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class="see-all-button cta-btn bg-black text-white">See All Results</button> </div> <div class="hero-wrapper"> <div class="hero-posts"> <div id="post-13499" class="with-featured-image hero-post post-13499 post type-post status-publish format-standard has-post-thumbnail hentry category-dotnet category-couchbase-sdk category-couchbase-server tag-asp-net tag-asp-net-core tag-asp-net-crud tag-asp-net-crud-nosql tag-c tag-capella tag-dbaas">  <div class="site-header-bg-wrap"> <div class="header-opacity"> <div class="header-gradient"></div> <div class="site-header-bg background-effect" style="background-image: url(https://www.couchbase.com/blog/wp-content/uploads/sites/1/2021/12/hannah-wei-aso6SYJZGps-unsplash-scaled.jpg); opacity: 0.5;"></div> </div> </div> <div class="container hero-container">  <div class="hero-text"> <h1 class="entry-title">ASP.NET Core CRUD with NoSQL: Part 4</h1> <div class="hero-date"> <ul> <li>  <a class="author-profile-avatar" href="https://www.couchbase.com/blog/author/matthew-groves/" title="Posts by Matthew Groves"> <img alt='' src='https://secure.gravatar.com/avatar/ca7f815e5cfadc140b5a78814865a920?s=65&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/ca7f815e5cfadc140b5a78814865a920?s=130&d=mm&r=g 2x' class='avatar avatar-65 photo' height='65' width='65' decoding='async'/> </a> </li> <li> <div class="auth_detail_wrp">  <a class="auth_name" href="https://www.couchbase.com/blog/author/matthew-groves/"> Matthew Groves </a> </div> <div class="date_blog"> <span class="hero-date-span">June 28, 2022</span> </div> </li> </ul> </div> </div> </div> </div> </div> </div> <div id="page" class="hfeed site container"> <div id="content" class="site-content"> <div id="primary" class="content-area"> <main id="main" class="site-main" role="main"> <article id="post-13499" class="post full-post post-13499 type-post status-publish format-standard has-post-thumbnail hentry category-dotnet category-couchbase-sdk category-couchbase-server tag-asp-net tag-asp-net-core tag-asp-net-crud tag-asp-net-crud-nosql tag-c tag-capella tag-dbaas"> <div class="entry-content"> <p><span style="font-weight: 400;">ASP.NET CRUD apps include interaction with data that consists of create, read, update, and delete. In </span><a href="https://www.couchbase.com/blog/asp-net-core-crud-with-nosql-part-1/"><span style="font-weight: 400;">part 1</span></a><span style="font-weight: 400;">, we setup a basic ASP.NET Core project. In </span><a href="https://www.couchbase.com/blog/asp-net-crud-nosql-part-2/" target="_blank" rel="noopener"><span style="font-weight: 400;">part 2</span></a><span style="font-weight: 400;">, we added the first </span><i><span style="font-weight: 400;">read</span></i><span style="font-weight: 400;"> endpoint, using a SQL++ query against wishlist data. In </span><a href="https://www.couchbase.com/blog/asp-net-core-crud-nosql-part-3/" target="_blank" rel="noopener"><span style="font-weight: 400;">part 3</span></a><span style="font-weight: 400;">, we added another read endpoint, this time using the key-value API.</span></p> <p><span style="font-weight: 400;">Until this point, the only data modifications we’ve made have been directly in the Couchbase Capella UI. In this post, let’s add an endpoint to handle creating and updating wishlist data.</span></p> <h2><b>SQL++ vs Key-Value: Revisited</b></h2> <p><span style="font-weight: 400;">SQL++ includes </span><em><span style="font-weight: 400;">INSERT</span><span style="font-weight: 400;">, </span><span style="font-weight: 400;">UPDATE</span><span style="font-weight: 400;">, </span><span style="font-weight: 400;">DELETE</span></em><span style="font-weight: 400;"> syntax. So, we could use SQL++ to build an endpoint for mutating data. It would be very similar to the code written in </span><a href="https://www.couchbase.com/blog/asp-net-crud-nosql-part-2/"><span style="font-weight: 400;">part 2</span></a><span style="font-weight: 400;">.</span></p> <p><span style="font-weight: 400;">One keyword in SQL++ that you might not have seen before is </span><em><span style="font-weight: 400;">UPSERT</span></em><span style="font-weight: 400;">. As you might guess, it’s a combination of </span><em><span style="font-weight: 400;">UPDATE</span></em><span style="font-weight: 400;"> and </span><em><span style="font-weight: 400;">INSERT</span></em><span style="font-weight: 400;"><em>.