如何在sql中使用php获取两个表中的特定用户的数据使用php

Question

从两个表中获取数据已经在工作，但我不知道如何从两个表中获取用户的特定数据。我不知道在哪里可以把这个代码//其中seller_id =“）;

这里是我的代码 '[seller_id '$ _SESSION。'“'：

<?php 
$seller_id = $_SESSION['seller_id']; 
$user_query = mysqli_query($db, "SELECT seller.s_fname, seller.s_lname, seller.trade_name, seller.s_address, selling_details.opening_time, selling_details.opening_days, selling_details.order_cutoff, selling_details.seller_delivery_time, selling_details.area_covered_delivery, selling_details.delivery_fee FROM seller INNER JOIN selling_details ON seller.seller_id=selling_details.seller_id 
WHERE seller.seller_id=selling_details.seller_id"); 
$seller = mysqli_fetch_assoc($user_query); 
?> 

Answer 1

由于需要嵌入一​​些参数为查询，我们将使用prepared statements防止SQL injection攻击。

// Get seller ID 
$seller_id = $_SESSION['seller_id']; 

// Prepare the query that will be executed 
$stmt = $db->prepare("SELECT seller.s_fname AS s_fname, seller.s_lname AS s_lname, seller.trade_name AS trade_name, seller.s_address AS s_address, selling_details.opening_time AS opening_time, selling_details.opening_days AS opening_days, selling_details.order_cutoff AS order_cutoff, selling_details.seller_delivery_time AS seller_delivery_time, selling_details.area_covered_delivery AS area_covered_delivery, selling_details.delivery_fee AS delivery_fee FROM seller INNER JOIN selling_details ON seller.seller_id=selling_details.seller_id WHERE seller.seller_id = ?"); 

// Instead of that '?', put the $seller_id 
$stmt->bind_param('i', $seller_id); 

// Execute the statement. 
$stmt->execute(); 

// Get the results. 
$result = $stmt->get_result(); 

// For each row, get it's associative array representation. 
while ($row = mysqli_fetch_assoc($result)) { 
    // Echo first and last name. 
    echo $row['s_fname'].' '.$row['s_lname'].'<br/>'; 
} 

// Close the statement. 
$stmt->close(); 

Answer 2

<?php 
$seller_id = $_SESSION['seller_id']; 
$user_query = mysqli_query($db, "SELECT seller.s_fname, seller.s_lname, seller.trade_name, seller.s_address, selling_details.opening_time, selling_details.opening_days, selling_details.order_cutoff, selling_details.seller_delivery_time, selling_details.area_covered_delivery, selling_details.delivery_fee FROM seller INNER JOIN selling_details ON seller.seller_id=selling_details.seller_id 
WHERE seller.id=$seller_id"); 
$seller = mysqli_fetch_assoc($user_query); 
?>