Question

我正在尝试构建一个API来从mySQL返回数据。这是我第一次使用PDO。

我正在尝试将ID传递给以下函数，以便从tblnames返回所有名称，其中tblcemetery_ID =传递给页面的内容。

我已经确认SQL本身就是声音..

任何指针都会受到赞赏。

结果总是说

{＆＃34;消息＆＃34;：＆＃34;未发现意外伤亡。＆＃34;}

<?php
class casualty{

    // database connection and table name
    private $conn;
    private $table_name = "tblcasualty";

    // object properties
    public $id;
    public $fldgraphicname;


    public function __construct($db){
        $this->conn = $db;
    }

    // used by select drop-down list
    public function cemetery(){            
        // query to read single record
                    $query = "SELECT *
                        FROM 
                        `mapleleaf`.`tblnames` 
                            WHERE
                        `tblcemetery_ID` = ?
                            ORDER BY ID
                         ";

        // prepare query statement
        $stmt = $this->conn->prepare( $query );

        // bind id of product to be updated
        $stmt->bindParam(1, $this->id);

        // execute query
        $stmt->execute();

            return $stmt;
    }         

}
?>
<?php
// required header
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");

// include database and object files
include_once '../config/database.php';
include_once '../objects/casualty.php';

// instantiate database and casualty object
$database = new Database();
$db = $database->getConnection();

// initialize object
$casualty = new casualty($db);

// set ID property of record to read
$casualty->id = isset($_GET['id']) ? $_GET['id'] : die();

// query categorys
$stmt = $casualty->cemetery();
$num = $stmt->rowCount();

// check if more than 0 record found
if($num>0){

    // products array
    $casualtys_arr=array();
    $casualtys_arr["records"]=array();

    // retrieve our table contents
    // fetch() is faster than fetchAll()
    // http://stackoverflow.com/questions/2770630/pdofetchall-vs-pdofetch-in-a-loop
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
        // extract row
        // this will make $row['name'] to
        // just $name only
        extract($row);

        $casualty_item=array(
            "ID" => $ID,
            "filename" => $fldgraphicname                    
        );

        array_push($casualtys_arr["records"], $casualty_item);
    }

    echo json_encode($casualtys_arr);
}

else{
    echo json_encode(
        array("message" => "No Casualties found.")
    );
}
?>

Answer 1

您bindParam函数缺少参数，因为您没有使用命名绑定。正确的是$stmt->bindParam(1, $this->id, PDO::PARAM_INT);。

文档链接： http://php.net/manual/en/pdostatement.bindparam.php

PDO - 将ID传递给函数的代码错误

1 个答案: