


How to Retrieve and Use the Last Inserted ID for Cross-Table Inserts in PHP?
Dec 02, 2024 am 06:56 AMRetrieving and Using Last Row ID for Cross-Table Insert in PHP
When performing multiple inserts across different tables, it becomes necessary to retrieve the last inserted ID from one table to use as a reference in subsequent inserts. In PHP, using the mysqli extension, this task requires a bit of understanding.
In your provided code, you attempted to directly bind the result of $mysqli->insert_id to the image field in your table1 insert statement. However, this approach is incorrect as the last inserted ID should be obtained from the previous insert statement.
To correctly retrieve and use the last inserted ID, you must first ensure that your table has an auto-incrementing field, typically named id. This field keeps track of the next available integer value to use as the primary key for new records.
Once you have an auto-incrementing field, you can use the mysqli_insert_id($conn) function to retrieve the ID of the last inserted row. Here's an example:
$username = 'user1'; $fname = 'John'; $lname = 'Doe'; // Insert into table2 $insert = "INSERT INTO table2 (username) VALUES (?)"; if ($stmt = $mysqli->prepare($insert)) { $stmt->bind_param('s', $username); $stmt->execute(); } // Retrieve last inserted ID for image $last_id = mysqli_insert_id($conn); // Insert into table1 $insert = "INSERT INTO table1 (username, firstname, lastname, image) VALUES (?, ?, ?, $last_id)"; if ($stmt = $mysqli->prepare($insert)) { $stmt->bind_param('sss', $username, $fname, $lname); $stmt->execute(); }
In this corrected code, we first insert a record into table2, and then we retrieve the last inserted ID using mysqli_insert_id($conn). This ID is then used as the image field in the subsequent insert statement into table1.
The above is the detailed content of How to Retrieve and Use the Last Inserted ID for Cross-Table Inserts in PHP?. For more information, please follow other related articles on the PHP Chinese website!

Hot Article

Hot tools Tags

Hot Article

Hot Article Tags

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

11 Best PHP URL Shortener Scripts (Free and Premium)

Working with Flash Session Data in Laravel

Build a React App With a Laravel Back End: Part 2, React

Simplified HTTP Response Mocking in Laravel Tests

cURL in PHP: How to Use the PHP cURL Extension in REST APIs

12 Best PHP Chat Scripts on CodeCanyon

Announcement of 2025 PHP Situation Survey
