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But what you ll often want to do is coerce a month constant to an integer so that you can see what you re working with For example, the following statement returns 6, the integer value for June:

of a PNP transistor At B, the schematic symbol Electrodes are E = emitter, B = base, and C = collector

Summary

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{ Console.WriteLine("Customer: Id={0}, Name={1}", rs["cust_id"], rs["cust_name"]); } } }

Imagine a bipolar transistor as consisting of two diodes in reverse series You can t normally connect two diodes this way and get a working transistor, but the analogy is good for modeling the behavior of bipolar transistors A dual-diode NPN transistor model is shown in Fig 22-3A The base is formed by the connection of the two anodes The emitter is one of the cathodes, and the collector is the other cathode Figure 22-3B shows the equivalent real-world NPN transistor circuit

The code sample starts off by creating a SqlCeCommand instance B This uses a previously established (and opened) database connection called cnn The command string is the name of the Customers table This is further reinforced by setting the CommandType property C to TableDirect TableDirect mode allows you to access all rows within the specified table, and in effect behaves similar to a traditional database cursor When using TableDirect mode, you can also optionally provide an index range to filter the rows that will be returned In this example, we restrict the result set D to only include rows where the IDX_CustName index has a value beginning with the letter F Once we ve specified which rows from the table we want to access, we re ready to send the command to the database engine via a call to the ExecuteResultSet method E.

Just as the month property of the date object returns a month constant, so the weekday property of the date object returns a weekday constant containing the name of the day of the week Saturday, Sunday, or one of the five less friendly days You can use the weekday constants to perform calculations if you want For example, (Saturday) (Wednesday) returns 3, the number you get if you subtract 4 (Wednesday s integer value) from 7 (Saturday s integer value) You can also coerce the weekday constants to their corresponding integers For example, Sunday as integer returns 1, Monday as integer returns 2, and Tuesday as integer returns 3

Because we ve explicitly provided the database engine with the required table and index names, the database engine will have a lot less difficulty processing this query than if we passed it an opaque string containing T-SQL The call to ExecuteResultSet will return quickly, as it has in effect opened the equivalent of a database cursor It s only when we start stepping over each row with successive calls to the Read method that data is fetched While processing each row, you can access the columns within the result set by using the indexer operator F Because the result set was created with the ResultSetOptionsSensitive flag, it s even possible to assign columns new values, and these changes will make their way back to the database engine Although ADO.

The NPN Case The normal method of biasing an NPN transistor is to have the collector voltage positive with respect to the emitter This is shown by the connection of the battery in Figs 22-3A and 22-3B Typical dc voltages for a transistor power supply range between 3 V and about 50 V A typical voltage is 12 V In the model and also in the real-world transistor circuit, the base is labeled control, because the flow of current through the transistor depends critically on what happens at this electrode Zero Bias for NPN Suppose the base of a transistor is at the same voltage as the emitter This is known as zero bias When the forward bias is zero, the emitter-base current, often called simply base current and de-

If you need the full date and time, you can coerce a date object to a string For example, the following statement displays a dialog box showing the full current date and time, as shown in Figure 5-2: