c# barcode reader event WEB ACCESS TO METADATA, PART 1 in Font

Creator PDF417 in Font WEB ACCESS TO METADATA, PART 1

CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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Figure 8-12 shows how to run the solution for handling errors.
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Figure 8-12. Invoking GetTables to handle errors
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8.11. How Do You Get a List of View Names for a Database
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What is a view According to Wikipedia, In database theory, a view is a virtual or logical table composed of the result set of a pre-compiled query. Unlike ordinary tables in a relational database, a view is not part of the physical schema: it is a dynamic, virtual table computed or collated from data in the database. Changing the data in a view alters the data stored in the database. Both MySQL (version 5+) and Oracle support the creation and use of database views.
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Oracle Database Setup
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SQL> desc employees; Name ----------------------------------------ID NAME AGE SQL> select * from employees; ID NAME AGE ---------- -------------------- ---------11 Alex Smith 25 22 Don Knuth 65 33 Mary Kent 35 44 Monica Seles 30 99 Alex Edison 80 100 Al Sumner 70 105 Al Sumner 90 Null -------NOT NULL NOT NULL Type ------------VARCHAR2(10) VARCHAR2(20) NUMBER(38)
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7 rows selected. SQL> select object_name from user_objects where object_type ='VIEW'; no rows selected SQL> create view emp55plus as 2 select name, age from employees where age > 55; View created.
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CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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SQL> desc emp55plus; Name ----------------------------------------NAME AGE SQL> select * from emp55plus; NAME AGE -------------------- ---------Don Knuth 65 Alex Edison 80 Al Sumner 70 Al Sumner 90 SQL> create view empids as 2 select id from employees; View created. SQL> desc empids; Name ----------------------------------------ID SQL> select * from empids; ID ---------100 105 11 22 33 44 99
Null Type -------- ------------NOT NULL VARCHAR2(20) NUMBER(38)
Null Type -------- -----------NOT NULL VARCHAR2(10)
7 rows selected. SQL> select object_name from user_objects where object_type ='VIEW'; OBJECT_NAME -------------------------------------------------------------------EMP55PLUS EMPIDS SQL>SQL> commit; Commit complete.
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
MySQL Database Setup
mysql> use octopus; Database changed mysql> desc employees; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | id | varchar(8) | NO | PRI | | | | name | varchar(16) | YES | | NULL | | | age | int(11) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 3 rows in set (0.00 sec) mysql> select * from employees; +-----+--------+------+ | id | name | age | +-----+--------+------+ | 88 | Peter | 80 | | 77 | Donald | 70 | | 33 | Mary | 30 | | 44 | Monica | 40 | | 999 | Andre | 90 | +-----+--------+------+ 5 rows in set (0.00 sec) mysql> create view emps55plus as select name, age from employees -> where age > 55; Query OK, 0 rows affected (0.39 sec) mysql> desc emps55plus; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | name | varchar(16) | YES | | NULL | | | age | int(11) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 2 rows in set (0.02 sec) mysql> select * from emps55plus; +--------+------+ | name | age | +--------+------+ | Peter | 80 | | Donald | 70 | | Andre | 90 | +--------+------+ 3 rows in set (0.00 sec)
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
The Solution
import java.io.PrintWriter; import java.io.IOException; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.List; import java.util.ArrayList; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; import jcb.meta.DatabaseMetaDataTool; public class GetViews extends HttpServlet { private static final String ORACLE_VIEWS = "select object_name from user_objects where object_type = 'VIEW'"; private static final String[] DB_VIEW_TYPES = { "VIEW" }; private static final String COLUMN_NAME_VIEW_NAME = "TABLE_NAME"; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Connection conn = null; try { String dbVendor = request.getParameter("vendor").trim(); String outputFormat = request.getParameter("format").trim(); conn = VeryBasicConnectionManager.getConnection(dbVendor); List<String> views = null; if (dbVendor.equals("oracle")) { views = getOracleViewNames(conn); } else { views = getViewNames(conn); } if (views == null) { printError(response, "NO-VIEWS-FOUND"); return; }
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
if (outputFormat.equals("xml")) { printXML(response, views); } else { printHTML(response, views); } } catch(Exception e) { printError(response, e.getMessage()); } finally { DatabaseUtil.close(conn); } } // end doGet private static void printHTML(HttpServletResponse response, List<String> views) throws Exception { response.setContentType("text/html"); PrintWriter out = response.getWriter(); StringBuilder buffer = new StringBuilder(); buffer.append("<html><body><table border=1 cellspacing=0 cellpadding=0>"); buffer.append("<TR><TH>View Name</TH></TR>"); for (int i=0; i < views.size(); i++) { buffer.append("<TR><TD>"); buffer.append(views.get(i)); buffer.append("</TD></TR>"); } buffer.append("</table></body></html>"); out.println(buffer.toString()); } private static void printXML(HttpServletResponse response, List<String> views) throws Exception { response.setContentType("text/xml"); PrintWriter out = response.getWriter(); StringBuilder buffer = new StringBuilder(); buffer.append("< xml version=\"1.0\" encoding=\"ISO-8859-1\" >"); buffer.append("<views>"); for (int i=0; i < views.size(); i++) { buffer.append("<name>"); buffer.append(views.get(i)); buffer.append("</name>"); } buffer.append("</views>"); out.println(buffer.toString()); }
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