</em> An update will happen if the data already exists; an insert will happen if it doesn’t. Here’s how an upsert endpoint using SQL++ might look:</span></p> <div id="urvanov-syntax-highlighter-6742b7a97fae6374154122" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> [HttpPost] [Route("api/editWithSql")] public async Task<IActionResult> CreateOrEditWithSql(WishlistItem item) { var bucket = await _bucketProvider.GetBucketAsync("demo"); var cluster = bucket.Cluster; var id = item.Id ?? Guid.NewGuid(); var result = await cluster.QueryAsync<WishlistItem>( @"UPSERT INTO demo._default.wishlist (KEY, VALUE) VALUES ($id, { ""name"" : $name });", options => options .Parameter("id", id) .Parameter("name", item.Name) ); return Ok(result); }</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-1">1</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-2">2</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-3">3</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-4">4</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-5">5</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-6">6</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-7">7</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-8">8</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-9">9</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-10">10</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-11">11</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-12">12</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-13">13</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-14">14</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-15">15</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-16">16</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-17">17</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-18">18</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97fae6374154122-19">19</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-1"><span class="crayon-sy">[</span><span class="crayon-v">HttpPost</span><span class="crayon-sy">]</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-2"><span class="crayon-sy">[</span><span class="crayon-e">Route</span><span class="crayon-sy">(</span><span class="crayon-s">"api/editWithSql"</span><span class="crayon-sy">)</span><span class="crayon-sy">]</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-3"><span class="crayon-m">public</span><span class="crayon-h"> </span><span class="crayon-e">async </span><span class="crayon-v">Task</span><span class="crayon-o"><</span><span class="crayon-v">IActionResult</span><span class="crayon-o">></span><span class="crayon-h"> </span><span class="crayon-e">CreateOrEditWithSql</span><span class="crayon-sy">(</span><span class="crayon-e">WishlistItem </span><span class="crayon-v">item</span><span class="crayon-sy">)</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-4"><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-5"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">bucket</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">await </span><span class="crayon-v">_bucketProvider</span><span class="crayon-sy">.</span><span class="crayon-e">GetBucketAsync</span><span class="crayon-sy">(</span><span class="crayon-s">"demo"</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-6"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">cluster</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-v">bucket</span><span class="crayon-sy">.</span><span class="crayon-v">Cluster</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-7"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-8"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">id</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-v">item</span><span class="crayon-sy">.</span><span class="crayon-i">Id</span><span class="crayon-h"> </span><span class="crayon-sy">?</span><span class="crayon-sy">?</span><span class="crayon-h"> </span><span class="crayon-v">Guid</span><span class="crayon-sy">.</span><span class="crayon-e">NewGuid</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-9"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-10"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">result</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">await </span><span class="crayon-v">cluster</span><span class="crayon-sy">.</span><span class="crayon-v">QueryAsync</span><span class="crayon-o"><</span><span class="crayon-v">WishlistItem</span><span class="crayon-o">></span><span class="crayon-sy">(</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-11"> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-sy">@</span><span class="crayon-s">"UPSERT INTO demo._default.wishlist (KEY, VALUE)</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-12"><span class="crayon-s"> VALUES ($id, { "</span><span class="crayon-s">"name"</span><span class="crayon-s">" : $name });"</span><span class="crayon-sy">,</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-13"> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-v">options</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-o">></span><span class="crayon-h"> </span><span class="crayon-i">options</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-14"> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-sy">.</span><span class="crayon-e">Parameter</span><span class="crayon-sy">(</span><span class="crayon-s">"id"</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">id</span><span class="crayon-sy">)</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-15"> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-sy">.</span><span class="crayon-e">Parameter</span><span class="crayon-sy">(</span><span class="crayon-s">"name"</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">item</span><span class="crayon-sy">.</span><span class="crayon-v">Name</span><span class="crayon-sy">)</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-16"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-17"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-18"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-st">return</span><span class="crayon-h"> </span><span class="crayon-e">Ok</span><span class="crayon-sy">(</span><span class="crayon-v">result</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97fae6374154122-19"><span class="crayon-sy">}</span></div></div></td> </tr> </table> </div> </div>  <p><span style="font-weight: 400;">Two important things to point out about this code:</span></p> <ul> <li style="list-style-type: none;"> <ul> <li style="font-weight: 400;" aria-level="1"><span style="font-weight: 400;">It handles both create and update. If </span><em><span style="font-weight: 400;">item</span></em><span style="font-weight: 400;"> has a null ID, this code assumes that a new wishlist item is being created.</span></li> <li style="font-weight: 400;" aria-level="1"><span style="font-weight: 400;">Parameterization: just as in relational databases, SQL++ can be vulnerable to </span><a href="https://owasp.org/www-community/attacks/SQL_Injection" target="_blank" rel="noopener"><span style="font-weight: 400;">SQL injection</span></a><span style="font-weight: 400;">, so parameterization is highly recommended. Notice that SQL++ syntax uses </span><em><span style="font-weight: 400;">$</span></em><span style="font-weight: 400;"> to indicate named paramters (e.g. </span><em><span style="font-weight: 400;">$id</span></em><span style="font-weight: 400;"> and </span><em><span style="font-weight: 400;">$name</span></em><span style="font-weight: 400;">).</span></li> </ul> </li> </ul> <p><span style="font-weight: 400;">This endpoint will work. But as was the case in </span><a href="https://www.couchbase.com/blog/asp-net-core-crud-nosql-part-3/" target="_blank" rel="noopener"><span style="font-weight: 400;">part 3</span></a><span style="font-weight: 400;">, we do not have to use SQL++ to interact with Couchbase. In fact, very similar criteria apply to making the decision when to use key-value and when to use SQL++:</span></p> <table> <tbody> <tr> <td><strong>Use case</strong></td> <td><strong>Key-value?</strong></td> <td><strong>Why or why not?</strong></td> </tr> <tr> <td><span style="font-weight: 400;">Create a new user with key “73892”</span></td> <td><span style="font-weight: 400;">Yes</span></td> <td><span style="font-weight: 400;">Direct access</span></td> </tr> <tr> <td><span style="font-weight: 400;">Modify a user with key “73892”</span></td> <td><span style="font-weight: 400;">Yes</span></td> <td><span style="font-weight: 400;">Direct access</span></td> </tr> <tr> <td><span style="font-weight: 400;">Modify just the email address of a user with key “73892”</span></td> <td><span style="font-weight: 400;">Yes</span></td> <td><span style="font-weight: 400;">Even if the user document is large, Couchbase has a key-based </span><a href="https://docs.couchbase.com/server/current/guides/updating-data.html#updating-a-sub-document" target="_blank" rel="noopener"><span style="font-weight: 400;">sub-document API</span></a><span style="font-weight: 400;">, which allows you to modify a portion of the document.</span></td> </tr> <tr> <td><span style="font-weight: 400;">Modify a group of users with keys “73892”, “47212”, and “90491”</span></td> <td><span style="font-weight: 400;">Yes</span></td> <td><span style="font-weight: 400;">This may require multiple key-value operations, but this still may be faster than using a <em>SQL </em></span><em><span style="font-weight: 400;">SELECT … WHERE … IN</span></em><span style="font-weight: 400;"> query.