mysqlphp
请问这两行代码有什么区别？我试了一下都可以运行成功。
<code> $query = "insert into books values (' ".$isbn." ', ' ".$author." ', ' ".$title." ', ' ".$price." ')";</code>
<code>$query = "insert into books values (' $isbn ', ' $author ', ' $title', ' $price ')";` </code>
完整代码from PHP和MySQL Web开发(原书第4版)：
<code> <title>TODO supply a title</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <body> <h1>Book-O-Rama Book Entry Result</h1> <?php //create short variable names $isbn=$_POST['isbn']; $author=$_POST['author']; $title=$_POST['title']; $price=$_POST['price']; if (!$isbn || !$author || !$title || !$price){ echo "You have not entered all the required details. <br />". "Please go back and try again"; exit; } if (!get_magic_quotes_gpc()){ $isbn = addslashes($isbn); $author = addslashes($author); $title = addslashes($title); $price = doubleval($price); } @ $db = new mysqli('localhost', 'root', '123', 'mydb'); if (mysqli_connect_errno()){ echo "Error: Could not connect to database. Please try again later."; exit; } $query = "insert into books values (' ".$isbn." ', ' ".$author." ', ' ".$title." ', ' ".$price." ')"; $result = $db->query($query); if ($result) { echo $db->affected_rows. "book inserted into database<em style="color:transparent">本文来源[email protected]搞@^&代*@码)网9</em><strong>搞代gaodaima码</strong>."; } else { echo "An error has occurred. The item was not added."; } $db->close(); ?> </code>
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转载请注明原文链接：mysql-PHP,MySQL请问这两行代码有什么区别？
转载请注明原文链接：mysql-PHP,MySQL请问这两行代码有什么区别？
