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The ERROR_NUMBER() function returns the error number that caused the code to jump into this CATCH block. This value will not change for the duration of the CATCH block. You can see a list of system messages and errors in sys.messages. The ERROR_MESSAGE() function returns the text of the error that caused the code to jump into the CATCH block. For system errors this value can also be found in sys.messages. The ERROR_MESSAGE() function will return the message with any parameters expanded. You can return the severity of the error using the ERROR_SEVERITY() function. TRY...CATCH blocks behave differently depending on the severity of the error. Errors (or messages) with a severity of 10 or less don t cause the CATCH block to fire. These are typically informational messages. Error severities of 11 or higher will cause the CATCH block to fire unless the error terminates the connection. Error severities from 11 to 16 are typically user or code errors. Severity levels from 17 to 25 usually indicate a software or hardware problem, where processing may be unable to continue. Books Online has a detailed description of each severity under the heading Database Engine Error Severities.

The ERROR_STATE() function can be used to determine the error state. Some system error messages can be raised at different points in the SQL Server engine. SQL Server uses the error state to differentiate when these errors are raised. The last two properties of an error are the line number and the name of the stored procedure where the error occurred. These can be returned using the ERROR_LINE() function and the ERROR_PROCEDURE() function, respectively. The ERROR_PROCEDURE() function will return NULL if the error occurs outside a stored procedure. Listing 4 is an example of these last two functions inside a stored procedure.

Meanwhile, as a result of this minicrash, new rules were proposed to level the playing field For many Wall Street oldtimers, it probably feels like d j vu Although a flash crash is a relatively rare event, the promised reforms never seem to get past the various financial committees In 2010, however, the SEC and CFTC (Commodity Futures Trading Commission) issued a joint report blaming the Flash Crash on a computerized trading program that automatically sold 35,000 e-mini S&P 500 futures contracts Eventually, new regulations will most likely be enacted, probably after the next crash Ironically, it makes many yearn for the days when market makers and specialists controlled order flow, and the bid-ask spread was in fractions, not decimals In the opinion of this author, the last thing the market needs is the perception that a Wizard of Oz character is manipulating the markets behind the scenes The sooner regulations are passed to make the markets fair for retail investors, the better

To open a new window on a workbook, use the new window on workbook command This command takes the workbook parameter with the workbook for which you want the new window For example, the following statement opens a new window on the workbook named Migration Patternsxlsx:

CREATE PROCEDURE ChildError AS BEGIN RAISERROR('My Error', 11, 1) END GO CREATE PROCEDURE ParentError AS BEGIN EXEC ChildError END GO BEGIN TRY EXEC ParentError END TRY BEGIN CATCH SELECT Error_Line = ERROR_LINE(), Error_Proc = ERROR_PROCEDURE() END CATCH

This returns the following result:

new window on workbook workbook "Migration Patternsxlsx"

My next guest, William J O Neil, bestselling author and founder of Investor s Business Daily, stopped by to share some of the lessons he has learned about being a successful trader and investor

The RAISERROR function can be used to generate SQL Server errors and initiate any error processing. The basic use of RAISERROR for a dynamic error looks like this:

What you ll normally want to do is assign the new window to a variable so that you can easily resize or reposition it, as discussed later in this section For example, the following statement assigns the new window created by the new window on workbook command to the variable myWindow:

RAISERROR('Invalid Customer', 11, 1)

William J O Neil, chairman and founder of Investor s Business Daily and Investorscom, has made a career of correctly anticipating stock market direction When he first became interested in the stock market in the 1960s, he spent two years studying and researching how to be a successful trader Because he had done his homework, he identified signals that a powerful bull market was about to begin As a result, O Neil turned $5,000 into $250,000 with a trio of exceptional trades He continued studying the market, eventually using what he learned about indicators to launch Investor s Business Daily The first book I read that helped me was The Battle for Investment Survival by Gerald Loeb, O Neil recalls Loeb was a tape reader He made $2 million pyramiding in Montgomery Ward while he was a young broker at EF Hutton I also met with him several times

This returns the following when run in SQL Server Management Studio:

set myWindow to new window on workbook workbook "Migration Patternsxlsx"