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| <p class="note">'''Note''': This page outlines ideas for the XMLDB/SQLite project. It's a ''specification under construction''! If you have any comments or suggestions, please add them to the [[Talk:Student projects/SQLite|page comments]].''</p>
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| ==Summary==
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| This project is part of the 2008 edition of Google Summer of Code (GSoC). Mentor: Penny Leach. Student: Andrei Bautu.
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| The objective of this project is to extend Moodle's database support and features. The main working directions established in the proposal are:
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| * implement SQLite in Moodle database abstraction layer;
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| * implement a tool which will allow administrators to copy a live Moodle database and switch into 'testing mode' using a SQLite copy of the live database.
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| ===SQLite support===
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| Adding support for SQLite in Moodle requires a careful analysis of compatibility between Moodle's database requirements and SQLite's features (e.g. https://docs.moodle.org/en/Development:XMLDB_problems).
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| SQLite supports almost all of the features of SQL92 (see http://www.sqlite.org/omitted.html). Some areas that need special attention are:
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| * proper settings for Unicode support, long field names, numeric/associative fetches, metadata support;
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| * incompatible SQL commands (e.g. SQLite does not support MySQL's TRUNCATE because it is not part of standard SQL);
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| * unsupported SQL commands (SQLite does not support GRANT/REVOKE);
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| * unsupported SQL keywords (SQLite does not support right and full join);
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| * security issues (in a misconfigured environment, the SQLite database may be downloaded).
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| A serious limitation of SQLite is the limited ALTER TABLE command. In this case, the general solution for the missing clauses problem consists in replacing the query with a series of queries that will create a second table to replace the original one. This will be done by the database layer.
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| ===Testing mode tool===
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| Using this tool, the live database will be copied to a SQLite testing database. This will allow administrators to experiment in testing mode without performing a backup of the live database or worrying about breaking their live site. The tool will use Moodle's XMLDB to replicate the data from the live database to the test database.
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| ==Project timeline==
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| * April, 14 – May, 25 – develop specification
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| ** discus required functionality with the mentor;
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| ** analyze database incompatibilities and possible solutions;
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| **collect feedback from the mentor and community.
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| * May, 26 – June, 8 – SQLite support
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| ** implement SQLite support in Moodle database abstraction layer;
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| ** test and benchmark SQLite support
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| * June, 9 – July, 31 – Testing mode tool
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| ** implement database migration mechanism;
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| ** provide alternative solutions for non-standard SQL commands in Moodle (if necesary)
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| * August, 1 – August, 18 – remove reported bugs
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| * September, 3 – submit code and resource files Google
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| ==Completion criteria==
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| Moodle will allow users to:
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| * work with SQLite databases;
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| * use testing mode (i.e. replicate a live database to a SQlite test database)
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| ==See also==
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| *[[GSOC/2008]]
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| *[http://code.google.com/soc/2008/moodle/appinfo.html?csaid=5800332C0A064CB0 XMLDB/SQLite application abstract]
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| *Using Moodle [http://moodle.org/mod/forum/discuss.php?d=88827 How to add sqlite-support?] forum discussion
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| [[Category:Project]]
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