Click here to close now.

Welcome!

You will be redirected in 30 seconds or close now.

ColdFusion Authors: Yakov Fain, Maureen O'Gara, Nancy Y. Nee, Tad Anderson, Daniel Kaar

Related Topics: ColdFusion

ColdFusion: Article

Working with the Apache Derby Database and ColdFusion

A basic introduction

Early releases of Cold Fusion (under Allaire) focused on the Windows market and it was common to include example Access databases. It was common for entry-level developers to take this example to heart and build systems on Access back-ends. One didn't have to install, set up, admin, or most importantly pay for anything. With the beta release of ColdFusion 8, Adobe is providing support for an array of open source databases. Now using PostgreSQL, MySQL, or Apache Derby (formerly IBM Cloudscape) has been made that simpler for CF developers since JDBC drivers for all of them are included. Any of these solutions can be used for the free distribution of databases on either Windows or *nix. The same can't be said of Access. Adobe has made moving to open source more convenient by including Derby in the base install of Scorpio. It will now likely become common for systems to be distributed with Derby databases because of their operating system independence, royalty-free distribution, small footprint, and ease of installation. This article attempts to help early adopters try Derby out with ColdFusion 8.

Terminology
Apache Derby is a pure Java database that supports almost all of the SQL-92 standard. It fits in about 2MB of memory, a nice efficient footprint for memory-constrained environments like mobile applications (or your desktop masquerading as a server). With ColdFusion it runs on J2SE 1.6 and the shipping driver is a native protocol, a pure Java (level 4) driver. There are two flavors of Derby: embedded and network. Simply put, embedded is a direct-connect (you have to run it in the same JVM as the code connecting to it), single-client database while network adds networking and multi-client support.

The Embedded Database
Once you install Scorpio and find your way to the Data Sources section of the Administrator, you'll see four Derby Embedded example databases (and zero Access databases). The example databases are installed in /ColdFusion8/db. (Note: File references in this article assume that ColdFusion is installed at the root of your filesystem. If you're on Windows, the default install path is C:\ColdFusion8 and the references below should be changed accordingly.)

One of these examples is the CFBookClub database. One can query this database in the same way as any other in ColdFusion, using the CFQuery, CFQueryParam, CFStoredProc, and CFProcParam tags. Create a new page called testDatabase.cfm in your webroot and code:

<cfquery name="test" datasource="cfbookclub" >
select books.title
from app.books books
inner join app.authors authors on books.authorid=authors.authorid
where authors.lastname =
<cfqueryparam cfsqltype="cf_sql_varchar" value="Miro" />
</cfquery>

<cfdump var="#test#" />

Run it and you should see CF8's new query dump format which gives you metadata about the query including execution time.

Creating Embedded Databases
To create a new embedded database, enter the directory where you want the database files kept. Do not create a new directory yourself and then browse to it. Select or enter the directory you'd like to contain the database subdirectory. Now write the subdirectory name you'd like after this. For example, Browse to "C:\ColdFusion8\db\" then enter "mytestdatabase" in the entry box. The Database Folder field now reads "C:\ColdFusion8\db\mytestdatabase". (Figure 1)

If you're creating a new Derby database, open the Advanced tab and enter 'create=true' in the Connection String field. If the directory specified already exists and doesn't contain a Derby database, datasource creation will fail writing an error 'XBM0J' to the Derby log file (in /ColdFusion8/logs). (Figure 2)

It's not great interface design to have the file browser come up to help you locate the target directory when the activity fails if the directory already exists and doesn't contain a Derby database. The only time this will work is when you point to a directory that does contain a Derby database. If you want to create a datasource for a Derby database someone has given you, you can point the file browser at the directory that contains it. You must still open the Advanced tab and enter 'create=true' in the Connection String field. (Figure 3)

The ColdFusion server doesn't seem to like to let go of Derby embedded databases once you connect to them. Restarting the CF service is very slow after creating and verifying the new embedded Derby database. This is a bit problematical since it currently appears that the Advanced Options "Maintain connections across client requests," "Timeout," and "Interval" don't work: connections are maintained indefinitely. Restarting the server is the only way to release a connection. You can't have multiple connections open to an embedded database, so you can't use other tools (such as Eclipse or ij, discussed below) to work with it while running your CF application. This is one of many good reasons to think about using Derby Network instead.

Creating Network Databases
Creating a Derby network database is just as easy. First start up the Derby server: "java -jar /ColdFusion8/lib/derbynet.jar -start." Now go to CF Administrator and create a new Derby client datasource. There's currently a bug in this dialog, so in the Advanced/Connection String box, you'll have to start with a semicolon ";create=true" to get it to work. Hit submit and your new database directory will be created in the same directory in which the server started up (/ColdFusion8/lib). There's nothing to say that you have to run the Derby server on the same box as CF, in fact if you want your app to scale across multiple servers it's better not to.

