maintaining state in a web application

... to access rows in a database table. In the following sections, you'll learn how to create an ASP.NET Web application that uses a DataGrid control to access the rows in a database table. ... example, if you're building a Web site that a user can order products from, store their shopping cart in the database. Using a DataGrid Control to Access a Database A DataGrid allows ... class" in the index of the online documentation. Storing Information using the Database If you have a large amount of information to store about a user, store it in the database rather than the...

Ngày tải lên: 24/12/2013, 01:17

... Example 3-5. File: ADOCookbookCS0305.aspx.cs // Namespaces, variables, and constants using System; using System.Threading; using System.Globalization; using System.Data; using System.Data.SqlClient; ... server's settings. The sample code-behind for the Web Forms page contains one event handler and a single method: Form.Load Creates the CultureInformation object based on the user's settings. ... user's culture. [ Team LiB ] [ Team LiB ] Recipe 3.5 Localizing Client-Side Data in a Web Forms Application Problem You need to format dates and currency values according to the culture...

Ngày tải lên: 28/10/2013, 18:15

... “.;c:\jakarta-tomcat\lib\servlet.jar;c:\xalan- ➥ j_2_0_1\bin\xalan.jar;c:\xalan-j_2_0_1\bin\xerces.jar;” ➥ de/tarent/forum/Xalan2Transformer.java -d /classes javac -classpath “.;c:\jakarta-tomcat\lib\servlet.jar;c:\xalan- ➥ j_2_0_1\bin\xalanj1compat.jar;c:\xalan-j_2_0_1\bin\xalan.jar;c:\xalan- ➥ j_2_0_1\bin\xerces.jar;” de/tarent/forum/TransformTag.java ... “.;c:\jakarta-tomcat\lib\servlet.jar;” ➥ de/tarent/forum/OutputChatMessagesTag.java -d /classes javac -classpath “.;c:\jakarta-tomcat\lib\servlet.jar;” ➥ de/tarent/forum/OutputDebugInfoTag.java -d /classes javac -classpath “.;c:\jakarta-tomcat\lib\servlet.jar;” ➥ de/tarent/forum/NoCacheHeaderTag.java ... “.;c:\xalan-j_1_2_2\xalan.jar;c:\xalan- ➥ j_1_2_2\xerces.jar;c:\jakarta-tomcat\lib\servlet.jar;” ➥ de/tarent/forum/Xalan1Transformer.java -d /classes javac -classpath “.;c:\jakarta-tomcat\lib\servlet.jar;c:\xalan- ➥ j_2_0_1\bin\xalan.jar;c:\xalan-j_2_0_1\bin\xerces.jar;” ➥ de/tarent/forum/Xalan2Transformer.java...

Ngày tải lên: 14/12/2013, 22:15

... c:\jakarta-tomcat\classes;c:\jakarta- tomcat\lib\ant.jar;c:\jakarta-tomcat\lib\jaxp.jar;c:\jakarta- ➥ tomcat\lib\servlet.jar;c:\jakarta-tomcat\lib\parser.jar;c:\jakarta-tomcat\lib\we ➥ bserver.jar;c:\jakarta-tomcat\lib\jasper.jar;c:\jakarta- ➥ tomcat\lib\xalanservlet.jar;c:\jakarta-tomcat\lib\xerces.jar;c:\jakarta- ➥ tomcat\lib\xalanj1compat.jar;c:\jakarta-tomcat\lib\aaxalan.jar;c:\jdk1.3\lib\too ➥ ls.jar 2001-05-23 ... c:\jakarta-tomcat\classes;c:\jakarta- tomcat\lib\ant.jar;c:\jakarta-tomcat\lib\jaxp.jar;c:\jakarta- ➥ tomcat\lib\servlet.jar;c:\jakarta-tomcat\lib\parser.jar;c:\jakarta-tomcat\lib\we ➥ bserver.jar;c:\jakarta-tomcat\lib\jasper.jar;c:\jakarta- ➥ tomcat\lib\xalanservlet.jar;c:\jakarta-tomcat\lib\xerces.jar;c:\jakarta- ➥ tomcat\lib\xalanj1compat.jar;c:\jakarta-tomcat\lib\aaxalan.jar;c:\jdk1.3\lib\too ➥ ls.jar 2001-05-23 ... editor. Congratulations! You now have a new Web application installed. As the chess saying goes, “the rest is all a matter of details.”You have what you need: an example of a Java servlet calling a JSP page,...

