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Now that you ve played with all the data providers that access SQL Server (the SQL Server CE data provider is beyond the scope of this book), let s make sure you clearly understand what a data provider is.

The pam_warn module is particularly useful with log errors: its primary purpose is to enable logging information about proposed authentication or password modification. For example, it can be used in conjunction with the pam_deny module to log information about users trying to connect to your system.

You use the MIN and MAX functions to find the minimum and maximum values, the SUM function to calculate the total value, and the AVG function to calculate the average value: min(UnitPrice) as "Min", max(UnitPrice) as "Max", Sum(UnitPrice) as "Sum", Avg(UnitPrice)as "Avg" Since you want the results listed by SalesOrderID, you use the GROUP BY clause. From the result set, you see that order 1 had a minimum unit price of 5.1865, a maximum unit price of 2039.994, a total unit price of 14323.7118, and an average unit price of 1193.6426.

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The NET Framework data providers, sophisticated as they are (and you ll learn plenty about exploiting their sophistication later), are simply APIs for accessing data sources, most often relational databases (ADONET is essentially one big API of which data providers are a major part) Newcomers to ADONET are often understandably confused by the Microsoft documentation They read about Connection, Command, DataReader, and other ADONET objects, but they see no classes named Connection, Command, or DataReader in any of the ADONET namespaces The reason is that data provider classes implement interfaces in the SystemData namespace These interfaces define the data provider methods of the ADONET API The key concept is simple A data provider, such as SystemDataSqlClient, consists of classes whose methods provide a uniform way of accessing a specific kind of data source.

Once upon a time, if the system administrator wanted to perform his administration tasks, he would do that as root However, this has some security risks, the most important of which is that you might make a mistake and thus by accident remove everything from your server Therefore, on Ubuntu Server, the root account is disabled by default It doesn t even have a password, so you cannot log in as root after a default installation To perform tasks for which root privileges are required, use the sudo mechanism instead The idea of sudo is that specific administrator tasks can be defined for specific users If one such user wants to execute one of the sudo commands that she has been granted access to, she has to run it with sudo.

In this chapter you used three different data providers (SQL Server, OLE DB, and ODBC) to access the same SSE database The only real difference in the code was the connection string Except for choosing the appropriate data provider, the rest of the programming was effectively the same This is true of all ADONET facilities, whatever kind of data source you need to access The SQL Server data provider is optimized to access SQL Server and can t be used for any other DBMS The OLE DB data provider can access any OLE DB data source and you used it without knowing anything about OLE DB (a major study in itself) The ODBC data provider lets you use an even older data access technology, again without knowing anything about it.

Specifies the name of the computer running the instance of SQL Server that generated the exception. Specifies the name of the provider that generated the exception. Defines a string representation of the call stack when the exception was thrown. Specifies a numeric error code from SQL Server that represents an exception, warning, or no data found message. For more information, see SQL Server Books Online. Represents the method that throws the current exception.

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