如何在PHP中为动态查询构建参数化的PDO语句?

问题描述：

很抱歉是否已被问到.我已经看到了有关静态SQL的答案，但是在这种情况下，我想对运行时动态生成的查询字符串使用PDO-> prepare().

Apologies if this has been asked already. I've seen answers regarding static SQLs, but in this case I'd like to use PDO->prepare() for a query string that is built dynamically at runtime.

简单地讲一个例子:

$TempSQL = "SELECT field1, field2, field3 FROM table WHERE ";

if ($numberParams == 1) {
    $TempSQL = $TempSQL . " field1 = '$val1' ";
} else {
    $TempSQL = $TempSQL . " field2 = '$val2' ";
    $TempSQL = $TempSQL . " AND field3 = '$val3' ";
}

db->query($TempSQL);

如何将其重写为db-> prepare()?

How do I rewrite this as a db->prepare()?

我是否也应该动态地构建语句-> execute(array(':param'=> $ var)))?

Should I build the statement->execute(array(':param' => $var))) on the fly as well?

有没有更好/更整洁的方式?

Is there a better / neater way?

答

也许是这样的. (未试用)

Perhaps something like this. (untested)

$TempSQL = "SELECT field1, field2, field3 FROM table WHERE ";
$args=array();

if ($numberParams == 1) {
    $TempSQL = $TempSQL . " field1 = :val1"
    $args[':val1']=$val1;
} else {
    $TempSQL = $TempSQL . " field2 = :val2 and field3 = :val3";
    $args[':val2']=$val2;
    $args[':val3']=$val3;
}

$stmt=$db->prepare($TempSQL);
$stmt->execute($args);

如何在PHP中为动态查询构建参数化的PDO语句?

相关推荐