</span></td> </tr> <tr> <td><span style="font-weight: 400;">Modify all addresses to use “OH” instead of “Ohio”</span></td> <td><span style="font-weight: 400;">No</span></td> <td><span style="font-weight: 400;">User’s state is likely a “secondary” attribute, not a key (multiple users can be from Ohio). This is a good use case for a SQL++ </span><span style="font-weight: 400;">UPDATE</span></td> </tr> </tbody> </table> <p><span style="font-weight: 400;">Because this endpoint only needs to add or change one single wishlist item, let’s use the key-value API instead.</span></p> <h2><b>Write a CreateOrEdit CRUD endpoint</b></h2> <p><span style="font-weight: 400;">Before we get to coding, it’s wise to think about whether <em>CreateOrEdit</em> should be a single endpoint, or split into a <em>Create</em> endpoint and an <em>Edit</em> endpoint. For this very simple wishlist app, there is no validation, authentication, or other system-wide cross cutting concerns. However, in a production system, “adding” data and “updating” data may very well follow different business rules and require different permissions. In that case, you may want to break the operations into two endpoints.</span></p> <p><span style="font-weight: 400;">For now, let’s start with a single endpoint that uses an “upsert”:</span></p> <div id="urvanov-syntax-highlighter-6742b7a97faef709993713" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> [HttpPost] [Route("api/edit")] public async Task<IActionResult> CreateOrEdit(WishlistItem item) { var bucket = await _bucketProvider.GetBucketAsync("demo"); var collection = await bucket.CollectionAsync("wishlist"); var id = item.Id ?? Guid.NewGuid(); await collection.UpsertAsync(id.ToString(), new { Name = item.Name }); return Ok(new { success = true}); }</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-1">1</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-2">2</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-3">3</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-4">4</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-5">5</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-6">6</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-7">7</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-8">8</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-9">9</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-10">10</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-11">11</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-12">12</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-13">13</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-14">14</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-15">15</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6742b7a97faef709993713-16">16</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-1"><span class="crayon-sy">[</span><span class="crayon-v">HttpPost</span><span class="crayon-sy">]</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-2"><span class="crayon-sy">[</span><span class="crayon-e">Route</span><span class="crayon-sy">(</span><span class="crayon-s">"api/edit"</span><span class="crayon-sy">)</span><span class="crayon-sy">]</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-3"><span class="crayon-m">public</span><span class="crayon-h"> </span><span class="crayon-e">async </span><span class="crayon-v">Task</span><span class="crayon-o"><</span><span class="crayon-v">IActionResult</span><span class="crayon-o">></span><span class="crayon-h"> </span><span class="crayon-e">CreateOrEdit</span><span class="crayon-sy">(</span><span class="crayon-e">WishlistItem </span><span class="crayon-v">item</span><span class="crayon-sy">)</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-4"><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-5"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">bucket</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">await </span><span class="crayon-v">_bucketProvider</span><span class="crayon-sy">.</span><span class="crayon-e">GetBucketAsync</span><span class="crayon-sy">(</span><span class="crayon-s">"demo"</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-6"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">collection</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">await </span><span class="crayon-v">bucket</span><span class="crayon-sy">.</span><span class="crayon-e">CollectionAsync</span><span class="crayon-sy">(</span><span class="crayon-s">"wishlist"</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-7"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-8"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">id</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-v">item</span><span class="crayon-sy">.</span><span class="crayon-i">Id</span><span class="crayon-h"> </span><span class="crayon-sy">?</span><span class="crayon-sy">?</span><span class="crayon-h"> </span><span class="crayon-v">Guid</span><span class="crayon-sy">.