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The MySQL database does not have a URL data type; however, if you pass a java.net.URL object, the driver converts it to a String object. Using MySQL, define a table that has a column of the VARCHAR type, as shown next: mysql> create table url_table ( -> id varchar(10), -> url varchar(255) ); mysql> desc url_table; +-------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+--------------+------+-----+---------+-------+ | id | varchar(10) | YES | | NULL | | | url | varchar(255) | YES | | NULL | | +-------+--------------+------+-----+---------+-------+ 2 rows in set (0.02 sec) mysql> insert into url_table(id, url) values('ASKJ', 'http://www.askjeeves.com'); mysql> insert into url_table(id, url) values('IBM', 'http://www.ibm.com'); mysql> commit; mysql> select * from url_table; +------+--------------------------+ | id | url | +------+--------------------------+ | ASKJ | http://www.askjeeves.com | | IBM | http://www.ibm.com | +------+--------------------------+ 2 rows in set (0.04 sec)

Here is a simple class to create a RowSetMetaData object. Note the following line of code: RowSetMetaData rsMD = (RowSetMetaData) webRS.getMetaData();

This shows how to run the solution for the MySQL database: $ javac Demo_PreparedStatement_SetURL.java $ java Demo_PreparedStatement_SetURL mysql SUNW "http://www.sun.com" --SetURL begin-conn=com.mysql.jdbc.Connection@124bbbf --------------rowCount=1 --SetURL end--

We can see that the animate() method defined in the event-handling function (of the click event) makes the images scroll to the left and stop at the distance of 160px from the left boundary of the browser window so as to make the whole image of width 150px disappear completely. Thus the value assigned to left represents to what end the image will be animated, and the image will be transitioned from its current state to the value specified. Initially, the image will appear completely, as shown in Figure 6-5.

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This shows the MySQL database after running the solution: mysql> select * from url_table; +------+--------------------------+ | id | url | +------+--------------------------+ | ASKJ | http://www.askjeeves.com | | IBM | http://www.ibm.com | | SUNW | http://www.sun.com | +------+--------------------------+ 3 rows in set (0.00 sec)

WebRowSet.getMetaData() returns a ResultSetMetaData, which has to be cast to the RowSetMetaData object. import import import import java.sql.Connection; javax.sql.RowSetMetaData; javax.sql.rowset.WebRowSet; com.sun.rowset.WebRowSetImpl;

Figure 6-5. Image that appears on loading the web page On clicking the image, it will start scrolling to the left and will disappear slowly, as shown in Figure 6-6.

hat is a JDBC utility A JDBC utility is a small Java component (such as a package, class, interface, or method) that does something useful and should have the following characteristics: It has small, clean, and fast code. It is commonly used by most of the JDBC application programs. Is a safe call (has no possibility for resource leaks). It improves the readability and maintenance of the code. It is portable across databases as well as operating systems (as much as possible). It avoids repetition and improves reliability. This chapter provides a set of JDBC utilities (classes/methods). In general, a utility method should be a public static method, should be as independent as possible (not relying on global data structures and values), and should be defined inside a helper/utility class. For example, javax.imageio.ImageIO is a utility class; it contains static convenience methods for locating ImageReader and ImageWriter objects and performing simple encoding and decoding. Another example is the DbUtils package from Apache (http://jakarta.apache.org/commons/dbutils/); it contains a small set of classes designed to make working with JDBC easier.

JDBC utilities are useful, fast, independent, small, and well-tested classes/methods that are used in most JDBC applications and are the commonly used methods in many classes. The JDBC classes/ methods make working with JDBC easier. For example, closing a Connection object and closing a ResultSet object are considered utility tasks. (These actions will occur in most of the JDBC classes/ methods.) Another example is getting a current date as a java.sql.Date object. You need to organize the utilities (in a helper package/class) and then use them in a consistent fashion in your application or framework.

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