java链接MySQL内存数据库

package a;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class Main {
	private static Connection c = null;
	private static PreparedStatement ps = null;
	private static PreparedStatement ps2 = null;
	private static ResultSet rs = null;

	public static void main(String[] args) {
		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			c = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydata?characterEncoding=gbk", "root", "");
			ps = c.prepareStatement("select * from t_user");
			rs = ps.executeQuery();
			while (rs.next()) {
				ps2 = c.prepareStatement("insert into t_user_Memory values (null, ?, ?)");
				ps2.setString(1, rs.getString(2));
				ps2.setString(2, rs.getString(3));
				ps2.executeUpdate();

			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (rs != null) {
					rs.close();
					rs = null;
				}
				if (ps2 != null) {
					ps2.close();
					ps2 = null;
				}
				if (ps != null) {
					ps.close();
					ps = null;
				}
				if (c != null) {
					c.close();
					c = null;
				}
			} catch (Exception e) {
				// TODO: handle exception
			}
		}

	}

}