</span><span class="crayon-e">NewGuid</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-9"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-10"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-e">await </span><span class="crayon-v">collection</span><span class="crayon-sy">.</span><span class="crayon-e">UpsertAsync</span><span class="crayon-sy">(</span><span class="crayon-v">id</span><span class="crayon-sy">.</span><span class="crayon-e">ToString</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-r">new</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-11"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-12"> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-v">Name</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-v">item</span><span class="crayon-sy">.</span><span class="crayon-i">Name</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-13"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-sy">}</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-14"> </div><div class="crayon-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-15"> <span class="crayon-h"> </span> <span class="crayon-h"> </span><span class="crayon-st">return</span><span class="crayon-h"> </span><span class="crayon-e">Ok</span><span class="crayon-sy">(</span><span class="crayon-r">new</span><span class="crayon-h"> </span><span class="crayon-sy">{</span><span class="crayon-h"> </span><span class="crayon-v">success</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-t">true</span><span class="crayon-sy">}</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6742b7a97faef709993713-16"><span class="crayon-sy">}</span></div></div></td> </tr> </table> </div> </div>  <p><span style="font-weight: 400;">Much like the SQL++ endpoint, this endpoint looks at </span><em><span style="font-weight: 400;">Id</span></em><span style="font-weight: 400;"> to determine whether this is a “create” or an “update”.</span></p> <p><span style="font-weight: 400;">The </span><em><span style="font-weight: 400;">UpsertAsync</span></em><span style="font-weight: 400;"> function will either:</span></p> <ul> <li style="list-style-type: none;"> <ul> <li style="font-weight: 400;" aria-level="1"><span style="font-weight: 400;">Create a new document with </span><em><span style="font-weight: 400;">id.ToString()</span></em><span style="font-weight: 400;"> as the key</span></li> <li style="font-weight: 400;" aria-level="1"><span style="font-weight: 400;">Change an existing document with a key of </span><em><span style="font-weight: 400;">id.ToString()</span></em></li> </ul> </li> </ul> <p><span style="font-weight: 400;">In either case, once this endpoint finishes executing, you will end up with a JSON document like </span><em><span style="font-weight: 400;">{ “name” = “wishlist item name”}</span></em><span style="font-weight: 400;"> and a GUID as a key (technically all keys in Couchbase are strings, but we know it’s a GUID string).</span></p> <p><strong>Note: </strong><span style="font-weight: 400;">One subtle difference between the two APIs, is that the </span><em><span style="font-weight: 400;">UPSERT</span></em><span style="font-weight: 400;"> statement will only mutate the one field (</span><em><span style="font-weight: 400;">name</span></em><span style="font-weight: 400;">), while the key-value method </span><em><span style="font-weight: 400;">UpsertAsync</span></em><span style="font-weight: 400;"> will mutate the entire document (which is only </span><em><span style="font-weight: 400;">name</span></em><span style="font-weight: 400;"> for now).</span></p> <h2><b style="color: #343e47; font-family: Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 50px;">ASP.NET CRUD in action</b></h2> <p><span style="font-weight: 400;">Fire up your application from Visual Studio with CTRL+F5, and you should see some new endpoints show up in the OpenAPI / Swagger UI:</span></p> <p><img fetchpriority="high" decoding="async" class="alignnone size-full wp-image-13501" src="https://www.couchbase.com/blog/wp-content/uploads/2022/06/swagger-ui-endpoints.png" alt="ASP.NET endpoints showing in Swagger UI" width="787" height="515" srcset="https://www.couchbase.com/blog/wp-content/uploads/sites/1/2022/06/swagger-ui-endpoints.png 787w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2022/06/swagger-ui-endpoints-300x196.png 300w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2022/06/swagger-ui-endpoints-768x503.png 768w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2022/06/swagger-ui-endpoints-20x13.png 20w" sizes="(max-width: 787px) 100vw, 787px" /></p> <p><span style="font-weight: 400;">From an API consumer’s perspective, both </span><em><span style="font-weight: 400;">/api/edit</span></em><span style="font-weight: 400;"> and </span><em><span style="font-weight: 400;">/api/editWithSql</span></em><span style="font-weight: 400;"> endpoints will function the same. Try it once leaving the ID blank to create a new item, then try it again with a known ID (use </span><span style="font-weight: 400;"><em>/api/getall</em></span><span style="font-weight: 400;"> if you need to get an ID) and observe what happens and what changes.