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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.

example, you may want to run one statement at a time. Use the mouse to select the statements you want to run, and press F5.

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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

To use the ExecuteReader method, follow these steps: 1. Add a Visual Basic Console Application project named CommandReader to the 06 solution. 2. Replace the code in Module1.vb with the code in Listing 6-3.

The statements that you run with either the i switch or the :r keyword can generate richly structured data with multiple columns, each having many rows. You can also generate output with multiple result sets based on multiple SELECT statements. In fact, whether or not you use the i switch or the :r keyword, you can produce richly structured data as output from a sqlcmd session. Your output s complexity is limited only by your ability to construct output with T-SQL statements. One way of handling relatively rich output is to save it to a file. Saving your sqlcmd output to a file offers at least three benefits. First, you can edit and format the returned values with any application that can read a .txt file. Second, you can review the return values from the session without having to rerun the statements that create the output. Third, you can mail the output as an attachment to an e-mail message or even copy the output to the message body. You can save the output from a sqlcmd session by adding the o switch to the sqlcmd statement that launches a session. The argument value for the switch is the path and file name in which you want to store the output from a session. A very common file type for saving output is .rpt, but any

Imports System Imports System.Data Imports System.Data.SqlClient Module Module1 Sub Main() ' Set up connection string

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