Code generation for inventory correction function in PHP inventory management system

Code generation for the inventory correction function in the PHP inventory management system

In the inventory management system, the inventory correction function is a very important link. It can help administrators adjust inventory quantities in a timely manner and ensure the accuracy of inventory data. This article will introduce how to use PHP to write an inventory revision code example.

Before we begin, we first need to create a database and create a table named "inventory". The form will contain fields such as product ID, product name, product quantity, etc. We can use the following SQL statement to create the table:

CREATE TABLE inventory (
    id INT(10) AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(100),
    quantity INT(10)
);

Next, we can use the following PHP code to implement the inventory correction function:

<?php
// 连接数据库
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 获取POST请求中的数据
$id = $_POST["id"];
$quantity = $_POST["quantity"];

// 检查输入的产品ID是否存在
$sql = "SELECT * FROM inventory WHERE id = ".$id;
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    $row = $result->fetch_assoc();
    $currentQuantity = $row["quantity"];
    
    // 更新库存数量
    $newQuantity = $currentQuantity + $quantity;
    
    // 执行更新语句
    $updateSql = "UPDATE inventory SET quantity = ".$newQuantity." WHERE id = ".$id;
    
    if ($conn->query($updateSql) === TRUE) {
        echo "库存订正成功";
    } else {
        echo "库存订正失败: " . $conn->error;
    }
} else {
    echo "产品ID不存在";
}

$conn->close();
?>

The above code first communicates with the database through the mysqli object Connected and obtained the product ID and revision quantity in the POST request. It then performs a SELECT query to check if the product exists in the database. If it exists, it will get the current inventory quantity and calculate the new inventory quantity. Finally, it will execute an UPDATE statement to update the inventory quantity.

It should be noted that the above code example is for demonstration purposes only. In actual applications, we should also add appropriate input validation and error handling mechanisms to ensure the security and stability of the system.

I hope this article can help everyone understand how to use PHP to write code for the inventory correction function. Through this example, we can better manage inventory and improve work efficiency. At the same time, you can also improve the code according to your own needs to make it more in line with the requirements of actual projects.

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