Ngày tải lên: 14/12/2013, 22:15

... discussed and heralded in particular as a great benefit in connecting legacy applications to modern Web- based applications. Within a Web application, passing even one parameter that contains XML data ... environments. 5.4 XML Data Flows in Web Applications We believe that passing XML data within a Web application will turn out to be as important as passing XML data between systems and applications.The latter ... database management system because handling chat data is an obvious job.We decided against that for several rea- sons. One is that we did not want to assume that all our readers are familiar...

Ngày tải lên: 14/12/2013, 22:15

... of actors, we can hardly have a program intelligent enough to maintain a meaningful user experience. In the bonForum Web application, we also use another mechanism to relate differ- ent Web pages ... Drives the Web Application? In Chapter 8, we will claim that the BonForumEngine servlet is in charge of the Web application after all, it is the communication hub in the Web application. However, viewed ... bonForumXML (a ForestHashtable ) as a string. Now we decided to make it the input XML stream for the Xalan XSLT processor as part of our TransformTag class. Displaying the available chats would mean...

Ngày tải lên: 14/12/2013, 22:15

... Topic ■ Performing thread synchronization ■ Synchronizing the XML database ■ Finding the chat and actor status in Chat ■ Rejoining existing chats ■ Starting a chat ■ Adding a host actor ■ Adding a chat element 08 ... to each JSP-produced page of a bonForum instance. The incoming request parameters are validated and made available to the Web application in whatever scope is appropriate.We will give two examples ... objects as a Web (chat) application n Processes and forwards applet-generated JSP requests n Processes information from all JSPs in the Web application n Initializes the XML data wrapper, a BonForumStore instance n Sets...

Ngày tải lên: 14/12/2013, 22:15

... If the actor was in the chat, always join it with the previous status; otherwise, warn and ask again. 3. If the actor was in the chat, always join as a guest; otherwise, warn and ask again. 08 ... database (now a ForestHashtable ) n Initializes the XML database for use as a chat Web app n Loads XML files into a database using its methods n Dumps the content of the database as XML in a ... classes, one for Xalan-Java 1 and one for Xalan- Java 2. Simplifying greatly, here are the statements called by the TransformTag class to get its XML database in a string: private static BonForumStore...

Ngày tải lên: 14/12/2013, 22:15

... about vari- ables that are used in the Web application. It will assume as it translates the tag that these variables are available as page attributes. Later, when we look at the translated Java ... time about tags and the variables they use.These classes are TagAttributeInfo , TagData , TagExtraInfo , TagInfo , TagLibraryInfo , and VariableInfo . The doStartTag( ) Method Implementing the ... de.tarent.forum; import javax.servlet.jsp.tagext.*; public class BonForumTagExtraInfo extends TagExtraInfo { public VariableInfo[] getVariableInfo(TagData data) { return new VariableInfo[] { new VariableInfo(“output”, “String”, true, 10...

Ngày tải lên: 14/12/2013, 22:15

... without using any tabs or spaces! Thankfully, that bug seems to be gone now—at least, while using the Xalan- Java 1 compatibility JAR or the Xalan-Java 2 JAR. 10.8 Displaying the Available bonForums We ... system_executes_command.jsp. Note that if you have Xalan-Java-2 , you can also set xalanVersion to Xalan Java 1 , as long as the compatibility JAR file is accessible, for example, as TOMCAT_HOME\lib\xalanj1compat.jar. Let’s ... two classes to encapsulate the steps required for either Xalan-Java 1 or Xalan-Java 2 .The classes are called Xalan1Transformer and Xalan2Transformer . Each has one method called transform , which...

