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11.2 R olling your ow n continuous database integration
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One of the easiest ways to get started with continuous database integration is to use SSMS. After you install it, it gives you everything you need to write scripts to maintain your database. Start by logging in to your SQL Server. Right-click the Pubs database, and select Script Database As. You can save the script into a file or open it in SSMS for editing (see figure 11.1). After you ve created a script file for the database, you should create one for each table and other database objects so they can be created programmatically. You should create a new table from scratch, one that doesn t exist in the database. How about a States table to use as validation Make sure the Database drop-down in the toolbar is set to Pubs, and click the New Query button. Enter the script in the next listing into the script editor.
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Figure 11.1 You can create a script file for each object in your database. This is an easy way to get started with database scripts.
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Listing 11.1 SQL script to create the States table
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USE [pubs] GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO SET ANSI_PADDING ON GO CREATE TABLE [dbo].[states]( [states_id] [char] (4) NOT NULL, [abbrev] [char](2) NOT NULL, [state_name] [varchar](40) NULL, CONSTRAINT [UPK_statesid] PRIMARY KEY CLUSTERED ( [states_id] ASC ) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY] GO SET ANSI_PADDING OFF GO
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Selects database
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Creates table
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The script first ensures that the proper database is selected B. The table is created along with a primary, clustered index C. You can run the script directly inside SSMS: click the Execute button on the toolbar. After it completes successfully, save the script. That was fun, wasn t it But you can hardly expect to have to run the script manually every time you want to create the table. Before we show you how to automatically run the script, delete the States table you just created so that you can re-create it outside of SSMS. To run the script, you ll use the SQL Server command-line utility. Launch a command prompt, and navigate to the folder where you saved the States.sql script. Type sqlcmd -S[database server name] -iStates.sql. The i specifies the input file. The script runs, and the States table is added to the Pubs database. All you need to do to create the database is run the scripts in order or create a single script that does everything. Inside your CI process, you run sqlcmd with the proper script files as input. Now that you have an idea how to automatically run database-maintenance scripts, let s look at a tool to make all this easier. It s called RoundhousE.
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11.3 Continuous database m aintenance w ith R oundhousE
If you ve ever seen a Chuck Norris movie, you know what a roundhouse is. Chuck is known for his roundhouse kicks. In fact, his blurred image is used as the logo for the RoundhousE project. According to Wikipedia.org, a roundhouse is a kick in which the attacker swings his leg around in a semicircular motion, striking with the front of the leg or foot. What does this have to do with database maintenance The RoundhousE home page (http://code.google.com/p/roundhouse/) says RoundhousE is an automated database deployment (change management) system that allows you to use your current idioms and gain much more. It seeks to solve both maintenance concerns and ease of deployment. In other words, it provides a knockout kick for database maintenance. And because it s an open source project, you can use it free of charge. You should be aware that RoundhousE isn t as feature-rich as Visual Studio. It doesn t support database unit testing or creating test data. What RoundhousE will do is help you with database migration, which means upgrading and making changes to the database. It does this through Windows batch files and SQL scripts. After you download and unzip RoundhousE, you re ready to get started. A good place to begin is the sample apps that ship with RoundhousE. But take note that many of the samples use NAnt to show you how to integrate with your CI solution. If you drill down to the RoundhousE\Sample\Deployment folder, you ll find several .bat files. LOCAL.DBDeployment.bat is a good one to start with.
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