Question

我使用mysqli_fetch_field在while循环中自动填充标题名称。我收到了标题，但它始终缺少第一个标题。我正在使用mysqli_fetch_row并获取表数据的正确列数。

function tableQuery($sql){
    $query = mysqli_query($conn, $sql);
    $columns = 0;

    $tableInfo = mysqli_fetch_field($query);
    echo "<center><h1>Results for " . $tableInfo->table . "</h1></center>";

    echo "<table>";
    echo "<tr>";
        while($headers = mysqli_fetch_field($query)) {
            echo "<th>" . $headers->name . "</th>";
            $columns++;
        }
    echo "</tr>";

        while($row = mysqli_fetch_row($query)) {
            echo "<tr>";
                for ($n = 0; $n <= $columns; $n++) {
                    echo "<td>" . $row[$n] . "</td>";
                }
            echo "</tr>";
        }
    echo "</table>";
}

如果我通过$sql = "SELECT id, name, date FROM users"我的输出如下：

name |   date
______________________________
1    |  Michael  |  1/1/2018
______________________________
2    |    Jack   |  2/5/2018
______________________________
3    |    David  |  4/15/2018

例如，它错过了id表头。当我var_dump($headers->name)时，我看不到id

Answer 1

谢谢 @cdhowie ，问题是我在$tableInfo中获取列名称，因此要么删除表格信息，要么这样做：

function tableQuery($sql){
    $query = mysqli_query($conn, $sql);
    $columns = 0;
    $headerSet = false;

    echo "<table>";
    echo "<tr>";
        while($headers = mysqli_fetch_field($query)) {
            if(!$headerSet){
                echo "<h1> Results for " . $headers->name . "</h1>";
                headerSet = true;
            }
            echo "<th>" . $headers->name . "</th>";
            $columns++;
        }
    echo "</tr>";

        while($row = mysqli_fetch_row($query)) {
            echo "<tr>";
                for ($n = 0; $n <= $columns; $n++) {
                    echo "<td>" . $row[$n] . "</td>";
                }
            echo "</tr>";
        }
    echo "</table>";
}

Answer 2

替换：

while($headers = mysqli_fetch_field($query)) {
    echo "<th>" . $headers->name . "</th>";
    $columns++;
}

使用：

do {
    echo "<th>" . $tableInfo->name . "</th>";
    $columns++;
} while($tableInfo = mysqli_fetch_field($query))

Answer 3

你需要的是将指针设置回0（完成查询后）

mysqli_field_seek（$ query，0）;

...  
mysqli_field_seek($query,0);

echo "<table>";
echo "<tr>";
    while($headers = mysqli_fetch_field($query)) {
        echo "<th>" . $headers->name . "</th>";
        $columns++;
    }
echo "</tr>";
...

mysqli_fetch_field不返回第一个列名

3 个答案: