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Chaining deals with the latest wrapped set. As in the preceding jQuery code, we see that the clone of the children of the div element is made the side effect is that there are two wrapped sets now; one is the original child (of the div element) and the other is their clone. In this case, the clone of the children will be inserted before the div element and the CSS class hover is applied to this cloned wrapped set only, not to the original wrapped set. In order to consider the original wrapped set that is, if we want to apply the CSS style rule to the children of the div element (and not to its clone) we make use of the end() method. The end() method, when used in a jQuery chain, backs up to the previous wrapped set and returns it as a value so that the subsequent operations can be applied to it. Let s modify our earlier jQuery code to apply the hover style rule to the actual children of the div element (and not to its clone): $(document).ready(function() { $('div').children().clone().prependTo('div').end().addClass('hover'); }); We can see in the preceding jQuery code that the clone of the children of the div element is made a copy of the paragraph and span elements is made and is added at the beginning of the div element. However, because of the end() command, the original wrapped set (the actual children of the div element) is then returned (and not its clone), and the hover style is applied to that set instead of to the clone. The output is shown in Figure 3-48.

// insert the two new records: stmt.execute("insert into employee(emp, "( EMPLOYEE_TYPE('alex smith', stmt.execute("insert into employee(emp, "( EMPLOYEE_TYPE('bob taylor', } catch (SQLException e) { // handle the exception } finally { // clean up }

In JDBC, errors and exceptions are identified by the java.sql.SQLException class (which extends the java.lang.Exception class). SQLException is a checked exception. There are two types of exceptions in Java: checked and unchecked, or runtime, exceptions. A checked exception is a subclass of java.lang.Throwable (the Throwable class is the superclass of all errors and

age) values "+ 1122), 45)"); age) values "+ 1155), 26)");

Figure 3-48. The hover style rule applied to actual children of the div element instead of to their clone

Suppose you want to retrieve values contained in an Oracle OBJECT type. The following examples show how to retrieve (using SQL*Plus and JDBC) all the records from employee_table.

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exceptions in the Java language) but not of RunTimeException (RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java VM) Checked exceptions have to be caught (and handled properly) or appear in a method that specifies in its signature that it throws that kind of exception When a JDBC object (such as Connection, Statement, or ResultSet) encounters a serious error, it throws a SQLException For example, an invalid database URL, an invalid database username or password, database connection errors, malformed SQL statements, an attempt to access a nonexistent table or view, and insufficient database privileges all throw SQLException objects The client (the database application program) accessing a database server needs to be aware of any errors returned from the server.

This shows how to set up the Oracle database: SQL> desc employee_type; Name Null ---------------- -------NAME BADGE_NUMBER Type ------------VARCHAR2(32) NUMBER

Summary

SQL> SQL> create table employee ( 2 emp employee_type, 3 age NUMBER ); Table created. SQL> desc employee; Name Null ---------------- -------EMP AGE

JDBC give access to such information by providing several levels of error conditions: SQLException: SQLExceptions are Java exceptions that, if not handled, will terminate the client application SQLException is an exception that provides information on a database access error or other errors SQLWarning: SQLWarnings are subclasses of SQLException, but they represent nonfatal errors or unexpected conditions, and as such, can be ignored SQLWarning is an exception that provides information on database access warnings Warnings are silently chained to the object whose method caused it to be reported BatchUpdateException: BatchUpdateException is an exception thrown when an error occurs during a batch update operation In addition to the information provided by SQLException, a BatchUpdateException provides the update counts for all commands that were executed successfully during the batch update, that is, all commands that were executed before the error occurred.

SQL> insert into employee(emp, age) 2 values ( EMPLOYEE_TYPE('alex smith', 1122), 45); SQL> insert into employee(emp, age) 2 values ( EMPLOYEE_TYPE('bob taylor', 1155), 26); SQL> commit; Commit complete. SQL> select * from employee; EMP(NAME, BADGE_NUMBER) --------------------------------EMPLOYEE_TYPE('alex smith', 1122) EMPLOYEE_TYPE('bob taylor', 1155) AGE --45 26

In this chapter we covered different mouse and keyboard events, such as click, dblclick keypress, keydown, and keyup, and we applied various effects to images (e.g. fade in, fade out, slide up etc.). In the next chapter, we will review Form validation Recipes which show how different fields of a form can be validated. We ll also go over the different techiques of finding which HTML element in the form is selected (e.g. whether it is checked or unchecked by the user). Finally, we will be learning how to disable or enable different form elements.

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