O=>0x2000 },
selectall_arrayref=>{U =>[2,0,'$statement [, \%attr [, @bind_params ] ]'], O=>0x2000 },
selectall_array =>{U =>[2,0,'$statement [, \%attr [, @bind_params ] ]'], O=>0x2000 },
selectall_hashref=>{ U =>[3,0,'$statement, $keyfield [, \%attr [, @bind_params ] ]'], O=>0x2000 },
selectcol_arrayref=>{U =>[2,0,'$statement [, \%attr [, @bind_params ] ]'], O=>0x2000 },
ping => { U =>[1,1], O=>0x0404 },
disconnect => { U =>[1,1], O=>0x0400|0x0800|0x10000, T=>0x200 },
quote => { U =>[2,3, '$string [, $data_type ]' ], O=>0x0430, T=>2 },
quote_identifier=> { U =>[2,6, '$name [, ...] [, \%attr ]' ], O=>0x0430, T=>2 },
rows => $keeperr,
tables => { U =>[1,6,'$catalog, $schema, $table, $type [, \%attr ]' ], O=>0x2200 },
table_info => { U =>[1,6,'$catalog, $schema, $table, $type [, \%attr ]' ], O=>0x2200|0x8800 },
column_info => { U =>[5,6,'$catalog, $schema, $table, $column [, \%attr ]'],O=>0x2200|0x8800 },
primary_key_info=> { U =>[4,5,'$catalog, $schema, $table [, \%attr ]' ], O=>0x2200|0x8800 },
primary_key => { U =>[4,5,'$catalog, $schema, $table [, \%attr ]' ], O=>0x2200 },
foreign_key_info=> { U =>[7,8,'$pk_catalog, $pk_schema, $pk_table, $fk_catalog, $fk_schema, $fk_table [, \%attr ]' ], O=>0x2200|0x8800 },
statistics_info => { U =>[6,7,'$catalog, $schema, $table, $unique_only, $quick, [, \%attr ]' ], O=>0x2200|0x8800 },
type_info_all => { U =>[1,1], O=>0x2200|0x0800 },
type_info => { U =>[1,2,'$data_type'], O=>0x2200 },
get_info => { U =>[2,2,'$info_type'], O=>0x2200|0x0800 },
},
st => { # Statement Class Interface
bind_col => { U =>[3,4,'$column, \\$var [, \%attr]'] },
bind_columns => { U =>[2,0,'\\$var1 [, \\$var2, ...]'] },
bind_param => { U =>[3,4,'$parameter, $var [, \%attr]'] },
bind_param_inout=> { U =>[4,5,'$parameter, \\$var, $maxlen, [, \%attr]'] },
execute => { U =>[1,0,'[@args]'], O=>0x1040 },
last_insert_id => { U =>[1,6,'[$catalog [,$schema [,$table_name [,$field_name [, \%attr ]]]]]'], O=>0x2800 },
bind_param_array => { U =>[3,4,'$parameter, $var [, \%attr]'] },
bind_param_inout_array => { U =>[4,5,'$parameter, \\@var, $maxlen, [, \%attr]'] },
execute_array => { U =>[2,0,'\\%attribs [, @args]'], O=>0x1040|0x4000 },
execute_for_fetch => { U =>[2,3,'$fetch_sub [, $tuple_status]'], O=>0x1040|0x4000 },
fetch => undef, # alias for fetchrow_arrayref
fetchrow_arrayref => undef,
fetchrow_hashref => undef,
fetchrow_array => undef,
fetchrow => undef, # old alias for fetchrow_array
fetchall_arrayref => { U =>[1,3, '[ $slice [, $max_rows]]'] },
fetchall_hashref => { U =>[2,2,'$key_field'] },
blob_read => { U =>[4,5,'$field, $offset, $len [, \\$buf [, $bufoffset]]'] },
blob_copy_to_file => { U =>[3,3,'$field, $filename_or_handleref'] },
dump_results => { U =>[1,5,'$maxfieldlen, $linesep, $fieldsep, $filehandle'] },
more_results => { U =>[1,1] },
finish => { U =>[1,1] },
cancel => { U =>[1,1], O=>0x0800 },
rows => $keeperr,
_get_fbav => undef,
_set_fbav => { T=>6 },
},
);
while ( my ($class, $meths) = each %DBI::DBI_methods ) {
my $ima_trace = 0+($ENV{DBI_IMA_TRACE}||0);
while ( my ($method, $info) = each %$meths ) {
my $fullmeth = "DBI::${class}::$method";
if (($DBI::dbi_debug & 0xF) == 15) { # quick hack to list DBI methods
# and optionally filter by IMA flags
my $O = $info->{O}||0;
