c# barcode reader library WEB ACCESS TO METADATA, PART 2 in Font

Drawing PDF417 in Font WEB ACCESS TO METADATA, PART 2

CHAPTER 9 WEB ACCESS TO METADATA, PART 2
Painting PDF417 In None
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MySQL Database Setup
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mysql> use octopus; Database changed mysql> create table emps( -> id varchar(10), -> name varchar(20), -> resume TEXT, -> photo BLOB, -> primary key(id) -> ); Query OK, 0 rows affected (0.05 sec) mysql> desc emps; +--------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------+-------------+------+-----+---------+-------+ | id | varchar(10) | | PRI | | | | name | varchar(20) | YES | | NULL | | | resume | text | YES | | NULL | | | photo | blob | YES | | NULL | | +--------+-------------+------+-----+---------+-------+ 4 rows in set (0.00 sec)
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Oracle Database Setup
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$ sqlplus scott/tiger SQL*Plus: Release 10.1.0.2.0 - Production on Fri Oct 7 14:39:09 2005 SQL> desc emp; Name Null Type ----------------------------------------- -------- ---------------------EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO NOT NULL NUMBER(4) VARCHAR2(10) VARCHAR2(9) NUMBER(4) DATE NUMBER(7,2) NUMBER(7,2) NUMBER(2)
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The Solution
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import import import import java.sql.*; javax.sql.*; javax.servlet.*; javax.servlet.http.*;
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CHAPTER 9 WEB ACCESS TO METADATA, PART 2
Create Barcode In .NET Framework
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Code 39 Full ASCII Scanner In Java
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import javax.sql.rowset.WebRowSet; import com.sun.rowset.WebRowSetImpl; import java.io.StringWriter; import java.io.PrintWriter; import java.io.IOException; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class GetRowSetMetaData extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Connection conn = null; try { String dbVendor = request.getParameter("vendor").trim(); String sqlQuery = request.getParameter("query").trim(); conn = VeryBasicConnectionManager.getConnection(dbVendor); // create metadata String metadata = getMetaData(conn, sqlQuery); // write xml to client response.setContentType("text/xml"); PrintWriter out = response.getWriter(); out.println(metadata); } catch(Exception e) { printError(response, e.getMessage()); } finally { DatabaseUtil.close(conn); } } // end doGet private static String getMetaData(Connection conn, String sqlQuery) throws Exception { StringWriter writer = null; try { WebRowSet webRS = new WebRowSetImpl(); webRS.setCommand(sqlQuery); webRS.execute(conn);
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CHAPTER 9 WEB ACCESS TO METADATA, PART 2
PDF417 Maker In Java
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// writer to hold and manipulate XML data. writer = new StringWriter(); // generate the XML document webRS.writeXml(writer); // Convert the writer object data to a XML String. return writer.toString(); } finally { // Close the Writer object. writer.close(); } } private static void printError(HttpServletResponse response, String message) { try { PrintWriter out = response.getWriter(); StringBuffer buffer = new StringBuffer(); buffer.append("<html><body>"); buffer.append(message); buffer.append("</body></html>"); out.println(buffer); } catch(Exception ignore) { } } }
CHAPTER 9 WEB ACCESS TO METADATA, PART 2
Invoking GetRowSetMetaData for MySQL
Figure 9-19 shows how to run the solution for the MySQL database.
Figure 9-19. Invoking GetRowSetMetaData for MySQL (XML output)
CHAPTER 9 WEB ACCESS TO METADATA, PART 2
Invoking GetRowSetMetaData for Oracle
Figure 9-20 shows how to run the solution for the Oracle database.
Figure 9-20. Invoking GetRowSetMetaData for Oracle (XML output)
CHAPTER
RDF and JDBC Metadata
If you find that you re spending almost all your time on theory, start turning some attention to practical things; it will improve your theories. If you find that you re spending almost all your time on practice, start turning some attention to theoretical things; it will improve your practice. Donald E. Knuth
n this chapter, I explore the possibility of expressing JDBC metadata as an RDF application. As of this writing, there is no formal mapping of JDBC metadata into RDF.
10.1. What Is RDF
The Resource Description Framework (RDF) is a W3C (http://www.w3.org) standard (http:// www.w3schools.com/rdf/) for describing web resources, such as the title, author, creation date, modification date, content, content type, and copyright information of a Web page. RDF is written in XML, and its purpose is to describe metadata for web resources. RDF is metadata (data about data) and is used to describe information resources. Databases (data and metadata) are an integral part of web resources, and their contents and associated metadata are accessed by web pages and resources. Therefore, database content and database metadata can be expressed as an RDF notation (actual records and metadata can be expressed in RDF/XML). According to Wikipedia (http://en.wikipedia.org/wiki/Resource_Description_Framework), the Resource Description Framework (RDF) is a family of specifications for a metadata model that is often implemented as an application of XML. The RDF family (http:// www.w3.org/RDF/) of specifications is maintained by the World Wide Web Consortium (W3C). The RDF metadata model is based on the idea of making statements about resources in the form of a subject-predicate-object expression, called a triple in RDF terminology. The subject is the resource, the thing being described. The predicate is a trait or aspect of that resource, and often expresses a relationship between the subject and the object. The object is the object of the relationship or value of that trait. This mechanism for describing resources is a major component in what is proposed by the W3C s Semantic Web activity: an evolutionary stage of the World Wide Web in which automated software can store, exchange, and utilize metadata about the vast resources of the Web, in turn enabling users to deal with those resources with greater efficiency and certainty. RDF s simple data model and ability to model disparate, abstract concepts has also led to its increasing use in knowledge management applications unrelated to Semantic Web activity.
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