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<a href="/docs/2.11.1/starting-nodes" class='' >Starting and Stopping Nodes</a>
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<a href="/docs/2.11.1/clustering/connect-client-nodes"
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<a href="/docs/2.11.1/clustering/baseline-topology"
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>Baseline Topology</a>
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>.NET Thin Client</a>
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<a href="/docs/2.11.1/thin-clients/php-thin-client"
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<li><a href="/docs/2.11.1/binary-client-protocol/key-value-queries" class=''>Key-Value Queries</a></li>
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<li><a href="/docs/2.11.1/binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li>
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<a href="/docs/2.11.1/data-modeling/data-modeling"
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<a href="/docs/2.11.1/data-modeling/affinity-collocation"
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<a href="/docs/2.11.1/data-modeling/binary-marshaller"
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<a href="/docs/2.11.1/memory-configuration/data-regions"
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>Configuring Data Regions</a>
</li>
<li>
<a href="/docs/2.11.1/memory-configuration/eviction-policies"
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>Eviction Policies</a>
</li>
<li>
<a href="/docs/2.11.1/memory-configuration/replacement-policies"
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<button type='button' class='group-toggle expanded '>Configuring Persistence<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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>External Storage</a>
</li>
<li>
<a href="/docs/2.11.1/persistence/swap"
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</li>
<li>
<a href="/docs/2.11.1/persistence/custom-cache-store"
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>Implementing Custom Cache Store</a>
</li>
<li>
<a href="/docs/2.11.1/persistence/snapshot-directory"
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>Configuring Snapshot Directory</a>
</li>
<li>
<a href="/docs/2.11.1/persistence/snapshots"
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>Cluster Snapshots</a>
</li>
<li>
<a href="/docs/2.11.1/persistence/disk-compression"
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</li>
<li>
<a href="/docs/2.11.1/persistence/persistence-tuning"
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</li>
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</li>
<li>
<a href="/docs/2.11.1/snapshots/snapshots" class='' >Cluster Snapshots</a>
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<button type='button' class='group-toggle collapsed '>Configuring Caches<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.11.1/configuring-caches/configuration-overview"
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<li>
<a href="/docs/2.11.1/configuring-caches/configuring-backups"
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>Configuring Partition Backups</a>
</li>
<li>
<a href="/docs/2.11.1/configuring-caches/partition-loss-policy"
class=''
>Partition Loss Policy</a>
</li>
<li>
<a href="/docs/2.11.1/configuring-caches/atomicity-modes"
class=''
>Atomicity Modes</a>
</li>
<li>
<a href="/docs/2.11.1/configuring-caches/expiry-policies"
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>Expiry Policy</a>
</li>
<li>
<a href="/docs/2.11.1/configuring-caches/on-heap-caching"
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>On-Heap Caching</a>
</li>
<li>
<a href="/docs/2.11.1/configuring-caches/cache-groups"
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</li>
<li>
<a href="/docs/2.11.1/configuring-caches/near-cache"
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</li>
<li>
<a href="/docs/2.11.1/data-rebalancing" class='' >Data Rebalancing</a>
</li>
<li>
<a href="/docs/2.11.1/data-streaming" class='' >Data Streaming</a>
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<button type='button' class='group-toggle collapsed '>Using Key-Value API<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.11.1/key-value-api/basic-cache-operations"
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<a href="/docs/2.11.1/key-value-api/binary-objects"
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</li>
<li>
<a href="/docs/2.11.1/key-value-api/using-scan-queries"
class=''
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</li>
<li>
<a href="/docs/2.11.1/read-repair"
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<li>
<a href="/docs/2.11.1/key-value-api/transactions" class='' >Performing Transactions</a>
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<a href="/docs/2.11.1/SQL/sql-introduction"
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<a href="/docs/2.11.1/SQL/schemas"
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<li>
<a href="/docs/2.11.1/SQL/indexes"
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</li>
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<a href="/docs/2.11.1/SQL/sql-api"
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<li>
<a href="/docs/2.11.1/SQL/distributed-joins"
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<a href="/docs/2.11.1/SQL/sql-transactions"
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<a href="/docs/2.11.1/SQL/custom-sql-func"
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<a href="/docs/2.11.1/SQL/JDBC/jdbc-driver"
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<a href="/docs/2.11.1/SQL/JDBC/jdbc-client-driver"
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<li><a href="/docs/2.11.1/SQL/ODBC/specification" class=''>Specification</a></li>
<li><a href="/docs/2.11.1/SQL/ODBC/data-types" class=''>Data Types</a></li>
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<a href="/docs/2.11.1/transactions/mvcc"
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<a href="/docs/2.11.1/sql-reference/sql-conformance"
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<a href="/docs/2.11.1/sql-reference/ddl"
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<li>
<a href="/docs/2.11.1/sql-reference/dml"
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>Data Manipulation Language (DML)</a>
</li>
<li>
<a href="/docs/2.11.1/sql-reference/transactions"
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>Transactions</a>
</li>
<li>
<a href="/docs/2.11.1/sql-reference/operational-commands"
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>Operational Commands</a>
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<li>
<a href="/docs/2.11.1/sql-reference/aggregate-functions"
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>Aggregate functions</a>
</li>
<li>
<a href="/docs/2.11.1/sql-reference/numeric-functions"
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>Numeric Functions</a>
</li>
<li>
<a href="/docs/2.11.1/sql-reference/string-functions"
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>String Functions</a>
</li>
<li>
<a href="/docs/2.11.1/sql-reference/date-time-functions"
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>Data and Time Functions</a>
</li>
<li>
<a href="/docs/2.11.1/sql-reference/system-functions"
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>System Functions</a>
</li>
<li>
<a href="/docs/2.11.1/sql-reference/data-types"
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<a href="/docs/2.11.1/distributed-computing/distributed-computing"
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<li>
<a href="/docs/2.11.1/distributed-computing/cluster-groups"
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>Cluster Groups</a>
</li>
<li>
<a href="/docs/2.11.1/distributed-computing/executor-service"
class=''
>Executor Service</a>
</li>
<li>
<a href="/docs/2.11.1/distributed-computing/map-reduce"
class=''
>MapReduce API</a>
</li>
<li>
<a href="/docs/2.11.1/distributed-computing/load-balancing"
class=''
>Load Balancing</a>
</li>
<li>
<a href="/docs/2.11.1/distributed-computing/fault-tolerance"
class=''
>Fault Tolerance</a>
</li>
<li>
<a href="/docs/2.11.1/distributed-computing/job-scheduling"
class=''
>Job Scheduling</a>
</li>
<li>
<a href="/docs/2.11.1/distributed-computing/collocated-computations"
class=''
>Colocating Computations with Data</a>
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<button type='button' class='group-toggle collapsed '>Code Deployment<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.11.1/code-deployment/deploying-user-code"
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<li>
<a href="/docs/2.11.1/code-deployment/peer-class-loading"
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>Peer Class Loading</a>
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<a href="/docs/2.11.1/machine-learning/machine-learning"
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<li>
<a href="/docs/2.11.1/machine-learning/partition-based-dataset"
class=''
>Partition Based Dataset</a>
</li>
<li>
<a href="/docs/2.11.1/machine-learning/updating-trained-models"
class=''
>Updating Trained Models</a>
</li>
<li>
<button
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<li><a href="/docs/2.11.1/machine-learning/binary-classification/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.11.1/machine-learning/binary-classification/linear-svm" class=''>Linear SVM (Support Vector Machine)</a></li>
<li><a href="/docs/2.11.1/machine-learning/binary-classification/decision-trees" class=''>Decision Trees</a></li>
<li><a href="/docs/2.11.1/machine-learning/binary-classification/multilayer-perceptron" class=''>Multilayer Perceptron</a></li>
<li><a href="/docs/2.11.1/machine-learning/binary-classification/logistic-regression" class=''>Logistic Regression</a></li>
<li><a href="/docs/2.11.1/machine-learning/binary-classification/knn-classification" class=''>k-NN Classification</a></li>
<li><a href="/docs/2.11.1/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li>
<li><a href="/docs/2.11.1/machine-learning/binary-classification/naive-bayes" class=''>Naive Bayes</a></li>
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<button
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<li><a href="/docs/2.11.1/machine-learning/regression/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.11.1/machine-learning/regression/linear-regression" class=''>Linear Regression</a></li>
<li><a href="/docs/2.11.1/machine-learning/regression/decision-trees-regression" class=''>Decision Trees Regression</a></li>
<li><a href="/docs/2.11.1/machine-learning/regression/knn-regression" class=''>k-NN Regression</a></li>
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<li>
<button
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<li><a href="/docs/2.11.1/machine-learning/clustering/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.11.1/machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li>
<li><a href="/docs/2.11.1/machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li>
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</li>
<li>
<a href="/docs/2.11.1/machine-learning/preprocessing"
class=''
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<li>
<button
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<li><a href="/docs/2.11.1/machine-learning/model-selection/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.11.1/machine-learning/model-selection/evaluator" class=''>Evaluator</a></li>
<li><a href="/docs/2.11.1/machine-learning/model-selection/split-the-dataset-on-test-and-train-datasets" class=''>Split the dataset on test and train datasets</a></li>
<li><a href="/docs/2.11.1/machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li>
<li><a href="/docs/2.11.1/machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li>
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</li>
<li>
<a href="/docs/2.11.1/machine-learning/multiclass-classification"
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>Multiclass Classification</a>
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<button
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<li><a href="/docs/2.11.1/machine-learning/ensemble-methods/introduction" class=''></a></li>
<li><a href="/docs/2.11.1/machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li>
<li><a href="/docs/2.11.1/machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li>
<li><a href="/docs/2.11.1/machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li>
<li><a href="/docs/2.11.1/machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li>
</nav>
</li>
<li>
<a href="/docs/2.11.1/machine-learning/recommendation-systems"
class=''
>Recommendation Systems</a>
</li>
<li>
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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/persistence/custom-cache-store.adoc" target="_blank">Edit</a>
<h1>Implementing Custom Cache Store</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>You can implement your own custom <code>CacheStore</code> and use it as an underlying data storage for the cache. The methods of <code>IgniteCache</code> that read or modify the data will call the corresponding methods of the <code>CacheStore</code> implementation.</p>
</div>
<div class="paragraph">
<p>The following table describes the methods of the <code>CacheStore</code> interface.</p>
</div>
<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">Method</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>loadCache()</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The <code>loadCache(&#8230;&#8203;)</code> method is called whenever <code>IgniteCache.loadCache(&#8230;&#8203;)</code> is called and is usually used to preload data from the underlying database into memory. This method loads data on all nodes on which the cache is present.</p>
<p class="tableblock">To load the data on a single node, call <code>IgniteCache.localLoadCache()</code> on that node.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>load()</code>, <code>write()</code>, <code>delete()</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The <code>load()</code>, <code>write()</code>, and <code>delete()</code> methods are called whenever the <code>get()</code>, <code>put()</code>, and <code>remove()</code> methods are called on the <code>IgniteCache</code> interface. These methods are used to enable the <em>read-through</em> and <em>write-through</em> behavior when working with individual cache entries.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>loadAll()</code>, <code>writeAll()</code>, <code>deleteAll()</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>loadAll()</code>, <code>writeAll()</code>, and <code>deleteAll()</code> in the <code>CacheStore</code> are called whenever methods <code>getAll()</code>, <code>putAll()</code>, and <code>removeAll()</code> are called on the <code>IgniteCache</code> interface. These methods are used to enable the read-through and write-through behavior when working with multiple cache entries and should generally be implemented using batch operations to provide better performance.</p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect1">
<h2 id="cachestoreadapter">CacheStoreAdapter</h2>
<div class="sectionbody">
<div class="paragraph">
<p><code>CacheStoreAdapter</code> is an extension of <code>CacheStore</code> that provides default implementations for bulk operations, such as <code>loadAll(Iterable)</code>, <code>writeAll(Collection)</code>, and <code>deleteAll(Collection)</code>, by iterating through all entries and calling corresponding <code>load()</code>, <code>write()</code>, and <code>delete()</code> operations on individual entries.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cachestoresession">CacheStoreSession</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Cache store sessions are used to hold the context between multiple operations on the store and mainly employed to provide transactional support. The operations within one transaction are executed using the same database connection, and the connection is committed when the transaction commits.
Cache store session is represented by an object of the <code>CacheStoreSession</code> class, which can be injected into your <code>CacheStore</code> implementation via the <code>@GridCacheStoreSessionResource</code> annotation.</p>
</div>
<div class="paragraph">
<p>An example of how to implement a transactional cache store can be found on <a href="https://github.com/apache/ignite/tree/master/examples/src/main/java/org/apache/ignite/examples/datagrid/store/jdbc/CacheJdbcPersonStore.java">GitHub</a>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="example">Example</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Below is an example of a non-transactional implementation of <code>CacheStore</code>. For an example of the implementation with support for transactions, please refer to the <a href="https://github.com/apache/ignite/tree/master/examples/src/main/java/org/apache/ignite/examples/datagrid/store/jdbc/CacheJdbcPersonStore.java">CacheJdbcPersonStore.java</a> file on GitHub.</p>
</div>
<div class="listingblock">
<div class="title">JDBC non-transactional</div>
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">CacheJdbcPersonStore</span> <span class="kd">extends</span> <span class="nc">CacheStoreAdapter</span><span class="o">&lt;</span><span class="nc">Long</span><span class="o">,</span> <span class="nc">Person</span><span class="o">&gt;</span> <span class="o">{</span>
<span class="c1">// This method is called whenever the "get(...)" methods are called on IgniteCache.</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">Person</span> <span class="nf">load</span><span class="o">(</span><span class="nc">Long</span> <span class="n">key</span><span class="o">)</span> <span class="o">{</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">Connection</span> <span class="n">conn</span> <span class="o">=</span> <span class="n">connection</span><span class="o">())</span> <span class="o">{</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">PreparedStatement</span> <span class="n">st</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="na">prepareStatement</span><span class="o">(</span><span class="s">"select * from PERSON where id=?"</span><span class="o">))</span> <span class="o">{</span>
<span class="n">st</span><span class="o">.</span><span class="na">setLong</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="n">key</span><span class="o">);</span>
<span class="nc">ResultSet</span> <span class="n">rs</span> <span class="o">=</span> <span class="n">st</span><span class="o">.</span><span class="na">executeQuery</span><span class="o">();</span>
<span class="k">return</span> <span class="n">rs</span><span class="o">.</span><span class="na">next</span><span class="o">()</span> <span class="o">?</span> <span class="k">new</span> <span class="nc">Person</span><span class="o">(</span><span class="n">rs</span><span class="o">.</span><span class="na">getInt</span><span class="o">(</span><span class="mi">1</span><span class="o">),</span> <span class="n">rs</span><span class="o">.</span><span class="na">getString</span><span class="o">(</span><span class="mi">2</span><span class="o">))</span> <span class="o">:</span> <span class="kc">null</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="nc">SQLException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nf">CacheLoaderException</span><span class="o">(</span><span class="s">"Failed to load: "</span> <span class="o">+</span> <span class="n">key</span><span class="o">,</span> <span class="n">e</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">write</span><span class="o">(</span><span class="nc">Entry</span><span class="o">&lt;?</span> <span class="kd">extends</span> <span class="nc">Long</span><span class="o">,</span> <span class="o">?</span> <span class="kd">extends</span> <span class="nc">Person</span><span class="o">&gt;</span> <span class="n">entry</span><span class="o">)</span> <span class="kd">throws</span> <span class="nc">CacheWriterException</span> <span class="o">{</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">Connection</span> <span class="n">conn</span> <span class="o">=</span> <span class="n">connection</span><span class="o">())</span> <span class="o">{</span>
<span class="c1">// Syntax of MERGE statement is database specific and should be adopted for your database.</span>
<span class="c1">// If your database does not support MERGE statement then use sequentially</span>
<span class="c1">// update, insert statements.</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">PreparedStatement</span> <span class="n">st</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="na">prepareStatement</span><span class="o">(</span><span class="s">"merge into PERSON (id, name) key (id) VALUES (?, ?)"</span><span class="o">))</span> <span class="o">{</span>
<span class="nc">Person</span> <span class="n">val</span> <span class="o">=</span> <span class="n">entry</span><span class="o">.</span><span class="na">getValue</span><span class="o">();</span>
<span class="n">st</span><span class="o">.</span><span class="na">setLong</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="n">entry</span><span class="o">.</span><span class="na">getKey</span><span class="o">());</span>
<span class="n">st</span><span class="o">.</span><span class="na">setString</span><span class="o">(</span><span class="mi">2</span><span class="o">,</span> <span class="n">val</span><span class="o">.</span><span class="na">getName</span><span class="o">());</span>
<span class="n">st</span><span class="o">.</span><span class="na">executeUpdate</span><span class="o">();</span>
<span class="o">}</span>
