1ORLite::Mirror(3)     User Contributed Perl Documentation    ORLite::Mirror(3)
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NAME

6       ORLite::Mirror - Extend ORLite to support remote SQLite databases
7

SYNOPSIS

9         # Regular ORLite on a readonly SQLite database
10         use ORLite 'path/mydb.sqlite';
11
12         # The equivalent for a remote (optionally compressed) SQLite database
13         use ORLite::Mirror 'http://myserver/path/mydb.sqlite.gz';
14
15         # All available additional options specified
16         use ORLite::Mirror {
17             url           => 'http://myserver/path/mydb.sqlite.gz',
18             maxage        => 3600,
19             show_progress => 1,
20             env_proxy     => 1,
21             prune         => 1,
22             index         => [
23                 'table1.column1',
24                 'table1.column2',
25             ],
26         };
27

DESCRIPTION

29       ORLite provides a readonly ORM API when it loads a readonly SQLite
30       database from your local system.
31
32       By combining this capability with LWP, ORLite::Mirror goes one step
33       better and allows you to load a SQLite database from any arbitrary URI
34       in readonly form as well.
35
36       As demonstrated in the synopsis above, you using ORLite::Mirror in the
37       same way, but provide a URL instead of a file name.
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39       If the URL explicitly ends with a '.gz' or '.bz2' then ORLite::Mirror
40       will decompress the file before loading it.
41

OPTIONS

43       ORLite::Mirror adds an extensive set of options to those provided by
44       the underlying ORLite library.
45
46   url
47       The compulsory "url" parameter should be a string containing the remote
48       location of the SQLite database we will be mirroring.
49
50       ORLite::Mirror supports downloading the database compressed, and then
51       transparently decompressing the file locally. Compression support is
52       controlled by the extension on the remote database.
53
54       The extensions ".gz" (for gunzip) and ".bz2" (for bunzip2) are
55       currently supported.
56
57   maxage
58       The optional "maxage" parameter controls how often ORLite::Mirror
59       should check the remote server to see if the data has been updated.
60
61       This allows programs using the database to start quickly the majority
62       of the time, but continue to receive automatic updates periodically.
63
64       The value is the number of integer seconds we should avoid checking the
65       remote server for. The default is 86400 seconds (one 24 hour day).
66
67   show_progress
68       The optional "show_progress" parameter will be passed through to the
69       underlying LWP::UserAgent that will fetch the remote database file.
70
71       When set to true, it causes a progress bar to be displayed on the
72       terminal as the database file is downloaded.
73
74   env_proxy
75       The optional "env_proxy" parameter will be passed through to the
76       underlying LWP::UserAgent that will fetch the remote database file.
77
78       When set to true, it causes LWP::UserAgent to read the location of a
79       proxy server from the environment.
80
81   prune
82       The optional "prune" parameter should be used when the surrounding
83       program wants to avoid leaving files on the host system.
84
85       It causes any files or directories created during the operation of
86       ORLite::Mirror to be deleted on program exit at "END"-time.
87
88   index
89       One challenge when distributing SQLite database is the quantity of data
90       store on disk to support the indexes on your database.
91
92       For a moderately indexed database where all primary and foreign key
93       columns have indexes, the amount of data in the indexes can be nearly
94       as large as the data stored for the tables themselves.
95
96       Because each user of the database module will be interested in
97       different things, the indexes that the original creator chooses to
98       place on the database may not even be used at all and other valuable
99       indexes may not exist at all.
100
101       To allow sufficiently flexibility, we recommend that SQLite database be
102       distributed without any indexes. This greatly reduces the file size and
103       download time for the database file.
104
105       The optional "index" parameter should then be used by each different
106       consumer of that module to index just the columns that are of specific
107       interest and will be used in the queries that will be run on the
108       database.
109
110       The value should be set to an "ARRAY" reference containing a list of
111       column names in "tablename.columnname" form.
112
113         index => [
114             'table1.column1',
115             'table1.column2',
116         ],
117

SUPPORT

119       Bugs should be reported via the CPAN bug tracker at
120
121       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=ORLite-Mirror>
122
123       For other issues, contact the author.
124

AUTHOR

126       Adam Kennedy <adamk@cpan.org>
127

129       Copyright 2008 - 2012 Adam Kennedy.
130
131       This program is free software; you can redistribute it and/or modify it
132       under the same terms as Perl itself.
133
134       The full text of the license can be found in the LICENSE file included
135       with this module.
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139perl v5.32.0                      2020-07-28                 ORLite::Mirror(3)
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