</span></p> <p><span style="font-weight: 400;">For instance, I added a new item “Digital Photo Frame”, by leaving the ID blank (my .NET code generated “<em>1c3de2e7-70ea-4ee2-803b-425bbf6251cb</em>” for me), and I updated the item with ID of “<em>2dab198b-1836-4409-9bdf-17275a2b2462</em>” to have a name of “Skyline Chili 2XL T-Shirt”. Here are the results as seen in the Couchbase Capella UI:</span></p> <p><img decoding="async" class="alignnone size-full wp-image-13502" src="https://www.couchbase.com/blog/wp-content/uploads/2022/06/couchbase-capella-ui-asp.net-project.png" alt="Couchbase Capella UI showing ASP.NET project documents" width="872" height="463" srcset="https://www.couchbase.com/blog/wp-content/uploads/sites/1/2022/06/couchbase-capella-ui-asp.net-project.png 872w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2022/06/couchbase-capella-ui-asp.net-project-300x159.png 300w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2022/06/couchbase-capella-ui-asp.net-project-768x408.png 768w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2022/06/couchbase-capella-ui-asp.net-project-818x434.png 818w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2022/06/couchbase-capella-ui-asp.net-project-20x11.png 20w" sizes="(max-width: 872px) 100vw, 872px" /></p> <h2><b>What’s next?</b></h2> <p><span style="font-weight: 400;">The ASP.NET Core project is connected to Couchbase Capella, and it is now creating/updating (“upserting”) data with key-value (recommended) or SQL++ (not recommended for this specific situation).</span></p> <p><span style="font-weight: 400;">In the next blog post, we’ll round out CRUD with “D” for “delete”.”</span></p> <p><span style="font-weight: 400;">In the meantime, you should:</span></p> <ul> <li style="list-style-type: none;"> <ul> <li style="font-weight: 400;" aria-level="1"><a href="https://cloud.couchbase.com/sign-up" target="_blank" rel="noopener"><span style="font-weight: 400;">Sign up for a Capella free-trial</span></a></li> <li style="font-weight: 400;" aria-level="1"><span style="font-weight: 400;">Check out the </span><a href="https://cloud.couchbase.com/sign-up" target="_blank" rel="noopener"><span style="font-weight: 400;">Couchbase Playground for .NET</span></a><span style="font-weight: 400;"> examples that you can run right in the browser.</span></li> </ul> </li> </ul>  <div class="pp-multiple-authors-boxes-wrapper pp-multiple-authors-wrapper pp-multiple-authors-layout-simple_list multiple-authors-target-the-content box-post-id-14469 box-instance-id-1 ppma_boxes_14469" data-post_id="14469" data-instance_id="1" data-additional_class="pp-multiple-authors-layout-simple_list.multiple-authors-target-the-content" data-original_class="pp-multiple-authors-boxes-wrapper pp-multiple-authors-wrapper box-post-id-14469 box-instance-id-1"> <span class="ppma-layout-prefix"></span> <div class="ppma-author-category-wrap"> <span class="ppma-category-group ppma-category-group-1 category-index-0"> <ul class="pp-multiple-authors-boxes-ul author-ul-0"> <li class="pp-multiple-authors-boxes-li author_index_0 author_matthew-groves has-avatar"> <div class="pp-author-boxes-avatar"> <div class="avatar-image"> <img alt='Matthew Groves' src='https://secure.gravatar.com/avatar/ca7f815e5cfadc140b5a78814865a920?s=35&d=mm&r=g' 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href="https://www.couchbase.com/blog/tag/asp-net-crud/" rel="tag">asp.net crud</a>, <a href="https://www.couchbase.com/blog/tag/asp-net-crud-nosql/" rel="tag">asp.net crud nosql</a>, <a href="https://www.couchbase.com/blog/tag/c/" rel="tag">C#</a>, <a href="https://www.couchbase.com/blog/tag/capella/" rel="tag">Capella</a>, <a href="https://www.couchbase.com/blog/tag/dbaas/" rel="tag">dbaas</a> </li> </ul> </div> </article> <h2 class="widget-title">Author</h2> <div class="author-profile"> <a class="author-profile-avatar" href="https://www.couchbase.com/blog/author/matthew-groves/" title="Posts by Matthew Groves"><img alt='' src='https://secure.gravatar.com/avatar/ca7f815e5cfadc140b5a78814865a920?s=65&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/ca7f815e5cfadc140b5a78814865a920?s=130&d=mm&r=g 2x' class='avatar avatar-65 photo' height='65' width='65' loading='lazy' decoding='async'/></a> <div class="author-profile-info"> <h3 class="author-profile-title"> Posted by Matthew Groves 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