1 package Koha
::Database
;
3 # Copyright 2013 Catalyst IT
4 # chrisc@catalyst.net.nz
6 # This file is part of Koha.
8 # Koha is free software; you can redistribute it and/or modify it under the
9 # terms of the GNU General Public License as published by the Free Software
10 # Foundation; either version 3 of the License, or (at your option) any later
13 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
14 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
15 # A PARTICULAR PURPOSE. See the GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License along
18 # with Koha; if not, write to the Free Software Foundation, Inc.,
19 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
28 my $database = Koha::Database->new();
29 my $schema = $database->schema();
39 use base
qw(Class::Accessor);
41 __PACKAGE__
->mk_accessors(qw( ));
44 # Internal helper function (not a method!). This creates a new
45 # database connection from the data given in the current context, and
48 my $context = C4
::Context
->new();
49 my $db_driver = C4
::Context
::db_scheme2dbi
($context->config("db_scheme"));
51 my $db_name = $context->config("database");
52 my $db_host = $context->config("hostname");
53 my $db_port = $context->config("port") || '';
54 my $db_user = $context->config("user");
55 my $db_passwd = $context->config("pass");
57 my $db_opts = ($db_driver eq 'mysql') ?
{ mysql_enable_utf8
=> 1 } :
58 ($db_driver eq 'Pg') ?
{ pg_enable_utf8
=> 1 } :
60 my $schema = Koha
::Schema
->connect(
61 "DBI:$db_driver:dbname=$db_name;host=$db_host;port=$db_port",
62 $db_user, $db_passwd, $db_opts );
68 $schema = $database->schema;
70 Returns a database handle connected to the Koha database for the
71 current context. If no connection has yet been made, this method
72 creates one, and connects to the database.
74 This database handle is cached for future use: if you call
75 C<$database-E<gt>schema> twice, you will get the same handle both
76 times. If you need a second database handle, use C<&new_schema> and
77 possibly C<&set_schema>.
84 if ( defined( $self->{"schema"} ) && $self->{"schema"}->storage->connected() ) {
85 return $self->{"schema"};
88 # No database handle or it died . Create one.
89 $self->{"schema"} = &_new_schema
();
91 return $self->{"schema"};
96 $schema = $database->new_schema;
98 Creates a new connection to the Koha database for the current context,
99 and returns the database handle (a C<DBI::db> object).
101 The handle is not saved anywhere: this method is strictly a
102 convenience function; the point is that it knows which database to
103 connect to so that the caller doesn't have to know.
111 return &_new_schema
();
116 $my_schema = $database->new_schema;
117 $database->set_schema($my_schema);
119 $database->restore_schema;
121 C<&set_schema> and C<&restore_schema> work in a manner analogous to
122 C<&set_context> and C<&restore_context>.
124 C<&set_schema> saves the current database handle on a stack, then sets
125 the current database handle to C<$my_schema>.
127 C<$my_schema> is assumed to be a good database handle.
133 my $new_schema = shift;
135 # Save the current database handle on the handle stack.
136 # We assume that $new_schema is all good: if the caller wants to
137 # screw himself by passing an invalid handle, that's fine by
139 push @
{ $self->{"schema_stack"} }, $self->{"schema"};
140 $self->{"schema"} = $new_schema;
143 =head2 restore_schema
145 $database->restore_schema;
147 Restores the database handle saved by an earlier call to
148 C<$database-E<gt>set_schema>.
155 if ( $#{ $self->{"schema_stack"} } < 0 ) {
158 die "SCHEMA stack underflow";
161 # Pop the old database handle and set it.
162 $self->{"schema"} = pop @
{ $self->{"schema_stack"} };
164 # FIXME - If it is determined that restore_context should
165 # return something, then this function should, too.
175 Chris Cormack, E<lt>chrisc@catalyst.net.nzE<gt>