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| <li> |
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| <a href="/docs/2.9.0/configuring-caches/near-cache" |
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| <a href="/docs/2.9.0/data-streaming" class='' >Data Streaming</a> |
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| <a href="/docs/2.9.0/key-value-api/using-scan-queries" |
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| <a href="/docs/2.9.0/sql-reference/ddl" |
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| >Data Definition Language (DDL)</a> |
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| <a href="/docs/2.9.0/sql-reference/dml" |
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| >Data Manipulation Language (DML)</a> |
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| <a href="/docs/2.9.0/sql-reference/operational-commands" |
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| >Operational Commands</a> |
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| <a href="/docs/2.9.0/sql-reference/aggregate-functions" |
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| >Aggregate functions</a> |
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| <a href="/docs/2.9.0/sql-reference/numeric-functions" |
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| >Numeric Functions</a> |
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| <a href="/docs/2.9.0/sql-reference/string-functions" |
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| >String Functions</a> |
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| <li> |
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| <a href="/docs/2.9.0/sql-reference/date-time-functions" |
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| >Data and Time Functions</a> |
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| <a href="/docs/2.9.0/sql-reference/system-functions" |
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| >System Functions</a> |
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| <li> |
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| <a href="/docs/2.9.0/sql-reference/data-types" |
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| >Data Types</a> |
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| >Distributed Computing API</a> |
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| <a href="/docs/2.9.0/distributed-computing/cluster-groups" |
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| >Cluster Groups</a> |
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| <li> |
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| <a href="/docs/2.9.0/distributed-computing/map-reduce" |
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| >MapReduce API</a> |
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| <li> |
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| <a href="/docs/2.9.0/distributed-computing/load-balancing" |
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| >Load Balancing</a> |
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| <a href="/docs/2.9.0/distributed-computing/fault-tolerance" |
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| >Fault Tolerance</a> |
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| <li> |
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| <a href="/docs/2.9.0/distributed-computing/job-scheduling" |
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| >Job Scheduling</a> |
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| <a href="/docs/2.9.0/distributed-computing/collocated-computations" |
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| >Colocating Computations with Data</a> |
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| <a href="/docs/2.9.0/code-deployment/peer-class-loading" |
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| <a href="/docs/2.9.0/machine-learning/partition-based-dataset" |
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| <li><a href="/docs/2.9.0/machine-learning/binary-classification/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/regression/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/clustering/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li> |
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| <li> |
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| >Preprocessing</a> |
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| <li><a href="/docs/2.9.0/machine-learning/model-selection/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/model-selection/evaluator" class=''>Evaluator</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/model-selection/split-the-dataset-on-test-and-train-datasets" class=''>Split the dataset on test and train datasets</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li> |
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| <li> |
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| class='' |
| >Multiclass Classification</a> |
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| </li> |
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| <li><a href="/docs/2.9.0/machine-learning/ensemble-methods/introduction" class=''></a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li> |
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| |
| <li><a href="/docs/2.9.0/machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li> |
| |
| </nav> |
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| <li> |
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| <a href="/docs/2.9.0/machine-learning/recommendation-systems" |
| class='' |
| >Recommendation Systems</a> |
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| </li> |
| |
