The following was sent from my IT person, and might be helpful to others:
We had problems updating to Moodle 3.5 using MySQL 8.0 because the word system is a reserved word. Had to make the following changes:
Changed the 'system' to be '`system`'
if ($oldversion < 2017111301) {
// Rename field 'system' on table 'chat_messages' as it is a reserved word in MySQL 8+.
$table = new xmldb_table('chat_messages');
$field = new xmldb_field('`system`');
if ($dbman->field_exists($table, $field)) {
$field->set_attributes(XMLDB_TYPE_INTEGER, '1', null, XMLDB_NOTNULL, null, '0', 'groupid');
// Extend the execution time limit of the script to 2 hours.
upgrade_set_timeout(7200);
// Rename it to 'issystem'.
$dbman->rename_field($table, $field, 'issystem');
}
// Rename field 'system' on table 'chat_messages_current' as it is a reserved word in MySQL 8+.
$table = new xmldb_table('chat_messages_current');
$field = new xmldb_field('`system`');
if ($dbman->field_exists($table, $field)) {
$field->set_attributes(XMLDB_TYPE_INTEGER, '1', null, XMLDB_NOTNULL, null, '0', 'groupid');
// Extend the execution time limit of the script to 5 minutes.
upgrade_set_timeout(300);
// Rename it to 'issystem'.
$dbman->rename_field($table, $field, 'issystem');
}
// Savepoint reached.
upgrade_mod_savepoint(true, 2017111301, 'chat');
}
