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Note that the parameter length is seven characters exactly (the size of the string). If I replaced this with "where a.city = "Portland" " the result would be a parameterized query with a different string length (nvarchar(8)) for @p0. This pollutes the plan cache with one query for each different string size, when it s only necessary to use the field size of the city field (20 in this case). SQL Server s built-in auto-parameterization always uses the string length of 8000 characters or 4000 Unicode characters, and using one string size in the query parameter is preferable to one different query per string size. Both LINQ to SQL and the EF have addressed the parameter length issue in the upcoming .NET 4.0 release by choosing a default length when none is specified, but in the meantime, using these frameworks means making query plan reuse compromises.

Figure 5-1

you get back a nice, clean object instead of the less-useful anonymous type you receive by doing projection. This will also make covering indexes useless.

5:

The ability of diodes to conduct with forward bias, and to insulate with reverse bias, makes them useful for switching in some electronic applications Diodes can perform switching operations much faster than any mechanical device One type of diode, made for use as an RF switch, has a special semiconductor layer sandwiched in between the P-type and N-type material The material in this layer is called an intrinsic (or I-type) semiconductor The intrinsic layer (or I layer) reduces the capacitance of the diode, so that it can work at higher frequencies than an ordinary diode A diode with an I-type semiconductor layer sandwiched in between the P- and N-type layers is called a PIN diode (Fig 20-5) Direct-current bias, applied to one or more PIN diodes, allows RF currents to be effectively channeled without using relays and cables A PIN diode also makes a good RF detector, especially at very high frequencies

an example:

// This returns a collection of author instances var query = from a in ctx.authors select a; // this returns a collection of anonymous type instances var query = from a in ctx.authors join ta in ctx.titleauthors on a.au_id equals ta.au_id join t in ctx.titles on ta.title_id equals t.title_id select new { a.au_id, t.title_id };

"" "\t" "\r" "\n"

Most diodes have an avalanche breakdown voltage that is much higher than the reverse bias ever gets The value of the avalanche voltage depends on how a diode is manufactured Zener diodes are specially made so they exhibit well-defined, constant avalanche voltages

The collection of authors returned by the first query is updatable, and a reference to it can be used outside the function in which it s created The anonymous type is not updatable and cannot be used outside the function in which it s created without using reflection or CastByExample<T> I can see a use for anonymous types in data binding: the good old dropdown list You don t necessarily need to return an anonymous type You can define (by hand) a class that represents the projection of authorid and titleid Or query a view that returns an instance of an object But, in order to do this on a large-scale project, you d need to define a class for each projection in the entire project.

As a database programmer, ask yourself, Can I list every different projection (rowset) that every query in my project returns Very few programmers can answer yes to that question, even though it may be a great tuning aid to be able to enumerate every projection your project returns Therefore, writing a class for every anonymous type is a good idea, but it s a lot of extra work Perhaps there will be a tool that automatically does this in the future If you don t write your own objects for each projection, you re using whole objects That is SELECT * FROM in SQL.

Table 5-1

Suppose a certain Zener diode has an avalanche voltage, also called the Zener voltage, of 50 V If reverse bias is applied to the P-N junction, the diode acts as an open circuit as long as the bias is less than 50 V But if the reverse-bias voltage reaches 50 V even for a brief instant of time the diode conducts This effectively prevents the reverse-bias voltage from exceeding 50 V The current through a Zener diode, as a function of the voltage, is shown in Fig 20-6 The Zener voltage is indicated by the abrupt rise in reverse current as the reverse-bias voltage increases A simple Zener-diode voltage-limiting circuit is shown in Fig 20-7 Note the polarity of the diode: the cathode is connected to the positive pole, and the anode is connected to the negative pole