Installing a Derby Network Server
While CF8 ships with the latest Derby (10.2.2), Adobe's not going to notify you when new features or minor patches come out. You'll have to go to Apache to keep up-to-date. (http://db.apache.org/derby/derby_downloads.html.) Download the latest version and unpack it on the server of your choice. Set the JAVA_HOME environment variable to the location of your Java runtime. If you want to use the runtime shipping with the CF server (JavaSE 1.6) to try this out, run 'set JAVA_HOME = [coldfusion install dir]\runtime' (Windows) or 'export JAVA_HOME="[coldfusion install dir]/runtime"' (*nix). (If you're smart and installing this on another machine, you should have downloaded the latest JRE from Sun and installed it there already.) Navigate to the Derby bin subdirectory and run the setNetworkServerCP script, which adds Derby's info to your CLASSPATH environment variable then run the startNetworkServer script. Scripts are included for *nix and Windows. Your Derby server will now tell you that it's listening on port 1527 and is ready to accept connections. When you use the ColdFusion Datasources dialog to tell the Derby server to make new databases (with the create=true directive), Derby will create new subdirectories in its startup directory (/Derby/bin directory) by default. When you want to stop your new server - you guessed it, run stopNetworkServer.


More Stories By Chip Temm

Over the past decade, Chip Temm moved from North America to Europe and on to Africa where his company anthroLogik solutions provided analysis and development services organizations across seven timezones. He is currently back in Washington, DC where "remote development" means working from home and "wildlife" means raccoon.

