我未在准备好的语句mysql中使用，而我在OOP php daskite中是新来的

Question

我想在我的index.php中返回u，p，d的值，但我不知道该返回什么代码

$stmt = $this->mysqli->prepare("SELECT u,p,d FROM pump_price");
$stmt->execute();
$stmt->bind_result($u,$p,$d);

while ($row = $stmt->fetch()) {
    // what to return here?
}
$stmt->close();
$this->mysqli->close();

Answer 1

bind_result()函数应为结果集中的每个记录提供变量u，p和d中$u，$p和$d的值。因此，您可以尝试以下操作：

$stmt = $this->mysqli->prepare("SELECT u, p, d FROM pump_price");
$stmt->execute();
$stmt->bind_result($u,$p,$d);

while ($row = $stmt->fetch()) {
    echo "(" . $u . ", " . $p . ", " . $d . ")" . "\n";
}
$stmt->close();
$this->mysqli->close();