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Create Data Matrix in C# DATABASE DESIGN AND CREATION

CHAPTER 3 DATABASE DESIGN AND CREATION
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It's now time to inspect the code entered into Query Analyzer that will create the ApressFinancial database. Commencing with CREATE DATABASE, you are informing SQL Server that the following statements are all parameters to be considered for building a new database within SQL Server. Some of the parameters are optional, and SQL Server will include default values when these parameters are not entered. But how does SQL Server know what values to supply Recall that at the start of this chapter we discussed the built-in SQL Server databases, specifically the model database. SQL Server takes the default options for parameters from this database unless they are otherwise specified. Thus, it is important to consider carefully any modifications to the model database. The database name is obviously essential, and in this case, ApressFinancial is the chosen name. The ON parameter provides SQL Server with specifics about the data files to be created, rather than taking the defaults. Admittedly in this instance, there is no need to specify these details, as by taking the defaults, SQL Server would supply the parameters as listed anyway. This can also be said for the next set of parameters, which deal with the Transaction Log found with LOG ON. In this instance, there is no need to supply these parameters, as again the listed amounts are the SQL Server defaults. Finally, the collation sequence we specify is actually the default for the server. Taking all this on board, the command could actually be entered as follows, which would then take all the default settings from SQL Server to build the database: CREATE DATABASE ApressFinancial We can then set the database options as outlined during the discussion of the script earlier in the chapter. Similarly, if we want to delete the database using T-SQL code, it s a simple case of ensuring that we are not connected within that particular query pane to ApressFinancial via the USE command. Then we use the command DROP followed by the object we want to drop, or delete, and then the name of the object. USE Master GO DROP DATABASE ApressFinancial
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In this chapter we looked at designing and building our example database. The steps covered are very important on the development front. The database itself requires careful thought regarding some of the initial settings, but as time moves on and you have a better idea about the volume of data and how people will use the data, you may find you need to alter some of these options. As you move to user acceptance testing, keep an eye on the statistic options mentioned here. In the next chapter, we ll start adding some meat to the bones of our example database by creating tables to hold data.
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ecurity is important more so, in fact, than design, creation, and performance. If your database had no security measures in place, absolutely anyone could come along and steal or corrupt the data, causing havoc to you and your company. And not just in one database, but on every database in every server. Security can be enforced in many ways on a SQL Server: by Windows itself through Windows authentication; by restricting users access to sensitive data through views; or by specifically creating users, logins, and roles that have explicit levels of access. This chapter covers some parts of security, although it is impossible to talk about every area of security, mainly because we haven t seen much of SQL Server s contents yet! In 1 we looked at the difference between Windows authentication and SQL Server authentication, so already you know your options with regard to the type of security you might wish to use. So what is next First of all, you need to understand what users, roles, and logins are.
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