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In this chapter, we covered quite a few things: What an ADO.NET command is and does How to create a command How to associate a command with a connection How to set command text How to use ExecuteScalar() for queries that return single values How to use ExecuteReader() to process result sets How to use ExecuteNonQuery() for statements What command parameters are and how to use them How to use the Prepare method In the next chapter, we ll look at data readers.

The most important of these are the Korn shell (/bin/ksh), which is the default shell on Sun Microsystems Solaris An open source derivative of that shell is available as the Public Domain Korn Shell /bin/pdksh Another popular shell is the C shell, which on Linux exists as /bin/tcsh The C shell is especially popular among C programmers because it has a scripting language that closely resembles the C programming language You ll sometimes encounter C shell users in a Linux environment The Korn shell, however, is not used often in Linux environments because almost all of its important features are offered by Bash as well Both the Korn shell and the C shell are incompatible with Bash, and this incompatibility could prevent you from running a C shell script in a Bash environment However, there is a solution, and that s to include the so-called shebang in your shell script.

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n 4 you used data readers to retrieve data from a multirow result set. In this chapter, we ll look at data readers in more detail. You ll see how they re used and their importance in ADO.NET programming. In particular, you ll see how to use data readers to: Retrieve query results Get information with ordinal and column name indexers Get result set information Get schema information Process multiple result sets

s Note We don t cover sqlcmd further, since we submit SQL with SQL Server Management Studio Express

The third component of a data provider, in addition to connections and commands, is the data reader. Once you ve connected to a database and queried it, you need some way to access the result set. This is where the data reader comes in.

This is an indicator of the program that must be used when executing the script The shebang consists of the pound sign (#), followed by an exclamation mark, followed by the name of the required command interpreter If the program that is referred to by the shebang is present on your system, the.

s Note If you re from an ADO background, an ADO.NET data reader is like an ADO forward-only/read-only

from this point on, but we recommend you play with it. It s the latest command-line tool for SQL Server, superseding the earlier osql and isql tools, and it s still a very valuable tool for database administrators and programmers.

The ifup and ifdown commands make managing a network board easy, and these tools are simple: call the tool followed by the name of the network board that you want to manage. For example, ifup eth0 starts network card eth0 and ifdown eth0 stops it again. Another useful tool to manage the network card is ifplugstatus, which shows the state of a network interface. As seen in Listing 8-3, this utility shows if a link is detected on a network interface. (If the ifplugstatus utility hasn t been installed yet, use apt-get install ifplugd.) Listing 8-3. The ifplugstatus Tool Shows the Current Connection State of a Network Board. root@RNA:/# ifplugstatus lo: link beat detected eth0: link beat detected

Data readers are objects that implement the System.Data.IDataReader interface. A data reader is a fast, unbuffered, forward-only, read-only connected stream that retrieves data on a per-row basis. It reads one row at a time as it loops through a result set.

The ifconfig command is used to manage a network interface card. The command has been around for years and so it s not the most flexible command, but it ll still do the job. If you just use the ifconfig command without any parameters, you ll see information about the current configuration of the network cards in your server. You saw an example of this in Listing 8-2.

You can t directly instantiate a data reader; instead, you create one with the ExecuteReader method of a command. For example, assuming cmd is a SqlClient command object for a query, here s how to create a SqlClient data reader:

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