KR100429558B1 - ADE data set component of client computer for transmitting/receiving of data between web servers - Google Patents

Abstract

The present invention provides a new client data model that guarantees maximum performance and ease of use in using an ActiveAx controller as a user interface component in a web environment, and aids of client computers to send and receive data to and from a web server through standard HTTP. The present invention relates to a component, wherein the present invention generates a data object model from a data store storing data on a server and data output from the data store, and constructs a data object model when constructing HTML requested from a client computer through HTTP. A client computer having a data model application method in an existing web-based environment using data, wherein the HTTP (Hyper Text Transfer Protocol) is transmitted to a web server through a web browser used according to a client's request input to the client computer. ) And Oh Going from the Web server, the HTTP response - Aid to transfer the results being sent to run the program as a result of the service data storage: made up (ADE Active Data Expression) dataset component (Component).

Description

ADE data set component of client computer for transmitting / receiving of data between web servers}

The present invention provides a web server through a new client data model and standard Hyper Text Transfer Protocol (HTTP) that guarantee maximum performance and ease of use in using ActiveX control as a user interface component in a web environment. Server (Aid) Active Data Expression (ADE) dataset component of the client computer for sending and receiving data.

In general, ActiveAx Control can be written in any programming language that supports Microsoft's COM. Active AX Control is a component or standalone program that can be created and reused by many applications on a single computer or distributed network. Support for distributed environments in COM is specifically called the Distributed Component Object Model (DCOM). In terms of the actual implementation of ActiveX controls, it's a type of DLL module that runs inside an application with a COM program interface called a "container." Approaches that use reusable components contribute to shortening the development time of the application and improving the program's functionality and quality. Application development tools for Windows 95 / N, such as PowerBuilder and Microsoft Access, take advantage of this Active Ax control. Visual Basic and C ++ are also widely used to create OCX and Active Ax controls.

ActiveAx is the name Microsoft has given to its strategic object-oriented programming technologies and toolbars. Its main technology is COM. COM used in the network with directories and other additional support becomes DCOM. The important thing to create when developing a program that runs in an Active AX environment is a component, which can be under one program that is sufficient for itself to run anywhere in the Active AX network. This component is called the active ax control. In addition, ActiveAx is Microsoft's technology to counter Sun Microsystems' Java technology. Thus, ActiveX control is usually on par with a Java applet. Here, many files with "OCX" in the file extension are found on PCs with the Windows operating system. OCX stands for "Object Linking and Embedding control." Object Linking and Embedding (OLE) was Microsoft's programming technology for supporting compound documents such as the Windows desktop, but now Microsoft uses the term "ActiveX control" instead of OCX for component objects. .

In particular, one of the main advantages of components is that they can be reused in many applications. ActiveAx Control can be created using a variety of languages or development tools, including scripting tools such as C ++, Visual Basic, PowerBuilder or VBScript.

ActiveAx Control currently works only on Windows 95, NT and Macintosh, but Microsoft plans to support ActiveAx Control on Unix.

Meanwhile, the COM is a sub-infrastructure for developing and supporting component objects of a program, and aims to provide a level of function defined in a common object request broker architecture (CORBA). And while Microsoft's OLE provides services for compound documents that users can view on the screen, COM provides interface negotiation, lifecycle management (determining when objects can be removed from the system), licensing, and event services ( Provide an underlying service, such as assigning an object to a service as a result of an event occurring in another object.

1 is a block diagram showing the interworking between a web server and a legacy system in a general Internet environment.

As shown in FIG. 1, a client computer 10 requesting a service through all kinds of web browsers used according to a client's request, and HTML generated according to a request signal output from the client computer 10 ( Legacy which provides a web server 20 which transmits a hypertext markup language to the client computer 10 and middleware information (Tuxedo, Entera, etc.) implemented by the web server 20. It consists of a system (Legacy system) (30).

