{"id":3983,"date":"2024-07-17T07:49:52","date_gmt":"2024-07-17T00:49:52","guid":{"rendered":"https:\/\/www.sqlservertutorial.net\/?page_id=3983"},"modified":"2024-07-22T07:54:29","modified_gmt":"2024-07-22T00:54:29","slug":"nodejs-sql-server-transaction","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/nodejs-sql-server\/nodejs-sql-server-transaction\/","title":{"rendered":"Node.js SQL Server: Transaction"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to perform an SQL Server transaction using a Node.js application.<\/p>\n\n\n\n<p class=\"note\">This tutorial begins where\u00a0the\u00a0<a href=\"https:\/\/www.sqlservertutorial.net\/nodejs-sql-server\/nodejs-sql-server-delete\/\">Deleting data from a table using Node.js tutorial<\/a>\u00a0left off.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='setting-up-sample-data'>Setting up sample data <a href=\"#setting-up-sample-data\" class=\"anchor\" id=\"setting-up-sample-data\" title=\"Anchor for Setting up sample data\">#<\/a><\/h2>\n\n\n\n<p>Step 1. Launch SQL Server Management Studio (SSMS) to connect to the <code>BookStore<\/code> database.<\/p>\n\n\n\n<p>Step 2. Execute the following statements to insert data into the <code>Books<\/code>, <code>BookAuthors<\/code>, <code>Customers<\/code>, and <code>Inventories<\/code> tables:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-comment\">-- Insert books into the Books table<\/span>\n<span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> Books (Title, Publisher, ISBN, PublishedDate)\n<span class=\"hljs-keyword\">VALUES<\/span> (<span class=\"hljs-string\">'The Adventures of Tom Sawyer'<\/span>, <span class=\"hljs-string\">'American Publishing Company'<\/span>, <span class=\"hljs-string\">'978-0-123456-47-2'<\/span>, <span class=\"hljs-string\">'1876-01-01'<\/span>),\n       (<span class=\"hljs-string\">'The Adventures of Huckleberry Finn'<\/span>, <span class=\"hljs-string\">'Chatto &amp; Windus'<\/span>, <span class=\"hljs-string\">'978-0-123456-48-9'<\/span>, <span class=\"hljs-string\">'1884-12-10'<\/span>),\n       (<span class=\"hljs-string\">'A Connecticut Yankee in King Arthur''s Court'<\/span>, <span class=\"hljs-string\">'Charles L. Webster And Company'<\/span>, <span class=\"hljs-string\">'978-0-123456-49-6'<\/span>, <span class=\"hljs-string\">'1889-04-10'<\/span>),\n       (<span class=\"hljs-string\">'The Prince and the Pauper'<\/span>, <span class=\"hljs-string\">'James R. Osgood &amp; Co.'<\/span>, <span class=\"hljs-string\">'978-0-123456-50-2'<\/span>, <span class=\"hljs-string\">'1881-12-01'<\/span>),\n       (<span class=\"hljs-string\">'Life on the Mississippi'<\/span>, <span class=\"hljs-string\">'James R. Osgood &amp; Co.'<\/span>, <span class=\"hljs-string\">'978-0-123456-51-9'<\/span>, <span class=\"hljs-string\">'1883-02-01'<\/span>);\n\n<span class=\"hljs-comment\">-- Get the generated BookID values for the inserted books<\/span>\n<span class=\"hljs-keyword\">DECLARE<\/span> @BookID1 <span class=\"hljs-built_in\">INT<\/span>, @BookID2 <span class=\"hljs-built_in\">INT<\/span>, @BookID3 <span class=\"hljs-built_in\">INT<\/span>, @BookID4 <span class=\"hljs-built_in\">INT<\/span>, @BookID5 <span class=\"hljs-built_in\">INT<\/span>;\n\n<span class=\"hljs-keyword\">SELECT<\/span> @BookID1 = BookID <span class=\"hljs-keyword\">FROM<\/span> Books <span class=\"hljs-keyword\">WHERE<\/span> ISBN = <span class=\"hljs-string\">'978-0-123456-47-2'<\/span>;\n<span class=\"hljs-keyword\">SELECT<\/span> @BookID2 = BookID <span class=\"hljs-keyword\">FROM<\/span> Books <span class=\"hljs-keyword\">WHERE<\/span> ISBN = <span class=\"hljs-string\">'978-0-123456-48-9'<\/span>;\n<span class=\"hljs-keyword\">SELECT<\/span> @BookID3 = BookID <span class=\"hljs-keyword\">FROM<\/span> Books <span class=\"hljs-keyword\">WHERE<\/span> ISBN = <span class=\"hljs-string\">'978-0-123456-49-6'<\/span>;\n<span class=\"hljs-keyword\">SELECT<\/span> @BookID4 = BookID <span class=\"hljs-keyword\">FROM<\/span> Books <span class=\"hljs-keyword\">WHERE<\/span> ISBN = <span class=\"hljs-string\">'978-0-123456-50-2'<\/span>;\n<span class=\"hljs-keyword\">SELECT<\/span> @BookID5 = BookID <span class=\"hljs-keyword\">FROM<\/span> Books <span class=\"hljs-keyword\">WHERE<\/span> ISBN = <span class=\"hljs-string\">'978-0-123456-51-9'<\/span>;\n\n<span class=\"hljs-comment\">-- Insert records into the BookAuthors table<\/span>\n<span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> BookAuthors (BookID, AuthorID)\n<span