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Is RowSet Scrollable? Explain with an example?
A RowSet object is similar to ResultSet, it also stores tabular data, in addition to the features of a ResultSet. A RowSet follows the JavaBeans component model.
If you Retrieve a ResultSet object by default the cursor of it moves only in forward direction. i.e. you can retrieve the contents of it from first to last.
But, in a scrollable result set, the cursor can scroll forward and backward and you can retrieve data backward too.
To make ResultSet object scrollable, you need to create one as shown below −
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
Whereas, a RowSet object is Scrollable by default. Therefore, whenever the underlying database does not provide a Scrollable ResultSet object you can use RowSet instead.
Example
Assume we have a table named Dispatches in the database with 5 records as shown below −
+-------------+--------------+--------------+--------------+-------+----------------+ | ProductName | CustomerName | DispatchDate | DeliveryTime | Price | Location | +-------------+--------------+--------------+--------------+-------+----------------+ | Key-Board | Raja | 2019-09-01 | 05:30:00 | 7000 | Hyderabad | | Earphones | Roja | 2019-05-01 | 05:30:00 | 2000 | Vishakhapatnam | | Mouse | Puja | 2019-03-01 | 05:29:59 | 3000 | Vijayawada | | Mobile | Vanaja | 2019-03-01 | 04:40:52 | 9000 | Chennai | | Headset | Jalaja | 2019-04-06 | 18:38:59 | 6000 | Goa | +-------------+--------------+--------------+--------------+-------+----------------+
Following JDBC program Retrieves the contents of a RowSet from last to first
import java.sql.DriverManager;
import javax.sql.RowSet;
import javax.sql.rowset.RowSetProvider;
public class ScrolableUpdatableRowSet {
public static void main(String args[]) throws Exception {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Creating the RowSet object
RowSet rowSet = RowSetProvider.newFactory().createJdbcRowSet();
//Setting the URL
String mysqlUrl = "jdbc:mysql://localhost/SampleDB";
rowSet.setUrl(mysqlUrl);
//Setting the user name
rowSet.setUsername("root");
//Setting the password
rowSet.setPassword("password");
//Setting the query/command
rowSet.setCommand("select * from Dispatches");
rowSet.setCommand("SELECT ProductName, CustomerName, Price, Location from Dispatches where price > ?");
rowSet.setInt(1, 2000);
rowSet.execute();
rowSet.afterLast();
while(rowSet.previous()) {
System.out.print("Product Name: "+rowSet.getString("ProductName")+", ");
System.out.print("Customer Name: "+rowSet.getString("CustomerName")+", ");
System.out.print("Price: "+rowSet.getString("Price")+", ");
System.out.print("Location: "+rowSet.getString("Location"));
System.out.println("");
}
}
}Output
Product Name: Headset, Customer Name: Jalaja, Price: 6000, Location: Vijayawada Product Name: Mobile, Customer Name: Vanaja, Price: 9000, Location: Vijayawada Product Name: Mouse, Customer Name: Puja, Price: 3000, Location: Vijayawada Product Name: Key-Board, Customer Name: Raja, Price: 7000, Location: Hyderabad
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