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Man Pages
DBIx::Admin::TableInfo(3) User Contributed Perl Documentation DBIx::Admin::TableInfo(3)

DBIx::Admin::TableInfo - A wrapper for all of table_info(), column_info(), *_key_info()

This is scripts/synopsis.pl:

        #!/usr/bin/env perl

        use strict;
        use warnings;

        use DBI;
        use DBIx::Admin::TableInfo 3.02;

        use Lingua::EN::PluralToSingular 'to_singular';

        use Text::Table::Manifold ':constants';

        # ---------------------

        my($attr)              = {};
        $$attr{sqlite_unicode} = 1 if ($ENV{DBI_DSN} =~ /SQLite/i);
        my($dbh)               = DBI -> connect($ENV{DBI_DSN}, $ENV{DBI_USER}, $ENV{DBI_PASS}, $attr);
        my($vendor_name)       = uc $dbh -> get_info(17);
        my($info)              = DBIx::Admin::TableInfo -> new(dbh => $dbh) -> info;

        $dbh -> do('pragma foreign_keys = on') if ($ENV{DBI_DSN} =~ /SQLite/i);

        my($temp_1, $temp_2, $temp_3);

        if ($vendor_name eq 'MYSQL')
        {
                $temp_1 = 'PKTABLE_NAME';
                $temp_2 = 'FKTABLE_NAME';
                $temp_3 = 'FKCOLUMN_NAME';
        }
        else # ORACLE && POSTGRESQL && SQLITE (at least).
        {
                $temp_1 = 'UK_TABLE_NAME';
                $temp_2 = 'FK_TABLE_NAME';
                $temp_3 = 'FK_COLUMN_NAME';
        }

        my(%special_fk_column) =
        (
                spouse_id => 'person_id',
        );

        my($destination_port);
        my($fk_column_name, $fk_table_name, %foreign_key);
        my($pk_table_name, $primary_key_name);
        my($singular_name, $source_port);

        for my $table_name (sort keys %$info)
        {
                for my $item (@{$$info{$table_name}{foreign_keys} })
                {
                        $pk_table_name  = $$item{$temp_1};
                        $fk_table_name  = $$item{$temp_2};
                        $fk_column_name = $$item{$temp_3};

                        if ($pk_table_name)
                        {
                                $singular_name = to_singular($pk_table_name);

                                if ($special_fk_column{$fk_column_name})
                                {
                                        $primary_key_name = $special_fk_column{$fk_column_name};
                                }
                                elsif (defined($$info{$table_name}{columns}{$fk_column_name}) )
                                {
                                        $primary_key_name = $fk_column_name;
                                }
                                elsif (defined($$info{$table_name}{columns}{id}) )
                                {
                                        $primary_key_name = 'id';
                                }
                                else
                                {
                                        die "Primary table '$pk_table_name'. Foreign table '$fk_table_name'. Unable to find primary key name for foreign key '$fk_column_name'\n"
                                }

                                $foreign_key{$fk_table_name}                               = {} if (! $foreign_key{$fk_table_name});
                                $foreign_key{$fk_table_name}{$fk_column_name}              = {} if (! $foreign_key{$fk_table_name}{$fk_column_name});
                                $primary_key_name                                          =~ s/${singular_name}_//;
                                $foreign_key{$fk_table_name}{$fk_column_name}{$table_name} = $primary_key_name;
                        }
                }
        }

        my(@header) =
        (
                'Name',
                'Type',
                'Null',
                'Key',
                'Auto-increment',
        );

        my($table) = Text::Table::Manifold -> new
        (
                alignment =>
                [
                        align_left,
                        align_left,
                        align_left,
                        align_left,
                        align_left,
                ],
                format => format_text_unicodebox_table,
                headers => \@header,
                join   => "\n",
        );
        my(%type) =
        (
                'character varying' => 'varchar',
                'int(11)'           => 'integer',
                '"timestamp"'       => 'timestamp',
        );

        my($auto_increment);
        my(@data);
        my($index);
        my($nullable);
        my($primary_key);
        my($type);

        for my $table_name (sort keys %$info)
        {
                print "Table: $table_name.\n\n";

                @data  = ();
                $index = undef;

                for my $column_name (keys %{$$info{$table_name}{columns} })
                {
                        $type           = $$info{$table_name}{columns}{$column_name}{TYPE_NAME};
                        $type           = $type{$type} ? $type{$type} : $type;
                        $nullable       = $$info{$table_name}{columns}{$column_name}{IS_NULLABLE} eq 'NO';
                        $primary_key    = $$info{$table_name}{primary_keys}{$column_name};
                        $auto_increment = $primary_key; # Database server-independent kludge :-(.

