JSF-在页面刷新时更新JSF数据表

Question

I have a datatable on my JSF page, which gets filled dynamically on page load thanks to BalusC and Odelya.

But now when I try to refresh the JSF page to retrieve the updated data from database, I don't get the updated data in the Datatable.

I have already gone through the following link but couldn't understand the nuances..!

JSF datatable refresh on page load

Answer 1

Is your bean scope configured as a Session?

Have you tried to change its scope to Request?

Don't forget to close your connection after filling your resultset, which has to be a CachedRowSet

Here is an example from Core JavaServer Faces book:

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.annotation.Resource;
import javax.faces.bean.ManagedBean;
import javax.enterprise.context.RequestScoped;
import javax.sql.DataSource;
import javax.sql.rowset.CachedRowSet;

@ManagedBean
@RequestScoped
public class CustomerBean {
    @Resource(name = "jdbc/mydb")
    private DataSource ds;

    public ResultSet getAll() throws SQLException {
        Connection conn = ds.getConnection();
        try {
            Statement stmt = conn.createStatement();
            ResultSet result = stmt.executeQuery("SELECT * FROM Customers");
            CachedRowSet crs = new com.sun.rowset.CachedRowSetImpl();
            crs.populate(result);
            return crs;
        } finally {
            conn.close();
        }
    }
}

Answer 2

'@RequestScoped' should be added to refresh your bean File to get the new data.