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One of the critical components you need to include in your connection string is your application s or your user s credentials. You have two choices: Request a trusted connection. This approach captures the Windows user or IIS credentials and passes them to SQL Server for authentication. Supply a user ID and password that are passed to SQL Server for authentication. In either case you must create a login for the specified user or for the domain group that includes the user s Windows login ID unless you re connecting as the SQL Server system administrator or a member of the administrator s group.

Pascal Willain, formerly a mathematician and software engineer, lives in Brussels, Belgium, where he now trades full time Before becoming a trader, he had created, managed, and sold a number of information technology companies After retiring from his entrepreneurial activities, he started to invest his own funds in the market Willain was fortunate enough to start this activity in 2001 when stock prices started to be calculated in cents ($001), which was the trigger for the stating of highfrequency trading algorithms He discovered several groundbreaking trading algorithms that he has detailed in his book Value in Time: Better Trading through Effective Volume (Wiley, 2008) Willain s indicators are published each day on the wwweffectivevolumecom Web site

If you have Office 2008 Home & Student edition, your version of Entourage doesn t support Exchange accounts

there are rare exceptions, developers should never build or test applications using SA credentials. Let s visit each of these approaches in a bit more detail.

Microsoft seems to support the trusted approach for most production applications. I also endorse it, but with a few caveats. You enable the trusted security option by including Integrated Security=SSPI; or Trusted_Connection=True; in the connection string. After you do, keep in mind that the connection inherits the rights granted to the user. The user might be a human with domain or system login rights or a service (like the ASP.NET service running under IIS). In the case of IIS services you need to determine the version of IIS you re using to host the application making the connection and the username IIS is using to log into SQL Server. I discuss this in the next section. If the user has limited rights in the database, the application might not be able to access all of the data objects (like stored procedures, tables, views, or functions) that it needs to function properly. In addition, if the user has super rights, the application might have access to more data objects than necessary. The reason I mention this is that trusted security may open your database to Trojan attacks, where a block of SQL is embedded surreptitiously that can be executed only when a user with sufficient rights runs the program. When you use this approach, consider that each time your code opens a connection, the user credentials are verified. This also applies to pooled connections (as discussed in Connection pooling later in this chapter). Trusted connections are enabled by default when you install SQL Server, and cannot be disabled.

Apart from the shared properties shown in Table 16-1, the IMAP account object also has the properties explained in Table 16-3

Buying Power Index Lowry Research Corp, the oldest technical advisory firm in the United States, uses a proprietary volume indicator, Buying Power Index, to analyze market conditions Although the buying and selling pressure formula is a closely held secret, Lowry routinely publishes the results for individuals and institutions Back in the 1930s when Lowry first developed the formula, it calculated the results by hand Points were assigned for whether

MSP_EpmResource LEFT OUTER JOIN MSP_TimesheetResource INNER JOIN MSP_TimesheetActual ON MSP_TimesheetResource.ResourceNameUID = MSP_TimesheetActual.LastChangedResourceNameUID ON MSP_EpmResource.ResourceUID = MSP_TimesheetResource.ResourceUID LEFT OUTER JOIN MSP_TimesheetPeriod INNER JOIN MSP_Timesheet ON MSP_TimesheetPeriod.PeriodUID = MSP_Timesheet.PeriodUID

INNER JOIN MSP_TimesheetPeriodStatus ON MSP_TimesheetPeriod.PeriodStatusID = MSP_TimesheetPeriodStatus.PeriodStatusID INNER JOIN MSP_TimesheetStatus ON MSP_Timesheet.TimesheetStatusID = MSP_TimesheetStatus.TimesheetStatusID ON MSP_TimesheetResource.ResourceNameUID = MSP_Timesheet.OwnerResourceNameUID