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We treat MySQL and Oracle differently, because Oracle s driver returns extra tables for DatabaseMetaData.getTables(). To eliminate this problem, for Oracle s tables and views, I use the following SQL query: select object_name, object_type from user_objects where object_type = 'TABLE' or object_type = 'VIEW' Because of all these differences, I provide an additional method (getOracleTableAndViewNames()) to handle Oracle s special case. This again proves that the database vendor factor is a crucial one for handling data and metadata for JDBC applications. Here is a complete solution (the GetTablesAndViews servlet) for getting tables and views: import java.io.PrintWriter; import java.io.IOException; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.Map; import java.util.Map.Entry; import java.util.HashMap; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class GetTablesAndViews extends HttpServlet { private static final String ORACLE_TABLES_AND_VIEWS = "select object_name, object_type from user_objects "+ "where object_type = 'TABLE' or object_type = 'VIEW'"; private static final String[] DB_TABLE_AND_VIEW_TYPES = { "TABLE", "VIEW" }; private static final String COLUMN_NAME_TABLE_NAME = "TABLE_NAME"; private static final String COLUMN_NAME_TABLE_TYPE = "TABLE_TYPE"; 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); Map<String, String> tablesAndViews = null;

static Connection getConnection (String url, String user, String password)

You must first establish a connection with the relational DBMS you want to use. This involves two steps: 1. Loading the driver 2. Making the connection

Figure 7-8. A row gets highlighted when hovered over. On clicking any row, all rows will become invisible except the one that was clicked, as shown in Figure 7-9.

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Loading the driver or drivers you want to use is simple. For example, if you want to use the JDBC-ODBC bridge driver, use the following code, which will load the driver: java.lang.String driverName = "sun.jdbc.odbc.JdbcOdbcDriver"; java.lang.Class driverClass = java.lang.Class.forName(driverName); Alternatively, you can write the following (ignoring the return of the forName() method): java.lang.String driverName = "sun.jdbc.odbc.JdbcOdbcDriver"; java.lang.Class.forName(driverName); A call to forName("X") causes the class named X to be initialized. Your driver documentation will give you the class name to use. For instance, if the class name is org.gjt.mm.mysql.Driver (this driver is for the MySQL database), you would load the driver with the following line of code: java.lang.String driverName = "org.gjt.mm.mysql.Driver"; java.lang.Class.forName(driverName);

if (dbVendor.equals("oracle")) { tablesAndViews = getOracleTablesAndViews(conn); } else { tablesAndViews = getTablesAndViews(conn); } if (tablesAndViews == null) { printError(response, "NO-TABLES-OR-VIEWS-FOUND"); return; } if (outputFormat.equals("xml")) { printXML(response, tablesAndViews); } else { printHTML(response, tablesAndViews); } } catch(Exception e) { printError(response, e.getMessage()); } finally { DatabaseUtil.close(conn); } } // end doGet private static void printHTML(HttpServletResponse response, Map<String, String> tablesAndViews) 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>Table/View Name</TH><TH>Type</TH></TR>"); for (Map.Entry<String, String> e : tablesAndViews.entrySet()) { buffer.append("<TR><TD>"); buffer.append(e.getKey()); buffer.append("</TD><TD>"); buffer.append(e.getValue()); buffer.append("</TD></TR>"); } buffer.append("</table></body></html>"); out.println(buffer.toString()); }

We can modify the preceding jQuery code to reverse the process; that is, instead of keeping the selected row, we can hide it. The jQuery code is as follows: $(document).ready(function() { $('tbody tr').hover( function(){ $(this).find('td').addClass('hover'); }, function(){ $(this).find('td').removeClass('hover'); } ); $('tbody tr').click(function(){ $(this).hide(); }); }); We can see in the jQuery code that the selected row is hidden with the hide() method. On hovering over the last row, the table may appear as shown in Figure 7-8, and on clicking on that row, it is erased and the remaining table will appear as shown in Figure 7-10.

Please note that you do not need to create an instance of a driver and register it with the DriverManager class, because calling ClassforName() will do that for you automatically (This is a singleton class, and therefore it doesn t have any public constructors) If you were to create your own instance, you would be creating an unnecessary duplicate, but it would do no harm When you have loaded a driver, it is available for making a connection with a relational DBMS For the driver to be successfully loaded, the driver class must be in the CLASSPATH environment variable; otherwise, these code fragments will throw an exception For example, if you want to use the Oracle 9i (Oracle 8i) database, then you need to include the ojdbcjar file in classes12zip (provided by Oracle) in the CLASSPATH environment variable.

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