JDBC RowSet - W3spoint

JDBC RowSet is a Java API that provides a way to work with tabular data retrieved from a database using JDBC. It is a disconnected ResultSet, meaning that the data is fetched from the database into memory and then disconnected from the database, allowing the application to work with the data locally without being connected to the database.

JDBC RowSet provides a more flexible and efficient way of working with tabular data compared to ResultSet. It supports scrolling, updating, and inserting data back into the database, as well as serializing and deserializing the data for use across different tiers of a distributed application.

JDBC RowSet can be categorized into four different types:

CachedRowSet: it caches the data locally and allows for disconnected updates and scrolling through the data.
WebRowSet: it provides the same functionality as CachedRowSet but also provides XML-based serialization for easy transfer of data across different tiers of a distributed application.
FilteredRowSet: it allows filtering of data at the client-side before retrieving data from the database, which can reduce the amount of data transferred over the network.
JoinRowSet: it allows joining of data from multiple tables as a single result set.

Overall, JDBC RowSet provides a powerful and flexible way to work with tabular data in Java applications.

Advantage of RowSet:

There are several advantages of using RowSet in Java applications, including:

Offline processing: RowSet allows for offline processing of data retrieved from the database, which means that once the data is fetched from the database, it can be disconnected and processed offline. This reduces the load on the database server and improves the performance of the application.
Disconnected updates: RowSet supports disconnected updates, which means that once the data is fetched from the database, it can be updated offline and then synchronized with the database later. This allows for more efficient use of database resources and reduces network traffic.
Serializable: RowSet is serializable, which means that it can be easily transmitted over the network or stored in a file. This makes it ideal for use in distributed applications.
Scrollable: RowSet supports scrolling, which means that it allows the application to move forwards and backwards through the data as needed. This can be very useful for applications that need to display large amounts of data to the user.
Joining data: JoinRowSet allows joining of data from multiple tables as a single result set. This can simplify the application code and improve performance by reducing the number of database queries needed.

Overall, RowSet provides a more flexible and efficient way to work with tabular data in Java applications, and can help improve application performance and reduce the load on the database server.

Example of JdbcRowSet:

Sure, here’s an example of how to use JdbcRowSet in a Java application:

import java.sql.*;
import javax.sql.rowset.*;

public class JdbcRowSetExample {
   public static void main(String[] args) throws SQLException {
      String url = "jdbc:mysql://localhost:3306/mydatabase";
      String user = "myusername";
      String password = "mypassword";

      // Create a JdbcRowSet instance
      JdbcRowSet rowSet = RowSetProvider.newFactory().createJdbcRowSet();

      // Set the connection parameters
      rowSet.setUrl(url);
      rowSet.setUsername(user);
      rowSet.setPassword(password);

      // Set the query to retrieve data from the database
      rowSet.setCommand("SELECT * FROM mytable");

      // Execute the query
      rowSet.execute();

      // Loop through the results and display them
      while (rowSet.next()) {
         System.out.println("ID: " + rowSet.getInt("id"));
         System.out.println("Name: " + rowSet.getString("name"));
         System.out.println("Age: " + rowSet.getInt("age"));
      }

      // Close the JdbcRowSet
      rowSet.close();
   }
}

Example of JDBC RowSet with Event Handling:

Sure, here’s an example of how to use JDBC RowSet with event handling in a Java application:

import java.sql.*;
import javax.sql.rowset.*;

public class JdbcRowSetEventExample {
   public static void main(String[] args) throws SQLException {
      String url = "jdbc:mysql://localhost:3306/mydatabase";
      String user = "myusername";
      String password = "mypassword";

      // Create a JdbcRowSet instance
      JdbcRowSet rowSet = RowSetProvider.newFactory().createJdbcRowSet();

      // Set the connection parameters
      rowSet.setUrl(url);
      rowSet.setUsername(user);
      rowSet.setPassword(password);

      // Set the query to retrieve data from the database
      rowSet.setCommand("SELECT * FROM mytable");

      // Register a listener to handle events
      rowSet.addRowSetListener(new MyRowSetListener());

      // Execute the query
      rowSet.execute();
   }

   private static class MyRowSetListener implements RowSetListener {
      public void cursorMoved(RowSetEvent event) {
         System.out.println("Cursor moved");
      }

      public void rowChanged(RowSetEvent event) {
         System.out.println("Row changed");
      }

      public void rowSetChanged(RowSetEvent event) {
         System.out.println("RowSet changed");
      }
   }
}

In this example, we first create a JdbcRowSet instance using RowSetProvider.newFactory().createJdbcRowSet(). We then set the connection parameters for the database using setUrl(), setUsername(), and setPassword(). We set the SQL query to retrieve data from the database using setCommand(). We then register a listener to handle events using addRowSetListener(). We create a private class MyRowSetListener that implements the RowSetListener interface and overrides the cursorMoved(), rowChanged(), and rowSetChanged() methods to handle the events. Finally, we execute the query using execute(). When the JdbcRowSet generates events, the appropriate methods in the MyRowSetListener class will be called to handle them.