连接oracle，sqlserver中数据库的示例代码

一 在Oracle中连接数据库
public class Test1 {
 public static void main(String[] args) {
  try {
   Class.forName("oracle.jdbc.driver.OracleDriver");
   Connection conn = DriverManager.getConnection(
                           主机名 端口 SID      帐号    密码
     "jdbc:oracle:thin:@haha:1521:oracle", "hehe", "a");
   Statement stt = conn.createStatement();
   ResultSet rs = stt.executeQuery("select * from emp");
   while (rs.next()) {
    System.out.print(rs.getObject(2).toString());
    System.out.println("\t" + rs.getObject(3).toString());
   }
   rs.close();
   stt.close();
   conn.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}
二 在sqlserver中连接数据库
public class DBManager {
 String url="jjdbc:microsoft:sqlserver://localhost:1433;databaseName='student'";
 String driver ="com.microsoft.jdbc.sqlserver.SQLServerDriver";
 String useName="sa";
 String pwd="sa";
 Connection con =null;
 Statement sta=null;
 ResultSet rs=null;
 
 public ResultSet getQiery(String sql)
 {
  try {
   Class.forName(driver);
   con =DriverManager.getConnection(url,useName,pwd);
   sta = con.createStatement();
   rs =sta.executeQuery(sql);
  } catch (Exception e) {
        e.printStackTrace();
  }
  return rs;
 }
 public int getUpd(String sql)
 {
  int i=0;
  try {
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