printf "0x%04x %-20s\n", $O, $fullmeth
unless $ima_trace && !($O & $ima_trace);
}
DBI->_install_method($fullmeth, 'DBI.pm', $info);
}
}
{
package DBI::common;
@DBI::dr::ISA = ('DBI::common');
@DBI::db::ISA = ('DBI::common');
@DBI::st::ISA = ('DBI::common');
}
# End of init code
END {
return unless defined &DBI::trace_msg; # return unless bootstrap'd ok
local ($!,$?);
DBI->trace_msg(sprintf(" -- DBI::END (\$\@: %s, \$!: %s)\n", $@||'', $!||''), 2);
# Let drivers know why we are calling disconnect_all:
$DBI::PERL_ENDING = $DBI::PERL_ENDING = 1; # avoid typo warning
DBI->disconnect_all() if %DBI::installed_drh;
}
sub CLONE {
_clone_dbis() unless $DBI::PurePerl; # clone the DBIS structure
DBI->trace_msg("CLONE DBI for new thread\n");
while ( my ($driver, $drh) = each %DBI::installed_drh) {
no strict 'refs';
next if defined &{"DBD::${driver}::CLONE"};
warn("$driver has no driver CLONE() function so is unsafe threaded\n");
}
%DBI::installed_drh = (); # clear loaded drivers so they have a chance to reinitialize
}
sub parse_dsn {
my ($class, $dsn) = @_;
$dsn =~ s/^(dbi):(\w*?)(?:\((.*?)\))?://i or return;
my ($scheme, $driver, $attr, $attr_hash) = (lc($1), $2, $3);
$driver ||= $ENV{DBI_DRIVER} || '';
$attr_hash = { split /\s*=>?\s*|\s*,\s*/, $attr, -1 } if $attr;
return ($scheme, $driver, $attr, $attr_hash, $dsn);
}
sub visit_handles {
my ($class, $code, $outer_info) = @_;
$outer_info = {} if not defined $outer_info;
my %drh = DBI->installed_drivers;
for my $h (values %drh) {
my $child_info = $code->($h, $outer_info)
or next;
$h->visit_child_handles($code, $child_info);
}
return $outer_info;
}
# --- The DBI->connect Front Door methods
sub connect_cached {
# For library code using connect_cached() with mod_perl
# we redirect those calls to Apache::DBI::connect() as well
my ($class, $dsn, $user, $pass, $attr) = @_;
my $dbi_connect_method = ($DBI::connect_via eq "Apache::DBI::connect")
? 'Apache::DBI::connect' : 'connect_cached';
$attr = {
$attr ? %$attr : (), # clone, don't modify callers data
dbi_connect_method => $dbi_connect_method,
};
return $class->connect($dsn, $user, $pass, $attr);
}
sub connect {
my $class = shift;
my ($dsn, $user, $pass, $attr, $old_driver) = my @orig_args = @_;
my $driver;
if ($attr and !ref($attr)) { # switch $old_driver<->$attr if called in old style
Carp::carp("DBI->connect using 'old-style' syntax is deprecated and will be an error in future versions");
($old_driver, $attr) = ($attr, $old_driver);
}
my $connect_meth = $attr->{dbi_connect_method};
$connect_meth ||= $DBI::connect_via; # fallback to default
$dsn ||= $ENV{DBI_DSN} || $ENV{DBI_DBNAME} || '' unless $old_driver;
if ($DBI::dbi_debug) {
no warnings;
pop @_ if $connect_meth ne 'connect';
my @args = @_; $args[2] = '****'; # hide password
DBI->trace_msg(" -> $class->$connect_meth(".join(", ",@args).")\n");
}
Carp::croak('Usage: $class->connect([$dsn [,$user [,$passwd [,\%attr]]]])')
if (ref $old_driver or ($attr and not ref $attr) or
(ref $pass and not defined Scalar::Util::blessed($pass)));
# extract dbi:driver prefix from $dsn into $1
my $orig_dsn = $dsn;
$dsn =~ s/^dbi:(\w*?)(?:\((.*?)\))?://i
or '' =~ /()/; # ensure $1 etc are empty if match fails
my $driver_attrib_spec = $2 || '';
