Question

我找不到我需要的东西。我试图在quizzer创建从数据库中提问。目前，它需要数据库中的所有问题以及我需要它随机提出10个问题。我刚刚开始学习如何编码。

以下是我的问题代码和答案：

<?php
    //Set question number
    $number = (int) $_GET['n'];

    /*
    *   Get total questions
    */
    $query = "SELECT * FROM `klausimai`";
    //Get result
    $results = $mysqli->query($query) or die($mysqli->error.__LINE__);
    $total = $results->num_rows;

    /*
    *   Get Question
    */
    $query = "SELECT * FROM `klausimai`
                WHERE question_number = $number";
    //Get result
    $result = $mysqli->query($query) or die($mysqli->error.__LINE__);

    $question = $result->fetch_assoc();

    /*
    *   Get Choices
    */
    $query = "SELECT * FROM `atsakymai`
                WHERE question_number = $number";
    //Get results
    $choices = $mysqli->query($query) or die($mysqli->error.__LINE__);
?>

Answer 1

如上所述，使用SQL LIMIT语句将klausimai查询结果限制为10（$ query =“SELECT * FROM klausimai LIMIT 10”;）：

<?php
//Set question number
$number = (int) $_GET['n'];

/*
*   Get total questions
*/
$query = "SELECT * FROM `klausimai`  LIMIT 10";
//Get result
$results = $mysqli->query($query) or die($mysqli->error.__LINE__);
$total = $results->num_rows;

/*
*   Get Question
*/
$query = "SELECT * FROM `klausimai`
            WHERE question_number = $number";
//Get result
$result = $mysqli->query($query) or die($mysqli->error.__LINE__);

$question = $result->fetch_assoc();

/*
*   Get Choices
*/
$query = "SELECT * FROM `atsakymai`
            WHERE question_number = $number";
//Get results
$choices = $mysqli->query($query) or die($mysqli->error.__LINE__);
?>

Answer 2

你的代码很好，但要打印10个直接从你的mysql数据库获取的随机问题，执行以下查询：

 $query = SELECT * FROM `klausimai`
ORDER BY RAND()
 LIMIT 10;
while(row=mysql_fetch_array($query) {

echo $row['question_feild'];
//Replace 'question_feild' it with your question_body column of your table 

//assuming you have 2 choices for a particular question 

echo $row['choice1']; // Same replace it with your choice/answer columns
echo $row['choice2']; // Same replace it with your choice/answer columns 

}

Answer 3

试试这个：

/*
 *  Get Questions
*/
$query = "SELECT * FROM `klausimai` ORDER BY RAND() LIMIT 10";
$result = mysqli_query($conn, $query);
while($row = mysqli_fetch_assoc($result)){
    echo "Question number " . $row["question_number"] . "<br/>";
    echo "Choices of question are:<br/>";
    /*
     *  Get Choices
    */
    $query = "SELECT * FROM `atsakymai` WHERE `question_number` = " . $row["question_number"];
    $result = mysqli_query($conn, $query);
    $i = 1;
    while($row2 = mysqli_fetch_assoc($result)){
        echo $i.") ".$row2["choice_text"]."<br/>";
        $i++;
    }
}

MySQL随机选择的问题

3 个答案: