External database enrolment

You may use a external database (of nearly any kind) to control your enrolments. It is assumed your external database contains a field containing a course ID, a field containing a user ID, and optionally a field containing a role. These are compared against fields that you choose in the local course, user tables, and role tables.

The following are the supported data sources, but note that you will need to have to compile PHP with the appropriate options or through ODBC.

• access
• ado
• mssql
• borland_ibase
• csv
• db2
• fbsql
• firebird
• ibase
• informix72
• informix
• mysql
• mysqlt
• oci805
• oci8
• oci8po
• odbc
• odbc_mssql
• odbc_oracle
• oracle
• postgres64
• postgres7
• postgres
• proxy
• sqlanywhere
• sybase
• vfp

Enrolment & Unenrolment

External database enrolment happens at the moment when a user logs into Moodle. The plugin will attempt to automatically enrol the student in all their courses according to the data in the external database and, optionally, create empty courses where they do not already exist. To check if it is working, you can log in as a student and then check that their list of courses is as you would expect.

The process also unenrols users from courses if they are no longer in the database. User records are marked according to their original enrolment method. Therefore the external database plugin can only unenrol users who were enroled by the plugin in the first place.

Enrolment & Roles

The "enrol_db_defaultcourseroleid" setting in the plugin settings page specifies the role that the user will take when they are added to the course. The default setting will set them to the course default setting (initially "student"). However, you can specify a field in the external table (specified in the "enrol_db_remoterolefield" setting) that contains the short name for the user's role. This could, for example, be used to enrol both students and teachers into courses using a suitably configured database.

Creating Courses

Optionally courses that do not exist in the Moodle site can be created. Switch the "enrol_db_autocreate" option to "yes" in the plugin settings. You can additionally specify the Category into which the new course will be placed and may also specify a "template" course from which the new course will be copied.

Synchronization Script

A script is provided that can synchronize all your user enrollments at once - both adding and removing users (and courses if specified). The script is called auth_db_sync_users.php and is found in the auth/db folder.

This script is meant to be called from a system cronjob to sync moodle user accounts with external database. It is required when using internal passwords (== passwords not defined in external database). Example cron entry:

   # 5 minutes past 4am
   5 4 * * * /usr/bin/php -c /path/to/php.ini /path/to/moodle/auth/db/auth_db_sync_users.php

Notes:

• If you have a large number of users, you may want to raise the memory limits by passing -d memory_limit=256M
• For debugging & better logging, you are encouraged to use in the command line: -d log_errors=1 -d error_reporting=E_ALL -d display_errors=0 -d html_errors=0
• This only works for users that already exist in your Moodle site (see your authorization plugin)

Setting It Up

You will need to perform (as a minimum) the following steps to enable external database enrolment - only a single table is required in the database which contains a record for every user/course combination. If the table is large it is a good idea to make sure appropriate indexes have been created:

• Use an existing database or create a new one. Use an existing or create a new table with the following minimum fields:
  • course identifier (to match unique course identifier in Moodle)
  • user identifier (to match unique user identifier in Moodle)
  • (optional) role identifier (to match unique role identifier in Moodle)
• Populate the database table. Each user/course combination to have a record in the table
• In Moodle, go to Site Administration => Courses => Enrolments, find External Database in the list and click Settings
• In the top panel, select the database type (make sure you have the necessary configuration in PHP for that type) and then supply the information to connect to the database.
• The middle panel creates the mapping between Moodle and the external database. The first three settings are for the local (Moodle) field names and the last three for the remote (external database) settings. They are in the same order.
  • enrol_localcoursefield / enrol_remotecoursefield - in Moodle the name of the field in the course settings the uniquely identifies the course (e.g., idnumber). In the external database the name of the matching field.
  • enrol_localuserfield / enrol_remoteuserfield - in Moodle the name of the field in the user profile that uniquely identified the user (e.g., idnumber). In the external database the name of the matching field.
  • enrol_db_localrolefield / enrol_db_remoterolefield - (optional) in Moodle the name of the field in the role edit page the uniquely identifies the role (e.g., shortname). In the external database the name of the matching field.
• The Roles panel specifies the role that the user will get in the course if their role is not specified in the external database.
• The final panel enables auto creation of courses.
• Save changes, and then tick the box to enable external database enrolment.

Field Mapping Example:

Choose your fields from the Moodle database:

• enrol_localcoursefield: A course identifier from mdl_course, e.g. "idnumber"
• enrol_localuserfield: A user identifier from mdl_user, e.g. "idnumber"
• enrol_localrolefield: (optional) A role identifier from mdl_role, e.g. "shortname"

Create a view in your external database which matches the chosen field values from Moodle:

• enrol_remotecoursefield: A matching course identifier from your external database table, e.g. "course_number"
• enrol_remoteuserfield: A matching user identifier from your external database table, e.g. "userid"
• enrol_remoterolefield: (optional) A matching role identifier from your external database table, e.g. "role_name"

See also

• Using Moodle MySQL enrolment plugin doesn't seem to work forum discussion
• Using Moodle Someone explain external database enrolment, please?? forum discussion