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| <h1 class="title">Creating a Custom Jena JDBC Driver</h1> |
| |
| <p>As noted in the <a href="index.html#overview">overview</a> Jena JDBC drivers are built around a core |
| library which implements much of the common functionality required in an abstract way. This |
| means that it is relatively easy to build a custom driver just by relying on the core library |
| and implementing a minimum of one class.</p> |
| <h2 id="custom-driver-class">Custom Driver class</h2> |
| <p>The one and only thing that you are required to do to create a custom driver is to implement |
| a class that extends <code>JenaDriver</code>. This requires you to implement a constructor which simply |
| needs to call the parent constructor with the relevant inputs, one of these is your driver specific |
| connection URL prefix i.e. the <code>foo</code> in <code>jdbc:jena:foo:</code>. Implementation specific prefixes |
| must conform to the regular expression <code>[A-Za-z\d\-_]+:</code> i.e. some combination of alphanumerics, |
| hyphens and underscores terminated by a colon.</p> |
| <p>Additionally you must override and implement two abstract methods <code>connect()</code> and <code>getPropertyInfo()</code>. |
| The former is used to produce an instance of a <code>JenaConnection</code> while the latter provides information |
| that may be used by tools to present users with some form of user interface for configuring a |
| connection to your driver.</p> |
| <p>An important thing to note is that this may be all you need to do to create a custom driver, it is |
| perfectly acceptable for your <code>connect()</code> implementation to just return one of the implementations |
| from the built-in drivers. This may be useful if you are writing a driver for a specific store and |
| wish to provide simplified connection URL parameters and create the appropriate connection instance |
| programmatically.</p> |
| <h2 id="custom-connection-class">Custom Connection class</h2> |
| <p>The next stage in creating a custom driver (where necessary) is to create a class derived from |
| <code>JenaConnection</code>. This has a somewhat broader set of abstract methods which you will need to implement |
| such as <code>createStatementInternal()</code> and various methods which you may optionally override if you |
| need to deviate from the default behaviors.</p> |
| <p>If you wish to go down this route then we recommend looking at the source for the built in implementations |
| to guide you in this. It may be easier to extend one of the built-in implementations rather than writing |
| an entire custom implementation yourself.</p> |
| <p>Note that custom implementations may also require you to implement custom <code>JenaStatement</code> and <code>JenaPreparedStatement</code> |
| implementations.</p> |
| <h2 id="testing-your-driver">Testing your Driver</h2> |
| <p>To aid testing your custom driver the <code>jena-jdbc-core</code> module provides a number of abstract test classes which |
| can be derived from in order to provide a wide variety of tests for your driver implementation. This is how |
| all the built in drivers are tested so you can check out their test sources for examples of this.</p> |
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