                        push @data,
                        [
                                $column_name,
                                $type,
                                $nullable       ? 'not null'       : '',
                                $primary_key    ? 'primary key'    : '',
                                $auto_increment ? 'auto_increment' : '',
                        ];

                        $index = pop @data if ($column_name eq 'id');
                }

                @data = sort{$$a[0] cmp $$b[0]} @data;

                unshift @data, $index if ($index);

                $table -> data(\@data);

                print $table -> render_as_string, "\n\n";
        }

If the environment vaiables DBI_DSN, DBI_USER and DBI_PASS are set (the latter 2 are optional [e.g. for SQLite), then this demonstrates extracting a lot of information from a database schema.

Also, for Postgres, you can set DBI_SCHEMA to a list of schemas, e.g. when processing the MusicBrainz database.

For details, see <http://blogs.perl.org/users/ron_savage/2013/03/graphviz2-and-the-dread-musicbrainz-db.html>.

See also xt/author/fk.t, xt/author/mysql.fk.pl and xt/author/person.spouse.t.

"DBIx::Admin::TableInfo" is a pure Perl module.

It is a convenient wrapper around all of these DBI methods:

o table_info()
o column_info()
o primary_key_info()
o foreign_key_info()
o MySQL
Warning:

To get foreign key information in the output, the create table statement has to:

o Include an index clause
o Include a foreign key clause
o Include an engine clause
As an example, a column definition for Postgres and SQLite, which looks like:

        site_id integer not null references sites(id),
    

has to, for MySql, look like:

        site_id integer not null, index (site_id), foreign key (site_id) references sites(id),
    

Further, the create table statement, which for Postgres and SQLite looks like:

        create table designs (...)
    

has to, for MySql, look like:

        create table designs (...) engine=innodb
    
o Oracle
See the "FAQ" for which tables are ignored under Oracle.
o Postgres
The latter now takes '%' as the value of the 'table' parameter to new(), whereas older versions of DBD::Pg required 'table' to be set to 'table'.

See the "FAQ" for which tables are ignored under Postgres.

o SQLite
See the "FAQ" for which tables are ignored under SQLite.

This module is available both as a Unix-style distro (*.tgz) and an ActiveState-style distro (*.ppd). The latter is shipped in a *.zip file.

See http://savage.net.au/Perl-modules.html for details.

See http://savage.net.au/Perl-modules/html/installing-a-module.html for help on unpacking and installing each type of distro.

new(...) returns a "DBIx::Admin::TableInfo" object.

This is the class contructor.

Usage: DBIx::Admin::TableInfo -> new().

This method takes a set of parameters. Only the dbh parameter is mandatory.

For each parameter you wish to use, call new as new(param_1 => value_1, ...).

o catalog
This is the value passed in as the catalog parameter to table_info() and column_info().

The default value is undef.

undef was chosen because it given the best results with MySQL.

Note: The MySQL driver DBD::mysql V 2.9002 has a bug in it, in that it aborts if an empty string is used here, even though the DBI docs say an empty string can be used for the catalog parameter to "table_info()".

This parameter is optional.

o dbh
This is a database handle.

This parameter is mandatory.

o schema
This is the value passed in as the schema parameter to table_info() and column_info().

The default value is undef.

Note: If you are using Oracle, call "new()" with schema set to uc $user_name.

Note: If you are using Postgres, call "new()" with schema set to 'public'.

Note: If you are using SQLite, call "new()" with schema set to 'main'.

This parameter is optional.

o table
This is the value passed in as the table parameter to table_info().

The default value is '%'.

Note: If you are using an 'old' version of DBD::Pg, call "new()" with table set to 'table'.

Sorry - I cannot tell you exactly what 'old' means. As stated above, the default value (%) works fine with DBD::Pg V 2.17.1.

This parameter is optional.

o type
This is the value passed in as the type parameter to table_info().

The default value is 'TABLE'.

This parameter is optional.

Returns an array ref of column names.

By default they are sorted by name.

However, if you pass in a true value for $by_position, they are sorted by the column attribute ORDINAL_POSITION. This is Postgres-specific.

Warning: This is a function, not a method. It is called like this:

        my($schema) = DBIx::Admin::TableInfo::dbh2schema($dbh);

The code is just:

        my($dbh)    = @_;
        my($vendor) = uc $dbh -> get_info(17); # SQL_DBMS_NAME.
        my(%schema) =
        (
                MYSQL      => undef,
                ORACLE     => uc $$dbh{Username},
                POSTGRESQL => 'public',
                SQLITE     => 'main',
        );

        return $schema{$vendor};

Returns a hash ref of all available data.

The structure of this hash is described next:

o First level: The keys are the names of the tables
        my($info)       = $obj -> info();
        my(@table_name) = sort keys %$info;
    

I use singular names for my arrays, hence @table_name rather than @table_names.

o Second level: The keys are 'attributes', 'columns', 'foreign_keys' and 'primary_keys'
        my($table_attributes) = $$info{$table_name}{attributes};
    

This is a hash ref of the attributes of the table. The keys of this hash ref are determined by the database server.

        my($columns) = $$info{$table_name}{columns};
    

This is a hash ref of the columns of the table. The keys of this hash ref are the names of the columns.

        my($foreign_keys) = $$info{$table_name}{foreign_keys};
    

This is a hash ref of the foreign keys of the table. The keys of this hash ref are the names of the tables which contain foreign keys pointing to $table_name.

For MySQL, $foreign_keys will be the empty hash ref {}, as explained above.

        my($primary_keys) = $$info{$table_name}{primary_keys};
    

This is a hash ref of the primary keys of the table. The keys of this hash ref are the names of the columns which make up the primary key of $table_name.

For any database server, if there is more than 1 column in the primary key, they will be numbered (ordered) according to the hash key 'KEY_SEQ'.

For MySQL, if there is more than 1 column in the primary key, they will be artificially numbered according to the order in which they are returned by "column_info()", as explained above.

o Third level, after 'attributes': Table attributes
        my($table_attributes) = $$info{$table_name}{attributes};

        while ( ($name, $value) = each(%$table_attributes) )
        {
                Use...
        }
    

For the attributes of the tables, there are no more levels in the hash ref.

o Third level, after 'columns': The keys are the names of the columns.
        my($columns) = $$info{$table_name}{columns};

        my(@column_name) = sort keys %$columns;
    
o Fourth level: Column attributes
        for $column_name (@column_name)
        {
            while ( ($name, $value) = each(%{$columns{$column_name} }) )
            {
                    Use...
            }
        }
    
o Third level, after 'foreign_keys': An arrayref contains the details (if any)
But beware slightly differing spellings depending on the database server. This is documented in <https://metacpan.org/pod/DBI#foreign_key_info>. Look closely at the usage of the '_' character.

        my($vendor) = uc $dbh -> get_info(17); # SQL_DBMS_NAME.

        for $item (@{$$info{$table_name}{foreign_keys} })
        {
                # Get the name of the table pointed to.

                $primary_table = ($vendor eq 'MYSQL') ? $$item{PKTABLE_NAME} : $$item{UK_TABLE_NAME};
        }
    
o Third level, after 'primary_keys': The keys are the names of columns
These columns make up the primary key of the current table.

        my($primary_keys) = $$info{$table_name}{primary_keys};

        for $primary_key (sort{$$a{KEY_SEQ} <=> $$b{KEY_SEQ} } keys %$primary_keys)
        {
                $primary = $$primary_keys{$primary_key};

                for $attribute (sort keys %$primary)
                {
                        Use...
                }
        }
    

Returns the same hash ref as info().

Use this after changing the database schema, when you want this module to re-interrogate the database server.

Returns an array ref of table names.

They are sorted by name.

See the "FAQ" for which tables are ignored under which databases.

