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In a three-tier model for JDBC, the actual application logic runs on the middle tier. In general, tree-tier models are more scalable than two-tier models, because it is easy to add middle-tier and data-server tiers easily. For some JDBC applications, three-tier architecture can be slow because of an additional level of communication. But you can use connection pool management and caching services to improve the overall performance. Also, you can optimize your SQL queries for better performance.

For example, $('tr:nth-child(3)'); will select all the tr elements that are third child of their parent (which may be the tbody or table element); that is, it will select the third row of the table. Similarly, the statement $('tr:nth-child(even)'); will select all the even rows of the table. In the preceding jQuery code, the statement $('td:nth-child(odd)').addClass('hover'); will select all the odd columns of the table (in other words, each td that is an odd child of its parent) and apply the style properties defined in the style rule hover to them, changing their background color to blue and their foreground color to white, as shown in Figure 7-3.

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Figure 2-4 represents a typical three-tier model. In this model, a client application (for example, a browser) communicates with a Java servlet/JSP in a Web server (such as Tomcat from the Apache Software Foundation) using Hypertext Transfer Protocol (HTTP) or HTTP Over SSL (HTTPS). (Tomcat is the servlet container that is used in the official reference implementation for the Java servlet and JSP technologies. For details, see the official Web site at http://jakarta.apache.org/tomcat/ index.html.) The Java code (servlet/JSP) in the Web server uses the JDBC API to access the relational database server.

/** * Get the Oracle table names for a given connection object. * If you use getViewNames() for an Oracle database, you * will get lots of auxiliary tables, which belong to the user, * but the user is not interested in seeing them. * * @param conn the Connection object * @return the list of table names as a List. * @exception Failed to get the table names from the database. */ public static List<String> getOracleViewNames(Connection conn) throws Exception { Statement stmt = null; ResultSet rs = null; try { stmt = conn.createStatement(); rs = stmt.executeQuery(ORACLE_VIEWS); if (rs == null) { return null; } List<String> list = new ArrayList<String>(); while (rs.next()) { String viewName = DatabaseUtil.getTrimmedString(rs, 1); System.out.println("viewName="+viewName); if (viewName != null) { list.add(viewName); } }

To highlight alternate rows of the table, we will modify the jQuery code as shown here: $(document).ready(function() { $('table tr:odd').addClass('hover'); });

You get a clear separation of the user interface control and data presentation from the application logic in a three-tier model. This means these components can be developed independently (as long as the interfaces among tiers are well defined). Changes in the data-server tier (such as adding new tables and adding/modifying columns to existing tables) will not impact the clients because clients do not access the data-server tier directly. Dynamic load balancing is another advantage of a three-tier architecture for JDBC. You can tackle performance problems easier than two-tier models: if a performance problem happens, you can add additional middle-tier servers or move the server process to other servers at runtime.

Relativity teaches us the connection between the different descriptions of one and the same reality. Albert Einstein

return list; } finally { DatabaseUtil.close(rs); DatabaseUtil.close(stmt); } } /** * Get the table names for a given connection object. * @param conn the Connection object * @return the list of table names as a List. * @exception Failed to get the table names from the database. */ public static List<String> getViewNames(Connection conn) throws Exception { ResultSet rs = null; try { DatabaseMetaData meta = conn.getMetaData(); if (meta == null) { return null; } rs = meta.getTables(null, null, null, DB_VIEW_TYPES); if (rs == null) { return null; } List<String> list = new ArrayList<String>(); System.out.println("getViewNames(): --------------"); while (rs.next()) { String viewName = DatabaseUtil.getTrimmedString(rs, COLUMN_NAME_VIEW_NAME); System.out.println("viewName="+viewName); if (viewName != null) { list.add(viewName); } } System.out.println("--------------"); return list; } finally { DatabaseUtil.close(rs); } } }

The preceding jQuery code will select all the odd rows of the table and apply the style properties defined in the style rule .hover to them so as to highlight them as shown in Figure 7-4.

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