# Set $driver. Old style driver, if specified, overrides new dsn style.
$driver = $old_driver || $1 || $ENV{DBI_DRIVER}
or Carp::croak("Can't connect to data source '$orig_dsn' "
."because I can't work out what driver to use "
."(it doesn't seem to contain a 'dbi:driver:' prefix "
."and the DBI_DRIVER env var is not set)");
my $proxy;
if ($ENV{DBI_AUTOPROXY} && $driver ne 'Proxy' && $driver ne 'Sponge' && $driver ne 'Switch') {
my $dbi_autoproxy = $ENV{DBI_AUTOPROXY};
$proxy = 'Proxy';
if ($dbi_autoproxy =~ s/^dbi:(\w*?)(?:\((.*?)\))?://i) {
$proxy = $1;
$driver_attrib_spec = join ",",
($driver_attrib_spec) ? $driver_attrib_spec : (),
($2 ) ? $2 : ();
}
$dsn = "$dbi_autoproxy;dsn=dbi:$driver:$dsn";
$driver = $proxy;
DBI->trace_msg(" DBI_AUTOPROXY: dbi:$driver($driver_attrib_spec):$dsn\n");
}
# avoid recursion if proxy calls DBI->connect itself
local $ENV{DBI_AUTOPROXY} if $ENV{DBI_AUTOPROXY};
my %attributes; # take a copy we can delete from
if ($old_driver) {
%attributes = %$attr if $attr;
}
else { # new-style connect so new default semantics
%attributes = (
PrintError => 1,
AutoCommit => 1,
ref $attr ? %$attr : (),
# attributes in DSN take precedence over \%attr connect parameter
$driver_attrib_spec ? (split /\s*=>?\s*|\s*,\s*/, $driver_attrib_spec, -1) : (),
);
}
$attr = \%attributes; # now set $attr to refer to our local copy
my $drh = $DBI::installed_drh{$driver} || $class->install_driver($driver)
or die "panic: $class->install_driver($driver) failed";
# attributes in DSN take precedence over \%attr connect parameter
$user = $attr->{Username} if defined $attr->{Username};
$pass = $attr->{Password} if defined $attr->{Password};
delete $attr->{Password}; # always delete Password as closure stores it securely
if ( !(defined $user && defined $pass) ) {
($user, $pass) = $drh->default_user($user, $pass, $attr);
}
$attr->{Username} = $user; # force the Username to be the actual one used
my $connect_closure = sub {
my ($old_dbh, $override_attr) = @_;
#use Data::Dumper;
#warn "connect_closure: ".Data::Dumper::Dumper([$attr,\%attributes, $override_attr]);
my $dbh;
unless ($dbh = $drh->$connect_meth($dsn, $user, $pass, $attr)) {
$user = '' if !defined $user;
$dsn = '' if !defined $dsn;
