如何在MySQL查询中接受两个正确的答案？

时间：2015-12-06 04:16:16

标签： mysql database

我有四个选择，其中两个可以是正确答案。

if($isCorrect == "answer1"){
    $sql2 = mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', '1')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', '0')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer3', '0')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer4', '0')")or die(mysql_error());
    $msg = 'You questions has been succesfully added!';
  header('location: addQuestions.php?msg='.$msg.'');
exit();
}
if($isCorrect == "answer2"){
    $sql2 = mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', '1')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', '0')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer3', '0')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer4', '0')")or die(mysql_error());
    $msg = 'You questions has been succesfully added!';
  header('location: addQuestions.php?msg='.$msg.'');
exit();
}
if($isCorrect == "answer3"){
    $sql2 = mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer3', '1')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', '0')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', '0')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer4', '0')")or die(mysql_error());
    $msg = 'You questions has been succesfully added!';
  header('location: addQuestions.php?msg='.$msg.'');
exit();
}
if($isCorrect == "answer4"){
    $sql2 = mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer4', '1')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', '0')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', '0')")or die(mysql_error());
    mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer3', '0')")or die(mysql_error());
    $msg = 'You questions has been succesfully added!';
  header('location: addQuestions.php?msg='.$msg.'');
exit();
    }
}

当我运行这些时，只有一个被接受为正确答案。

enter image description here

我的数据库有什么方法可以接受两个正确的答案吗？我使用枚举（0,1）来检查正确的答案。

1 个答案:

答案 0 :(得分：0)

有人可能会在稍后回复一个更好的答案，这只是为了让球滚动。

我首先要重构您目前所拥有的内容，如下所示：

$(document).ready(function(){
    $('[data-toggle="tooltip"]').tooltip({'delay': { show: 5000, hide: 3000 }
    });   
});

我不知道您使用// note: there are a lot of ways to make the following cleaner (use an array, // write a function, etc.), but for the sake of time and simplicity I'll // leave it at this // if $isCorrect == "answer1", $answer1Correct = '1', else $answer1Correct = '0' $answer1Correct = ($isCorrect == "answer1" ? '1' : '0'); $answer2Correct = ($isCorrect == "answer2" ? '1' : '0'); $answer3Correct = ($isCorrect == "answer3" ? '1' : '0'); $answer4Correct = ($isCorrect == "answer4" ? '1' : '0'); mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', $answer1Correct)")or die(mysql_error()); mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', $answer2Correct)")or die(mysql_error()); mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer3', $answer3Correct)")or die(mysql_error()); mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer4', $answer4Correct)")or die(mysql_error()); $msg = 'You questions has been succesfully added!'; header('location: addQuestions.php?msg='.$msg.''); exit(); 的内容，我在这里忽略了它。

到目前为止，这应该与您目前拥有的相同

然后，为了进行您正在寻找的更改，我会将$sql2从字符串更改为字符串数组。

例如，假设答案1和4都是正确的：     $ isCorrect = array（＆＃39; answer1＆＃39;，＆＃39; answer4＆＃39;）;

然后您使用in_array()，以便$isCorrect部分变为：

$answer1Correct

修改：更多改进

而不是使用三元运算符（// if "answer1" is in the $isCorrect array, set $answer1Correct to '1', otherwise set it to '0' $answer1Correct = (in_array("answer1", $isCorrect) ? '1' : '0'); $answer2Correct = (in_array("answer2", $isCorrect) ? '1' : '0'); $answer3Correct = (in_array("answer3", $isCorrect) ? '1' : '0'); $answer4Correct = (in_array("answer4", $isCorrect) ? '1' : '0'); ），您可以convert a boolean to an integer，然后将其转换为字符串。

condition ? true_value : false_value返回整数1，(int)true返回字符串＆＃39; 1＆＃39;。

所以你的$ answer1Correct部分变为：     $ answer1Correct =（string）（int）in_array（＆＃34; answer1＆＃34;，$ isCorrect）;     $ answer2Correct =（string）（int）in_array（＆＃34; answer2＆＃34;，$ isCorrect）;     $ answer3Correct =（string）（int）in_array（＆＃34; answer3＆＃34;，$ isCorrect）;     $ answer4Correct =（string）（int）in_array（＆＃34; answer4＆＃34;，$ isCorrect）;

但是复制+粘贴这么多都有点乏味，更多dry选项是用函数替换(string)(int)true：

$answer1Correct

然后您的查询变为：

function answerIsCorrect($answerNumber, $allCorrectAnswers) {
  return (string)(int)in_array("answer" . $answerNumber, $allCorrectAnswers);
}

现在你可以将整个事情作为一个循环，所以你的整个脚本可以缩短为：

mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', answerIsCorrect(1, $isCorrect)")or die(mysql_error());

如果您将function answerIsCorrect($answerNumber, $allCorrectAnswers) { return (string)(int)in_array("answer" . $answerNumber, $allCorrectAnswers); } $answers = array( 1 => $answer1, 2 => $answer2, 3 => $answer3, 4 => $answer4 ) for($i = 1; $i <= 4; $i++) { mysql_query("INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', $answers[$i], answerIsCorrect($i, $isCorrect)")or die(mysql_error()); } 从字符串更改为字符串数组，如上所述。

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