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| <li> |
| |
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| <button |
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| <li><a href="/docs/2.9.0/machine-learning/importing-model/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/2.9.0/machine-learning/importing-model/model-import-from-gxboost" class=''>Import Model from XGBoost</a></li> |
| |
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| <li><a href="/docs/2.9.0/machine-learning/importing-model/model-import-from-apache-spark" class=''>Import Model from Apache Spark</a></li> |
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| </nav> |
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| </nav> |
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| </li> |
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| <li> |
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| <a href="/docs/2.9.0/key-value-api/continuous-queries" class='' >Using Continuous Queries</a> |
| |
| </li> |
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| <li> |
| |
| |
| <a href="/docs/2.9.0/services/services" class='' >Using Ignite Services</a> |
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| </li> |
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| <li> |
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| <li> |
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| class='' |
| >Memory and JVM Tuning</a> |
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| <li> |
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| <a href="/docs/2.9.0/perf-and-troubleshooting/persistence-tuning" |
| class='' |
| >Persistence Tuning</a> |
| |
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| <a href="/docs/2.9.0/perf-and-troubleshooting/sql-tuning" |
| class='' |
| >SQL Tuning</a> |
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| class='' |
| >Thread Pools Tuning</a> |
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| <a href="/docs/2.9.0/perf-and-troubleshooting/troubleshooting" |
| class='' |
| >Troubleshooting and Debugging</a> |
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| class='' |
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| class='' |
| >Benchmarking With Yardstick</a> |
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| <div class="left-nav__overlay"></div> |
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| |
| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/net-specific/net-entity-framework-cache.adoc" target="_blank">Edit</a> |
| |
| <h1>Entity Framework 2nd Level Cache</h1> |
| |
| <div class="sect1"> |
| <h2 id="overview">Overview</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Entity Framework, as most other ORMs, can use caching on multiple levels.</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>First level caching is performed by <code>DbContext</code> on the entity level (entities are cached within corresponding <code>DbSet</code>)</p> |
| </li> |
| <li> |
| <p>Second level caching is on the level of <code>DataReader</code> and holds raw query data (however, there is no out-of-the-box 2nd |
| level caching mechanism in Entity Framework 6).</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Ignite.NET provides an EF6 second level caching solution that stores data in a distributed Ignite cache. This is ideal |
| for scenarios with multiple application servers using a single SQL database via Entity Framework - cached queries are |
| shared between all machines in the cluster.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="installation">Installation</h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><strong>Binary distribution</strong>: add a reference to <code>Apache.Ignite.EntityFramework.dll</code></p> |
| </li> |
| <li> |
| <p><strong>NuGet</strong>: <code>Install-Package Apache.Ignite.EntityFramework</code></p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="configuration">Configuration</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ignite.NET provides a custom <code>DbConfiguration</code> implementation which enables second level caching - <code>Apache.Ignite.EntityFramework.IgniteDbConfiguration</code>. |
| There is a number of ways to apply <code>DbConfiguration</code> to the EntityFramework <code>DbContext</code>. See the following MSDN document |
| for details: <a href="https://msdn.microsoft.com/en-us/library/jj680699" target="_blank" rel="noopener">msdn.microsoft.com/en-us/library/jj680699</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The simplest way to implement this is to use the <code>[DbConfigurationType]</code> attribute:</p> |
| </div> |
| <code-tabs><code-tab data-tab='C#'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="csharp"><span class="p">[</span><span class="nf">DbConfigurationType</span><span class="p">(</span><span class="k">typeof</span><span class="p">(</span><span class="n">IgniteDbConfiguration</span><span class="p">))]</span> |
| <span class="k">class</span> <span class="nc">MyContext</span> <span class="p">:</span> <span class="n">DbContext</span> |
| <span class="p">{</span> |
| <span class="k">public</span> <span class="k">virtual</span> <span class="n">DbSet</span><span class="p"><</span><span class="n">Foo</span><span class="p">></span> <span class="n">Foos</span> <span class="p">{</span> <span class="k">get</span><span class="p">;</span> <span class="k">set</span><span class="p">;</span> <span class="p">}</span> |
| <span class="k">public</span> <span class="k">virtual</span> <span class="n">DbSet</span><span class="p"><</span><span class="n">Bar</span><span class="p">></span> <span class="n">Bars</span> <span class="p">{</span> <span class="k">get</span><span class="p">;</span> <span class="k">set</span><span class="p">;</span> <span class="p">}</span> |