class=\"hljs-keyword\">VALUES<\/span> (@BookID1, <span class=\"hljs-number\">6<\/span>),\n       (@BookID2, <span class=\"hljs-number\">6<\/span>),\n       (@BookID3, <span class=\"hljs-number\">6<\/span>),\n       (@BookID4, <span class=\"hljs-number\">6<\/span>),\n       (@BookID5, <span class=\"hljs-number\">6<\/span>);\n\n\n<span class=\"hljs-comment\">-- Insert inventories<\/span>\n<span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> Inventories (BookID, Qty)\n<span class=\"hljs-keyword\">SELECT<\/span> BookID, <span class=\"hljs-keyword\">ABS<\/span>(<span class=\"hljs-keyword\">CHECKSUM<\/span>(NEWID()) % <span class=\"hljs-number\">101<\/span>) + <span class=\"hljs-number\">100<\/span>\n<span class=\"hljs-keyword\">FROM<\/span> Books;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='perform-a-transaction'>Perform a transaction <a href=\"#perform-a-transaction\" class=\"anchor\" id=\"perform-a-transaction\" title=\"Anchor for Perform a transaction\">#<\/a><\/h2>\n\n\n\n<p>Step 1. Create a new file called <code>transaction.js<\/code> within the project directory.<\/p>\n\n\n\n<p>Step 2. Define a function <code>createOrder<\/code> in the <code>transaction.js<\/code> module that does the following steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check the inventory against the order quantity in the <code>Inventories<\/code> table.<\/li>\n\n\n\n<li>Create an order by inserting data into the <code>Orders<\/code> and <code>OrderDetails<\/code> table.<\/li>\n\n\n\n<li>Reduce the inventory of the book in the <code>Inventories<\/code> table.<\/li>\n<\/ul>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">import<\/span> sql <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'mssql'<\/span>;\n<span class=\"hljs-keyword\">import<\/span> { config } <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'.\/config.js'<\/span>;\n\n<span class=\"hljs-keyword\">async<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">createOrder<\/span>(<span class=\"hljs-params\">customerId, bookId, quantity, price, orderDate<\/span>) <\/span>{\n  <span class=\"hljs-keyword\">try<\/span> {\n    <span class=\"hljs-comment\">\/\/ Connect to the database<\/span>\n    <span class=\"hljs-keyword\">const<\/span> pool = <span class=\"hljs-keyword\">await<\/span> sql.connect(config);\n\n    <span class=\"hljs-comment\">\/\/ Begin transaction<\/span>\n    <span class=\"hljs-keyword\">const<\/span> transaction = <span class=\"hljs-keyword\">new<\/span> sql.Transaction(pool);\n    <span class=\"hljs-keyword\">await<\/span> transaction.begin();\n\n    <span class=\"hljs-keyword\">try<\/span> {\n      <span class=\"hljs-comment\">\/\/ Check inventory<\/span>\n      <span class=\"hljs-keyword\">const<\/span> inventoryResult = <span class=\"hljs-keyword\">await<\/span> transaction\n        .request()\n        .input(<span class=\"hljs-string\">'BookID'<\/span>, sql.Int, bookId).query(<span class=\"hljs-string\">`\n          SELECT Qty\n          FROM Inventories\n          WHERE BookID = @BookID\n        `<\/span>);\n\n      <span class=\"hljs-keyword\">const<\/span> currentQty = inventoryResult.recordset&#91;<span class=\"hljs-number\">0<\/span>]?.Qty;\n\n      <span class=\"hljs-keyword\">if<\/span> (!currentQty || currentQty &lt; quantity) {\n        <span class=\"hljs-keyword\">throw<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Error<\/span>(<span class=\"hljs-string\">'Not enough inventory to fulfill the order'<\/span>);\n      }\n\n      <span class=\"hljs-comment\">\/\/ Insert into Orders table<\/span>\n      <span class=\"hljs-keyword\">const<\/span> orderResult = <span class=\"hljs-keyword\">await<\/span> transaction\n        .request()\n        .input(<span class=\"hljs-string\">'CustomerID'<\/span>, sql.Int, customerId)\n        .input(<span class=\"hljs-string\">'OrderDate'<\/span>, sql.DateTime, orderDate)\n        .input(<span class=\"hljs-string\">'TotalAmount'<\/span>, sql.Decimal(<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">2<\/span>), price * quantity).query(<span class=\"hljs-string\">`\n          INSERT INTO Orders (CustomerID, OrderDate, TotalAmount)\n          OUTPUT INSERTED.OrderID\n          VALUES (@CustomerID, @OrderDate, @TotalAmount)\n        `<\/span>);\n\n      <span class=\"hljs-keyword\">const<\/span> orderId = orderResult.recordset&#91;<span class=\"hljs-number\">0<\/span>].OrderID;\n\n      <span class=\"hljs-comment\">\/\/ Insert into OrderDetails table<\/span>\n      <span class=\"hljs-keyword\">await<\/span> transaction\n        .request()\n        .input(<span class=\"hljs-string\">'OrderID'<\/span>, sql.Int, orderId)\n        .input(<span class=\"hljs-string\">'BookID'<\/span>, sql.Int, bookId)\n        .input(<span class=\"hljs-string\">'Quantity'<\/span>, sql.Int, quantity)\n        .input(<span class=\"hljs-string\">'Price'<\/span>, sql.Decimal(<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">2<\/span>), price).query(<span class=\"hljs-string\">`\n          INSERT INTO OrderDetails (OrderID, BookID, Quantity, Price)\n          VALUES (@OrderID, @BookID, @Quantity, @Price)\n        `<\/span>);\n\n      <span class=\"hljs-comment\">\/\/ Update Inventories table<\/span>\n      <span class=\"hljs-keyword\">await<\/span> transaction\n        .request()\n        .input(<span class=\"hljs-string\">'BookID'<\/span>, sql.Int, bookId)\n        .input(<span class=\"hljs-string\">'Quantity'<\/span>, sql.Int, quantity).query(<span class=\"hljs-string\">`\n          UPDATE Inventories\n          SET Qty = Qty - @Quantity\n          WHERE BookID = @BookID\n        `<\/span>);\n\n      <span class=\"hljs-comment\">\/\/ Commit transaction<\/span>\n      <span class=\"hljs-keyword\">await<\/span> transaction.commit();\n      <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'Order created successfully'<\/span>);\n    } <span class=\"hljs-keyword\">catch<\/span> (err) {\n      <span class=\"hljs-comment\">\/\/ Rollback transaction on error<\/span>\n      <span class=\"hljs-keyword\">await<\/span> transaction.rollback();\n      <span class=\"hljs-keyword\">throw<\/span> err;\n    }\n  } <span class=\"hljs-keyword\">catch<\/span> (err) {\n    <span class=\"hljs-built_in\">console<\/span>.error(<span class=\"hljs-string\">'Error creating order:'<\/span>, err);\n  }\n}\n\n<span class=\"hljs-keyword\">export<\/span> { createOrder };<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>First, import <code>sql<\/code> object from <code>mssql<\/code> package and <code>config<\/code> object from the <code>config.js<\/code> module:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">import<\/span> sql <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'mssql'<\/span>;\n<span class=\"hljs-keyword\">import<\/span> { config } <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'.\/config.js'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, define a function <code>createOrder()<\/code> that creates an order for a customer based on the ordered book specified by book id, quantity of books, price, and order date.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">async<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">createOrder<\/span>(<span class=\"hljs-params\">customerId, bookId, quantity, price, orderDate<\/span>) <\/span>{\n    <span class=\"hljs-comment\">\/\/...<\/span>\n};<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, connect to the database using the provided configuration object:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> pool = <span class=\"hljs-keyword\">await<\/span> sql.connect(config);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fourth, begin a transaction by creating a new <code>Transaction<\/code> object and calling the <code>begin()<\/code> method.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> transaction = <span class=\"hljs-keyword\">new<\/span> sql.Transaction(pool);\n<span class=\"hljs-keyword\">await<\/span> transaction.begin();<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fifth, check the inventory by the book ID and return the inventory quantity of the book:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> inventoryResult = <span class=\"hljs-keyword\">await<\/span> transaction\n  .request()\n  .input(<span class=\"hljs-string\">'BookID'<\/span>, sql.Int, bookId).query(<span class=\"hljs-string\">`\n          SELECT Qty\n          FROM Inventories\n          WHERE BookID = @BookID\n        `<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Sixth, if the inventory quantity is less than the order quantity, then issue an error:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> currentQty = inventoryResult.recordset&#91;<span class=\"hljs-number\">0<\/span>]?.Qty;\n\n<span class=\"hljs-keyword\">if<\/span> (!currentQty || currentQty &lt; quantity) {\n  <span class=\"hljs-keyword\">throw<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Error<\/span>(<span class=\"hljs-string\">'Not enough inventory