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To understand this recipe, you need to know about the map() method. This method iterates through each element of the array and invokes a callback function on each of the array elements. The returned elements can be assigned to another array or the same array if you prefer. The map() method can also iterate through array-like objects that have a length property. Here is the syntax for map(): map(array, callback); The callback function here contains the statements for performing the processing task on the array elements. In our first solution, we want to display the names stored in the array along with serial numbers. We can see that an array members is defined that contains the names we want to display. We next pass this array to the map() method. The callback function in the map() method contains two arguments, n and i, where n refers to the elements of the array (names) being passed to the map() method, and i is the index of the individual array element (index begins with 0). To make the serial numbers begin with 1 instead of 0, we can add 1 to i in each iteration. The values returned by the callback function thus appear as follows: return(i+1+"."+n) This statement returns all the elements of the array one by one with index beginning from 1. The output that we get is as shown in Figure 2-5.

We next invoke the method CachedRowset.execute(): crs.execute(); // load data from custom RowSetReader

Step 1: Preparing the Database (Example 2)

Figure 2-5. Using array mapping to assign serial numbers to elements of the array In the solution that followed, we then used the toUpperCase() method in the callback function to convert into uppercase all the names stored in the array: members=$.map(members, function(n,i){ return(i+1+"."+n.toUpperCase()); }); Recall that the arguments n and i in the callback function refer to the array element and index number respectively. We can see that the application of toUpperCase() to n (that is, the names stored in the array in the form of array elements) converts the names into uppercase and returns them for displaying in the paragraph element. The output will be the names converted to uppercase, along with serial numbers, as shown in Figure 2-6.

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Use a table called animals_table (which is a simple table with two columns): mysql> use octopus; Database changed mysql> desc animals_table; +-------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+----------------+ | id | int(11) | | PRI | NULL | auto_increment | | name | varchar(10) | | | | | +-------+-------------+------+-----+---------+----------------+ 2 rows in set (0.00 sec) mysql> select * from animals_table; +-----+--------+ | id | name | +-----+--------+ | 111 | ginger | | 222 | lola | | 333 | freddy | +-----+--------+ 3 rows in set (0.01 sec)

Finally, we invoke CachedRowset.acceptChanges() to commit changes back to the database. I ve provided a complete solution here. This solution puts together the steps I defined earlier to create a custom RowSet object. You have complete freedom in creating your RowSet object (you even tailor your custom RowSet s metadata). import import import import import import import import import import java.util.Hashtable; java.sql.Types; java.sql.SQLException; javax.sql.RowSetReader; javax.sql.RowSetInternal; javax.sql.RowSetMetaData; javax.sql.rowset.RowSetMetaDataImpl; javax.sql.rowset.CachedRowSet; com.sun.rowset.CachedRowSetImpl; javax.sql.rowset.spi.SyncFactory;

* to be automatically released. * @param pstmt a PreparedStatement object. */ public static void close(java.sql.PreparedStatement pstmt) { if (pstmt == null) { return; } try { pstmt.close(); // PreparedStatement object is closed now } catch(Exception ignore) { // ignore the exception // could not close the PreparedStatement // cannot do much here } }

top boundary of the news box, when all the paragraph text is scrolled up (becomes invisible). This scrolling will happen quite slowly, as the duration of animation is set to 5000 milliseconds. In the callback function of the animate method (that is executed when the animation is over), we make the paragraph text appear at the distance of 250px from the top border of the window, making only the first line of the paragraph text appear from the bottom boundary of the window. After that, the animator function is called recursively to make the paragraph text scroll infinitely. Initially the paragraph text that is able to fit in the height and width of the window will be visible, as shown in Figure 6-15.

If you are using a connection pool manager (to manage a set of database Connection objects), then you need to release (this is called a soft close) the Connection object to the connection pool manager; otherwise, you can use the close() method, which releases this Connection object s database and JDBC resources immediately instead of waiting for them to be automatically released. The following code listing shows some sample code for closing a Connection object; it is always a good idea to have utility classes close these JDBC resources: /** * Close the Connection object. Releases the Connection * object's database and JDBC resources immediately instead * of waiting for them to be automatically released. * @param conn a Connection object. */ public static void close(java.sql.Connection conn) { if (conn == null) { return; } try { if (!conn.isClosed()) { // close the Connection object conn.close(); } // Connection object is closed now } catch(Exception ignore) { // ignore the exception // could not close the Connection object // cannot do much here } }

public class DemoCustomRowSet { CachedRowSet crs; String stringColumn1; String stringColumn3; int intColumn2;

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