The HTML is a markup symbol or set of code embedded in a file for displaying information on a web browser. Markups tell web browsers how to render text or images within a web page. The HTML is an open format based on SGML, and can be written or edited in a variety of ways, from simple plain text editors to WYSIWYG authoring tools. Structure it.

The tag starts with a "<" mark and ends with a ">" mark. There are several examples below.

Hyperlink: <A HREF="http://www.terms.co.kr/memory.htm">

Adjust font size: <h1> Terms korea </ h1>

Insert image: <img src = "related.gif" width = "235" height = "14">

In addition, HTML was formally defined by the W3C, but both companies, such as Netscape and Microsoft, which develop web browsers, continue to incorporate changes in their browsers.

Meanwhile, the web server 20 may include a data store 20-1 storing data and a data object model generator 20-3 generating a data object model from data output from the data store 20-1. ), And a data object model output from the data object model generation unit 20-3 and a program such as tuxedo or entera built in the legacy system 30 to generate HTML according to the language of the web server 20. HTML generation unit 20-5.

The tuxedo of the middleware information built in the legacy system 30 is a Tipi-monitor product supplied by BEA Systems in California, USA, which is a program that runs on various kinds of UNIX-based computers, and is supplied by Borland, Inc. It is a tip-monitor product that functions like a tuxedo.

In addition, the middleware refers to a program that acts as a mediator or associates between two separate programs in the computer field, such as "glue".

In particular, the typical function of the middleware is a program written to access a specific data store.

Referring to the configuration diagram showing the interworking between the web server and the existing legacy system in the general Internet environment configured as described above will be described as follows.

First, the client computer 10 requests a service to all kinds of web servers 20 used according to a client's request.

Here, the web server 20 is a middleware that is a middle layer providing a management function for a user program, and provides a platform for an application having a management function for a user application, and defines a middleware product for an application in a web environment. Can be.

In addition, the web server 20 mainly functions as a development tool that supports application development in a system backend more quickly and easily, system security and stability, and supports a faster speed function of the web.

Meanwhile, the HTML generation unit 20-5 of the web server 20 individually codes and processes middleware information (tuxedo, entera, etc.) that are built in the legacy system 30 in accordance with the web server 20. One HTML is sent to the client computer 10.

The operation of the web server will be described in more detail as follows.

The object model generator 20-3 of the web server 20 generates an object model from data transmitted from the data storage 20-1, and then converts the generated object model into an HTML generator 20-5. To send.

The HTML generator 20-5 processes the object model received from the data object model generator 20-3 and transmits the processed HTML to the client computer 10.

Accordingly, the representation of data in the web HTML page configured as described above is generally performed through an HTML page dynamically generated by querying data at the web server side. As an alternative, there is a technology that dynamically controls static HTML pages at the client end with dynamic HTML function provided by a web browser.

Based on the dynamic HTML technology, a method of accessing a client-side data model to search for data, inputting / modifying / deleting data is a mainstream method of data representation in a web HTML page.

However, if there is a problem with the existing client data model, the client end directly accesses the data source (data store) on the server to collect data and provide the object model to the client, or the object model generated at the server end is used to establish a data communication interval. The transfer is made to the client side.

In particular, the two-tier approach between the client and the data source makes it impossible to see the effects provided by the three-tier model and results in significant performance degradation in terms of transmission speed.

Accordingly, the present invention has been proposed to solve the above-mentioned problems according to the prior art, and an object of the present invention is to ensure maximum performance and ease of use in using an active ax controller as a user interface component in a web environment. New client data model and Aid dataset component of client computer for sending / receiving data to web server through standard HTTP.

A feature of the Aid dataset component of a client computer for transmitting / receiving data between web servers according to the present invention for achieving the above object is

Existing web-based method that generates data object model from data store storing data on server and data output from data store and uses data through data object model when constructing HTML requested from client computer through HTTP. A client computer having a data model application method in an environment,

Requests HTTP (Hyper Text Transfer Protocol) to a web server through a web browser used according to a client's request input to the client computer, receives an HTTP response-service program execution result from the web server, and receives the data. It consists of an ADE (Active Data Expression) dataset component that is sent to the storage.