to fulfill the order'<\/span>);\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Seventh, insert a new row into the <code>Orders<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> orderResult = <span class=\"hljs-keyword\">await<\/span> transaction\n  .request()\n  .input(<span class=\"hljs-string\">'CustomerID'<\/span>, sql.Int, customerId)\n  .input(<span class=\"hljs-string\">'OrderDate'<\/span>, sql.DateTime, orderDate)\n  .input(<span class=\"hljs-string\">'TotalAmount'<\/span>, sql.Decimal(<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">2<\/span>), price * quantity).query(<span class=\"hljs-string\">`\n          INSERT INTO Orders (CustomerID, OrderDate, TotalAmount)\n          OUTPUT INSERTED.OrderID\n          VALUES (@CustomerID, @OrderDate, @TotalAmount)\n        `<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Eighth, get the inserted order ID:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> orderId = orderResult.recordset&#91;<span class=\"hljs-number\">0<\/span>].OrderID;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Ninth, insert a new row into the <code>OrderDetails<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">await<\/span> transaction\n  .request()\n  .input(<span class=\"hljs-string\">'OrderID'<\/span>, sql.Int, orderId)\n  .input(<span class=\"hljs-string\">'BookID'<\/span>, sql.Int, bookId)\n  .input(<span class=\"hljs-string\">'Quantity'<\/span>, sql.Int, quantity)\n  .input(<span class=\"hljs-string\">'Price'<\/span>, sql.Decimal(<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">2<\/span>), price).query(<span class=\"hljs-string\">`\n          INSERT INTO OrderDetails (OrderID, BookID, Quantity, Price)\n          VALUES (@OrderID, @BookID, @Quantity, @Price)\n        `<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Tenth, update the <code>Inventories<\/code> table by reducing the inventory quantity by the quantity ordered:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">await<\/span> transaction\n  .request()\n  .input(<span class=\"hljs-string\">'BookID'<\/span>, sql.Int, bookId)\n  .input(<span class=\"hljs-string\">'Quantity'<\/span>, sql.Int, quantity).query(<span class=\"hljs-string\">`\n          UPDATE Inventories\n          SET Qty = Qty - @Quantity\n          WHERE BookID = @BookID\n        `<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Eleventh, commit the transaction by calling the <code>commit()<\/code> method of the transaction object:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">await<\/span> transaction.commit();<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Twelveth, if any error occurs during the transaction, roll it back by calling the <code>rollback()<\/code> method of the <code>Transaction<\/code> object:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-14\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">await<\/span> transaction.rollback();<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Additionally, throw an error:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-15\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">throw<\/span> err;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-15\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Step 3. Modify the <code>index.js<\/code> file to use the <code>createOrder<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-16\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">import<\/span> { createOrder } <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'.\/transaction.js'<\/span>;\n\n<span class=\"hljs-keyword\">try<\/span> {\n  <span class=\"hljs-keyword\">await<\/span> createOrder(<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">5<\/span>, <span class=\"hljs-number\">9.99<\/span>, <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Date<\/span>(<span class=\"hljs-number\">2024<\/span>, <span class=\"hljs-number\">6<\/span>, <span class=\"hljs-number\">16<\/span>));\n} <span class=\"hljs-keyword\">catch<\/span> (err) {\n  <span class=\"hljs-built_in\">console<\/span>.log(err);\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-16\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>First, import the <code>createOrder<\/code> function from the <code>transaction.js<\/code> module:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-17\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">import<\/span> { createOrder } <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'.