Question

我需要在INSERT和SELECT FROM语句中使用真正的转义吗？

为什么我在以下示例中使用的语法不起作用（这只是我尝试过的众多方法之一）？

//insert user input for word 1
$sql = "INSERT INTO test (Word1, Word2, Word3, Word4, Word5)
VALUES('$Word1','$Word2','$Word3','$Word4','$Word5')",
mysql_real_escape_string($Word1),
mysql_real_escape_string($Word2),
mysql_real_escape_string($Word3),
mysql_real_escape_string($Word4),
mysql_real_escape_string($Word5);
if(!mysql_query($sql,$con))
{
  die('Error: ' . mysql_error());
}

Answer 1

看起来您正在尝试使用sprintf()，要正确地执行此操作，您需要重新格式化代码：

$sql = sprintf("INSERT INTO test (Word1, Word2, Word3, Word4, Word5)
VALUES('%s','%s','%s','%s','%s')",
mysql_real_escape_string($Word1),
mysql_real_escape_string($Word2),
mysql_real_escape_string($Word3),
mysql_real_escape_string($Word4),
mysql_real_escape_string($Word5)
);

Answer 2

我强烈建议您完全避免转义，并使用prepared statements直接转到mysqli::prepare，也许通过PDO。它最终更简单，更安全：

$dsn = 'mysql:dbname=test;host=127.0.0.1';
$user = 'dbuser';
$password = 'dbpass';

$dbh = new PDO($dsn, $user, $password);

$sql =
    'INSERT INTO mytable ' .
    '(Word1, Word2, Word3, Word4, Word5)' .
    'VALUES(?, ?, ?, ?, ?)';

$stmt = $dbh->prepare($sql);

$words = array('word1', 'word2', 'word3', 'word4', 'word5');
$stmt->execute($words);

$words = array('word6', 'word7', 'word8', 'word9', 'word10');
$stmt->execute($words);

mysql_real_escape_string（）不会转义任何内容

2 个答案: