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| <div class="container top-buffer" id="Gora_Gora Ignite Module"> |
| |
| <h2 id="overview">Overview<a class="headerlink" href="#overview" title="Permalink">¶</a></h2> |
| <p>This is the main documentation for the gora-ignite module. <b>gora-ignite</b> module enables <a href="https://ignite.apache.org/">Apache Ignite</a> backend support for Gora.</p> |
| <div id="toc"><ul><li><a class="toc-href" href="#gora-ignite-properties-goraproperties" title="Gora Ignite Properties - gora.properties">Gora Ignite Properties - gora.properties</a></li><li><a class="toc-href" href="#gora-ignite-mappings-gora-ignite-mappingxml" title="Gora Ignite mappings - gora-ignite-mapping.xml">Gora Ignite mappings - gora-ignite-mapping.xml</a></li><li><a class="toc-href" href="#supported-data-types" title="Supported Data types">Supported Data types</a></li></ul></div> |
| <h2 id="gora-ignite-properties-goraproperties">Gora Ignite Properties - gora.properties<a class="headerlink" href="#gora-ignite-properties-goraproperties" title="Permalink">¶</a></h2> |
| <ul> |
| <li><code>gora.datastore.default=org.apache.gora.ignite.store.IgniteStore</code> - Implementation of the persistent Java storage class for Ignite</li> |
| <li><code>gora.datastore.ignite.schema=PUBLIC</code> - Property pointing to the Schema of the Ignite instance</li> |
| <li><code>gora.datastore.ignite.host=localhost</code> - Property pointing to the host where the server is running</li> |
| <li><code>gora.datastore.ignite.port=10800</code> - Property pointing to the port where the server is running</li> |
| <li><code>gora.datastore.ignite.user=username</code> - An optional property defining the username of the server if available</li> |
| <li><code>gora.datastore.ignite.password=password</code> - An optional property defining the password of the server if available</li> |
| <li><code>gora.datastore.ignite.additionalConfigurations=</code> - An optional property defining additional configurations for the Ignite connection, format and available parameters: <a href="https://apacheignite-sql.readme.io/docs/jdbc-driver#section-parameters">Ignite JDBC Parameters</a></li> |
| </ul> |
| <h2 id="gora-ignite-mappings-gora-ignite-mappingxml">Gora Ignite mappings - gora-ignite-mapping.xml<a class="headerlink" href="#gora-ignite-mappings-gora-ignite-mappingxml" title="Permalink">¶</a></h2> |
| <p>You should then create a gora-ignite-mapping.xml which will describe how you want to store each of your Gora persistent objects and which primary keys you want to use:</p> |
| <pre><code><gora-otd> |
| <class name="org.apache.gora.examples.generated.Employee" keyClass="java.lang.String" table="Employee"> |
| <primarykey column="pkssn" type="VARCHAR" /> |
| <field name="ssn" column="ssn" type="VARCHAR"/> |
| <field name="name" column="name" type="VARCHAR"/> |
| <field name="dateOfBirth" column="dateOfBirth" type="BIGINT"/> |
| <field name="salary" column="salary" type="INT"/> |
| <field name="boss" column="boss" type="BINARY"/> |
| <field name="webpage" column="webpage" type="BINARY"/> |
| </class> |
| </gora-otd> |
| </code></pre> |
| <p>Here you can see that we require the definition of child elements within the <code>gora-otd</code> mapping configuration.</p> |
| <p>Each <b>class</b> element should contain the following elements;</p> |
| <ol> |
| <li> |
| <p>a parameter defining the Persistent class name e.g. <b>org.apache.gora.examples.generated.Employee</b>,</p> |
| </li> |
| <li> |
| <p>a parameter defining the keyClass e.g. <b>java.lang.String</b> which specifies the key which maps to the field values,</p> |
| </li> |
| <li> |
| <p>a parameter defining the table e.g. <b>Employee</b> which will be used to persist each Gora object</p> |
| </li> |
| </ol> |
| <p>In addition, within the class element we should define two type of child elements: a primary key (<b>primarykey</b> tag) and some fields (<b>field</b> tag).</p> |
| <p>The primary key element defines which column is used by Ignite to identify the records stored in the DataStore. It has two costumizable parameters: <b>column</b> which defines the column's name of the table to be used as identifier for the records. And <b>type</b> which defines the data type of the aforementioned column.</p> |
| <p>The fields elements define the actual mapping between persistent object's attributes and the table's columns. These mapping have three customizable parameters: <b>name</b> which correspond to the object attribute's name. <b>column</b> which defines the column's name of the table to be assosiated with the attribute. And <b>type</b> which defines the data type of that column.</p> |
| <p>Notice that complex structures such 3-union fields are mapped using Binary fields through <a href="https://avro.apache.org/">Avro</a> serialization.</p> |
| <h2 id="supported-data-types">Supported Data types<a class="headerlink" href="#supported-data-types" title="Permalink">¶</a></h2> |
| <p>Description of supported <b>type</b> values:</p> |
| <table class="table"> |
| <thead> |
| <tr> |
| <th>Type value</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>BINARY</td> |
| <td>Store as Byte[]</td> |
| </tr> |
| <tr> |
| <td>BOOLEAN</td> |
| <td>Store as Boolean</td> |
| </tr> |
| <tr> |
| <td>INT</td> |
| <td>Store as Integer</td> |
| </tr> |
| <tr> |
| <td>TINYINT</td> |
| <td>Store as Byte</td> |
| </tr> |
| <tr> |
| <td>SMALLINT</td> |
| <td>Store as Short</td> |
| </tr> |
| <tr> |
| <td>BIGINT</td> |
| <td>Store as Long</td> |
| </tr> |
| <tr> |
| <td>DECIMAL</td> |
| <td>Store as BigDecimal</td> |
| </tr> |
| <tr> |
| <td>DOUBLE</td> |
| <td>Store as Double</td> |
| </tr> |
| <tr> |
| <td>REAL</td> |
| <td>Store as Float</td> |
| </tr> |
| <tr> |
| <td>VARCHAR</td> |
| <td>Store as Unicode string</td> |
| </tr></tbody></table> |
| <p>A more detailed list of data types supported by Ignite and its equivalents in Java refer to <a href="https://apacheignite-sql.readme.io/docs/data-types">Ignite JDBC Data types</a></p> |
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