sql获取数据结构

 static{
       try{
        Class.forName("oracle.jdbc.driver.OracleDriver");
       }catch(Exception ex){}
   }
 
 
   public static Connection getConn() {
       try {
        String url= "jdbc:oracle:thin:@192.168.0.88:1521:orcl"; 
        String user="yhqjcpt"; 
        String password="yhqjcpt"; 
        return DriverManager.getConnection(url,user,password);
       } catch (Exception ex) {
        ex.printStackTrace();
           return null;
       }

   }

public List userServer(String isOnline, String isUnusual,String userId,String code,String jddz,String userName){
Statement stmt;
ResultSet rs;
System.err.println(" isUnusual   "+isUnusual);
List<Map<String,Object>> list=new ArrayList<Map<String,Object>>();
try {
stmt = getConn().createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

  String sql ="";
  
rs   = stmt.executeQuery(sql); 
   
Map<String,Object> map;
ResultSetMetaData rsmd;
while(rs.next()){
map=new HashMap<String,Object>();
    rsmd =(ResultSetMetaData)rs.getMetaData();
for (int i=1;i<=rsmd.getColumnCount();i++) {
map.put(rsmd.getColumnName(i), rs.getObject(i));
}
list.add(map);
}
} catch (SQLException e) {
e.printStackTrace();
}
return list;
}