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Listing 12-14. Creating a Simple Job package com.apress.prospring2.ch12.quartz; import org.quartz.Job; import org.quartz.JobExecutionContext; import org.quartz.JobExecutionException; public class HelloWorldJob implements Job { public void execute(JobExecutionContext context) throws JobExecutionException { System.out.println("Hello World!"); } } To schedule this job to run, we first need to obtain a Scheduler instance, then create a JobDetail bean that contains information about the job, and finally create a Trigger to govern job execution. The code for this is shown in Listing 12-15. Listing 12-15. Scheduling Jobs in Quartz package com.apress.prospring2.ch12.quartz; import java.util.Date; import import import import import org.quartz.JobDetail; org.quartz.Scheduler; org.quartz.SimpleTrigger; org.quartz.Trigger; org.quartz.impl.StdSchedulerFactory;

his chapter is where the payoff happens: where you can put all your knowledge to work for you. One of the reasons I spent the past few hundred pages concentrating on the technical is that by the time you got here, you would understand how each of the technologies works, as well as their deployment, implementation, and administration. Without that foundation, you cannot even begin to put together your solution. This chapter will do its best to convey the thought processes that I go through when working with clients, but it is hard to cram all my years of experience into a few pages of text. This chapter will not cover every single individual SQL Server feature such as Notification Services and SSIS. I am focusing more on the database and full instance level, which is where most people need the protection.

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public class HelloWorldScheduling { public static void main(String[] args) throws Exception { Scheduler scheduler = new StdSchedulerFactory().getScheduler(); scheduler.start(); JobDetail jobDetail = new JobDetail("helloWorldJob", Scheduler.DEFAULT_GROUP, HelloWorldJob.class); Trigger trigger = new SimpleTrigger("simpleTrigger", Scheduler.DEFAULT_GROUP, new Date(), null, SimpleTrigger.REPEAT_INDEFINITELY, 3000); scheduler.scheduleJob(jobDetail, trigger); } } This code starts by obtaining an instance of Scheduler using the StdSchedulerFactory class. We are not going to look at this class in any detail here, but you can find out more information in the Quartz tutorial, which is available on the OpenSymphony web site. For now, it is enough to know that the StdSchedulerFactory.getScheduler() class returns a Scheduler instance that is ready to run. In Quartz, a Scheduler can be started, stopped, and paused. If a Scheduler has not been started or is paused, no triggers fire, so we start the Scheduler using the start() method.

Listing 2-1 displays the code to create the sp_fieldinfo stored procedure. You can find the code for this query in the code download file in the SQL Queries folder. The file is called CreateFieldInfo.sql. Listing 2-1. Creating the sp_fieldinfo Stored Procedure IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[sp_FieldInfo]')) DROP PROCEDURE [dbo].[sp_FieldInfo] Go CREATE PROCEDURE sp_FieldInfo ( @column_name nvarchar(384) = NULL ) AS SELECT

Next, we create the JobDetail instance of the job we are scheduling, passing in three arguments to the constructor The first argument is the job name and refers to this job when using one of the Scheduler interface s administration methods, such as pauseJob(), which allows a particular job to be paused The second argument is the group name, for which we are using the default Group names can be used to refer to a group of jobs together, perhaps to pause them all using SchedulerpauseJobGroup() You should note that job names are unique within a group The third and final argument is the Class that implements this particular job With the JobDetail instance created, we now move on to create a Trigger In this example, we use the SimpleTrigger class, which provides JDK Timer-style trigger behavior.

If I had a dollar for every time I m asked by a customer what they should use to make their SQL Servers highly available, I d be independently wealthy The answer is the one I keep stressing all throughout this book: it depends on your situation I apologize to those who may be a bit put off by that, but it is 100% honest No one technology is necessarily better than another; it just depends on what you are trying to achieve and what rules govern your implementation Before I give any examples or implementation considerations, you will notice that I pretty much avoided direct technology comparisons in the other chapters That was on purpose; I wanted the comparison piece of the puzzle to be presented in one place, after you have a full understanding of the various individual technologies.

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