使用 mysqli 计算行数和传递信息

Question

我一直在尝试将 php 页面转换为 mysqli，但遇到了一些问题。鉴于下面的代码，以及我订购的工作方式，我想知道使用 mysqli 方法的更好方法是什么。

是否有 mysqli 替代 mysql_num_rows 或者是计算所需行数的不同方法？

我将如何使用 mysqli 执行以下操作？：

$data = mysql_query($countQuery) or die(mysql_error());
$rowcount = mysql_num_rows($data);

mysql_fetch_assoc 的替代方案是什么？我觉得我不应该使用我正在使用的当前行方法，即使有替换功能，那么正确的方法是什么？

对于这些问题，我深表歉意，但到目前为止我自己还无法确定答案。

<?php
$con = mysqli_connect("localhost", "user", "", "ebay");
if (!$con) {
    echo "Can't connect to MySQL Server. Errorcode: %s\n". mysqli_connect_error();
    exit;
}
$con->query("SET NAMES 'utf8'");
$cmd = "word";
//normally retrieved from GET
if($cmd=="deleterec") {
    $deleteQuery = "DELETE FROM AUCTIONS1 WHERE ARTICLE_NO = ?";
    if ($delRecord = $con->prepare($deleteQuery)) {
        $delRecord->bind_param("s", $pk);
        $delRecord->execute();
    }
}
$table = 'AUCTIONS';
$brand = "test";
$countQuery = "SELECT ARTICLE_NO FROM ? WHERE upper(ARTICLE_NAME) LIKE '% ? %'";
if ($numRecords = $con->prepare($countQuery)) {
    $numRecords->bind_param("ss", $table, $brand);
    $numRecords->execute();
    $data = $con->query($countQuery) or die(print_r($con->error));
    $rowcount = mysql_num_rows($data);
    $rows = getRowsByArticleSearch($query, $table, $max);
    $last = ceil($rowcount/$page_rows);
}
$self = htmlspecialchars($_SERVER['PHP_SELF'],ENT_QUOTES,'utf-8');
foreach ($rows as $row) // print table rows {
    echo '<tr>' . "\n";
    echo '<td><a href="#" onclick="doThings(\'Layer2\', \'' . $pk . '\')">'.$row['USERNAME'].'</a></td>' . "\n";
    // repeated for each column
}
function getRowsByArticleSearch($searchString, $table, $max) {
    global $con;
    $recordsQuery = "SELECT ARTICLE_NO, USERNAME, ACCESSSTARTS, ARTICLE_NAME, date_format(str_to_date(ACCESSSTARTS, '%d/%m/%Y %k:%i:%s'), '%d %m %Y' ) AS shortDate FROM ? WHERE upper(ARTICLE_NAME) LIKE '%?%' ORDER BY str_to_date(ACCESSSTARTS, '%d/%m/%Y %k:%i:%s')" . $max;
    if ($getRecords = $con->prepare($recordsQuery)) {
        $getRecords->bind_param("ss", $searchString, $table);
        $getRecords->execute();
        $getRecords->bind_result($ARTICLE_NO, $USERNAME, $ACCESSSTARTS, $ARTICLE_NAME, $shortDate);
        while ($getRecords->fetch()) {
            $result = $con->query($recordsQuery);
            $rows = array();
            while($row = mysql_fetch_assoc($result)) {
                $rows[] = $row;
            }
            return $rows;
        }
    }
}

Answer 1

我通常在执行后直接使用它：

 $query->execute();
 // store the result first
 $query->store_result();
 $rows = $query->num_rows;

Answer 2

其实，回答第一个问题：

$data = mysql_query($countQuery) or die(mysql_error());
$rowcount = mysql_num_rows($data);

如果您想使用 mysqli 执行此操作，则 mysqli_num_rows 可以正常工作。唯一的区别是，请记住将连接参数放在查询中。

$data = mysqli_query($dbc,$countQuery) or die(mysql_error());

Answer 3

我已经使用正确的属性/函数调用重写了您的代码示例，以解决您在问题中提到的两个问题：

<?php
$con = mysqli::connect("localhost", "user", "", "ebay");

if (!$con) {
    echo "Can't connect to MySQL Server. Errorcode: %s\n". mysqli_connect_error();
    exit;
}

$con->query("SET NAMES 'utf8'");
$cmd = "word";

//normally retrieved from GET
if($cmd=="deleterec") {
    $deleteQuery = "DELETE FROM AUCTIONS1 WHERE ARTICLE_NO = ?";
    if ($delRecord = $con->prepare($deleteQuery)) {
        $delRecord->bind_param("s", $pk);
        $delRecord->execute();
    }
}

$table = 'AUCTIONS';
$brand = "test";
$countQuery = "SELECT ARTICLE_NO FROM ? WHERE upper(ARTICLE_NAME) LIKE '% ? %'";

if ($numRecords = $con->prepare($countQuery)) {
    $numRecords->bind_param("ss", $table, $brand);
    $numRecords->execute();
    $data = $con->query($countQuery) or die(print_r($con->error));

    // Here is the property that you can reference to determine the affected rows from the previous query. -- gabriel
    $rowcount = $data->num_rows; 
    $rows = getRowsByArticleSearch($query, $table, $max);
    $last = ceil($rowcount/$page_rows);
}

$self = htmlspecialchars($_SERVER['PHP_SELF'],ENT_QUOTES,'utf-8');

foreach ($rows as $row) // print table rows {
    echo '<tr>' . "\n";
    echo '<td><a href="#" onclick="doThings(\'Layer2\', \'' . $pk . '\')">'.$row['USERNAME'].'</a></td>' . "\n";
    // repeated for each column
}

function getRowsByArticleSearch($searchString, $table, $max) {
    //global $con; Globals are BAD!! Please don't use.
    $con = mysqli::connet("localhost", "user", "", "ebay");

    $recordsQuery = "SELECT ARTICLE_NO, USERNAME, ACCESSSTARTS, ARTICLE_NAME, date_format(str_to_date(ACCESSSTARTS, '%d/%m/%Y %k:%i:%s'), '%d %m %Y' ) AS shortDate FROM ? WHERE upper(ARTICLE_NAME) LIKE '%?%' ORDER BY str_to_date(ACCESSSTARTS, '%d/%m/%Y %k:%i:%s')" . $max;
    if ($getRecords = $con->prepare($recordsQuery)) {
        $getRecords->bind_param("ss", $searchString, $table);
        $getRecords->execute();
        $getRecords->bind_result($ARTICLE_NO, $USERNAME, $ACCESSSTARTS, $ARTICLE_NAME, $shortDate);
        while ($getRecords->fetch()) {
                $result = $con->query($recordsQuery);
                $rows = array();

                // Notice the adjusted function call to retrieve the associate array for each record within the result set. -- gabriel
                while($row = $result->fetch_assoc()) {
                        $rows[] = $row;
                }
                return $rows;
        }
    }
}

但是，我想补充一点，dusoft 在评估 MySQLi 存在错误并且已知会产生问题时是正确的。正是出于这个原因，我们不得不从 MySQLi 切换到 PDO（至少从 5.1 开始，它是 PHP 原生的），从那以后我们没有遇到任何问题。我强烈建议您查看 PDO 或 Pear 库之一，以实际提供您的数据库连接接口。

Answer 4

你可以使用：

$data->num_rows();
$data->fetch_assoc();

您可以查看文档以获取更多信息 num_rows 和 fetch_assoc。