NAME

OpenInteract2::Datasource::DBI - Create DBI database handles

SYNOPSIS

# Define the parameters for a database handle 'main' using PostgreSQL

[datasource main]
type          = DBI
dbi_type      = Pg
dsn           = dbname=urkelweb
username      = webuser
password      = urkelnut

# Define a handle 'win32' that uses Microsoft SQL Server and connects
# with ODBC

[datasource win32]
type          = DBI
dbi_type      = MSSQL
use_odbc      = yes
dsn           = MyDSN
username      = webuser
password      = urkelnut

# Request the datasource 'main' from the context object (which in
# turn requests it from the OpenInteract2::DatasourceManager object,
# which in turn requests it from this class)

my $dbh = CTX->datasource( 'main' );
my $sth = $dbh->prepare( "SELECT * FROM urkel_fan" );
$sth->execute;
...

DESCRIPTION

No, we do not subclass DBI with this. No, we do not override any of the DBI methods. Instead, we provide the means to connect to the database from one location using nothing more than a datasource name. This is somewhat how the Java Naming and Directory Interface (JNDI) allows you to manage objects, including database connections.

Note that if you are using it this should work flawlessly (although pointlessly) with Apache::DBI, and if you are using this on a different persistent Perl platform (say, PerlEx) then this module gives you a single location from which to retrieve database handles -- this makes using the BEGIN/END tricks ActiveState recommends in their FAQ pretty trivial.

METHODS

connect( $datasource_name, \%datasource_info )

Returns: A DBI database handle with the following parameters set:

RaiseError:  1
PrintError:  0
ChopBlanks:  1
AutoCommit:  1 (for now...)
LongReadLen: 32768 (or from 'long_read_len' of \%datasource_info)
LongTruncOk: 0     (or from 'long_trunc_ok' of \%datasource_info)

The parameter \%datasource_info defines how we connect to the database and is pulled from your 'datasource.$name' server configuration.

• dsn ($)

  The last part of a fully-formed DBI data source name used to connect to this database. Examples:

  Full DBI DSN:     DBI:mysql:webdb
  OpenInteract DSN: webdb
  
  Full DBI DSN:     DBI:Pg:dbname=web
  OpenInteract DSN: dbname=web
  
  Full DBI DSN:     DBI:Sybase:server=SYBASE;database=web
  OpenInteract DSN: server=SYBASE;database=web
  
  Full DBI DSN:     DBI:ODBC:MyDSN
  OpenInteract DSN: MyDSN

  So the OpenInteract DSN string only includes the database-specific items for DBI, the third entry in the colon-separated string. This third item is generally separated by semicolons and usually specifies a database name, hostname, packet size, protocol version, etc. See your DBD driver for what to do.

• dbi_type ($)

  What database type are you using? Available values are: 'MySQL', 'Pg', 'Sybase', 'ASAny', 'Oracle', 'SQLite' and 'MSSQL'.

• username ($)

  What username should we use to login to this database?

• password ($)

  What password should we use in combination with the username to login to this database?

• use_odbc (yes/no; default no)

  Whether to use ODBC as a DBI driver.

• long_read_len ($) (optional)

  Set the LongReadLen value for the database handle (See DBI for information on what this means.) If not set this defaults to 32768.

• long_trunc_ok (bool) (optional)

  Set the LongTruncOk value for the database handle (See DBI for information on what this means.) If not set this defaults to false.

• trace_level ($) (optional)

  Use the DBI trace() method to output logging information for all calls on a database handle. Default is '0', which is no tracing. As documented by DBI, the levels are:

  0 - Trace disabled.
  1 - Trace DBI method calls returning with results or errors.
  2 - Trace method entry with parameters and returning with results.
  3 - As above, adding some high-level information from the driver
      and some internal information from the DBI.
  4 - As above, adding more detailed information from the driver.
      Also includes DBI mutex information when using threaded Perl.
  5 and above - As above but with more and more obscure information.

Any errors encountered will throw an exception, usually of the OpenInteract2::Exception::Datasource variety.

resolve_datasource_info( $name, \%datasource_info )

Internal method used to resolve some shortcuts we allow for usability. This will look at the 'dbi_type' and add keys to the datasource information:

spops

Lists the SPOPS class to use.

driver_name

Lists the DBI driver name to use -- this is what you'd use in the second ':' place in the DBI connect() call.

Returns a new hashref of information. For backwards compatibility, if we see the key spops in \%datasource_info we just return a new hashref with the same data.

SEE ALSO

OpenInteract2::Exception::Datasource

Apache::DBI

DBI - http://www.symbolstone.org/technology/perl/DBI

PerlEx - http://www.activestate.com/Products/PerlEx/

COPYRIGHT

Copyright (c) 2002-2005 Chris Winters. All rights reserved.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHORS

Chris Winters <chris@cwinters.com>