我目前习惯了mysqli,并且正在尝试转换我在mysql中编写的代码。我使用Procedural样式来转换代码,但是我意识到在mysqli中你可以使用预处理语句,而不是使用mysqli_real_escape_string。我试图理解这些准备好的陈述,但是我无法理解它们。如何将以下代码转换为预准备语句?
function user_exists($email){
$query = mysqli_query($GLOBALS["___mysqli_ston"], "SELECT `mem_id` FROM `members` WHERE `mem_email`='$email'");
$query_result = mysqli_num_rows($query);
return $query_result;
}
答案 0 :(得分:2)
function user_exists($email){
$stmt = mysqli_prepare($GLOBALS["___mysqli_ston"], "SELECT `mem_id` FROM `members` WHERE `mem_email`=?");
mysqli_stmt_bind_param($stmt,"s",$email);
mysqli_stmt_execute($stmt);
mysqli_stmt_store_result($stmt);
$query_result=mysqli_stmt_num_rows($stmt);
mysqli_stmt_free_result($stmt);
return $query_result;
}
说真的,使用OOP风格会更好......
function user_exists($email){
global $___mysqli_ston;//just follow your style
$stmt = $___mysqli_ston->prepare("SELECT `mem_id` FROM `members` WHERE `mem_email`=?");
$stmt->bind_param("s",$email);
$stmt->execute();
$stmt->store_result();
$query_result=$stmt->num_rows;
$stmt->free_result();
return $query_result;
}