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Figure 3-29. The text Return to top appears after every paragraph. If we click any of the Return to top links we will be navigated to the beginning of the web page.

SQL> select * from roles_table; ROLE DESCRIPTION ----- ---------------------dba database administrator mgr database manager dev database developer SQL> select * from emps_table;

The java.sql.Connection interface has factory methods for creating Statement and PreparedStatement objects. A Statement object is created with the Connection method createStatement(): once a Statement object is created, you may execute any number of SQL queries with that Statement object. Connection conn = null; Statement stmt = null; ResultSet rs = null; try { // get a Connection object conn = getConnection(); // create Statement object: once Statement object is // created, you can execute queries, send SQL statements // to the database, and then get the results back stmt = conn.createStatement(); // create a result set String sqlQuery = "SELECT badge_number FROM employee_table"; rs = stmt.executeQuery(sqlQuery); // iterate the result set object, and get all the data while (rs.next()) { int badgeNumber = rs.getInt(1); }

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You have a large chunk of text to display, but to keep the screen neat you want to display just a few lines of it along with a link to Read More attached to it. When the user selects this link, the rest of the text (which was hidden) is displayed.

// create another result set String sqlQuery2 = "SELECT dept_id, dept_name FROM dept_table"; rs = stmt.executeQuery(sqlQuery2); // iterate the result set object, and get all the data while (rs.next()) { int deptID = rs.getInt(1); String deptName = rs.getString(2); } } catch (SQLException e) { // could not create a Statement object, or other // problems happened; handle the exception } finally { // close database/JDBC resources such as // ResultSet(s), Statement(s), and Connection(s) } The JDK defines the Connection.createStatement() method as follows: public Statement createStatement() throws SQLException The JDK also says this: Creates a Statement object for sending SQL statements to the database. SQL statements without parameters are normally executed using Statement objects. If the same SQL statement is executed many times, it may be more efficient to use a PreparedStatement object. Result sets created using the returned Statement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY. It returns a new default Statement object. It throws a SQLException if a database access error occurs.

BADGE NAME EMAIL ----- ---- -------------11111 Alex alex@yahoo.com 22222 Mary mary@yahoo.com SQL> select * from emps_roles; BADGE ROLE ----- ----11111 dev 11111 mgr 22222 dba DatabaseMetaData.getImportedKeys() Signature public ResultSet getImportedKeys(String catalog, String schema, String table) throws SQLException This method retrieves a description of the primary key columns that are referenced by a table s foreign key columns (the primary keys imported by a table). They are ordered by PKTABLE_CAT, PKTABLE_SCHEM, PKTABLE_NAME, and KEY_SEQ. Each primary key column description has the columns shown in Table 3-5. Table 3-5. ResultSet Object s Columns for Invoking getImportedKeys()

I have developed a servlet, DisplayOracleClobAsURLServlet, that accepts the ID of a file and displays the associated file. For example, if id=200, then you will get the screen shown in Figure 8-13.

Let s make an HTML file with two div elements and a span element of the class readmore in between them, as shown here: <body> <div> Styles make the formatting job much easier and more efficient. </div> <span class="readmore">Read More...</span> <div class="message"> To give an attractive look to web sites, styles are heavily used. JQuery is a powerful JavaScript library that allows us to add dynamic elements to our web sites. Not only it is easy to learn, but it's easy to implement too. A person must have a good knowledge of HTML and CSS and a bit of JavaScript. jQuery is an open source project that provides a wide range of features with cross-platform compatibility. </div> </body> Let s write the jQuery code to make the lower div element invisible and attach the click event to the Read More text along with an inline function that makes the lower div element visible on occurrence of the click event: $(document).ready(function() { $('.message').hide(); $('span.readmore').click(function(){ $('.message').show('slow'); $(this).hide(); }); });

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