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The JSP page uses a hidden field named state to keep track of what s happening in the game Based on the state, it displays the appropriate form: I State 0 The initial form explains the game and sets up the variables to be used These include the state, the number of guesses, the highest value known to be too low, and the lowest value known to be too high The variables are all stored as hidden fields in the form I State 1 After the user clicks the OK button, the program retrieves the too-low and too-high parameters and uses the average of the two as its next guess The form presents the user with three radio buttons to indicate whether the guess is too low, too high, or exactly right The low and high values, the user result selection, and the incremented number of guesses are stored again as hidden fields I State 2 Based on what the user specified in the radio buttons, the program updates either the too-low or the too-high value with the new upper or lower bound If the guess was exactly right, the program congratulates itself and prompts for whether to play again Otherwise, it displays the known upper and lower bounds and its next guess, as shown in Figure 14-1 The problem with hidden fields is they can only be used in HTML forms If the user clicks a hyperlink and leaves the page, the hidden fields are lost, unless the technique described in the next section URL rewriting is also employed

unsustainable We will cover price channels in 6 in the section on price formations, but we can see now how it s actually support and resistance levels and the trendlines drawn from them that are the basis for chart formation Figure 5-12 shows a commonly seen situation More often than not a trading range proves to be a price pause before resumption in the same direction in which the market was moving before entering the range This occurs because markets tend to trend more than they reverse Trendlines can be horizontal or angular and connect to at least two price points, with the third point adding validity This is a

Figure 14-1

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A URL can have parameters appended to it that are sent along with the request to the Web server These parameters are name/value pairs having the following syntax: http://server/MyPagejsp name1=value1&name2=value2& When the JSP page receives the request, it can read the values with

String value1 = requestgetParameter("name1"); String value2 = requestgetParameter("name2");

Dynamically generated Web pages can take advantage of this facility to store session data in URLs that are written to the page as hyperlinks This allows the client to remind the server of all values necessary to put the server application into the required state A simple example would be a counter that indicates the number of times a user has accessed a page during the current session, as shown in the following listing:

14:

The method will be decorated with the StoredProcedure attribute where the stored procedure name will be specified. The method name will be similar or equal to the stored procedure name. SQLMetal will infer the method return type by analyzing the SQL statement that the stored procedure uses. For this reason there are some situations the SQLMetal tool can t handle. If the stored procedure uses temporary tables or dynamic SQL (by calling the sp_executesql system-stored procedure), the tool will not be able to infer the result s type. Therefore, it will not able to define a related method with a valid return type. These kinds of stored procedures cannot be used with LINQ to SQL. Finally, the body of the generated method contains a call to the ExecuteStoredProcedure method provided by the DataContext class. This method has two parameters indicating the MethodInfo object for the current method (useful for discovering the stored procedure name by reflection) and a collection of parameters that have to be passed to the stored procedure. Listing 2-20 uses this method to call the related stored procedure.

<TITLE>Page Counter Using URL Rewriting</TITLE> </HEAD> <BODY> <H3>Page Counter Using URL Rewriting</H3> <% int count = 0; String parm = requestgetParameter("count"); if (parm != null) count = IntegerparseInt(parm); if (count == 0) { %> This is the first time you have accessed this page <% } else if (count == 1) { %> You have accessed the page once before<% } else { %> You have accessed the page <%= count %> times before<% } %> <P> Click <A HREF="Counterjsp count=<%=count + 1 %>" >here</A> to visit the page again </BODY> </HTML>

When the user requests the page for the first time using nothing but the basic URL, no count parameter exists and, therefore, the integer count variable is set to zero:

At the bottom of the page is a hyperlink that invokes the same counterjsp page again but, this time, with a count parameter with a value one greater than the current count:

Each time the page is reinvoked, the counter is updated and the message changes:

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