Comments (0)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


@ThingsExpo Stories
SYS-CON Events announced today the IoT Bootcamp – Jumpstart Your IoT Strategy, being held June 9–10, 2015, in conjunction with 16th Cloud Expo and Internet of @ThingsExpo at the Javits Center in New York City. This is your chance to jumpstart your IoT strategy. Combined with real-world scenarios and use cases, the IoT Bootcamp is not just based on presentations but includes hands-on demos and walkthroughs. We will introduce you to a variety of Do-It-Yourself IoT platforms including Arduino, Raspberry Pi, BeagleBone, Spark and Intel Edison. You will also get an overview of cloud technologies s...
SYS-CON Events announced today that SafeLogic has been named “Bag Sponsor” of SYS-CON's 16th International Cloud Expo® New York, which will take place June 9-11, 2015, at the Javits Center in New York City, NY. SafeLogic provides security products for applications in mobile and server/appliance environments. SafeLogic’s flagship product CryptoComply is a FIPS 140-2 validated cryptographic engine designed to secure data on servers, workstations, appliances, mobile devices, and in the Cloud.
The WebRTC Summit 2014 New York, to be held June 9-11, 2015, at the Javits Center in New York, NY, announces that its Call for Papers is open. Topics include all aspects of improving IT delivery by eliminating waste through automated business models leveraging cloud technologies. WebRTC Summit is co-located with 16th International Cloud Expo, @ThingsExpo, Big Data Expo, and DevOps Summit.
Containers and microservices have become topics of intense interest throughout the cloud developer and enterprise IT communities. Accordingly, attendees at the upcoming 16th Cloud Expo at the Javits Center in New York June 9-11 will find fresh new content in a new track called PaaS | Containers & Microservices Containers are not being considered for the first time by the cloud community, but a current era of re-consideration has pushed them to the top of the cloud agenda. With the launch of Docker's initial release in March of 2013, interest was revved up several notches. Then late last...
SOA Software has changed its name to Akana. With roots in Web Services and SOA Governance, Akana has established itself as a leader in API Management and is expanding into cloud integration as an alternative to the traditional heavyweight enterprise service bus (ESB). The company recently announced that it achieved more than 90% year-over-year growth. As Akana, the company now addresses the evolution and diversification of SOA, unifying security, management, and DevOps across SOA, APIs, microservices, and more.
After making a doctor’s appointment via your mobile device, you receive a calendar invite. The day of your appointment, you get a reminder with the doctor’s location and contact information. As you enter the doctor’s exam room, the medical team is equipped with the latest tablet containing your medical history – he or she makes real time updates to your medical file. At the end of your visit, you receive an electronic prescription to your preferred pharmacy and can schedule your next appointment.
GENBAND has announced that SageNet is leveraging the Nuvia platform to deliver Unified Communications as a Service (UCaaS) to its large base of retail and enterprise customers. Nuvia’s cloud-based solution provides SageNet’s customers with a full suite of business communications and collaboration tools. Two large national SageNet retail customers have recently signed up to deploy the Nuvia platform and the company will continue to sell the service to new and existing customers. Nuvia’s capabilities include HD voice, video, multimedia messaging, mobility, conferencing, Web collaboration, deskt...
The Open Compute Project is a collective effort by Facebook and a number of players in the datacenter industry to bring lessons learned from the social media giant's giant IT deployment to the rest of the world. Datacenters account for 3% of global electricity consumption – about the same as all of Switzerland or the Czech Republic -- according to people I met at the recent Open Compute Summit in San Jose. With increasing mobility at the edge of the cloud and vast new dataflows being predicted with the growth of the Internet of Things (and The Coming Age of Many Zettabytes) in the near...
The list of ‘new paradigm’ technologies that now surrounds us appears to be at an all time high. From cloud computing and Big Data analytics to Bring Your Own Device (BYOD) and the Internet of Things (IoT), today we have to deal with what the industry likes to call ‘paradigm shifts’ at every level of IT. This is disruption; of course, we understand that – change is almost always disruptive.
SYS-CON Events announced today that Cisco, the worldwide leader in IT that transforms how people connect, communicate and collaborate, has been named “Gold Sponsor” of SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Cisco makes amazing things happen by connecting the unconnected. Cisco has shaped the future of the Internet by becoming the worldwide leader in transforming how people connect, communicate and collaborate. Cisco and our partners are building the platform for the Internet of Everything by connecting the...
SYS-CON Media announced today that @WebRTCSummit Blog, the largest WebRTC resource in the world, has been launched. @WebRTCSummit Blog offers top articles, news stories, and blog posts from the world's well-known experts and guarantees better exposure for its authors than any other publication. @WebRTCSummit Blog can be bookmarked ▸ Here @WebRTCSummit conference site can be bookmarked ▸ Here
Temasys has announced senior management additions to its team. Joining are David Holloway as Vice President of Commercial and Nadine Yap as Vice President of Product. Over the past 12 months Temasys has doubled in size as it adds new customers and expands the development of its Skylink platform. Skylink leads the charge to move WebRTC, traditionally seen as a desktop, browser based technology, to become a ubiquitous web communications technology on web and mobile, as well as Internet of Things compatible devices.
SYS-CON Events announced today that robomq.io will exhibit at SYS-CON's @ThingsExpo, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. robomq.io is an interoperable and composable platform that connects any device to any application. It helps systems integrators and the solution providers build new and innovative products and service for industries requiring monitoring or intelligence from devices and sensors.
Docker is an excellent platform for organizations interested in running microservices. It offers portability and consistency between development and production environments, quick provisioning times, and a simple way to isolate services. In his session at DevOps Summit at 16th Cloud Expo, Shannon Williams, co-founder of Rancher Labs, will walk through these and other benefits of using Docker to run microservices, and provide an overview of RancherOS, a minimalist distribution of Linux designed expressly to run Docker. He will also discuss Rancher, an orchestration and service discovery platf...
Sonus Networks introduced the Sonus WebRTC Services Solution, a virtualized Web Real-Time Communications (WebRTC) offer, purpose-built for the Cloud. The WebRTC Services Solution provides signaling from WebRTC-to-WebRTC applications and interworking from WebRTC-to-Session Initiation Protocol (SIP), delivering advanced real-time communications capabilities on mobile applications and on websites, which are accessible via a browser.
SYS-CON Events announced today that Aria Systems, the leading innovator in recurring revenue, has been named “Bronze Sponsor” of SYS-CON's @ThingsExpo, which will take place on June 9–11, 2015, at the Javits Center in New York, NY. Proven by the world’s most demanding enterprises, including AAA NCNU, Constant Contact, Falck, Hootsuite, Pitney Bowes, Telekom Denmark, and VMware, Aria helps enterprises grow their recurring revenue businesses. With Aria’s end-to-end active monetization platform, global brands can get to market faster with a wider variety of products and services, while maximizin...
SYS-CON Events announced today that Vitria Technology, Inc. will exhibit at SYS-CON’s @ThingsExpo, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Vitria will showcase the company’s new IoT Analytics Platform through live demonstrations at booth #330. Vitria’s IoT Analytics Platform, fully integrated and powered by an operational intelligence engine, enables customers to rapidly build and operationalize advanced analytics to deliver timely business outcomes for use cases across the industrial, enterprise, and consumer segments.
SYS-CON Events announced today that Akana, formerly SOA Software, has been named “Bronze Sponsor” of SYS-CON's 16th International Cloud Expo® New York, which will take place June 9-11, 2015, at the Javits Center in New York City, NY. Akana’s comprehensive suite of API Management, API Security, Integrated SOA Governance, and Cloud Integration solutions helps businesses accelerate digital transformation by securely extending their reach across multiple channels – mobile, cloud and Internet of Things. Akana enables enterprises to share data as APIs, connect and integrate applications, drive part...
SYS-CON Events announced today that Solgenia will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY, and the 17th International Cloud Expo®, which will take place on November 3–5, 2015, at the Santa Clara Convention Center in Santa Clara, CA. Solgenia is the global market leader in Cloud Collaboration and Cloud Infrastructure software solutions. Designed to “Bridge the Gap” between Personal and Professional Social, Mobile and Cloud user experiences, our solutions help large and medium-sized organizations dr...
SYS-CON Events announced today that Liaison Technologies, a leading provider of data management and integration cloud services and solutions, has been named "Silver Sponsor" of SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York, NY. Liaison Technologies is a recognized market leader in providing cloud-enabled data integration and data management solutions to break down complex information barriers, enabling enterprises to make smarter decisions, faster.