代码：
if (!file_exists('../../config.php')) {
header('Location: ../../install.php');
die;
}
require_once('../../config.php');
require_once("../../mod/feedback/lib.php");
// 课程ID
$course_id = 22; //课程ID
/*
$sql = "select
m.id as m_id,
m.name as m_name,
cm.id as cm_id,
cm.course as cm_course,
cm.module as cm_module,
cm.instance as cm_instance,
cm.instance as cm_instance,
cm.section as cm_section
from {modules} m, {course_modules} cm where cm.module=m.id and cm.course = '$course_id' and cm.id in (SELECT cs.sequence FROM {course_sections} cs where cs.course = '$course_id')";
*/
// 显示所有tables
//$sql = "SHOW TABLES";
// 显示某一表的所有字段
//$sql = "SHOW COLUMNS FROM {quiz_feedback}";
// 自定义查询
$sql = "select * FROM {course_modules} cm where cm.course = '$course_id' and cm.module=7";
//$sql = "select cm.*, m.* from {modules} m, {course_modules} cm where cm.module=m.id and cm.course = '$course_id' and cm.id in (SELECT cs.sequence FROM {course_sections} cs where cs.course = '$course_id')";
$res = $DB->get_records_sql($sql);
echo '
'; echo '$cm===>'; print_r($res); echo '
'; die;
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