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CHAPTER 2 GRAPHICAL AND COMMAND-LINE QUERY TOOLS
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The CREATE LOGIN statement adds a new login to a SQL Server Express instance. See 8 for extensive discussion and demonstrations on how to use this T-SQL statement.
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You can work around the short input and output rule for the sqlcmd utility by using additional sqlcmd statement switches beyond those demonstrated already. When you need to run more than a couple of lines of statements, you can put the code into a file and then reference the file from a sqlcmd statement. There are two ways to accomplish this. First, you can use the i command-line switch following sqlcmd. The argument for the i switch is the path and file name containing the statements that you want to reference. There is no need to delimit the path and file with quotes (unless there are special characters, such as spaces, in a path name). Second, you can enter the :r sqlcmd keyword in response to a sqlcmd prompt, such as 1>. This keyword takes a string in double quotes to denote the path to a file. With either the i switch or the :r keyword, you can replace a set of statements with a single reference to a path and file. In fact, you can even debug the statements in Express SSMS and later run the statements in the file quickly and easily with the sqlcmd utility. The sqlcmd utility is ideally suited for rerunning a set of T-SQL statements whenever an IT professional or power user needs those statements run.
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Using the i Switch to Reference a File of Statements
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The statements in a file that you reference with the i switch can contain T-SQL statements, sqlcmd statements, or both types of statements. The three statements in Figure 2-5 start with the USE keyword to set the database context for two SELECT statements that follow it. The USE keyword is valid in both Express SSMS and the sqlcmd utility. The code portrayed in Figure 2-19 is saved as SQLQuery2_f0219.sql in the C:\ProSSEApps\02 path on my test computer. The command prompt window in Figure 2-26 shows the syntax for the i switch pointing at SQLQuery2_f0219.sql. Notice the statement s compact form. The statement has just two switches: one to denote a server instance name ( S) and another to denote a file with statements ( i). The argument for the i switch points at Query2_f0205.sql in its path on the C drive of the local computer. The code in SQLQuery2_f0219.sql changes the database context to AdventureWorks and runs two SELECT statements. The output, which appears below the sqlcmd statement, shows the outcome from each SELECT statement. When you use the i switch with a sqlcmd statement, the sqlcmd utility never presents a prompt for interactive use. Instead, the statements within the file pointed at by the i switch run, and control returns to another command prompt. You do not have to exit the sqlcmd utility to get to another command prompt.
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CHAPTER 2 GRAPHICAL AND COMMAND-LINE QUERY TOOLS
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Figure 2-26. Use the i switch in a sqlcmd statement to refer to a file with statements to run.
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The :r keyword operates from within the sqlcmd utility. When you run a statement with the keyword, control remains within the sqlcmd utility. Unlike statements with the :serverlist keyword, statements with the :r keyword do not automatically execute. You need to invoke the GO keyword to run a batch of statements that includes the :r keyword. It takes a minimum of two statements to run a statement with the :r keyword. The first statement starts with the keyword followed by the path and file name containing the T-SQL or sqlcmd statements that you wish to run. The path and file name must appear in double quotes. The following sample uses a script saved from Express SSMS with a .sql file extension. However, you are not restricted to reading from .sql files. For example, you can specify a .txt file type instead of a .sql file type. The essential point is that the file referenced by the :r keyword must contain valid T-SQL and sqlcmd statements. Unless you add a second line with the GO keyword, the code in the file pointed at by the :r statement will not execute. The following script excerpt shows necessary lines for running the code in SQLQuery2_f0219.sql. The statements generate output within the sqlcmd utility that looks like that within Figure 2-26. 1>:r "c:\prosseapps\chapter02\SQLQuery2_f0219.sql" 2>GO
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