# $drh->errstr isn't safe here because $dbh->DESTROY may not have
# been called yet and so the dbh errstr would not have been copied
# up to the drh errstr. Certainly true for connect_cached!
my $errstr = $DBI::errstr;
# Getting '(no error string)' here is a symptom of a ref loop
$errstr = '(no error string)' if !defined $errstr;
my $msg = "$class connect('$dsn','$user',...) failed: $errstr";
DBI->trace_msg(" $msg\n");
# XXX HandleWarn
unless ($attr->{HandleError} && $attr->{HandleError}->($msg, $drh, $dbh)) {
Carp::croak($msg) if $attr->{RaiseError};
Carp::carp ($msg) if $attr->{PrintError};
}
$! = 0; # for the daft people who do DBI->connect(...) || die "$!";
return $dbh; # normally undef, but HandleError could change it
}
# merge any attribute overrides but don't change $attr itself (for closure)
my $apply = { ($override_attr) ? (%$attr, %$override_attr ) : %$attr };
# handle basic RootClass subclassing:
my $rebless_class = $apply->{RootClass} || ($class ne 'DBI' ? $class : '');
if ($rebless_class) {
no strict 'refs';
if ($apply->{RootClass}) { # explicit attribute (ie not static method call class)
delete $apply->{RootClass};
DBI::_load_class($rebless_class, 0);
}
unless (@{"$rebless_class\::db::ISA"} && @{"$rebless_class\::st::ISA"}) {
Carp::carp("DBI subclasses '$rebless_class\::db' and ::st are not setup, RootClass ignored");
$rebless_class = undef;
$class = 'DBI';
}
else {
$dbh->{RootClass} = $rebless_class; # $dbh->STORE called via plain DBI::db
DBI::_set_isa([$rebless_class], 'DBI'); # sets up both '::db' and '::st'
DBI::_rebless($dbh, $rebless_class); # appends '::db'
}
}
if (%$apply) {
if ($apply->{DbTypeSubclass}) {
my $DbTypeSubclass = delete $apply->{DbTypeSubclass};
DBI::_rebless_dbtype_subclass($dbh, $rebless_class||$class, $DbTypeSubclass);
}
my $a;
foreach $a (qw(Profile RaiseError PrintError AutoCommit)) { # do these first
next unless exists $apply->{$a};
$dbh->{$a} = delete $apply->{$a};
}
while ( my ($a, $v) = each %$apply) {
eval { $dbh->{$a} = $v }; # assign in void context to avoid re-FETCH
warn $@ if $@;
}
}
# confirm to driver (ie if subclassed) that we've connected successfully
# and finished the attribute setup. pass in the original arguments
$dbh->connected(@orig_args); #if ref $dbh ne 'DBI::db' or $proxy;
DBI->trace_msg(" <- connect= $dbh\n") if $DBI::dbi_debug & 0xF;
return $dbh;
};
my $dbh = &$connect_closure(undef, undef);
$dbh->{dbi_connect_closure} = $connect_closure if $dbh;
return $dbh;
}
sub disconnect_all {
keys %DBI::installed_drh; # reset iterator
while ( my ($name, $drh) = each %DBI::installed_drh ) {
$drh->disconnect_all() if ref $drh;
}
}
sub disconnect { # a regular beginners bug
Carp::croak("DBI->disconnect is not a DBI method (read the DBI manual)");
}
sub install_driver { # croaks on failure
my $class = shift;
my($driver, $attr) = @_;
my $drh;
$driver ||= $ENV{DBI_DRIVER} || '';
# allow driver to be specified as a 'dbi:driver:' string
$driver = $1 if $driver =~ s/^DBI:(.*?)://i;
Carp::croak("usage: $class->install_driver(\$driver [, \%attr])")
unless ($driver and @_<=3);
# already installed
return $drh if $drh = $DBI::installed_drh{$driver};
$class->trace_msg(" -> $class->install_driver($driver"
.") for $^O perl=$] pid=$$ ruid=$< euid=$>\n")
if $DBI::dbi_debug & 0xF;
# --- load the code
my $driver_class = "DBD::$driver";
eval qq{package # hide from PAUSE
DBI::_firesafe; # just in case
require $driver_class; # load the driver
};
if ($@) {
my $err = $@;
my $advice = "";
if ($err =~ /Can't find loadable object/) {
$advice = "Perhaps DBD::$driver was statically linked into a new perl binary."
."\nIn which case you need to use that new perl binary."
."\nOr perhaps only the .pm file was installed but not the shared object file."
}
elsif ($err =~ /Can't locate.*?DBD\/$driver\.pm in \@INC/) {
my @drv = $class->available_drivers(1);
$advice = "Perhaps the DBD::$driver perl module hasn't been fully installed,\n"
."or perhaps the capitalisation of '$driver' isn't right.\n"
."Available drivers: ".join(", ", @drv).".";
}
elsif ($err =~ /Can't load .*? for module DBD::/) {
$advice = "Perhaps a required shared library or dll isn't installed where expected";
}
elsif ($err =~ /Can't locate .*? in \@INC/) {
$advice = "Perhaps a module that DBD::$driver requires hasn't been fully installed";
}
Carp::croak("install_driver($driver) failed: $err$advice\n");
}
if ($DBI::dbi_debug & 0xF) {
no strict 'refs';
(my $driver_file = $driver_class) =~ s/::/\//g;
my $dbd_ver = ${"$driver_class\::VERSION"} || "undef";
$class->trace_msg(" install_driver: $driver_class version $dbd_ver"
." loaded from $INC{qq($driver_file.pm)}\n");
}
# --- do some behind-the-scenes checks and setups on the driver
$class->setup_driver($driver_class);
# --- run the driver function
$drh = eval { $driver_class->driver($attr || {}) };
unless ($drh && ref $drh && !$@) {
my $advice = "";
$@ ||= "$driver_class->driver didn't return a handle";
# catch people on case in-sensitive systems using the wrong case
$advice = "\nPerhaps the capitalisation of DBD '$driver' isn't right."
if $@ =~ /locate object method/;
Carp::croak("$driver_class initialisation failed: $@$advice");
}
$DBI::installed_drh{$driver} = $drh;
$class->trace_msg(" <- install_driver= $drh\n") if $DBI::dbi_debug & 0xF;
$drh;
}
*driver = \&install_driver; # currently an alias, may change
sub setup_driver {
my ($class, $driver_class) = @_;
my $h_type;
foreach $h_type (qw(dr db st)){
my $h_class = $driver_class."::$h_type";
no strict 'refs';
push @{"${h_class}::ISA"}, "DBD::_::$h_type"
unless UNIVERSAL::isa($h_class, "DBD::_::$h_type");
# The _mem class stuff is (IIRC) a crufty hack for global destruction
# timing issues in early versions of perl5 and possibly no longer needed.
my $mem_class = "DBD::_mem::$h_type";
push @{"${h_class}_mem::ISA"}, $mem_class
unless UNIVERSAL::isa("${h_class}_mem", $mem_class)
or $DBI::PurePerl;
}
}
sub _rebless {
my $dbh = shift;
my ($outer, $inner) = DBI::_handles($dbh);
my $class = shift(@_).'::db';
bless $inner => $class;
bless $outer => $class; # outer last for return
}
sub _set_isa {
my ($classes, $topclass) = @_;
my $trace = DBI->trace_msg(" _set_isa([@$classes])\n");
foreach my $suffix ('::db','::st') {
my $previous = $topclass || 'DBI'; # trees are rooted here
foreach my $class (@$classes) {
my $base_class = $previous.$suffix;
my $sub_class = $class.$suffix;
my $sub_class_isa = "${sub_class}::ISA";
no strict 'refs';
if (@$sub_class_isa) {
DBI->trace_msg(" $sub_class_isa skipped (already set to @$sub_class_isa)\n")
if $trace;
}
else {
@$sub_class_isa = ($base_class) unless @$sub_class_isa;
