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The jQuery code to create a hyperlink with the text Return to top after every paragraph element and make that text navigate to the beginning of the web page is shown here: $(document).ready(function() { $('<a href="#topofpage">Return to top</a>').insertAfter('p'); $('<a id="topofpage" name="topofpage"></a>').prependTo('body'); });

Say you want to send your SQL statements to query the database or create database objects (such as new records/row, tables, and views). How do you do that A Statement object is what sends your SQL statement (whether you re creating a table or selecting rows from a table) to the database server. According to the JDK, the Statement object is used for executing a static SQL statement and returning the results it produces. The Statement interface has about 40 methods. You simply create a Statement object and then execute it, supplying the appropriate execute method with the SQL statement you want to send. For a SELECT statement, the method is executeQuery(). For statements that create or modify tables, the method to use is executeUpdate(). JDK defines the java.sql.Statement as follows: public interface Statement

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The JDK also says this: The object used for executing a static SQL statement and returning the results it produces By default, only one ResultSet object per Statement object can be open at the same time Therefore, if the reading of one ResultSet object is interleaved with the reading of another, each must have been generated by different Statement objects All execution methods in the Statement interface implicitly close a statement s current ResultSet object if an open one exists If you want to execute a Statement object many times, you can use a PreparedStatement object instead of Statement to reduce execution time (For details, see 12) The main feature of a PreparedStatement object is that, unlike a Statement object, it is given a SQL statement when it is created.

The statement $('<a href="#topofpage">Return to top</a>').insertAfter('p'); adds a hyperlink with the text Return to top after every paragraph element of the HTML file, and when the link is selected by the user, he will be navigated to the element of id topofpage. The statement $('<a id="topofpage" name="topofpage"></a>').prependTo('body'); adds an anchor element with name and id assigned to it as topofpage before the body of the HTML file. In other words, an anchor element of id topofpage is created at the beginning of the web page. The output that we may get on execution of the preceding jQuery code is as shown in Figure 3-29.

create table emps_roles ( badge_number varchar(5) not null, role varchar(5) not null, primary key (badge_number, role), foreign key (badge_number) references emps_table(badge_number), foreign key (role) references roles_table(role) ); insert into roles_table(role, description) values('dba', 'database administrator'); insert into roles_table(role, description) values('mgr', 'database manager'); insert into roles_table(role, description) values('dev', 'database developer'); insert into emps_table(badge_number, name, email) values('11111', 'Alex', 'alex@yahoo.com'); insert into emps_table(badge_number, name, email) values('22222', 'Mary', 'mary@yahoo.com'); insert into emps_roles(badge_number, role) values('11111', 'mgr'); insert into emps_roles(badge_number, role) values('11111', 'dev'); insert into emps_roles(badge_number, role) values('22222', 'dba');

The advantage to this is that in most cases this SQL statement will be sent to the database server right away, where it will be compiled As a result, the PreparedStatement object contains not just a SQL statement but also a SQL statement that has been precompiled This means that when the PreparedStatement is executed, the database server can just run the PreparedStatement object s SQL statement without having to compile/parse/check semantics first When the database prepares a Statement object, it creates a query plan A query plan indicates to the database how (using which indexes and other criteria) the SQL query will be executed Note that Statement prepares and executes the query plan each time, while PreparedStatement prepares the query plan just once and then reuses the query plan Preparing a statement is also referred to as precompiling a statement.

A Statement object executes simple SQL statements with no parameters, and a PreparedStatement object can execute SQL statements with any number of input parameters From the performance point of view, if the same SQL statement is executed many times, it may be more efficient to use a PreparedStatement object..

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