1 is a block diagram showing the interworking between a web server and a legacy system in a general Internet environment,

2 is a block diagram showing an aid dataset component and its surroundings of a client computer according to the present invention;

3 is a flowchart illustrating the operation of an aid dataset component of a client computer for transmitting / receiving data between web servers according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: client computer

130: DHTML part

140: Aid dataset component

200: web server

300: Legacy System

Hereinafter, a preferred embodiment of an aid dataset component for transmitting / receiving data between web servers according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram illustrating an aid dataset component and its surroundings of a client computer according to the present invention.

As shown in FIG. 2, the client computer 100 requesting a service through all kinds of web browsers used according to the client's request, and the HTML generated according to the request signal output from the client computer 100 ( A web server 200 that transmits a hypertext markup language to the client computer 100 and a middleware information (Tuxedo, Entera, etc.) implemented by driving the web server 200. Constructed legacy system (Legacy system) (300).

Here, the client computer 100 is a D (Dynamic) HTML unit 130 for performing new HTML tags, options, style sheets and programming according to the client's request input to the client computer 100, and the DHTML unit Requests HTTP (Hyper Text Transfer Protocol) to a web server through a web browser used according to a client's request sent from the 130, receives an HTTP response-service program execution result from the web server, and receives the data. It consists of an ADE (Active Data Expression) dataset component (140) to transmit to the storage.

Here, HTTP is an application protocol related to TCP / IP as a protocol required for transmitting and receiving files (text, graphic images, sound, video, and other multimedia files) on the web. And, the important concepts that make up a part of HTTP are that, as the name implies, every file can have a reference link to other files, and when that link is selected, another content is passed. It is an idea. In other words, all web servers have HTTP daemons, which are designed to wait for HTTP requests and process them as they come. On the other hand, a web browser from the standpoint of HTTP is a client that sends a request to a server. When a user requests a file by entering a URL or clicking a hypertext link, the browser forwards it to the IP address specified in the HTTP request. The HTTP daemon on the specified server receives the request, processes the job if necessary, and finds and sends the requested file.

Looking at the configuration of the Aid dataset component in detail as follows.

The aid dataset component 140 generates a data object model from data storage 140-9 storing data and data output from the data storage 140-9 and requests a screen of the client computer 100. A data object model generation unit 140-11 for transmitting the HTTP (Hyper Text Transfer Protocol) and a URL (Uniform Resource Locator) for analyzing the address of the resource transmitted from the DHTML unit 130 of the client computer 100; A domain name for identifying a specific computer on the Internet, and a path name hierarchically indicating a location of a computer file. The web server receives data transmitted from the URL analyzer 140-1 and the URL analyzer 140-1. HTTP request unit 140-3 for requesting HTTP to 200, a data receiver 140-5 for receiving an HTTP response-service program execution result from the web server 200, and the data receiver 140-. 5) receive from After analyzing the information, and converts the analyzed information into a memory structure of the dataset (Dataset) form of the data set conversion unit 140-7 for transmitting to the data storage (140-9).

In particular, the URL refers to a format that can consistently represent the address of the resource accessible from the Internet. The type of resource described herein may vary depending on the Internet application protocol. In other words, when using HTTP, the protocol of the World Wide Web, resources can be HTML pages, image files, programs such as CGI or Java applets, and other files supported by HTTP.

In addition, the URL includes a name of a protocol required to access a resource, a domain name for identifying a specific computer on the Internet, and a path name hierarchically indicating the location of a computer file.