\/transaction.js'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-17\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, create a new order by calling the <code>createOrder<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-18\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">try<\/span> {\n  <span class=\"hljs-keyword\">await<\/span> createOrder(<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">500<\/span>, <span class=\"hljs-number\">9.99<\/span>, <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Date<\/span>(<span class=\"hljs-number\">2024<\/span>, <span class=\"hljs-number\">6<\/span>, <span class=\"hljs-number\">16<\/span>));\n} <span class=\"hljs-keyword\">catch<\/span> (err) {\n  <span class=\"hljs-built_in\">console<\/span>.log(err);\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-18\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Step 4. Open your terminal and run the following command to execute the <code>index.js<\/code> file:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-19\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">npm start<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-19\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='download-the-project-source-code'>Download the project source code <a href=\"#download-the-project-source-code\" class=\"anchor\" id=\"download-the-project-source-code\" title=\"Anchor for Download the project source code\">#<\/a><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/Node.js-SQL-Server-Transaction.zip\">Download the project source code<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Call <code>transaction.begin()<\/code> method to start a transaction.<\/li>\n\n\n\n<li>Commit a transaction by calling the <code>transaction.commit()<\/code> method to commit a transaction.<\/li>\n\n\n\n<li>Rollback a transaction by calling the <code>transaction.rollback()<\/code> method to roll back a transaction.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful?<\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"3983\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlservertutorial.net\/nodejs-sql-server\/nodejs-sql-server-transaction\/\"\n\t\t\t\tdata-post-title=\"Node.js SQL Server: Transaction\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t\tclass=\"feather feather-thumbs-up block w-full h-full\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 0 0 0-2-2.3zM7 22H4a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2h3\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> Yes <\/span>\n\t\t\t<\/button>\n\n\t\t\t<button\n\t\t\t\tdata-response=\"0\"\n\t\t\t\tdata-post=\"3983\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlservertutorial.net\/nodejs-sql-server\/nodejs-sql-server-transaction\/\"\n\t\t\t\tdata-post-title=\"Node.js SQL Server: Transaction\"\n\t\t\t\tclass=\"wth-btn-rounded wth-no-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M10 15v4a3 3 0 0 0 3 3l4-9V2H5.72a2 2 0 0 0-2 1.7l-1.38 9a2 2 0 0 0 2 2.3zm7-13h2.67A2.31 2.31 0 0 1 22 4v7a2.31 2.31 0 0 1-2.33 2H17\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> No <\/span>\n\t\t\t<\/button>\n\t\t<\/div>\n\t<\/header>\n\n\t<div class=\"wth-form hidden\">\n\t\t<div class=\"wth-form-wrapper\">\n\t\t\t<div class=\"wth-title\"><\/div>\n\t\t\t\n\t\t\t<textarea class=\"wth-message\"><\/textarea>\n\n\t\t\t<button class=\"btn btn-primary wth-btn-submit\">Send<\/button>\n\t\t\t<button class=\"btn wth-btn-cancel\">Cancel<\/button>\n\t\t\n\t\t<\/div>\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summary: in this tutorial, you will learn how to perform an SQL Server transaction using a Node.js application. This tutorial begins where\u00a0the\u00a0Deleting data from a table using Node.js tutorial\u00a0left off. Setting up sample data # Step 1. Launch SQL Server Management Studio (SSMS) to connect to the BookStore database. Step 2. Execute the following statements [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3891,"menu_order":8,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3983","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Node.js SQL Server: Transaction<\/title>\n<meta name=\"description\" content=\"In this tutorial, you will learn how to perform an SQL Server transaction in a Node.js application.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sqlservertutorial.net\/nodejs-sql-server\/nodejs-sql-server-transaction\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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