使用帶有類的PDO從數據庫中獲取數據

Question

為什么只顯示第一組數據而不顯示全部數據？

這是我的代碼。（對不起，OOP還是新手）

include 'crud.php';

$db_host = "localhost";
$db_name = "crud";
$db_username = "root";
$db_password = "";

$conn = new PDO("mysql:host=$db_host;dbname=$db_name", $db_username, $db_password);


$select = new Crud($conn);
$select->crud_select();

crud.php

class Crud
{
    private $conn;
    public function __construct($conn){
        $this->conn = $conn;
    }
    public function crud_insert($lname, $fname, $address, $age){

    }
    public function crud_select(){
        $result = $this->conn->prepare("SELECT * FROM personal_info");
        $result->execute();
        $count = $result->rowCount();
        if($count == 0){
            $no_files = "No file(s) found!";
            echo $no_files;
        }
        else{
            $row = $result->fetch();
            echo $row['last_name'] . "<br/>";
            echo $row['first_name'] . "<br/>";
            echo $row['address'] . "<br/>";
            echo $row['age'] . "<br/>";
        }   
    }
}

如果我正在嘗試fetchAll()則不會顯示任何內容。

Answer 1

您應該將獲取放置在while循環中以獲取所有結果

while($row = $result->fetch())
{
            echo $row['last_name'] . "<br/>";
            echo $row['first_name'] . "<br/>";
            echo $row['address'] . "<br/>";
            echo $row['age'] . "<br/>";
}

Answer 2

因為您只能提取一行。 如果要獲取多行，則需要循環

        $result->execute();

        $count = $result->rowCount();
        $result->setFetchMode(PDO::FETCH_ASSOC);
        if($count == 0){
            $no_files = "No file(s) found!";
            echo $no_files;
        }

  else{
    while($row = $result->fetch()){
                echo $row['last_name'] . "<br/>";
                echo $row['first_name'] . "<br/>";
                echo $row['address'] . "<br/>";
                echo $row['age'] . "<br/>";     
     }
    }

或者您可以像這樣獲取數組：

        $result->execute();        
        $count = $result->rowCount();

        if($count == 0){
            $no_files = "No file(s) found!";
            echo $no_files;
        }

  else{

        $resultset = $datas->fetchALL(PDO::FETCH_ASSOC);
        foreach($resultset as $row){
                    echo $row['last_name'] . "<br/>";
                    echo $row['first_name'] . "<br/>";
                    echo $row['address'] . "<br/>";
                    echo $row['age'] . "<br/>";     
         }
        }