On the other hand, if you take an example of a URL on the web,

http://www.metro.seoul.kr/kor

It represents a web page that can read a computer named www.metro.seoul.kr with an HTTP application, a web browser. Here / kor refers to a directory on the computer. If you don't specify a file name underneath it, it will display the directory's default page (usually index.html). And an HTTP URL can refer to any web page, not just a home page, and even a single file. For example, the following URL will show the user an image of the term operator.

http://www.terms.co.kr/dgkim.gif

The URL of a program such as bulletin board CGI has the following form.

http://www.terms.co.kr/bbs/bbs.cgi?db=bbs

Meanwhile, the URL for downloading a file using the ftp protocol is expressed as follows.

ftp://www.somecompany.com/whitepapers/widgets.ps

URL is a kind of Uniform Resource Identifier (URI).

The operation of the aid dataset component of the client computer for transmitting / receiving data between web servers according to the present invention configured as described above will be described with reference to FIG.

First, the URL analysis unit 140-1 of the client computer 100 specifies an URL for a service object from the information transmitted from the DHTML unit 130 of the client computer 100 to designate an HTTP request unit 140-3. Send information to In addition, the HTTP request unit 140-3 uses the properties and methods of the dataset component in the client HTML page to display the Common Gateway Interface (CGI) or Java Server Page (JSP) / ASP (Active Server Page) on the web server 200. Alternatively, the legacy system 300 is called using the HTTP protocol for a service object that queries data from a data source through a servlet (S101) (S103).

At this time, the name of the service object and a list of data sets to be returned by the service object are specified together. Here, the dataset component refers to a component that stores / manages data in a client fish.

The CGI is a standard method for delivering a user's request to an application in a web server and returning the result to the user. When a user requests a web page by clicking a hyperlink or entering a web site address, the server sends the requested page. However, when a user fills out a form on a web page and sends it, it usually needs to be processed by the application. The web server usually passes the form information to a small application, which processes the data and sends confirmation messages as needed. These methods and conventions for exchanging data between a server and an application program are called CGIs. This is part of the web's HTTP protocol. If you want to use a CGI program for some control when creating your website, you can specify the program's name in the URL in the HTML file. If you are trying to create a form, this URL can be described as part of the FORMS tag, for example:

<FORM METHOD = POST ACTION = http: //www.mybiz.com/cgi-local/formprog.pl>

As a result of this tag, the server at mybiz.com transfers control to the CGI program called "formprog.pl" and returns a confirmation message to store the data entered (where .pl is a program written in perl). Key, but CGI can also be written in other languages). The CGI also provides a consistent way for the data to be passed from the user to the application and back to the user. This means that from the point of view of the person writing the application, no matter what operating system the server uses, you can be confident that the program will run. And, CGI is a simple and basic way for information from a user's request to be sent from a web server to an application program and back. Because the interface is consistent, programmers can write CGI applications in many different languages. The most commonly used languages for writing CGI programs include C, C ++, Java, and Perl. An alternative to the CGI program, on the other hand, is Microsoft's ASP, which is a script embedded within a web page that is executed on the server before the page is sent.

In addition, the JSP is a technology for controlling the content or appearance of the web page through the use of servlets. Sun's developer Sun Microsystems says JSP technology is a servlet API. JSP is comparable to Microsoft's ASP technology. Whereas JSP calls a Java program to be executed by a web server, ASP contains a script that will be interpreted by a script interpreter (such as VBScript or JScript) before the page is sent to the user. In particular, HTML pages that contain links to Java servlets have a .JSP extension in the filename extension.

The ASP, on the other hand, is processed on a Microsoft web server before being sent to the user as an HTML page containing one or more scripts (small embedded programs). Also, ASP is quite similar to SSI or CGI applications where all of the related programs are executed on the server to create and present a web page to the user. Usually, the web page script on the server accesses the datastore according to the user's request, and then based on the result, instantaneously creates or specializes the web page before sending it to the requester. In addition, the ASP is a feature of Microsoft Internet Information Server (IIS), but since the server-side script generates a plain HTML page, it can be used in almost any browser. You can create an ASP file so that it contains VBScript or JScript in the HTML file, and then rename the file extension ".asp". At Microsoft-if you have a choice-you are pushing to use server-side ASPs rather than client-side scripts. Because server-side scripts make HTML pages easier to see, client-side scripts (such as JavaScript) may not work as intended for older browsers.