DBI->trace_msg(" $sub_class_isa = $base_class\n")
if $trace;
}
$previous = $class;
}
}
}
sub _rebless_dbtype_subclass {
my ($dbh, $rootclass, $DbTypeSubclass) = @_;
# determine the db type names for class hierarchy
my @hierarchy = DBI::_dbtype_names($dbh, $DbTypeSubclass);
# add the rootclass prefix to each ('DBI::' or 'MyDBI::' etc)
$_ = $rootclass.'::'.$_ foreach (@hierarchy);
# load the modules from the 'top down'
DBI::_load_class($_, 1) foreach (reverse @hierarchy);
# setup class hierarchy if needed, does both '::db' and '::st'
DBI::_set_isa(\@hierarchy, $rootclass);
# finally bless the handle into the subclass
DBI::_rebless($dbh, $hierarchy[0]);
}
sub _dbtype_names { # list dbtypes for hierarchy, ie Informix=>ADO=>ODBC
my ($dbh, $DbTypeSubclass) = @_;
if ($DbTypeSubclass && $DbTypeSubclass ne '1' && ref $DbTypeSubclass ne 'CODE') {
# treat $DbTypeSubclass as a comma separated list of names
my @dbtypes = split /\s*,\s*/, $DbTypeSubclass;
$dbh->trace_msg(" DbTypeSubclass($DbTypeSubclass)=@dbtypes (explicit)\n");
return @dbtypes;
}
# XXX will call $dbh->get_info(17) (=SQL_DBMS_NAME) in future?
my $driver = $dbh->{Driver}->{Name};
if ( $driver eq 'Proxy' ) {
# XXX Looking into the internals of DBD::Proxy is questionable!
($driver) = $dbh->{proxy_client}->{application} =~ /^DBI:(.+?):/i
or die "Can't determine driver name from proxy";
}
my @dbtypes = (ucfirst($driver));
if ($driver eq 'ODBC' || $driver eq 'ADO') {
# XXX will move these out and make extensible later:
my $_dbtype_name_regexp = 'Oracle'; # eg 'Oracle|Foo|Bar'
my %_dbtype_name_map = (
'Microsoft SQL Server' => 'MSSQL',
'SQL Server' => 'Sybase',
'Adaptive Server Anywhere' => 'ASAny',
'ADABAS D' => 'AdabasD',
);
my $name;
$name = $dbh->func(17, 'GetInfo') # SQL_DBMS_NAME
if $driver eq 'ODBC';
$name = $dbh->{ado_conn}->Properties->Item('DBMS Name')->Value
if $driver eq 'ADO';
die "Can't determine driver name! ($DBI::errstr)\n"
unless $name;
my $dbtype;
if ($_dbtype_name_map{$name}) {
$dbtype = $_dbtype_name_map{$name};
}
else {
if ($name =~ /($_dbtype_name_regexp)/) {
$dbtype = lc($1);
}
else { # generic mangling for other names:
$dbtype = lc($name);
}
$dbtype =~ s/\b(\w)/\U$1/g;
$dbtype =~ s/\W+/_/g;
}
# add ODBC 'behind' ADO
push @dbtypes, 'ODBC' if $driver eq 'ADO';
# add discovered dbtype in front of ADO/ODBC
unshift @dbtypes, $dbtype;
}
@dbtypes = &$DbTypeSubclass($dbh, \@dbtypes)
if (ref $DbTypeSubclass eq 'CODE');
$dbh->trace_msg(" DbTypeSubclass($DbTypeSubclass)=@dbtypes\n");
return @dbtypes;
}
sub _load_class {
my ($load_class, $missing_ok) = @_;
DBI->trace_msg(" _load_class($load_class, $missing_ok)\n", 2);
no strict 'refs';
return 1 if @{"$load_class\::ISA"}; # already loaded/exists
(my $module = $load_class) =~ s!::!/!g;
DBI->trace_msg(" _load_class require $module\n", 2);
eval { require "$module.pm"; };
return 1 unless $@;
return 0 if $missing_ok && $@ =~ /^Can't locate \Q$module.pm\E/;
die $@;
}
sub init_rootclass { # deprecated
return 1;
}
*internal = \&DBD::Switch::dr::driver;