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The final action to take before we start on the event handlers is to set up the page-number display We start this by defining a div element of ID pages and assigning it to the variable $pagenumbers With the help of a for loop, we create a few span elements (equal to the number of pages) that contain the sequence of page numbers 1,2 and the span element is assigned the class name page so that the style properties defined in the class selector page are automatically applied to all the page numbers Finally, all the span elements containing the page numbers are appended to the div element of ID pages To finish the job we insert the div element of ID pages that was stored in the variable $pagenumbers before the table element, which makes the page numbers appear above the table.

Only MySQL s InnoDB table types support the concept of foreign keys (note that MyISAM table types do not support foreign keys). $ mysql --user=root --password=root Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 130 to server version: 4.0.18-nt mysql> use octopus; Database changed mysql> create table dept_table ( -> dept char(2) not null, -> location varchar(8), -> PRIMARY KEY(dept) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.15 sec) mysql> create table emp_table ( -> dept char(2) not null, -> id varchar(5) not null, -> name varchar(10), -> PRIMARY KEY(id), -> INDEX dept_index (dept), -> CONSTRAINT fk_dept FOREIGN KEY(dept) REFERENCES dept_table(dept) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.11 sec) mysql> insert into dept_table(dept, location) values('11', 'Boston'); mysql> insert into dept_table(dept, location) values('22', 'Detroit'); mysql> insert into emp_table(id, name, dept) values('55555', 'Alex', '11'); mysql> insert into emp_table(id, name, dept) values('66666', 'Mary', '22'); mysql> insert into emp_table(id, name, dept) values('77777', 'Bob', '33'); ERROR 1216: Cannot add or update a child row: a foreign key constraint fails mysql> select * from emp_table; +------+-------+------+ | dept | id | name | +------+-------+------+ | 11 | 55555 | Alex | | 22 | 66666 | Mary | +------+-------+------+ 2 rows in set (0.00 sec)

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Here is the code to create a new Connection object from a driver (I will present the output of this section after the code): public static void main(String[] args) { try { java.sql.Driver mysqlDriver = getDriver("org.gjt.mm.mysql.Driver"); String url = "jdbc:mysql://localhost/empDB"; String username = "root"; String password = "root";

Next we attach the hover() event to the page numbers (span element of the class pages) In the event handler, and we highlight the page numbers when the mouse pointer moves over them (The properties defined in the style rule hover are applied to the page numbers, changing their background and foreground color to blue and white respectively) Conversely, when the mouse pointer moves away from them we remove the style properties of the style rule hover After the hover event handler, because we don't want to see any of the data when the page first loads, we hide all the rows (tr elements nested inside the tbody element) of the table, keeping only the column headings visible Only when the user selects a page number will the rows that belongs to that page number be displayed.

java.util.Properties props = new java.util.Properties(); props.put("user", username); props.put("password", password); java.sql.Connection conn = getConnection(mysqlDriver, url, props); System.out.println("conn="+conn); } catch(Exception e) { e.printStackTrace(); } } The output is as follows: getDriver: driver is OK. driver=org.gjt.mm.mysql.Driver@1e63e3d conn=com.mysql.jdbc.Connection@19616c7

mysql> select * from dept_table; +------+----------+ | dept | location | +------+----------+ | 11 | Boston | | 22 | Detroit | +------+----------+ 2 rows in set (0.00 sec)

Sometimes you may want to connect to multiple data sources and view the results of different queries in a single page (such as a Web-based application); for example, you might be getting historic stock market data for comparing two companies, and each set of data might reside in a different database. In some database applications, it is not uncommon to access more than one data source. I have developed a basic Java package called Basic Connection Management (BCM) that enables you to get connections from multiple data sources. For details, please see the jcb.bcm package, as shown in Figure 3-4. Please note that, for saving space, I will show only portions of the BCM package here; you can download the entire code from the book s Web site.

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