| <span class="p">}</span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>To customize caching behavior, create a class that inherits <code>IgniteDbConfiguration</code> and call one of the base constructors. |
| The example below shows the most custom base constructor:</p> |
| </div> |
| <code-tabs><code-tab data-tab='C#'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="csharp"><span class="k">private</span> <span class="k">class</span> <span class="nc">MyDbConfiguration</span> <span class="p">:</span> <span class="n">IgniteDbConfiguration</span> |
| <span class="p">{</span> |
| <span class="k">public</span> <span class="nf">MyDbConfiguration</span><span class="p">()</span> |
| <span class="p">:</span> <span class="k">base</span><span class="p">(</span> |
| <span class="c1">// IIgnite instance to use</span> |
| <span class="n">Ignition</span><span class="p">.</span><span class="nf">Start</span><span class="p">(),</span> |
| <span class="c1">// Metadata cache configuration (small cache, does not tolerate data loss)</span> |
| <span class="c1">// Should be replicated or partitioned with backups</span> |
| <span class="k">new</span> <span class="nf">CacheConfiguration</span><span class="p">(</span><span class="s">"metaCache"</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="n">CacheMode</span> <span class="p">=</span> <span class="n">CacheMode</span><span class="p">.</span><span class="n">Replicated</span> |
| <span class="p">},</span> |
| <span class="c1">// Data cache configuration (large cache, holds actual query results,</span> |
| <span class="c1">// tolerates data loss). Can have no backups.</span> |
| <span class="k">new</span> <span class="nf">CacheConfiguration</span><span class="p">(</span><span class="s">"dataCache"</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="n">CacheMode</span> <span class="p">=</span> <span class="n">CacheMode</span><span class="p">.</span><span class="n">Partitioned</span><span class="p">,</span> |
| <span class="n">Backups</span> <span class="p">=</span> <span class="m">0</span> |
| <span class="p">},</span> |
| <span class="c1">// Custom caching policy.</span> |
| <span class="k">new</span> <span class="nf">MyCachingPolicy</span><span class="p">())</span> |
| <span class="p">{</span> |
| <span class="c1">// No-op.</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| |
| <span class="c1">// Apply custom configuration to the DbContext</span> |
| <span class="p">[</span><span class="nf">DbConfigurationType</span><span class="p">(</span><span class="k">typeof</span><span class="p">(</span><span class="n">MyDbConfiguration</span><span class="p">))]</span> |
| <span class="k">class</span> <span class="nc">MyContext</span> <span class="p">:</span> <span class="n">DbContext</span> |
| <span class="p">{</span> |
| <span class="p">...</span> |
| <span class="p">}</span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="sect2"> |
| <h3 id="caching-policy">Caching Policy</h3> |
| <div class="paragraph"> |
| <p>The caching policy feature controls a selected caching mode, expiration, and which entity sets should be cached. With the default |
| <code>null</code> policy, all entity sets are cached in the <code>ReadWrite</code> mode with no expiration. A caching policy can be configured |
| by implementing the <code>IDbCachingPolicy</code> interface or inheriting the <code>DbCachingPolicy</code> class. The example below shows a sample implementation:</p> |
| </div> |
| <code-tabs><code-tab data-tab='C#'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="csharp"><span class="k">public</span> <span class="k">class</span> <span class="nc">DbCachingPolicy</span> <span class="p">:</span> <span class="n">IDbCachingPolicy</span> |
| <span class="p">{</span> |
| <span class="c1">/// <summary></span> |
| <span class="c1">/// Determines whether the specified query can be cached.</span> |
| <span class="c1">/// </summary></span> |
| <span class="k">public</span> <span class="k">virtual</span> <span class="kt">bool</span> <span class="nf">CanBeCached</span><span class="p">(</span><span class="n">DbQueryInfo</span> <span class="n">queryInfo</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="c1">// This method is called before database call.</span> |
| <span class="c1">// Cache only Persons.</span> |
| <span class="k">return</span> <span class="n">queryInfo</span><span class="p">.</span><span class="n">AffectedEntitySets</span><span class="p">.</span><span class="nf">All</span><span class="p">(</span><span class="n">x</span> <span class="p">=></span> <span class="n">x</span><span class="p">.</span><span class="n">Name</span> <span class="p">==</span> <span class="s">"Person"</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="c1">/// <summary></span> |
| <span class="c1">/// Determines whether specified number of rows should be cached.</span> |
| <span class="c1">/// </summary></span> |
| <span class="k">public</span> <span class="k">virtual</span> <span class="kt">bool</span> <span class="nf">CanBeCached</span><span class="p">(</span><span class="n">DbQueryInfo</span> <span class="n">queryInfo</span><span class="p">,</span> <span class="kt">int</span> <span class="n">rowCount</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="c1">// This method is called after database call.</span> |
| <span class="c1">// Cache only queries that return less than 1000 rows.</span> |
| <span class="k">return</span> <span class="n">rowCount</span> <span class="p"><</span> <span class="m">1000</span><span class="p">;</span> |
| <span class="p">}</span> |
| |
| <span class="c1">/// <summary></span> |
| <span class="c1">/// Gets the absolute expiration timeout for a given query.</span> |
| <span class="c1">/// </summary></span> |
| <span class="k">public</span> <span class="k">virtual</span> <span class="n">TimeSpan</span> <span class="nf">GetExpirationTimeout</span><span class="p">(</span><span class="n">DbQueryInfo</span> <span class="n">queryInfo</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="c1">// Cache for 5 minutes.</span> |
| <span class="k">return</span> <span class="n">TimeSpan</span><span class="p">.</span><span class="nf">FromMinutes</span><span class="p">(</span><span class="m">5</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="c1">/// <summary></span> |
| <span class="c1">/// Gets the caching strategy for a given query.</span> |
| <span class="c1">/// </summary></span> |
| <span class="k">public</span> <span class="k">virtual</span> <span class="n">DbCachingMode</span> <span class="nf">GetCachingMode</span><span class="p">(</span><span class="n">DbQueryInfo</span> <span class="n">queryInfo</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="c1">// Cache with invalidation.</span> |
| <span class="k">return</span> <span class="n">DbCachingMode</span><span class="p">.</span><span class="n">ReadWrite</span><span class="p">;</span> |
| <span class="p">}</span> |
| <span class="p">}</span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| </div> |
| <div class="sect2"> |
| <h3 id="caching-modes">Caching Modes</h3> |
| <table class="tableblock frame-all grid-all stripes-even stretch"> |
| <colgroup> |
| <col style="width: 25%;"> |
| <col style="width: 75%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">DbCachingMode</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>ReadOnly</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Read-only mode, never invalidates. Database updates are ignored in this mode. Once query results have been |
| cached, they are kept in cache until expired (forever when no expiration is specified). This mode is suitable for data |
| that is not expected to change (like a list of countries and other dictionary data).</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>ReadWrite</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Read-write mode. Cached data is invalidated when underlying entity set changes. This is "normal" cache mode |
| which always provides correct query results. Keep in mind that this mode works correctly only when all database changes |
| are performed via DbContext with Ignite caching configured. Other database updates are not tracked.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="app-config-web-config">app.config & web.config</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ignite caching can be enabled in the config files by providing an assembly-qualified type name of <code>IgniteDbConfiguration</code> (or your class that inherits it):</p> |
| </div> |
| <code-tabs><code-tab data-tab='app.config'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="xml"><span class="nt"><entityFramework</span> <span class="na">codeConfigurationType=</span><span class="s">"Apache.Ignite.EntityFramework.IgniteDbConfiguration, Apache.Ignite.EntityFramework"</span><span class="nt">></span> |
| ...Your EF config... |
| <span class="nt"></entityFramework></span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="advanced-configuration">Advanced Configuration</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>When there is no possibility to inherit <code>IgniteDbConfiguration</code> (it already inherits some other class), you can call the |
| <code>IgniteDbConfiguration.InitializeIgniteCaching</code> static method from the constructor, passing <code>this</code> as the first argument:</p> |
| </div> |
| <code-tabs><code-tab data-tab='C#'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="csharp"><span class="k">private</span> <span class="k">class</span> <span class="nc">MyDbConfiguration</span> <span class="p">:</span> <span class="n">OtherDbConfiguration</span> |
| <span class="p">{</span> |
| <span class="k">public</span> <span class="nf">MyDbConfiguration</span><span class="p">()</span> <span class="p">:</span> <span class="k">base</span><span class="p">(...)</span> |
| <span class="p">{</span> |
| <span class="n">IgniteDbConfiguration</span><span class="p">.</span><span class="nf">InitializeIgniteCaching</span><span class="p">(</span><span class="k">this</span><span class="p">,</span> <span class="n">Ignition</span><span class="p">.</span><span class="nf">GetIgnite</span><span class="p">(),</span> <span class="k">null</span><span class="p">,</span> <span class="k">null</span><span class="p">,</span> <span class="k">null</span><span class="p">);</span> |
| <span class="p">}</span> |
| <span class="p">}</span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| </div> |
| </div> |
| <div class="copyright"> |
| © 2020 The Apache Software Foundation.<br/> |
| Apache, Apache Ignite, the Apache feather and the Apache Ignite logo are either registered trademarks or trademarks of The Apache Software Foundation. |
| |
| </div> |
| |
| </article> |
| <nav class="right-nav" data-swiftype-index='false'> |
| <ul class="sectlevel1"> |
| <li><a href="#overview">Overview</a></li> |
| <li><a href="#installation">Installation</a></li> |
| <li><a href="#configuration">Configuration</a> |
| <ul class="sectlevel2"> |
| <li><a href="#caching-policy">Caching Policy</a></li> |
| <li><a href="#caching-modes">Caching Modes</a></li> |
| </ul> |
| </li> |
| <li><a href="#app-config-web-config">app.config & web.config</a></li> |
| <li><a href="#advanced-configuration">Advanced Configuration</a></li> |
| </ul> |
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