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Recently I found the need to use a DAO data source based on an external library in my application. In fact a different data source from my application against which I needed to connect an Ingres database. First off it sounded quite difficult but in the end it was really easy to do.

The fact that it was Ingres and not another RDBMS such as Oracle or MySQL presented no problems. Not even if it’s going to be the database administration for the application. I’ve come across this sort of situation before and haven’t had any problems apart from some data-type incompatibilities, nothing serious.

It was no problem that I needed to use different data source in my application, Just give the source a different name and that’s it. How and where to install? I edited resources.xml adding the new data source and the bean that references the DAO, like so:

<!--- resources.xml -->
< ?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

    <bean id="dataSourceIngres">
        <property name="driverClassName" value="ca.ingres.jdbc.IngresDriver" />
        <property name="url" value="jdbc:ingres://DATABASE" />
        <property name="username" value="USERNAME" />
        <property name="password" value="PASSWORD" />
    </bean>

    <bean id="ingresDao" factory-method="getInstance">
       <property name="dataSource"><ref local="dataSourceIngres"/></property>
    </bean>
</beans>

After that you call getInstance() for the DAO in the application which in turn calls the corresponding method passing the necessary arguments.

—–

Editor’s note: Fátima is using the driver class ca.ingres.jdbc.IngresDriver and not com.ingres.jdbc.IngresDriver since the client is using Ingres 2.6.

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For those who don’t know, Maven is a dependency management and project lifecycle tool for Java projects. The hosting of the Ingres JDBC driver in the central repository raises the profile of the Ingres Database and should make it even easier and appealing for new developers to pick up Ingres as their development database.

Alan Raison has written up some notes in our community wiki and in his blog.

I would like to express my thanks for all those who made this possible, especially to Alan who pushed for this in the first place.

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This update is implements several bits of new functionality as can seen from the CHANGELOG

• Add ingres.fetch_buffer_size to configure to the number of rows ingres_query() will fetch.
• Add ingres_charset() to fetch the installation II_CHARSETxx value
• Add ingres.describe ini setting to allow disabling of DESCRIBE INPUT if desired
• Add support for DESCRIBE INPUT
• Add ingres_escape_string()
• Add ingres_result_seek() to support row positioning

Some Links:

• Package home – http://pecl.php.net/package/ingres
• Changelog – http://pecl.php.net/package-changelog.php?package=ingres
• Source Download – http://pecl.php.net/get/ingres-2.1.0.tgz
• W32 Download – http://esd.ingres.com/product/drivers/PHP/Windows_32-Bit

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2.0.2 is minor release fixing a couple of memory leaks and a SEGV. For your enjoyment, here is the complete CHANGELOG:

- Fix corrupt Ingres MONEY to PHP DOUBLE conversions
- Eliminate memory leak when ingres_free_result() is not called
- Fix ingres_field_name() so it returns the correct column name
- Fix SEGV in php_ii_convert_data() when converting DATE to STRING
- Enable the extension to build on Mac OS X and HP-UX
- Reduce the number of emalloc calls in php_ii_fetch()
- Clean up proto entries in ingres.c
- Make ingres_conn_*() and ingres_stmt_* aliases for their ingres_err*() counterparts

And now for some links:

• README.html – http://cvs.php.net/viewvc.cgi/pecl/ingres/README.html?view=co&pathrev=RELEASE_2_0_2
• Source code – http://pecl.ingres.net/get/ingres
• Windows DLLs – Since http://pecl4win.php.net is no longer being updated, I have made available DLLs for PHP 5.1.6, 5.2.6 and 5.2.8 for Ingres 2.6/0305, 9.0.4, 9.1.1, 9.2.0 and 9.3.0 at http://esd.ingres.com/product/drivers/PHP/Windows_32-Bit/PHP_Driver

As always if you experience any problems with the driver you can email me via grant @ php dot net, or raise and issue via Servicedesk.

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2.0.1 is major/minor release in as much as it is just a bunch of bug fixes but includes some important changes. From the CHANGELOG here are what I believe are the two most notable updates:

1. Improved performance by batch fetching rows – the ingres_fetch_*() functions will now retrieve upto 100 rows from the server, reducing the network traffic required to fetch those same 100 rows, one at a time. Whether the DBMS engine provides 100 rows is another matter as this is dependant upon the width of the row and the ability to make good use of the GCA packet. Performance improvements of between 2 and 30 times have been observed. YMMV…
2. Improved interoperability when working with older Ingres releases – some time in the past interoperability between versions of Ingres broke when using the PHP driver. Driver functionality is based on the Ingres release against which it is built. For example Ingres 9.2.0 introduced bi-directional scrollable cursor support. When the driver was build against 9.2.0 but connected to an earlier release of Ingres it did not know that the DBMS engine could not provide that feature. The driver is now “aware” of the capabilities of the server to which it is connected and will only use features supported in that engine.

And now for some links:

• README.html – http://cvs.php.net/viewvc.cgi/pecl/ingres/README.html?view=co&pathrev=RELEASE_2_0_1
• Source code – http://pecl.ingres.net/get/ingres
• Windows DLLs – Since http://pecl4win.php.net is no longer being updated, I have made available DLLs for PHP 5.1.6, 5.2.6 and 5.2.8 for Ingres 2.6/0305, 9.0.4, 9.1.1, 9.2.0 and 9.3.0 at http://esd.ingres.com/product/drivers/PHP/Windows_32-Bit/PHP_Driver

As always if you experience any problems with the driver you can email me via grant @ php dot net, or raise and issue via Servicedesk.

Feliz Navidad a todos

grant

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