jdbc的问题,急!!!!!

Question

try {
                Class.forName ("oracle.jdbc.driver.OracleDriver");
                connection = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:G", "G", "G");
            } catch(ClassNotFoundException clsex) {
                            }
            catch(SQLException sqlex) {
                         }

Answer 1

class connetionJDBC{//建立连接类  Connection con;
  
  
  public Connection getConnection(){
            try {
                Class.forName ("oracle.jdbc.driver.OracleDriver");
                con = DriverManager.getConnection("jdbc:oracle:thin:@url", "user", "password");
                return con;
            } catch(Exception clsex) {
                return null;
            }
  
  }}
class userJDBC{//对数据库操作类
   connetionJDBC test;
   Connection conn = null;
   PreparedStatement pstmt = null;
   ResultSet rs = null;
   String sql="select....";
   userJDBC(){
    try {
     con = test.getConnection();
     pstmt = conn.prepareStatement("sql");
     rs = pstmt.executeQuery();
     while(rs.next()) {
 listFormhashtable.put(rs.getString("id"),rs.getString("name"));
     }
     } catch(Exception clsex) {    }
   
   }
}

Answer 2

package bbs;
import java.sql.*;public class cn
{
String cline="com.microsoft.jdbc.sqlserver.SQLServerDriver";
String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=xiruo";
String user="sa";
String pass="";
Connection conn=null;
ResultSet rs=null;public cn() {
try {
Class.forName(cline);
}
catch(java.lang.ClassNotFoundException e)
{
System.err.println("classnotfound:"+e.getMessage());
}
}public ResultSet executeQuery(String sql) {
rs=null;
try {
conn=DriverManager.getConnection(url,user,pass);
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
rs=stmt.executeQuery(sql);
}
catch(SQLException e) {
System.err.println("SQL error:"+e.getMessage()+"\r\n"+sql);
}
return rs;
}public void executeUpdate(String sql) {
try {
conn=DriverManager.getConnection(url,user,pass);
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
stmt.executeUpdate(sql);
}
catch(SQLException e) {
System.err.println("SQL error:"+e.getMessage()+"\r\n"+sql);
}
}
}