Question

if (_.has(usr, 'info.age') && _.has(usr, 'info.addr1') && _.has(usr, 'info.addr2') && _.has(usr, 'info.zipCode')) {
    // do your stuff since all criteria were met
}

$pagename = 'index.html';
$dbh = connectDb();
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $dbh->query("select 'tcount' from accessNum where pagename = '$pagename'");
$record = $stmt->fetchAll();

if (sizeof($stmt) != 0) {
    $counter = $record['tcount'];
    $counter++;
    $dbh->exec("update accessNum set tcount = '$counter' where pagename = '$pagename'");
}

每次更新时，tcount都会保留1。为什么会发生？

Answer 1

如果你使用int，你就不需要像这样的变量

if (sizeof($stmt) != 0) {
    $counter = $record['tcount'];
    $counter++;
    $dbh->exec("update accessNum set tcount = $counter where pagename = '$pagename'");
}

Answer 2

SELECT查询

中的列名称周围不需要引号

$stmt = $dbh->query("select tcount from accessNum where pagename = '$pagename'");

此外，UPDATE查询中的数字周围不需要引号

$dbh->exec("update accessNum set tcount = $counter where pagename = '$pagename'");

Answer 3

始终使用反引号转义列和表名，并使用引号转义值。他们在MySQL中完全不同。这应该有效：

$pagename = 'index.html';
$dbh = connectDb();
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $dbh->query("select `tcount` from `accessNum` where `pagename` = '$pagename'");
$record = $stmt->fetchAll();

if (sizeof($stmt) != 0) {
    $counter = $record['tcount'];
    $counter++;
    $dbh->exec("update `accessNum` set `tcount` = '$counter' where `pagename` = '$pagename'");
}

如何将int数组添加到变量中

3 个答案: