谁给我解释下啊
public static final String driveName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
public static final String url = "jdbc:sqlserver://localhost:1433;DatabaseName=test";
public static final String user = "sasa";
public static final String password = "sasa";
public static void main(String[] args) {
  String sql = "select * from dbo.user_table";
  Connection con = null;
  Statement st= null;
  ResultSet rs= null;
  System.out.println("加载驱动程序");
  try {
  Class.forName(driveName).newInstance();
  System.out.println("驱动程序加载成功");
  con = DriverManager.getConnection(url,user,password);
  System.out.println("连接数据库");
  st = con.createStatement();
  rs = st.executeQuery(sql);
  System.out.println("数据库连接成功");
  while(rs.next()){
  System.out.println("name:"+rs.getString("name")+" password:"+rs.getString("password"));
  }
  rs.close();
  st.close();
  con.close();
} catch (Throwable e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
上面的代码执行到“驱动程序加载成功”在向下就不能执行了，请问是什么原因啊，还有DatebaseName 是什么意思啊 数据库名字吗？

------解决方案--------------------

------解决方案--------------------
数据库有没有启动呀