Java how to use cachedrowset in jdbc


The CachedRowSet class is a RowSet implementation that provides a way to cache its data in memory. It is a disconnected RowSet which means it does not maintain an active connection to the database, but instead it stores the data in memory, which makes it more efficient and faster than other RowSet implementations.

Here is an example code snippet that demonstrates how to use CachedRowSet in JDBC:

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

public class CachedRowSetExample {
    public static void main(String[] args) throws SQLException {
        String url = "jdbc:mysql://localhost:3306/mydb";
        String username = "root";
        String password = "mypassword";

        try (Connection conn = DriverManager.getConnection(url, username, password)) {
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT * FROM mytable");

            // Create a new CachedRowSet
            CachedRowSet cachedRowSet = RowSetProvider.newFactory().createCachedRowSet();

            // Close the ResultSet and Statement

            // Modify the data in the CachedRowSet
            cachedRowSet.updateString("name", "John Smith");

            // Update the database with the changes in the CachedRowSet

This code retrieves a ResultSet from a database, populates a new CachedRowSet with the data, modifies the data in the CachedRowSet, and then updates the database with the changes made to the CachedRowSet.

The RowSetProvider class is a part of the javax.sql.rowset package, which is used to obtain a factory for RowSet objects. The createCachedRowSet() method of this factory is used to create a new CachedRowSet object.

The populate() method of the CachedRowSet class is used to populate the CachedRowSet with the data from the ResultSet. This method closes the ResultSet and the statement used to create it. The CachedRowSet object can be modified in the same way as a ResultSet, by calling the appropriate update and get methods.

The acceptChanges() method is called to update the database with the changes made to the CachedRowSet. This method uses the Connection object to update the database.

Note that CachedRowSet can also be used to move the data between tiers or between different layers of an application, making it a powerful tool for managing data in a distributed application.