Question

通过我的网站，我会在很多不同的设置中显示不同的产品，以确保结果的数量是正确的，我想用PHP回应它们。到目前为止，我已经尝试按照我所知道的方式回应它们，但这种做法并没有奏效。

我要回显的页面上的代码包含顶部的函数文件的require。我试过了：

<?php
//Call the count_stock() function
$result_count = count_stock();
?>
<p>Showing 1-9 of <?php echo $result_count['COUNT(*)']; ?> results.</p>
<p>Showing 1-9 of <?php echo $result_count[0]; ?> results.</p>
<p>Showing 1-9 of <?php print_r($result_count[0]); ?> results.</p>

我执行查询的功能是：

//create a function to count get_stock
function count_stock() {
    global $conn;
    //query the database to count the data entries in the stock table
    $sql = 'SELECT COUNT(*) FROM stock';
    //use a prepared statement to enhance security
    $statement = $conn->prepare($sql);
    $statement->execute();
    $result_count = $statement->fetchAll();
    $statement->closeCursor();
    return $result_count;
}

Answer 1

将您的功能更改为：

function count_stock() {
        global $conn;
        //query the database to count the data entries in the stock table
        $sql = 'SELECT COUNT(*) as tot FROM stock';
        //use a prepared statement to enhance security
        $statement = $conn->prepare($sql);
        $statement->execute();
        $result_count = $statement->fetch();
        $statement->closeCursor();
        return $result_count['tot'];
    }

Answer 2

从

改变

//create a function to count get_stock
function count_stock() {
    global $conn;
    //query the database to count the data entries in the stock table
    $sql = 'SELECT COUNT(*) FROM stock';
    //use a prepared statement to enhance security
    $statement = $conn->prepare($sql);
    $statement->execute();
    $result_count = $statement->fetchAll();
    $statement->closeCursor();
    return $result_count;
}

到

//create a function to count get_stock
function count_stock() {
    global $conn;
    //query the database to count the data entries in the stock table
    $sql = 'SELECT COUNT(*) as total_result FROM stock';
    //use a prepared statement to enhance security
    $statement = $conn->prepare($sql);
    $statement->execute();
    $result = $statement->get_result();
    $row = $result->fetch_assoc();
    $statement->closeCursor();
    return $row['total_result'];
}

也从

改变

<?php
//Call the count_stock() function
$result_count = count_stock();
?>
<p>Showing 1-9 of <?php echo $result_count['COUNT(*)']; ?> results.</p>
<p>Showing 1-9 of <?php echo $result_count[0]; ?> results.</p>
<p>Showing 1-9 of <?php print_r($result_count[0]); ?> results.</p>

到

<?php
//Call the count_stock() function
$result_count = count_stock();
?>
<p>Showing 1-9 of <?php echo $result_count; ?> results.</p>

Answer 3

试试这个

$sql = "SELECT count(*) FROM `stock"; 
$result = $con->prepare($sql); 
$result->execute(); 
$number_of_rows = $result->fetchColumn();

上面的代码示例使用了一个预准备语句，在许多情况下，为了计算行数，这可能是不必要的，所以：

$nRows = $pdo->query('select count(*) from blah')->fetchColumn(); 
echo $nRows;

参考：http://php.net/manual/en/pdostatement.rowcount.php

注意： PDO有PDOStatement :: rowCount（），显然在MySql中不起作用。多么痛苦

回应SELECT COUNT（*）查询

3 个答案: