如何在PHP中使用for循环返回mysql数据

如何在PHP中使用for循环返回mysql数据,php,mysql,Php,Mysql,我正在制作一个应用程序,可以在列表视图中列出某个商店的员工。我的DB_Functions.php文件中的当前函数是: public function getEmployeeList($name) { $stmt = $this->con->prepare("SELECT employee_name FROM employees WHERE name = ?"); $stmt->bind_param('s', $name); if ($stmt->

我正在制作一个应用程序,可以在列表视图中列出某个商店的员工。我的DB_Functions.php文件中的当前函数是:

public function getEmployeeList($name) {
    $stmt = $this->con->prepare("SELECT employee_name FROM employees WHERE name = ?");

    $stmt->bind_param('s', $name);

    if ($stmt->execute()) {
        $employee_list = $stmt->get_result()->fetch_assoc();
        $stmt->close();

        if (empty($employee_list)) {
            return NULL;
        } else {
            return $employee_list;
        }
    }
}
在employees.php文件中,我有以下代码:

<?php

require_once 'include/DB_Functions.php';
$db = new DB_Functions();

$response = array('error' => FALSE);

if (isset($_POST['name'])) {
    $name = $_POST['name'];

    $employee_list = $db->getEmployeeList($name);

    if ($employee_list != false) {
        $response['error'] = FALSE;
        //EMPLOYEE LIST OBJECT HERE
    } else {
        $response['error'] = TRUE;
        $response['error_msg'] = 'No employees have been added to this profile.';

        echo json_encode($response);
    }
} else {
    $response['error'] = TRUE;
    $response['error_msg'] = 'You have not logged in to your store\'s account, please log in first.';

    echo json_encode($response);
}

?>
等等。。。等等


将JSONObject返回到android应用程序后,内容将在列表视图中列出。我需要一个for循环(我想),因为员工编号永远不会被知道,因为每个商店都可以根据自己的意愿添加和删除员工。是否有人能为我指出正确的方向,并建议我在代码的其余部分是否使用了正确的方法。谢谢。

首先,在DB_Functions.php中,您应该返回mysqli_result对象。 因此,您的DB_函数应该是:

public function getEmployeeList($name) {
    $stmt = $this->con->prepare("SELECT employee_name FROM employees WHERE name = ?");

    $stmt->bind_param('s', $name);

    if ($stmt->execute()) {
        // we get the mysqli_result object without calling the fetch_assoc() on it
        $result = $stmt->get_result();
        $stmt->close();

        // if the count is less than 1, no result found, hence return null
        if ($result->num_rows < 1) {
            return null;
        } else {
            // we return the mysqli_result object without calling the fetch_assoc() on it
            return $result;
        }
    }
}
公共函数getEmployeeList($name){
$stmt=$this->con->prepare(“从名称=?”的员工中选择员工的姓名”);
$stmt->bind_参数('s',$name);
如果($stmt->execute()){
//我们获取mysqli_result对象,而不调用其上的fetch_assoc()
$result=$stmt->get_result();
$stmt->close();
//如果计数小于1,则找不到结果,因此返回null
如果($result->num_rows<1){
返回null;
}否则{
//我们返回mysqli_result对象,而不对其调用fetch_assoc()
返回$result;
}
}
}
在employees.php中,您需要的是以下内容:

<?php

require_once 'include/DB_Functions.php';
$db = new DB_Functions();

$response = array('error' => FALSE);

if (isset($_POST['name'])) {
    $name = $_POST['name'];

    $result = $db->getEmployeeList($name);

    // do an early check for if result returns null or is not set
    if (is_null($result) || !$result) {
        $response['error'] = TRUE;
        $response['error_msg'] = 'No employees have been added to this profile.';
    } else {
        $response['error'] = FALSE;
        //EMPLOYEE LIST OBJECT HERE
        // since $result->fetch_assoc() returns one row at a time, you want to loop through each row and get the appropriate data
        while ($row = $result->fetch_assoc()) {
            // inject the current into the employee_list array
            $response['employee_list'][] = $row;
        }
    }
} else {
    $response['error'] = TRUE;
    $response['error_msg'] = 'You have not logged in to your store\'s account, please log in first.';
}

// echo response gets called no matter what
echo json_encode($response);

首先,在DB_Functions.php中,应该返回mysqli_结果对象。
因此,您的DB_函数应该是:

public function getEmployeeList($name) {
    $stmt = $this->con->prepare("SELECT employee_name FROM employees WHERE name = ?");

    $stmt->bind_param('s', $name);

    if ($stmt->execute()) {
        // we get the mysqli_result object without calling the fetch_assoc() on it
        $result = $stmt->get_result();
        $stmt->close();

        // if the count is less than 1, no result found, hence return null
        if ($result->num_rows < 1) {
            return null;
        } else {
            // we return the mysqli_result object without calling the fetch_assoc() on it
            return $result;
        }
    }
}
公共函数getEmployeeList($name){
$stmt=$this->con->prepare(“从名称=?”的员工中选择员工的姓名”);
$stmt->bind_参数('s',$name);
如果($stmt->execute()){
//我们获取mysqli_result对象,而不调用其上的fetch_assoc()
$result=$stmt->get_result();
$stmt->close();
//如果计数小于1,则找不到结果,因此返回null
如果($result->num_rows<1){
返回null;
}否则{
//我们返回mysqli_result对象,而不对其调用fetch_assoc()
返回$result;
}
}
}
在employees.php中,您需要的是以下内容:

<?php

require_once 'include/DB_Functions.php';
$db = new DB_Functions();

$response = array('error' => FALSE);

if (isset($_POST['name'])) {
    $name = $_POST['name'];

    $result = $db->getEmployeeList($name);

    // do an early check for if result returns null or is not set
    if (is_null($result) || !$result) {
        $response['error'] = TRUE;
        $response['error_msg'] = 'No employees have been added to this profile.';
    } else {
        $response['error'] = FALSE;
        //EMPLOYEE LIST OBJECT HERE
        // since $result->fetch_assoc() returns one row at a time, you want to loop through each row and get the appropriate data
        while ($row = $result->fetch_assoc()) {
            // inject the current into the employee_list array
            $response['employee_list'][] = $row;
        }
    }
} else {
    $response['error'] = TRUE;
    $response['error_msg'] = 'You have not logged in to your store\'s account, please log in first.';
}

// echo response gets called no matter what
echo json_encode($response);

非常感谢您+1.我设法将结果输入到应用程序中,我可以在日志中看到如下内容:{“error”:false,“employee_list”:[{“employee_name”:“Jason Matthews”},{“employee_name”:“Tori Wilson”}}}现在,我只需要弄清楚如何将所有这些内容放入可选择的列表中。非常感谢你的帮助。非常感谢+1.我设法将结果输入到应用程序中,我可以在日志中看到如下内容:{“error”:false,“employee_list”:[{“employee_name”:“Jason Matthews”},{“employee_name”:“Tori Wilson”}}}现在,我只需要弄清楚如何将所有这些内容放入可选择的列表中。非常感谢你的帮助。