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and it would still run as expected, but now you ve added an unnecessary call to Prepare(). Further, the prepared command is discarded when you change the CommandText before performing the DELETE:

Before you start writing shell scripts, you should ask yourself if a shell script is really the best solution. In many cases, other approaches are available and maybe even preferable. Instead of using the Bash shell as your scripting language, you can use Perl or write a complete program in C. Each of these solutions has its advantages and disadvantages.

To make sure the Northwind sample database has been created successfully, try accessing it. You ll use sqlcmd interactively. 1. At the command prompt, enter the following command, which runs sqlcmd and connects to the SQLEXPRESS instance (see Figure 1-6): sqlcmd -S .\sqlexpress

because the new SQL statement is different (though it still uses the same parameters and they stay in effect).

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That said, Bash offers some important advantages as a scripting language: Bash scripts are relatively easy to understand and to write. You don t have to compile a Bash script before you can start using it. The only thing you need on the computer where you are going to run your shell script is the shell for which the script is written. The Bash shell is omnipresent, and so it s no problem performing tasks with your script on other Linux computers as well. A shell script is platform independent. You can run the same script on a Solaris machine, a Power PC, or an Intel machine. It just doesn t matter. Although Bash is almost always present, you can get even greater portability by using the Bourne shell (/bin/sh) instead of Bash. Bourne shell scripts run on any flavor of Linux and even different brands of UNIX, without the need to install anything else on your server. The most important disadvantage of using Bash to create your script, however, is that it is relatively slow. It s slow because the shell always has to interpret the commands that it finds in the script before it can do its job. For contrast, a C program is compiled code, optimized to do its work on the hardware of your computer directly and therefore is much faster. Of course, it s also much more difficult to create such a program.

s If you prepare commands, use them for only one SQL query or statement. Create as many command Tip

2. At the sqlcmd prompt (1>), enter the following T-SQL: use northwind select count(*) from employees go The first two lines are T-SQL statements: USE specifies the database to query, and SELECT asks for the number of rows in the Employees table. GO is not a T-SQL statement but a sqlcmd command that signals the end of the T-SQL statements to process. The result, that there are nine rows in Employees, is shown in Figure 1-7.

Summary

Many shells are available for Linux When writing a shell script, you should be aware of that and choose the best shell for your script A script written for one shell will not necessarily run on another shell as well Fortunately, the choice is relatively easy because Bash (/bin/bash) is the default shell on Linux Bash is compatible with the UNIX Bourne shell /bin/sh, which has been used on UNIX since the 1970s The good thing about that compatibility is that a script that was written to run on /bin/sh will work on Bash as well However, the opposite is not necessarily true because many new features have been added to Bash that don t exist in the traditional UNIX Bourne shell You ll likely occasionally encounter Linux shells other than Bash.

Figure 1-7. Running a simple query against the Northwind database 3. Enter the sqlcmd command quit to exit sqlcmd (see Figure 1-8).

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