Question

我有一个包含44列的CSV，并且有一个包含21列的表。需要检查CSV中的列以及与数据库表中的列和数据匹配的数据

我创建了2个类（其中一个主要类），在该类中我已读取CSV文件并将值存储在“键-值”对中。我在另一个类中执行选择查询以获取结果。现在，我陷入了如何根据列及其数据比较这两件事的问题

预期：csv中的列数以及数据应与数据库表中存在的列匹配

// MAIN CLASS-在其中CSV读取并存储在键=值对中

 public static void main(String[] args) throws JSchException {
      CassandraConnection c=new CassandraConnection();
    Session session = null;
       try {
             session = jsch.getSession(user, host, port);
         } catch (JSchException e) {
                // TODO Auto-generated catch block
           e.printStackTrace();
         }
       //Session to connect with FTP//
       InputStream stream = null;
       try {
           stream = sftpChannel.get("file path");
           System.out.println("File read");
       } catch (SftpException e1) {
                // TODO Auto-generated catch block
               e1.printStackTrace();
       }
       try {
           BufferedReader br = new BufferedReader(new            
            InputStreamReader(stream));
            Iterable<CSVRecord> records = 
            CSVFormat.DEFAULT.withFirstRecordAsHeader()                                                                        
             .withIgnoreEmptyLines(true).withDelimiter(',').withTrim()                                                                      
             .parse(br);
             System.out.println("Printing records having COLUMN 4 > 0");
             java.util.List<Map<String, String>> finResult = 
             StreamSupport.stream(records.spliterator(), 
             false).filter(csvRecord -> 
             Integer.parseInt(csvRecord.get("COLUMN 4"))>0).map(csvRecord 
             -> 
         csvRecord.toMap().entrySet().stream().collect(Collectors.toMap(e 
         -> e.getKey(),e -> e.getValue()))).collect(Collectors.toList());
         size = finResult.size();
         System.out.println(size);
         for (Map<String, String> map : finResult) {
         System.out.println(finResult);
    }
    br.close();
 }             
 catch (IOException io) {
  System.out.println("Exception occurred during reading file from SFTP 
  server due to " + io.getMessage());
  io.getMessage();
} catch (Exception e) {
System.out.println("Exception occurred during reading file from SFTP 
server due to " + e.getMessage());
e.getMessage(); }}}

将CSV中的列与JAVA中数据库表中的列进行比较

0 个答案: