Provided by: liburi-db-perl_0.20-2_all 
Name
URI::db - Database URIs
Synopsis
use URI;
my $db_uri = URI->new('db:pg://user@localhost');
my $pg_uri = URI->new('postgres://example.com/template1');
my $sl_uri = URI->new('sqlite:/var/db/widgets.db');
Description
This class provides support for database URIs. They're inspired by JDBC URIs
<http://docs.oracle.com/cd/B14117_01/java.101/b10979/urls.htm#BEIJFHHB> and PostgreSQL
URIs <http://www.postgresql.org/docs/9.3/static/libpq-connect.html#LIBPQ-CONNSTRING>,
though they're a bit more formal. The specification for their format is documented in
README.md <https:/github.com/theory/db-uri/>.
Warning: This is an alpha release. I will do my best to preserve functionality going
forward, especially as Sqitch uses this module. However, as the database URI specification
moves forward, changes may require backwards-incompatible changes. Caveat Hackor.
Format
A database URI is made up of these parts:
db:engine:[//[user[:password]@][host][:port]/][dbname][?params][#fragment]
"db"
The literal string "db" is the scheme that defines a database URI. Optional for well-
known engines.
"engine"
A string identifying the database engine.
"user"
The user name to use when connecting to the database.
"password"
The password to use when connecting to the database.
"host"
The host address to connect to.
"port"
The network port to connect to.
"dbname"
The name of the database. For some engines, this will be a file name, in which case it
may be a complete or local path, as appropriate.
"params"
A URI-standard GET query string representing additional parameters to be passed to the
engine.
"fragment"
Identifies a database part, such as a table or view.
Examples
Some examples:
• "db:sqlite"
• "db:sqlite:dbname"
• "db:sqlite:/path/to/some.db"
• "sqlite:../relative.db"
• "db:firebird://localhost/%2Fpath/to/some.db"
• "db:firebird://localhost//path/to/some.db"
• "firebird://localhost/relative.db"
• "db:pg://"
• "db:pg://localhost"
• "db:pg://localhost:5433"
• "db:pg://localhost/mydb"
• "db:pg://user@localhost"
• "db:pg://user:secret@/mydb"
• "pg:///mydb"
• "pg://other@localhost/otherdb?connect_timeout=10&application_name=myapp"
• "db://localhost/mydb"
• "db:unknown://example.com/mydb"
Interface
The following differences exist compared to the "URI" class interface:
Class Method
"default_port"
Returns the default port for the engine. This is a class method value defined by each
recognized URI engine.
Constructors
"new"
my $uri = URI::db->new($string);
my $uri = URI::db->new($string, $base);
Always returns a URI::db object. $base may be another URI object or string. Unlike in
URI's "new()", the scheme will always be applied to the URI if it does not already have
one.
Accessors
"scheme"
my $scheme = $uri->scheme;
$uri->scheme( $new_scheme );
Gets or sets the scheme part of the URI. For "db:" URIs, the scheme cannot be changed to
any value other than "db" (or any case variation thereof). For non-"db:" URIs, the scheme
may be changed to any value, though the URI object may no longer be a database URI.
"engine"
my $engine = $uri->engine;
$uri->engine( $new_engine );
Gets or sets the engine part of the URI, which may be any valid URI scheme value, though
recognized engines provide additional context, such as the "default_port()" and a driver-
specific "dbi_dsn()".
If called with an argument, it updates the engine, possibly changing the class of the URI,
and returns the old engine value.
"canonical_engine"
my $canonical_engine = $uri->canonical_engine;
Returns the canonical engine. A number of engine names are aliases for other engines. This
method will return the non-aliased engine name. For example, the "postgres" engine will
return the canonical engine "pg", the "sqlite3" returns the canonical engine "sqlite", and
"maria" returns the canonical engine "mysql".
"dbname"
my $dbname = $uri->dbname;
$uri->dbname( $new_dbname );
Gets or sets the name of the database. If called with an argument, the path will also be
updated.
"host"
my $host = $uri->host;
$uri->host( $new_host );
Gets or sets the host to connect to.
"port"
my $port = $uri->port;
$uri->port( $new_port );
Gets or sets the port to connect to.
"user"
my $user = $uri->user;
$uri->user( $new_user );
Gets or sets the user name.
"password"
my $password = $uri->password;
$uri->password( $new_password );
Gets or sets the password.
"uri"
Returns the underlying engine URI. For URIs starting with "db:", this will be the URI that
follows. For database URIs without "db:", the URI itself will be returned.
Instance Methods
"has_recognized_engine"
my $has_recognized_engine = $uri->has_recognized_engine;
Returns true if the engine is recognized by URI::db, and false if it is not. A recognized
engine is simply one that inherits from "URI::_db".
"query_params"
my @params = $uri->query_params;
Returns a list of key/value pairs representing all query parameters. Parameters specified
more than once will be returned more than once, so avoid assigning to a hash. If you want
a hash, use URI::QueryParam's "query_from_hash()", where duplicate keys lead to an array
of values for that key:
use URI::QueryParam;
my $params = $uri->query_form_hash;
"dbi_driver"
if ( my $driver = $uri->dbi_driver ) {
eval "require DBD::$driver" or die;
}
Returns a string representing the DBI driver name for the database engine, if one is
known. Returns "undef" if no driver is known.
"dbi_dsn"
DBI->connect( $uri->dbi_dsn, $uri->user, $uri->password );
Returns a DBI DSN appropriate for use in a call to "DBI->connect". The attributes will
usually be pulled from the URI host name, port, and database name, as well as the query
parameters. If no driver is known for the URI, the "dbi:$driver:" part of the DSN will be
omitted, in which case you can use the $DBI_DRIVER environment variable to identify an
appropriate driver. If the URI supports multiple drivers, pass the name of the one you
want to "dbi_dsn()". Currently only URI::myssql supports alternate drivers, ADO, ODBC, or
Sybase. Otherwise, each database URI does its best to create a valid DBI DSN. Some
examples:
| URI | DSN |
|--------------------------------------+--------------------------------------------------|
| db:pg:try | dbi:Pg:dbname=try |
| db:mysql://localhost:33/foo | dbi:mysql:host=localhost;port=33;database=foo |
| db:db2://localhost:33/foo | dbi:DB2:HOSTNAME=localhost;PORT=33;DATABASE=foo |
| db:vertica:dbadmin | dbi:ODBC:DSN=dbadmin |
| db:mssql://foo.com/pubs?Driver=MSSQL | dbi:ODBC:Host=foo.com;Database=pubs;Driver=MSSQL |
"dbi_params"
my @params = $uri->dbi_params;
Returns a list of key/value pairs used as parameters in the DBI DSN, including query
parameters. Parameters specified more than once will be returned more than once, so avoid
assigning to a hash.
"abs"
my $abs = $uri->abs( $base_uri );
For "db:" URIs, simply returns the URI::db object itself. For Non-"db:" URIs, the behavior
is the same as for URI including respect for $URI::ABS_ALLOW_RELATIVE_SCHEME.
"rel"
my $rel = $uri->rel( $base_uri );
For "db:" URIs, simply returns the URI::db object itself. For Non-"db:" URIs, the behavior
is the same as for URI.
"canonical"
my $canonical_uri = $uri->canonical;
Returns a normalized version of the URI. This behavior is the same for other URIs, except
that the engine will be replaced with the value of "canonical_engine" if it is not already
the canonical engine.
Support
This module is stored in an open GitHub repository <https://github.com/theory/uri-db/>.
Feel free to fork and contribute!
Please file bug reports via GitHub Issues <https://github.com/theory/uri-db/issues/> or by
sending mail to bug-URI-db@rt.cpan.org <mailto:bug-URI-db@rt.cpan.org>.
Author
David E. Wheeler <david@justatheory.com>
Copyright and License
Copyright (c) 2013-2016 David E. Wheeler. Some Rights Reserved.
This module is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.