c# .net core barcode generator

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Musical Instruments - Items <%= rsgetRow() + 1 %> through <%= nRows %> </H3> <TABLE BORDER=1 CELLPADDING=3 CELLSPACING=0> <TR><TH>Item</TH><TH>Price</TH><TH>Description</TH></TR> <% while (rsnext()) { String itemcode = rsgetString(1); double price = rsgetLong(2) / 1000; String description = rsgetString(3); %> <TR> <TD><%= itemcode %></TD> <TD ALIGN="RIGHT"><%= PRICE_FMTformat(price) %></TD> <TD><%= description %></TD> </TR> <% } } finally { if (rs != null) { rsclose(); rs = null; } if (stmt != null) { stmtclose(); stmt = null; } if (con != null) { conclose(); con = null; } } %> </TABLE> </BODY> </HTML>

The Statement object is opened so the result sets it creates are scrollable, but not updatable Having these properties, the ResultSet can be asked how many rows it contains, which wasn t possible in JDBC 10 By positioning the cursor at the last row and issuing a relative(-10) method call, the last ten rows in the result set can be isolated and printed Figure 13-12 shows the results

With JDBC 20, updating columns in a result set is possible, both to add new rows and to delete existing rows In each of these cases, the corresponding rows in the underlying table are then also updated

13:

The code uses the new role s identifier to retrieve the new row added to the database:

Figure 13-12

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For a result set to be updated, it must have been produced by a Statement object created with a concurrency type of ResultSetCONCUR_UPDATABLE JDBC 20 provides updateXXX() methods, where XXX is the JDBC data type, similar to the existing getXXX() methods These methods take a column number or column name parameter, and a value parameter, as illustrated in the following example:

double mySalary = rsgetDouble( SALARY ); mySalary *= 20; rsupdateDouble( SALARY , mySalary); rsupdateString( HOME_PHONE , unlisted); rsupdateRow();

.

The updated values aren t automatically replicated in the underlying table until updateRow() is called The updates can be canceled explicitly with ResultSet cancelRowUpdates() if updateRow() hasn t yet been called or implicitly if a cursor movement method is called before updateRow()

The results for this servlet can be seen in Figure 4-1

4:

Figure 4-1

This section outlines several important classes from the javaxservlet and javaxservlethttp packages Full details of the servlet API can be found in Appendix A

The basic servlet abstraction is the javaxservletServlet interface, shown in Table 4-1 It prescribes the set of methods that must be implemented by a servlet class for it to be recognized and managed by a servlet engine Its primary purpose is to supply the lifecycle methods init(), service(), and destroy() The servlet API provides a concrete implementation of the Servlet interface named GenericServlet, described in Table 4-2 This class supplies default implementations of all the interface methods except service() This means you can write a basic servlet simply by extending GenericServlet and writing a custom service() method

Called once by the servlet engine after a servlet is loaded, just before it s placed into service If init() throws an UnavailableException, the servlet is then taken out of service A servlet should provide some way to store the config object to implement the getServletConfig() method (see GenericServlet) Returns the ServletConfig object passed to the servlet s init() method Handles the request described in the request object, using the response object to return its results to the requester

ServletConfig getServletConfig() void service( ServletRequest request, ServletResponse response) throws ServletException, IOException String getServletInfo()

Returns a string that can describe the servlet Intended for use by administrative tools that need to provide a human-readable description Called by the servlet engine when the servlet is about to be unloaded

void destroy()

Table 4-1

4:

void destroy() String getInitParameter (String name)

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