<?php // $Id$

function exercise_upgrade($oldversion) {
// This function does anything necessary to upgrade
// older versions to match current functionality

    global $CFG;

    if ($oldversion < 2004062300) {
        table_column("exercise", "", "gradinggrade", "INTEGER", "4", "UNSIGNED", "0", "NOT NULL", "grade");
        table_column("exercise", "", "assessmentcomps", "INTEGER", "4", "UNSIGNED", "2", "NOT NULL", "usemaximum");
    }

    if ($oldversion < 2004090200) {
        table_column("exercise", "", "usepassword", "INTEGER", "4", "UNSIGNED", "0", "NOT NULL");
        table_column("exercise", "", "password", "VARCHAR", "32", "", "", "NOT NULL");
    }

    if ($oldversion < 2004091000) {
        table_column("exercise_assessments","generalcomment","generalcomment","text","","","","NOT NULL");
        table_column("exercise_assessments","teachercomment","teachercomment","text","","","","NOT NULL");
    }

    if ($oldversion < 2004100800) {
        include_once("$CFG->dirroot/mod/exercise/lib.php");
        exercise_refresh_events();
    }

    if ($oldversion < 2004111200) {
        execute_sql("DROP INDEX {$CFG->prefix}exercise_course_idx;",false);
        execute_sql("DROP INDEX {$CFG->prefix}exercise_submissions_exerciseid_idx;",false);
        execute_sql("DROP INDEX {$CFG->prefix}exercise_assessments_exerciseid_idx;",false);
        execute_sql("DROP INDEX {$CFG->prefix}exercise_rubrics_exerciseid_idx;",false);
        execute_sql("DROP INDEX {$CFG->prefix}exercise_grades_exerciseid_idx;",false);

        modify_database('','CREATE INDEX prefix_exercise_course_idx ON prefix_exercise (course);');
        modify_database('','CREATE INDEX prefix_exercise_submissions_exerciseid_idx ON prefix_exercise_submissions (exerciseid);');
        modify_database('','CREATE INDEX prefix_exercise_assessments_exerciseid_idx ON prefix_exercise_assessments (exerciseid);');
        modify_database('','CREATE INDEX prefix_exercise_rubrics_exerciseid_idx ON prefix_exercise_rubrics (exerciseid);');
        modify_database('','CREATE INDEX prefix_exercise_grades_exerciseid_idx ON prefix_exercise_grades (exerciseid);');
    }
        
    if ($oldversion < 2006080702) {
        table_column("exercise_submissions", "", "late", "INTEGER", "4", "UNSIGNED", "0", "NOT NULL");
    }

    return true;
}


?>