c# itextsharp datamatrix Figure 3-12. The new database within Object Explorer in Visual C#.NET

Drawer Data Matrix in Visual C#.NET Figure 3-12. The new database within Object Explorer

Figure 3-12. The new database within Object Explorer
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CHAPTER 3 DATABASE DESIGN AND CREATION
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SQL Server Management Studio is simply a GUI front end to running T-SQL scripts in the background. As we progress through the book, you ll see the T-SQL generated for each object type we re using, as well as create the objects graphically, as you ve just seen. There are two methods you can use to get the script for this database: Notice that at the top of the database wizard screen is a button that generates the script. After you click this button, you can indicate where you would like the script sent to. Once the database has been created, you can right-mouse-click and, as shown in Figure 3-13, have the details sent to one of three locations.
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Figure 3-13. Scripting the database from SSMS Whichever method you choose to use, the script will be the same, with the exception of a comment line when you create the script in the second option. The script for generating the database from this option is listed here so we can go through what is happening. First of all, SQL Server points itself to a known database, as shown in the following snippet. master has to exist; otherwise, SQL Server will not work. The USE statement, which instructs SQL Server to alter its connection to default to the database after the USE statement, points further statements to the master database. USE [master] GO Next, the script builds up the CREATE DATABASE T-SQL statement built on the options selected. (We ll walk through the CREATE DATABASE syntax that could be used in the Creating a Database in a Query Pane section, as this statement doesn t cover all the possibilities.) Notice in the code that follows that the name of the database is surrounded by square brackets: []. SQL Server does this as a way of defining that the information between the square brackets is to be used similarly to a literal and not as a variable. Also it defines that the information is to be treated as one unit. To clarify, if we want to name the database Apress Financial (i.e., with a space between Apress and Financial ), then we need to have a method of knowing where the name of the database starts and ends. This is where the identifier brackets come in to play.
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CHAPTER 3 DATABASE DESIGN AND CREATION
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Note Recall the Quoted Identifier option that we encountered in 2, with the T-SQL command SET
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QUOTED_IDENTIFIER ON/OFF. Instead of using the square brackets, you can define identifiers by surrounding them with double quotation marks using this command. Therefore, anything that has double quotation marks around it is seen as an identifier rather than a literal, if this option is set to ON. To get around this requirement, you can use single quotation marks, as shown in the example, but then if you do have to enter a single quote mark as in the word don t you would have to use another single quotation mark. So as you can see, this situation can get a bit messy. I prefer to have QUOTED_IDENTIFIER set to OFF, to reduce confusion.
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/****** Object: Database [ApressFinancial] Script Date: 05/29/2005 14:14:35 ******/ CREATE DATABASE [ApressFinancial] ON PRIMARY ( NAME = N'ApressFinancial', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\ApressFinancial.mdf' , SIZE = 3072KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB ) LOG ON ( NAME = N'ApressFinancial_log', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\ApressFinancial_log.ldf' , SIZE = 1024KB , MAXSIZE = 2048GB , FILEGROWTH = 10%) COLLATE SQL_Latin1_General_CP1_CI_AS GO Have you noticed that every so often there is a GO command statement This signals to SQL Server or any other SQL Server utility that this is the end of a batch of T-SQL statements, and the utility should send the batch of statements to SQL Server. Certain statements need to be in their own batch and cannot be combined with other statements in the same batch. To clarify, a GO statement determines that you have come to the end of a batch of statements and that SQL Server should process these statements before moving on to the next batch of statements.
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Note GO statements are used only in ad hoc T-SQL, which is what I m demonstrating here. Later in the
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book, you ll build T-SQL into programs called stored procedures. GO statements are not used in stored procedures.
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Next, we define the new database s compatibility level. This statement defines that the database s base level is SQL Server 2005. It is possible to define SQL Server to an earlier level, as far back as SQL Server version 6.0, by changing the version number in the parameter @new_cmptlevel. You ll learn more about this code in 10. EXEC dbo.sp_dbcmptlevel @dbname=N'ApressFinancial', @new_cmptlevel=90 GO
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