Connecting JdbcRowSet with a Connection URL

JDBC for MySQL - Herong's Tutorial Examples

∟MySQL - Reference Implementation of JdbcRowSet

∟Connecting JdbcRowSet with a Connection URL

This section describes how to connect a JdbcRowSet object to a database server with a connection URL.

If a JdbcRowSet object is created without a connection to the database server, you can provide a connection URL string by calling the setUrl() method. A connection object will be created later by the JdbcRowSet object with DriverManager when you call the execute() method. Here is a sample sequence of method calls:

// Creating a JdbcRowSet object without connection
  JdbcRowSet jrs = RowSetProvider.newFactory().createJdbcRowSet();

// Provide a connection URL for future use
  jrs.setUrl("connection_url");

// Provide a SQL statement for future use
  jrs.setCommand("SQL_statement");

// Create a connnection using DriverManager
// Execute the SQL statement
  jrs.execute();

Note that the name of method setUrl() is very confusing with another method setURL(), which sets a URL value to a parameter.

Note also that the connection URL and user information can also be provided through another constructor:

  JdbcRowSet jrs = new JdbcRowSetImpl("connection_url",
    "user", "password");

To test connection method, I wrote the following tutorial program:

/* MySqlRowSetConnectionUrl.java
 * Copyright (c) HerongYang.com. All Rights Reserved.
 */
import java.sql.*;
import javax.sql.rowset.RowSetProvider;
import javax.sql.rowset.JdbcRowSet;
public class MySqlRowSetConnectionUrl {
  public static void main(String [] args) {
    String tzid = java.util.TimeZone.getDefault().getID();
    try {

// Not needed anymore
//    Class.forName("com.mysql.jdbc.Driver") ;

// RowSetFactory should be used now
//      JdbcRowSet jrs
//        = new com.sun.rowset.JdbcRowSetImpl();
      JdbcRowSet jrs
        = RowSetProvider.newFactory().createJdbcRowSet();

// Set the connection URL for the DriverManager
      jrs.setUrl("jdbc:mysql://localhost/HerongDB?"
        + "user=Herong&password=TopSecret&serverTimezone="+tzid);

// Set a SQL statement
      jrs.setCommand("SELECT 'Hello world!'");

// Connect and run the statement
      jrs.execute();

// Get the result
      jrs.next();
      System.out.println("Result: "+jrs.getString(1));

// Close resource
      jrs.close();
    } catch (Exception e) {
      System.err.println("Exception: "+e.getMessage());
    }
  }
}

Make sure the MySQL server is running on the local machine, then run this program. The result confirms that the connection is working.

herong> javac MySqlRowSetConnectionUrl.java

herong> java -cp .:mysql-connector-java.jar MySqlRowSetConnectionUrl
Result: Hello world!

Note that if you access the com.sun.rowset.JdbcRowSetImpl class directly, "JdbcRowSet jrs = new com.sun.rowset.JdbcRowSetImpl();", you will get a warning message like this:

MySqlRowSetConnectionUrl.java:16:
warning: com.sun.rowset.JdbcRowSetImpl is Sun proprietary API and
may be removed in a future release
        = new com.sun.rowset.JdbcRowSetImpl();
                           ^
1 warning