birt code 39

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1. In this example, we will take the first three characters from a local variable. Here we are taking the first three characters from Robin to return Rob: DECLARE @StringTest char(10) SET @StringTest = 'Robin ' SELECT LEFT(@StringTest,3) 2. As expected, you should get the results shown in Figure 11-28 when you execute the code.

The next buttons are concerned with executing the code entered in the Query Editor. The red exclamation mark and the Execute button execute the code. The green tick will parse the code, but will not actually run it. Parsing the code will not find every error that could occur but will ensure that the syntax is correct. The last option is a grayed-out button that turns red when code is executing. If you would like to send a cancel command to SQL Server, then press this button. This may not always instantly cancel the query, depending on what is executing and whether your server is local or remote. There will be a delay in sending the command and SQL Server pausing to receive the command.

issqluser ----------1 1 1 1

LOWER()

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The next two buttons help you analyze the T-SQL query for optimization. We won t look at this subject within this book.

In general, it is not a good practice to enable database access with the guest user account. The guest user does not allow you to fine-tune the permissions that you assign to individual logins that connect to a database through it. Every database can have just one guest user. Furthermore, any login without a user mapping to it connects to a database through the guest user. This feature makes it difficult to know who will connect to a database with whatever permissions you assign to the guest user. A much better practice is to create a user for a login and add the user to a fixed server role. The next sample illustrates this approach to granting database access. However, you should invoke the sp_dropuser 'guest' statement to disable the guest user before proceeding. The next script shows the syntax for creating a user, sqllogin1, which points at the sqllogin1 login. See the Creating Users section for an explanation of the CREATE USER statement syntax. The SELECT statements before and after the syntax for creating a fresh user based on the sqllogin1 login allow you to see the addition of a new user to the sys.sysusers view that has access to the current database namely, AdventureWorks. See the result sets from the SELECT statements following the script for creating the fresh sqllogin1 user. Notice the second result set adds a row for the sqllogin1 user that has 1 for its hasdbaccess column value.

To change alphabetic characters within a string, ensuring that all characters are in lowercase, you can use the LOWER() function.

SELECT name, hasdbaccess, isntuser, issqluser FROM sys.sysusers WHERE issqlrole = 0 IF EXISTS(SELECT * FROM sys.sysusers WHERE name = 'sqllogin1') DROP USER sqllogin1 GO CREATE USER sqllogin1 FOR LOGIN sqllogin1 WITH DEFAULT_SCHEMA = dbo GO SELECT name, hasdbaccess, isntuser, issqluser FROM sys.sysusers WHERE issqlrole = 0 name -----------------dbo guest INFORMATION_SCHEMA sys hasdbaccess ----------1 0 0 0 isntuser ----------0 0 0 0 issqluser ----------1 1 1 1

Rather than typing T-SQL code by hand, we can use a type of wizard that allows a query to be built up by selecting tables and columns via check boxes, and so on. Pressing the button shown in the following image brings up this wizard, known as the Query Design Editor, which you will see in action in 9.

Try It Out: LOWER()

hasdbaccess ----------1 0 0 0 1

The following button allows you to work with code templates. Templates feature the basics of commands or actions. They have options that act as default values. Pressing this button brings up a dialog box to change the values in each of a template s parameters.

isntuser ----------0 0 0 0 0

1. Our LOWER() example will combine this function along with another string function, LEFT(). Like all our functions, they can be combined together to perform several functions all at once. DECLARE @StringTest char(10) SET @StringTest = 'Robin ' SELECT LOWER(LEFT(@StringTest,3)) 2. As you can see, this results in showing rob in lowercase, as shown in Figure 11-29.

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