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Now on execution of the jQuery code, if we click the span element, first we will get the alert message because of the execution of the event-handler function of the span element, as shown in Figure 3-43..

The following shows the InsertClobToOracleServlet solution: import java.io.*; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import jcb.db.DatabaseUtil; import jcb.util.IOUtil; public class InsertClobToOracleServlet extends HttpServlet { static final String INSERT_CLOB = "insert into datafiles(id, filename, filebody) values ( , , )"; public static Connection getConnection() throws Exception {... } public void doGet(...) {... } public void doPost(...) {...} public void insertCLOB(...) {....} public static String getClobsContentAsString(...) {...} private static String trimParameter(...) {...} }

Before delving into the solution, let s take a look at the relationships (Figure 4-1) between important low-level interfaces and classes.

Figure 3-43. Alert message of the span element displayed on clicking the span element But after that, the event-handling function of the parent of the span element (that is, the paragraph element) will also be executed, giving us the alert message shown in Figure 3-44.

getConnection()

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The following shows getConnection(): public static Connection getConnection() throws Exception { String driver = "oracle.jdbc.driver.OracleDriver"; String url = "jdbc:oracle:thin:@localhost:1521:caspian"; String username = "scott"; String password = "tiger"; Class.forName(driver); // load Oracle driver return DriverManager.getConnection(url, username, password); }

Figure 3-44. Alert message of the paragraph element executed on account of event bubbling Since event bubbling stops at the root of DOM, the event-handling function of the root (that is, the div element) will also be executed, giving us the output shown in Figure 3-45.

To connect to a database, you use an instance of the Connection class. Then, to find out the names of the database tables and fields, you need to get an instance of the DatabaseMetaData class from the Connection. Next, to issue a query, you compose the SQL query string and use the Connection to create a Statement class. By executing the statement, you obtain a ResultSet class, and to find out the names of the column rows in that ResultSet, you must obtain an instance of the ResultsetMetaData object. To obtain the ResultSet metadata, follow these steps: 1. To connect to a database, you use an instance of the Connection object. 2. To find out the names of the database schemas/tables/columns, you get an instance of the DatabaseMetaData object from the Connection. 3. To issue a query, you compose the SQL query string and use the Connection to create a Statement. 4. By executing the statement, you obtain a ResultSet object. 5. Finally, to find out the names of the column rows in that ResultSet, you obtain an instance of the ResultsetMetaData object.

doGet()

The following shows doGet(): public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

Figure 3-45. Alert message of the div element executed on account of event bubbling Suppose that we click the paragraph element; we will get the alert message of the paragraph element followed by the alert message of the div element. When we click on the div element, only the alert message of the div element will be displayed, as there is no parent of the div element to propagate to. Now run the jQuery code that stops event bubbling; we have made use of the target attribute of the event object for controlling the events and to stop event bubbling. Using the target attribute we can determine which DOM element first received the event and ensure that the event is not propagated to its parent elements automatically. We can see in the modified jQuery code that we determine the target (the element where the click event has occurred) and store it in the $target variable. Then, using if statements, we check, one by one, which element received the click event, and accordingly we send an alert message.

What does ResultSetMetaData provide ResultSetMetaData objects can be used to get information about the types and properties of the columns in a ResultSet object. ResultSetMetaData encapsulates the column s information such as the number of columns, their names, and the column data type and its precision contained in a ResultSet. ResultSetMetaData provides many methods to deal with the column s information; for example, the getColumnName() method of the ResultSetMetaData object returns the column s name in the ResultSet.

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