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This is similar to the issue you d run into using stored procedures that return rowsets with LINQ to SQL; the designer generates a named type for the first rowset based on the shape of the first result set that a stored procedure returns, and doesn t generate anything for the additional result sets in a multiple result set procedure It s a good practice to handcode named types for the multiple result set procedure yourself Using rowset-returning procedures with EF forces you to define a class to contain the rowset produced, and aside from the extra work involved because the EF designer doesn t do this automatically, that s a good idea But EF can t use procedures that return more than one rowset (SqlDataReaderNextResult in ADONET).

Q: A:

How does this style relate to covering indexes An overly-simplistic definition of a covering index would be nonclustered index defined over the set of columns used by one table in a projection These indexes make for nicely optimized query plans, and sometimes even help with concurrency issues in SELECTs But if we re always doing SELECT * FROM, forget those covering indexes The index used most commonly is the clustered index on the base table You shouldn t define a covering index for every projection just because you can Every index consumes space and affects the performance of inserts, updates, and deletes; therefore, there s a tradeoff In fact, I ve also heard it said that if you need many, many covering indexes, perhaps your database isn t as well normalized as it could be, but I m not really sure I buy this argument..

I d say that the ease with which every projection can become a SELECT * FROM query when using objects is, for the most point, a valid worry. If you re concerned about database performance, you need to do coding beyond what the APIs provide.

In Chap 19, you learned that a diode will not conduct until the forward-bias voltage is at least as great as the forward breakover voltage There s a corollary to this: a diode will always conduct when the forward-bias voltage reaches or exceeds the forward breakover voltage, when the device is conducting current in the forward direction In the case of silicon diodes this is approximately 06 V For germanium diodes it is about 03 V, and for selenium diodes it is about 1 V This phenomenon can be used to advantage when it is necessary to limit the amplitude of a signal, as shown in Fig 20-8 By connecting two identical diodes back-to-back in parallel with the signal path (A), the maximum peak amplitude is limited, or clipped, to the forward breakover voltage of the diodes The input and output waveforms of a clipped signal are illustrated at B This scheme is sometimes used in radio receivers to prevent blasting when a strong signal comes in The downside of the diode limiter circuit, such as the one shown in Fig 20-8, is the fact that it introduces distortion when clipping occurs This might not be a problem for reception of digital signals, for frequency-modulated signals, or for analog signals that rarely reach the limiting voltage But for amplitude-modulated signals with peaks that rise past the limiting voltage, it can cause trouble

Okay, I ll bite: What is the carriage return character that Table 5-1 mentions Quick warning: You may regret that you asked this When you press RETURN in AppleScript Editor, you get a linefeed character so what s a carriage return character In ASCII, a linefeed character has the value 10, and a carriage-return character has the value 13 In many applications, these two characters have the same effect, and you can use the two interchangeably which is handy but continues the confusion But you ll find that other applications treat a carriage return differently from a linefeed so if your code isn t able to identify the end of a paragraph, you may need to use the other character Some Windows programs even use both a carriage return and a linefeed at the end of paragraphs

CONCERN Using LINQ to SQL and EF will encourage SELECT to middle-tier, then UPDATE or DELETE rather than issuing SQL UPDATE or DELETE statements that are set-based.