在我的测验系统中,我现在尝试制作问题的页面,但当我尝试向页面显示问题行和答案行时,它没有显示任何内容。
<?php
$q_qselect = mysql_query("SELECT * FROM `questions`");
$q_qnumrows = mysql_num_rows($q_select);
for($i=0;$i<$q_qnumrows;$i++){
$q_qselect = mysql_query("SELECT * FROM `questions` WHERE `id`='$i'");
$q_aselect = mysql_query("SELECT * FROM `answers` WHERE `question_id`='$i'");
$q = mysql_fetch_assoc($q_qselect);
$a = mysql_fetch_assoc($q_aselect);
echo $q['question'] . "<br />";
echo $a['answer'] . "<br />";
}
?>
另外,另一个问题 - 我怎样才能真正检查他是否选择了正确的答案? (答案表中的字段为correct
?
答案 0 :(得分:0)
<?php
$question = mysql_query("SELECT questions.*, answers.* FROM questions inner join answers on questions.qid=answers.id");
while($row = mysql_fetch_array($question)) {
echo $row['question_column_name_in_DB'].'<br />' .$row['answer_column_name_in_DB'].'<br />';
}
?>
将列名更改为适当的名称。一旦你开始工作,请查看PDO。
答案 1 :(得分:0)
您可以尝试使用As Like Follow ....
<?php
$query_result = mysql_query("SELECT questions.*, answers.* FROM questions LEFT JOIN answers on questions.id=answers.`question_id`");
while($row = mysql_fetch_array($query_result)) {
echo $row ['question'] . "<br />";
echo $row ['answer'] . "<br />";
}
?>