[英]How can I check if a row is empty in mySQL using PDO?
這通常是我檢查空結果的方式: mysql_fetch_assoc
但是,我將PDO用於客戶端,並且在此登錄功能中,我想返回一些文本,數字或布爾值以表示是否找到行。
public function Login ($email,$password)
{
$sqlQuery="SELECT * FROM db_user WHERE email= '".$email."' AND password='".$password." '";
$statement = $this->_dbHandle->prepare($sqlQuery); // prepare a PDO statement
$statement -> execute();
$dataSet= [];
if(mysql_num_rows($statement) == 1){
echo 'login true';
} else {
echo 'login false';
}
其他兩個答案基本上是不可接受的。
並不是因為它們缺乏清潔度,而是因為它們非常危險
public function Login ($email,$password)
{
$sql="SELECT 1 FROM db_user WHERE email=? AND password=?";
$stmt = $this->_dbHandle->prepare($sql);
$statement -> execute([$email, $password]);
return $stmt->fetchColumn();
}
您應該使用准備好的語句,而不僅僅是模仿它們。
$sqlQuery="SELECT * FROM db_user WHERE email= '".$email."' AND password='".$password." '";
$statement = $this->_dbHandle->prepare($sqlQuery); // prepare a PDO statement
$statement -> execute();
$rows = $statement ->fetch(PDO::FETCH_ASSOC);
if( ! $rows)
{
die('Empty Records');
}
$sqlQuery= "SELECT * FROM db_user WHERE email= ? AND password= ?";
$statement = $this->_dbHandle->prepare($sqlQuery); // prepare a PDO
// pass parameter to tackle [SQL Injection][1]
$stmt->execute(array($email, $password));
$result = $stmt->fetch();
if( $result ) {
echo "login true";
}else{
echo "login false";
}
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