Ngày tải lên: 14/12/2013, 22:15

... the pathNameHashtable (as an element this time) with a key that is a string containing the pathName that was just given as an example. Mapping User Choices to PathName Keys We can now display ... this watermark. 416 Chapter 11 XML Data Storage Class: ForestHashtable attribute to a chat element.We will also try using it to allow a chat host to change the rating of a guest in a chat. Warning The ... created by the following statement from the file ForestHashtable.java: public NodeNameHashtable nodeNameHashtable = new NodeNameHashtable(); Notice that a class called NodeNameHashtable has...

Ngày tải lên: 14/12/2013, 22:15

... “.;c:\jakarta-tomcat\lib\servlet.jar;c:\xalan- j_2_0_1\bin\xalan.jar;c:\xalan-j_2_0_1\bin\xerces.jar;” de/tarent/forum/Xalan2Transformer.java -d /classes javac -classpath “.;c:\jakarta-tomcat\lib\servlet.jar;c:\xalan- j_2_0_1\bin\xalanj1compat.jar;c:\xalan-j_2_0_1\bin\xalan.jar;c:\xalan- j_2_0_1\bin\xerces.jar;” ... -XSL bonChatGuests.xsl -OUT bonChatGuestsTEST.html java -classpath “c:\jakarta-tomcat\lib\xalanj1compat.jar;c:\jakarta- tomcat\lib\xerces.jar;c:\jakarta-tomcat\lib\xalan.jar” org.apache.xalan.xslt.Process ... “.;c:\jakarta-tomcat\lib\servlet.jar;” de/tarent/forum/BonForumTagExtraInfo.java -d /classes javac -classpath “.;c:\jakarta-tomcat\lib\servlet.jar;” de/tarent/forum/OutputPathNamesTag.java -d /classes javac -classpath “.;c:\jakarta-tomcat\lib\servlet.jar;” de/tarent/forum/OutputChatMessagesTag.java...

Ngày tải lên: 24/12/2013, 07:17

... previous status, else warn and ask again // 3. if actor was in it, always join as guest, else warn and ask again // All these choices can be modified re actorRestartingCurrentChat value // For now, we implement ... { if(haveChatItem) { boolean actorIsHostInChat = false; boolean actorIsGuestInChat = false; boolean actorWillRejoinChat = false; // See if chatItem (i.e., subject+topic) exists already as a chat: chatNodeKeyKey ... behavior of “visitor starts chat” when chat exists // 1. always warn user and ask again for new subject and/or new topic // 2 if actor was in it, always join with previous status, else warn and...

Ngày tải lên: 24/12/2013, 07:17

... * @param parentNodeKeyKey String * @param nameAndAttributes String * @param content String * @param forestHashtableName String * @param nodeKeyHashtableName String * @param sessionId String * ... = (String)session.getAttribute(“chatMessagesNavigator”); if(!navigation.equals(“same”) && !navigation.equals(“first”) && !navigation.equals(“previous”) && !navigation.equals(“next”) && !navigation.equals(“last”)) ... ForestHashtable member. * * * @param pathToSubTreeRootNode String * @param parentNodeInDestination String * @param node Node * @param nodeKeyHashtableName String * @param sessionId String */ protected...

Ngày tải lên: 24/12/2013, 07:17

Ngày tải lên: 24/12/2013, 07:17

Ngày tải lên: 24/12/2013, 07:17

Ngày tải lên: 24/12/2013, 07:17

Ngày tải lên: 24/12/2013, 07:17

Ngày tải lên: 05/03/2014, 23:20

... display an image from a database column in an ASP.NET control. Solution Fill an ASP.NET Image control from a database field by pointing the ImageUrl property of an Image control to a web page ... statement to retrieve the required image from the database and retrieve the image using a DataReader. A DataTable or DataSet filled using a DataAdapter can also be used. 3. Set the ContentType property ... following steps outline the required tasks: 1. Create a web page that outputs a binary stream containing the image from the database. 2. Create a SQL statement to retrieve the required image...

Ngày tải lên: 28/10/2013, 18:15