<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="nc">SQLException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nf">CacheWriterException</span><span class="o">(</span><span class="s">"Failed to write entry ("</span> <span class="o">+</span> <span class="n">entry</span> <span class="o">+</span> <span class="s">")"</span><span class="o">,</span> <span class="n">e</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="c1">// This method is called whenever the "remove(...)" method are called on IgniteCache.</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">delete</span><span class="o">(</span><span class="nc">Object</span> <span class="n">key</span><span class="o">)</span> <span class="o">{</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">Connection</span> <span class="n">conn</span> <span class="o">=</span> <span class="n">connection</span><span class="o">())</span> <span class="o">{</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">PreparedStatement</span> <span class="n">st</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="na">prepareStatement</span><span class="o">(</span><span class="s">"delete from PERSON where id=?"</span><span class="o">))</span> <span class="o">{</span>
<span class="n">st</span><span class="o">.</span><span class="na">setLong</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="o">(</span><span class="nc">Long</span><span class="o">)</span> <span class="n">key</span><span class="o">);</span>
<span class="n">st</span><span class="o">.</span><span class="na">executeUpdate</span><span class="o">();</span>
<span class="o">}</span>
<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="nc">SQLException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nf">CacheWriterException</span><span class="o">(</span><span class="s">"Failed to delete: "</span> <span class="o">+</span> <span class="n">key</span><span class="o">,</span> <span class="n">e</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="c1">// This method is called whenever the "loadCache()" and "localLoadCache()"</span>
<span class="c1">// methods are called on IgniteCache. It is used for bulk-loading the cache.</span>
<span class="c1">// If you don't need to bulk-load the cache, skip this method.</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">loadCache</span><span class="o">(</span><span class="nc">IgniteBiInClosure</span><span class="o">&lt;</span><span class="nc">Long</span><span class="o">,</span> <span class="nc">Person</span><span class="o">&gt;</span> <span class="n">clo</span><span class="o">,</span> <span class="nc">Object</span><span class="o">...</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="n">args</span> <span class="o">==</span> <span class="kc">null</span> <span class="o">||</span> <span class="n">args</span><span class="o">.</span><span class="na">length</span> <span class="o">==</span> <span class="mi">0</span> <span class="o">||</span> <span class="n">args</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nf">CacheLoaderException</span><span class="o">(</span><span class="s">"Expected entry count parameter is not provided."</span><span class="o">);</span>
<span class="kd">final</span> <span class="kt">int</span> <span class="n">entryCnt</span> <span class="o">=</span> <span class="o">(</span><span class="nc">Integer</span><span class="o">)</span> <span class="n">args</span><span class="o">[</span><span class="mi">0</span><span class="o">];</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">Connection</span> <span class="n">conn</span> <span class="o">=</span> <span class="n">connection</span><span class="o">())</span> <span class="o">{</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">PreparedStatement</span> <span class="n">st</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="na">prepareStatement</span><span class="o">(</span><span class="s">"select * from PERSON"</span><span class="o">))</span> <span class="o">{</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">ResultSet</span> <span class="n">rs</span> <span class="o">=</span> <span class="n">st</span><span class="o">.</span><span class="na">executeQuery</span><span class="o">())</span> <span class="o">{</span>
<span class="kt">int</span> <span class="n">cnt</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span>
<span class="k">while</span> <span class="o">(</span><span class="n">cnt</span> <span class="o">&lt;</span> <span class="n">entryCnt</span> <span class="o">&amp;&amp;</span> <span class="n">rs</span><span class="o">.</span><span class="na">next</span><span class="o">())</span> <span class="o">{</span>
<span class="nc">Person</span> <span class="n">person</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">Person</span><span class="o">(</span><span class="n">rs</span><span class="o">.</span><span class="na">getInt</span><span class="o">(</span><span class="mi">1</span><span class="o">),</span> <span class="n">rs</span><span class="o">.</span><span class="na">getString</span><span class="o">(</span><span class="mi">2</span><span class="o">));</span>
<span class="n">clo</span><span class="o">.</span><span class="na">apply</span><span class="o">(</span><span class="n">person</span><span class="o">.</span><span class="na">getId</span><span class="o">(),</span> <span class="n">person</span><span class="o">);</span>
<span class="n">cnt</span><span class="o">++;</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="nc">SQLException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nf">CacheLoaderException</span><span class="o">(</span><span class="s">"Failed to load values from cache store."</span><span class="o">,</span> <span class="n">e</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="c1">// Open JDBC connection.</span>
<span class="kd">private</span> <span class="nc">Connection</span> <span class="nf">connection</span><span class="o">()</span> <span class="kd">throws</span> <span class="nc">SQLException</span> <span class="o">{</span>
<span class="c1">// Open connection to your RDBMS systems (Oracle, MySQL, Postgres, DB2, Microsoft SQL, etc.)</span>
<span class="nc">Connection</span> <span class="n">conn</span> <span class="o">=</span> <span class="nc">DriverManager</span><span class="o">.</span><span class="na">getConnection</span><span class="o">(</span><span class="s">"jdbc:mysql://[host]:[port]/[database]"</span><span class="o">,</span> <span class="s">"YOUR_USER_NAME"</span><span class="o">,</span> <span class="s">"YOUR_PASSWORD"</span><span class="o">);</span>
<span class="n">conn</span><span class="o">.</span><span class="na">setAutoCommit</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span>
<span class="k">return</span> <span class="n">conn</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span></code></pre>
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