Here are tested parameter values for various database vendors:
o MS Access
        my($admin) = DBIx::Admin::TableInfo -> new(dbh => $dbh);

        In other words, the default values for catalog, schema, table and type will Just Work.
    
o MySQL
        my($admin) = DBIx::Admin::TableInfo -> new(dbh => $dbh);

        In other words, the default values for catalog, schema, table and type will Just Work.
    
o Oracle
        my($dbh)   = DBI -> connect($dsn, $username, $password);
        my($admin) = DBIx::Admin::TableInfo -> new
        (
                dbh    => $dbh,
                schema => uc $username, # Yep, upper case.
        );

        See the FAQ for which tables are ignored under Oracle.
    
o PostgreSQL
        my($admin) = DBIx::Admin::TableInfo -> new
        (
                dbh    => $dbh,
                schema => 'public',
        );

        For PostgreSQL, you probably want to ignore table names matching /^(pg_|sql_)/.

        As stated above, for 'old' versions of DBD::Pg, use:

        my($admin) = DBIx::Admin::TableInfo -> new
        (
                dbh    => $dbh,
                schema => 'public',
                table  => 'table', # Yep, lower case.
        );

        See the FAQ for which tables are ignored under Postgres.
    
o SQLite
        my($admin) = DBIx::Admin::TableInfo -> new
        (
                dbh    => $dbh,
                schema => 'main',
        );

        In other words, the default values for catalog, table and type will Just Work.

        See the FAQ for which tables are ignored under SQLite.
    

See the examples/ directory in the distro.

        Versions as at 2014-08-06:
        +----------|-------------+
        |  Vendor  |      V      |
        +----------|-------------+
        |  MariaDB |   5.5.38    |
        +----------|-------------+
        |  Oracle  | 10.2.0.1.0  | (Not tested for years)
        +----------|-------------+
        | Postgres |    9.1.3    |
        +----------|-------------+
        |  SQLite  |   3.8.4.1   |
        +----------|-------------+

But see these warnings <https://metacpan.org/pod/DBIx::Admin::TableInfo#Description> when using MySQL/MariaDB.

Here is the code which skips some tables:

        next if ( ($vendor eq 'ORACLE')     && ($table_name =~ /^BIN\$.+\$./) );
        next if ( ($vendor eq 'POSTGRESQL') && ($table_name =~ /^(?:pg_|sql_)/) );
        next if ( ($vendor eq 'SQLITE')     && ($table_name eq 'sqlite_sequence') );

o See scripts/foreign.keys.pl
First set the environment variables DBI_DSN, DBI_USER and DBI_PASS.

Then, it writes in CSV format to STDOUT, which you can redirect to, say, foreign.keys.csv.

o Take a very simplistic and brute-force approach
Note: The table names here come from xt/author/person.spouse.t.

See "FAQ" in DBIx::Admin::CreateTable for database server-specific create statements to activate foreign keys.

First set the environment variables DBI_DSN, DBI_USER and DBI_PASS.

Then try:

        my($info) = DBIx::Admin::TableInfo -> new(dbh => $dbh) -> info;

        print Data::Dumper::Concise::Dumper($$info{people}{foreign_keys}), "\n";
    

Sample output follows below.

Beware: Slightly differing spellings depending on the database server. This is documented in <https://metacpan.org/pod/DBI#foreign_key_info>. Look closely at the presence or absence of the '_' character.

o MySQL
        [
          {
            DEFERABILITY => undef,
            DELETE_RULE => undef,
            FKCOLUMN_NAME => "spouse_id",
            FKTABLE_CAT => "def",
            FKTABLE_NAME => "spouses",
            FKTABLE_SCHEM => "testdb",
            FK_NAME => "spouses_ibfk_2",
            KEY_SEQ => 1,
            PKCOLUMN_NAME => "id",
            PKTABLE_CAT => undef,
            PKTABLE_NAME => "people",
            PKTABLE_SCHEM => "testdb",
            PK_NAME => undef,
            UNIQUE_OR_PRIMARY => undef,
            UPDATE_RULE => undef
          }
        ]
    

Yes, there is just 1 element in this arrayref. MySQL can sliently drop an index if another index can be used.

o Postgres
        [
          {
            DEFERABILITY => 7,
            DELETE_RULE => 3,
            FK_COLUMN_NAME => "person_id",
            FK_DATA_TYPE => "int4",
            FK_NAME => "spouses_person_id_fkey",
            FK_TABLE_CAT => undef,
            FK_TABLE_NAME => "spouses",
            FK_TABLE_SCHEM => "public",
            ORDINAL_POSITION => 1,
            UK_COLUMN_NAME => "id",
            UK_DATA_TYPE => "int4",
            UK_NAME => "people_pkey",
            UK_TABLE_CAT => undef,
            UK_TABLE_NAME => "people",
            UK_TABLE_SCHEM => "public",
            UNIQUE_OR_PRIMARY => "PRIMARY",
            UPDATE_RULE => 3
          },
          {
            DEFERABILITY => 7,
            DELETE_RULE => 3,
            FK_COLUMN_NAME => "spouse_id",
            FK_DATA_TYPE => "int4",
            FK_NAME => "spouses_spouse_id_fkey",
            FK_TABLE_CAT => undef,
            FK_TABLE_NAME => "spouses",
            FK_TABLE_SCHEM => "public",
            ORDINAL_POSITION => 1,
            UK_COLUMN_NAME => "id",
            UK_DATA_TYPE => "int4",
            UK_NAME => "people_pkey",
            UK_TABLE_CAT => undef,
            UK_TABLE_NAME => "people",
            UK_TABLE_SCHEM => "public",
            UNIQUE_OR_PRIMARY => "PRIMARY",
            UPDATE_RULE => 3
          }
        ]
    
o SQLite
        [
          {
            DEFERABILITY => undef,
            DELETE_RULE => 3,
            FK_COLUMN_NAME => "spouse_id",
            FK_DATA_TYPE => undef,
            FK_NAME => undef,
            FK_TABLE_CAT => undef,
            FK_TABLE_NAME => "spouses",
            FK_TABLE_SCHEM => undef,
            ORDINAL_POSITION => 0,
            UK_COLUMN_NAME => "id",
            UK_DATA_TYPE => undef,
            UK_NAME => undef,
            UK_TABLE_CAT => undef,
            UK_TABLE_NAME => "people",
            UK_TABLE_SCHEM => undef,
            UNIQUE_OR_PRIMARY => undef,
            UPDATE_RULE => 3
          },
          {
            DEFERABILITY => undef,
            DELETE_RULE => 3,
            FK_COLUMN_NAME => "person_id",
            FK_DATA_TYPE => undef,
            FK_NAME => undef,
            FK_TABLE_CAT => undef,
            FK_TABLE_NAME => "spouses",
            FK_TABLE_SCHEM => undef,
            ORDINAL_POSITION => 0,
            UK_COLUMN_NAME => "id",
            UK_DATA_TYPE => undef,
            UK_NAME => undef,
            UK_TABLE_CAT => undef,
            UK_TABLE_NAME => "people",
            UK_TABLE_SCHEM => undef,
            UNIQUE_OR_PRIMARY => undef,
            UPDATE_RULE => 3
          }
        ]
    

You can also play with xt/author/fk.t and xt/author/dsn.ini (especially the 'active' option).

fk.t does not delete the tables as it exits. This is so xt/author/mysql.fk.pl has something to play with.

See also xt/author/person.spouse.t.

Yes. As of V 2.08, this module uses the SQLite code "pragma foreign_key_list($table_name)" to emulate the DBI call to foreign_key_info(...).

An arrayref is returned. Indexes and their interpretations:

        0: COUNT   (0, 1, ...)
        1: KEY_SEQ (0, or column # (1, 2, ...) within multi-column key)
        2: PK_TABLE_NAME
        3: FK_COLUMN_NAME
        4: PK_COLUMN_NAME
        5: UPDATE_RULE
        6: DELETE_RULE
        7: 'NONE' (Constant string)

As these are stored in an arrayref, I use $$row[$i] just below to refer to the elements of the array.

See also the next point.

        my(%referential_action) =
        (
                'CASCADE'     => 0,
                'RESTRICT'    => 1,
                'SET NULL'    => 2,
                'NO ACTION'   => 3,
                'SET DEFAULT' => 4,
        );

The hashref returned for foreign keys contains these key-value pairs:

        {
                DEFERABILITY      => undef,
                DELETE_RULE       => $referential_action{$$row[6]},
                FK_COLUMN_NAME    => $$row[3],
                FK_DATA_TYPE      => undef,
                FK_NAME           => undef,
                FK_TABLE_CAT      => undef,
                FK_TABLE_NAME     => $table_name,
                FK_TABLE_SCHEM    => undef,
                ORDINAL_POSITION  => $$row[1],
                UK_COLUMN_NAME    => $$row[4],
                UK_DATA_TYPE      => undef,
                UK_NAME           => undef,
                UK_TABLE_CAT      => undef,
                UK_TABLE_NAME     => $$row[2],
                UK_TABLE_SCHEM    => undef,
                UNIQUE_OR_PRIMARY => undef,
                UPDATE_RULE       => $referential_action{$$row[5]},
        }

This list of keys matches what is returned when processing a Postgres database.

I certainly hope not. To me the FK_TABLE_NAME points to the UK_TABLE_NAME.

The "pragma foreign_key_list($table_name)" call for SQLite returns data from the create statement, and thus it reports what the given table points to. The DBI call to foreign_key_info(...) returns data about foreign keys referencing (pointing to) the given table. This can be confusing.

Here is a method from the module App::Office::Contacts::Util::Create, part of App::Office::Contacts.

        sub create_organizations_table
        {
                my($self)        = @_;
                my($table_name)  = 'organizations';
                my($primary_key) = $self -> creator -> generate_primary_key_sql($table_name);
                my($engine)      = $self -> engine;
                my($result)      = $self -> creator -> create_table(<<SQL);
create table $table_name
(
        id $primary_key,
        visibility_id integer not null references visibilities(id),
        communication_type_id integer not null references communication_types(id),
        creator_id integer not null,
        role_id integer not null references roles(id),
        deleted integer not null,
        facebook_tag varchar(255) not null,
        homepage varchar(255) not null,
        name varchar(255) not null,
        timestamp timestamp not null default localtimestamp,
        twitter_tag varchar(255) not null,
        upper_name varchar(255) not null
) $engine
SQL

                $self -> dbh -> do("create index ${table_name}_upper_name on $table_name (upper_name)");

                $self -> report($table_name, 'created', $result);

        }       # End of create_organizations_table.

Consider this line:

        visibility_id integer not null references visibilities(id),

That means, for the 'visibilities' table, the info() method in the current module will return a hashref like:

        {
                visibilities =>
                {
                        ...
                        foreign_keys =>
                        {
                                ...
                                organizations =>
                                {
                                        UK_COLUMN_NAME    => 'id',
                                        DEFERABILITY      => undef,
                                        ORDINAL_POSITION  => 0,
                                        FK_TABLE_CAT      => undef,
                                        UK_NAME           => undef,
                                        UK_DATA_TYPE      => undef,
                                        UNIQUE_OR_PRIMARY => undef,
                                        UK_TABLE_SCHEM    => undef,
                                        UK_TABLE_CAT      => undef,
                                        FK_COLUMN_NAME    => 'visibility_id',
                                        FK_TABLE_NAME     => 'organizations',
                                        FK_TABLE_SCHEM    => undef,
                                        FK_DATA_TYPE      => undef,
                                        UK_TABLE_NAME     => 'visibilities',
                                        DELETE_RULE       => 3,
                                        FK_NAME           => undef,
                                        UPDATE_RULE       => 3
                                },
                        },
        }

This is saying that for the table 'visibilities', there is a foreign key in the 'organizations' table. That foreign key is called 'visibility_id', and it points to the key called 'id' in the 'visibilities' table.

You may need to do something like this:

        $dbh -> do("set search_path to $ENV{DBI_SCHEMA}") if ($ENV{DBI_SCHEMA});

$ENV{DBI_SCHEMA} can be a comma-separated list, as in:

        $dbh -> do("set search_path to my_schema, public");

See DBD::Pg for details.

DBIx::Admin::CreateTable.

DBIx::Admin::DSNManager.

Version numbers < 1.00 represent development versions. From 1.00 up, they are production versions.

<https://github.com/ronsavage/DBIx-Admin-TableInfo>

Bugs should be reported via the CPAN bug tracker at

<https://github.com/ronsavage/DBIx-Admin-TableInfo/issues>

"DBIx::Admin::TableInfo" was written by Ron Savage <ron@savage.net.au> in 2004.

Home page: http://savage.net.au/index.html

Australian copyright (c) 2004, Ron Savage.

        All Programs of mine are 'OSI Certified Open Source Software';
        you can redistribute them and/or modify them under the terms of
        The Perl License, a copy of which is available at:
        http://www.opensource.org/licenses/index.html
2021-02-04 perl v5.32.1

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