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 = $database->schema();
38 use base qw(Class::Accessor);
40 use vars qw($database);
42 __PACKAGE__->mk_accessors(qw( ));
45 # Internal helper function (not a method!). This creates a new
46 # database connection from the data given in the current context, and
52 my $context = C4::Context->new();
54 my $db_driver = $context->{db_driver};
56 my $db_name = $context->config("database");
57 my $db_host = $context->config("hostname");
58 my $db_port = $context->config("port") || '';
59 my $db_user = $context->config("user");
60 my $db_passwd = $context->config("pass");
62 my ( %encoding_attr, $encoding_query, $tz_query );
64 if ( $db_driver eq 'mysql' ) {
65 %encoding_attr = ( mysql_enable_utf8 => 1 );
66 $encoding_query = "set NAMES 'utf8'";
67 $tz_query = qq(SET time_zone = "$tz") if $tz;
69 elsif ( $db_driver eq 'Pg' ) {
70 $encoding_query = "set client_encoding = 'UTF8';";
71 $tz_query = qq(SET TIME ZONE = "$tz") if $tz;
73 my $schema = Koha::Schema->connect(
75 dsn => "dbi:$db_driver:database=$db_name;host=$db_host;port=$db_port",
77 password => $db_passwd,
79 RaiseError => $ENV{DEBUG} ? 1 : 0,
82 $encoding_query || (),
88 my $dbh = $schema->storage->dbh;
90 $dbh->{RaiseError} = 1;
92 SELECT * FROM systempreferences WHERE 1 = 0 |
94 $dbh->{RaiseError} = $ENV{DEBUG} ? 1 : 0;
96 $dbh->{RaiseError} = 0 if $@;
103 $schema = $database->schema;
105 Returns a database handle connected to the Koha database for the
106 current context. If no connection has yet been made, this method
107 creates one, and connects to the database.
109 This database handle is cached for future use: if you call
110 C<$database-E<gt>schema> twice, you will get the same handle both
111 times. If you need a second database handle, use C<&new_schema> and
112 possibly C<&set_schema>.
120 unless ( $params->{new} ) {
121 return $database->{schema} if defined $database->{schema};
124 $database->{schema} = &_new_schema();
125 return $database->{schema};
130 $schema = $database->new_schema;
132 Creates a new connection to the Koha database for the current context,
133 and returns the database handle (a C<DBI::db> object).
135 The handle is not saved anywhere: this method is strictly a
136 convenience function; the point is that it knows which database to
137 connect to so that the caller doesn't have to know.
145 return &_new_schema();
150 $my_schema = $database->new_schema;
151 $database->set_schema($my_schema);
153 $database->restore_schema;
155 C<&set_schema> and C<&restore_schema> work in a manner analogous to
156 C<&set_context> and C<&restore_context>.
158 C<&set_schema> saves the current database handle on a stack, then sets
159 the current database handle to C<$my_schema>.
161 C<$my_schema> is assumed to be a good database handle.
167 my $new_schema = shift;
169 # Save the current database handle on the handle stack.
170 # We assume that $new_schema is all good: if the caller wants to
171 # screw himself by passing an invalid handle, that's fine by
173 push @{ $database->{schema_stack} }, $database->{schema};
174 $database->{schema} = $new_schema;
177 =head2 restore_schema
179 $database->restore_schema;
181 Restores the database handle saved by an earlier call to
182 C<$database-E<gt>set_schema>.
189 if ( $#{ $database->{schema_stack} } < 0 ) {
192 die "SCHEMA stack underflow";
195 # Pop the old database handle and set it.
196 $database->{schema} = pop @{ $database->{schema_stack} };
198 # FIXME - If it is determined that restore_context should
199 # return something, then this function should, too.
209 Chris Cormack, E<lt>chrisc@catalyst.net.nzE<gt>