In particular, the servlet is a small program that runs on the server. The term is coined in the context of Java applets, small programs that are sent as separate files with a web page. Java applets are usually designed to run on the client for services such as performing simple computational tasks for the user or locating images based on the user's response. However, according to user input, programs associated with the datastore need to be executed on the server. Usually these are implemented using the Common Gateway Interface (CGI). However, using a Java virtual machine running on the server, such programs can be implemented in the Java language. The advantage of Java servlets on the server is that they can run faster than CGI applications. Instead of creating a separate process for each user's request, the servlet is invoked as a thread within a single daemon process, which means less system overhead for each request. Instead of a URL that specifies the name of a CGI application, the request in the web page that is the result of the Java servlet being called will call the URL.

http://www.terms.co.kr:8080/servlet/gotoUrl?http://www.someplace.co.kr

The port number "8080" in the URL means that this request goes directly to the web server itself. Some additional modules allow Java servlets to run on Netscape Enterprise or Microsoft's IIS and Apache servers.

On the other hand, after performing step S103, the legacy system 300 parses the HTTP request of the data set, loads and executes the service object module on the server, and then processes the result data into a format for transmission (DataBuffer). In step S105 and S107, data is transmitted to the data receiver 140-5 through the HTTP response service.

The format of the data buffer structure is shown in Table 1 below.

OxFF Full Size (10) OxFF 'E' Error Size (10) OxFF ErrorCode (10) ErrorMsg (variable) OxFF Datatable Count (10) OxFF Type (1) Size (10) OxFF Datatable OxFF Type (1) Size (10) OxFF Datatable

Where the total size is the size of all data after OxFF after the full size,

'E': Error info area starts, size is 1,

Error Size: Error Code + Error Message Data Size

Datatable Count: Number of datatables included in this data buffer.

Type: Processing method of the data table (G = AIIRow, B = BLOB, S, F, X = FirstRow)

Size: The size of the data table.

The data receiver 140-5 parses the received information, analyzes whether the data is valid data, extracts the actual data, and transmits the extracted actual data to the data set converter 140-7 (S109). ).

The data set conversion unit 140-7 generates a record set object in the data set component in the form of the data returned by the service object module on the server, and generates the generated record set object. To the data storage 140-9 (S111).

As described above, the present invention has an effect of transmitting data through a standard HTTP and a new client data model that guarantees maximum performance and ease of use in using an AX controller as a user interface component in a web environment. .

In addition, the data object model is created on the client side to compensate for the shortcomings of the existing client data model, but the performance is improved by delivering only the pure data generated through the server side service through the transmission section.

Claims (2)

Existing web-based method that generates data object model from data store storing data on server and data output from data store and uses data through data object model when constructing HTML requested from client computer through HTTP. A client computer having a data model application method in an environment, Requests HTTP (Hyper Text Transfer Protocol) to a web server through a web browser used according to a client's request input to the client computer, receives an HTTP response-service program execution result from the web server, and receives the data. An ADE component of a client computer for transmitting / receiving data between web servers, comprising an ADE (Active Data Expression) data set component that is transmitted to a storage. The method of claim 1, The aid dataset component, A data store for storing data; A data object model generation unit generating a data object model from data output from the data store and transmitting a requested Hyper Text Transfer Protocol (HTTP) to a screen of a client computer; A Uniform Resource Locator (URL) analyzer for analyzing an address of a resource transmitted from the DHTML unit of the client computer; An HTTP request unit which receives data transmitted from the URL analyzer and requests HTTP from a web server; A data receiving unit for receiving an HTTP response-service program execution result from the web server; After analyzing the information received from the data receiving unit, and converts the analyzed information into a dataset (Dataset) type of memory structure and a dataset conversion unit for transmitting the data to the data storage, characterized in that the transmission / Aid component of the client computer for receiving.