[英]How to display actual data from DB
我正在执行SQL以显示实际正在由该人员和该老师进行教学的主题。 它应该仅显示主题名称(例如,上午8点在教师个人资料上显示“语言”)。 在数据库中,我有表格-时间表,并且有start_time和end_time数据保存在DATETIME中。 我在互连SQL和PHP然后显示时遇到问题。 我有这个SQL查询:
SELECT lessons.schoolday, lessons.start_time, lessons.end_time, lectors.lectorsurname, studentgroups.class_id, classes.grade, subjects.subjectname
FROM lessons INNER JOIN lectors ON lessons.lector_id=lectors.lector_id
INNER JOIN studentgroups ON lessons.studentgroup_id=studentgroups.studentgroup_id
INNER JOIN classes ON studentgroups.class_id=classes.class_id
INNER JOIN subjects ON lessons.subject_id=subjects.subject_id
WHERE lessons.start_time <= substring(('".date('Y-m-d H:i:s')."'),11,6)
AND lessons.end_time >= substring(('".date('Y-m-d H:i:s')."'),11,6)
AND lectors.lector_id=:id");
当我更改日期而不是间隔时(fe start_time-> 0000-00-00 08:00:00,end_time-> 0000-00-00 08:45:00),它正在工作。 但是通过这种方式,它只打印Array()。 HTML正在使用Latte模板显示,并且有条件,如果为空数组,则显示message = Teacher当前未在教学,但这也不起作用。
.......
php代码:
$stmt3 = $db->prepare(" SELECT l.schoolday, l.start_time, l.end_time, t.lectorsurname, sg.class_id, c.grade, s.subjectname
FROM lessons l
INNER JOIN lectors t ON l.lector_id=t.lector_id
INNER JOIN studentgroups sg ON l.studentgroup_id=sg.studentgroup_id
INNER JOIN classes c ON sg.class_id=c.class_id
INNER JOIN subjects s ON l.subject_id=s.subject_id
WHERE l.start_time <= CURTIME() AND l.end_time >= CURTIME() AND t.lector_id=:id
ORDER By c.grade, l.schoolday, l.start_time");
$stmt3->bindValue(":id", intval($_GET["id"]));
$stmt3->execute();
$data=$stmt3->fetchAll();
print_r($data);
$tplVars["lesson"] = $stmt3->fetchAll();
和拿铁咖啡模板
<table>
.
.
.
<tr>
<th> Aktuálne vyučuje: </th>
</tr>
{foreach $lesson as $aktual}
{if !empty($aktual['grade'])}
<tr>
<td>{$aktual['grade']} </td>
</tr>
{/if}
{if ($aktual['grade']) == NULL}
<tr> <td> <span> Učiteľ momentálne nevyučuje </span></td></tr>
{/if}
{/foreach}
</table>
搜索一些示例。 加上一些别名,使其可读性更好。 NOW()还不够吗? 看到这个链接更多的MySQL日期和时间功能
SELECT l.schoolday, l.start_time, l.end_time, t.lectorsurname, sg.class_id, c.grade, s.subjectname
FROM lessons l
INNER JOIN lectors t ON l.lector_id=t.lector_id
INNER JOIN studentgroups sg ON l.studentgroup_id=sg.studentgroup_id
INNER JOIN classes c ON sg.class_id=c.class_id
INNER JOIN subjects s ON l.subject_id=s.subject_id
WHERE l.start_time <= NOW() AND l.end_time >= NOW() AND t.lector_id=:id
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