How to perform MySQL transactions using PHP?
Jun 02, 2024 pm 02:17 PMExecuting MySQL transactions in PHP ensures data consistency and integrity. The steps include: Establishing a database connection Opening a transaction Executing a query Submitting the transaction (all queries succeed) Rolling back the transaction (any query fails) Practical case: In the shopping cart application, if any query fails, the transaction will be rolled back and the shopping cart and products will be undone. Changes to the table; if all queries succeed, the transaction is committed, saving the changes permanently.
#How to perform MySQL transactions using PHP?
A transaction is a series of operations in the database, either all of them are submitted successfully or all of them fail to be rolled back. Using transactions in PHP ensures data consistency and integrity.
Steps:
-
Establish a database connection: Use the
mysqli_connect()
function to establish a connection with the MySQL database . -
Start a transaction: Use the
mysqli_begin_transaction()
function to start a transaction. - Execute query: Execute all necessary queries. For example, updating a table or inserting data.
-
Commit transaction: If all queries are successful, use the
mysqli_commit()
function to commit the transaction. This will save the changes permanently. -
Rollback transaction: If any query fails, use the
mysqli_rollback()
function to roll back the transaction. This will undo all changes made within the transaction.
Practical Example:
Consider a simple shopping cart application where users add items to their shopping cart. The following code shows how to use transactions to achieve this functionality:
// 建立數(shù)據(jù)庫連接 $conn = new mysqli("localhost", "username", "password", "database"); if ($conn->connect_error) { die("連接失敗: " . $conn->connect_error); } // 開啟事務(wù) $conn->begin_transaction(); // 插入新項目到購物車表中 $sql = "INSERT INTO cart (product_id, user_id, quantity) VALUES (?, ?, ?)"; $stmt = $conn->prepare($sql); $stmt->bind_param("iii", $productId, $userId, $quantity); $stmt->execute(); // 更新產(chǎn)品表中的庫存 $sql = "UPDATE products SET stock = stock - ? WHERE product_id = ?"; $stmt = $conn->prepare($sql); $stmt->bind_param("ii", $quantity, $productId); $stmt->execute(); // 檢查是否有任何查詢失敗 if ($stmt->error) { // 回滾事務(wù) $conn->rollback(); echo "添加商品到購物車失敗!"; exit(); } // 提交事務(wù) $conn->commit(); echo "商品已成功添加到購物車!";
In the above example, if any query (inserting into the shopping cart table or updating the products table) fails, the transaction will be rolled back and the changes in the shopping cart will be will be undone. If all queries succeed, the transaction is committed and the changes to the shopping cart and product tables are persisted.
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