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The ClassforName() call causes the JDBC driver class to be loaded According to the JDBC specification, drivers should include a static initialization section that causes an instance to be created and registered with the driver manager Some older drivers fail to do this and, in that case, invoking the newInstance() method on the driver class is necessary The DriverManager class provides the actual connection in response to the call to its static getConnection() method Note, the con variable that holds a reference to the connection is declared and assigned a null value Then the rest of the page is enclosed in a try {} block followed by

finally { if (con != null) { conclose(); } }

The reason for this is, once opened, the connection needs to be closed, regardless of whether any errors occur or exceptions are thrown This can be guaranteed by the finally { } block Including a catch block is unnecessary; in our case, the default exception handler is good enough Once the connection is established, the SQL query can be run For this, we call the Connection object s createStatement() method to obtain a Statement object, on which we can invoke the executeQuery() method

String + " + " + " + " + " ; sql = "" SELECT Ddeptname, Efname, Elname," Etitle, Eemail, Ephone" FROM departments D, employees E" WHERE Ddeptmgr = Eempno" ORDER BY Ddeptname"

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Being patient and observing how the different trendlines shift like this will give you con dence and help you understand how price action works Knowing the various trends at work in the market also helps a trader coordinate lower time frame charts If the short-term and intermediate-term trends are higher on the 240-minute chart, we don t have to look to know that it is very likely that the primary trend on the 60minute chart also will be higher If the intermediate-term trend is higher on the 240-minute chart, most likely the short-term trend on the daily chart will be higher The implications of this are very important for traders on both the lower and higher time frames Knowing when the trends started and in which direction they are pointed is also a simple way to determine whether the market we are analyzing is in a trending or countertrending mode If the majority of trends, particularly the long-term trends, are pointing in the same direction, we are in a trending market If the trends are in ux, we are very likely in a countertrend market It is also important to understand that once a short-term trendline is violated, it is likely that the market will migrate to the intermediate-term trendline, and once the intermediateterm trend is violated, it becomes more likely that the market will try to test the long-term trendline It is often at this point, after a closing penetration of the intermediate-term trend, that a market will show us whether it has real underlying strength or this is just another secondary move Note in Figure 9-11 how powerful the stochastic buy signal marked by the gray vertical line on November 24 turned out to be This was the case because we already had an intermediate-term trend shift in place This short-term stochastic signal was the equivalent of.

Statement stmt = concreateStatement(); ResultSet rs = stmtexecuteQuery(sql);

13:

executeQuery() returns a ResultSet Our listing simply reads each row of this set by invoking its next() method in a loop:

while (rsnext()) { String dept = String fname = String lname = String title = String email = String phone =

rsgetString(1); rsgetString(2); rsgetString(3); rsgetString(4); rsgetString(5); rsgetString(6);

%> <DT><B><%= dept %></B></DT> <DD> <%= fname %> <%= lname %>, <%= title %><BR> (919) 555-0822 x<%= phone %>, <%= email %> </DD> <% } JSP IN ACTION

Inside the loop, we extract each column value with the ResultSetgetString (columnNumber) method, and then format and print the department name, manager name, title, telephone number, and e-mail lines Finally, we close all the JDBC objects we created and set their references to null, so they can be garbage collected

rsclose(); rs = null; stmtclose(); stmt = null;

The Connection object is closed in the finally { } block previously discussed The finished product is shown in Figure 13-3

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