Java在dd-MMM-YY中需要时间戳记hh：mm：ss.SSSSSSSSS for Oracle时间戳记（6）

Question

我试图获取时间戳记，以便可以将其添加到Oracle数据库中。数据库有一个TIMESTAMP（6）值。我已经能够直接在值输入用的'12 -sep-12 10点31分19' 秒

现在在Java中的测试日期的查询时，我有以下几点：

Timestamp time_submitted = new Timestamp(System.currentTimeMillis()); 
DateFormat dateFormat = new SimpleDateFormat("dd-MMM-YY hh:mm:ss.SSSSSSSSS"); 

dateFormat.format(time_submitted); 
System.out.println("time_submitted= " + time_submitted); 

我不断收到一些格式如下：

time_submitted= 2017-07-02 22:59:54.733 

，当我尝试将其添加到用一备statment我的数据库查询，我得到异常：

java.sql.SQLIntegrityConstraintViolationException: ORA-01400: cannot insert NULL into ("PROJECT1"."ERS_REIMBURSEMENTS"."REBS_SUBMITTED") 

有什么想法？

编辑：

谢谢大家的反馈意见。这里是我的代码的其余部分连同我试图完成：

FrontController.java file 
// rebs_id IS AUTO INCREMENTING 
int user_id = Integer.parseInt(request.getParameter("author_id")); // must cast string to int 
//int man_id 
int rebs_type = Integer.parseInt(request.getParameter("type")); 
int rebs_status = Integer.parseInt(request.getParameter("status")); 
double rebs_amount = Double.parseDouble(request.getParameter("amount")); 
String rebs_description = request.getParameter("description"); 
//Blob rebs_attachments = getBlob(request.getPart("attachments")); 
Timestamp time_submitted = new Timestamp(System.currentTimeMillis()); 
// Timestamp time_resolved 

DateFormat dateFormat = new SimpleDateFormat("dd-MMM-YY hh:mm:ss.SSSSSSSSS"); 
dateFormat.format(time_submitted); 

RebsObj newReb = new RebsObj(user_id, rebs_type, rebs_status, rebs_amount, rebs_description, time_submitted); 
RebsDAO dao4 = new RebsDAOImpl(); 

dao4.createReimbursement(newReb); // sending newEmp object to RebsDAOImpl for creating 

session = request.getSession(); // grabs the session from request 
session.setAttribute("rebs_id", newReb.getRebsId()); 
session.setAttribute("rebs_user_id", newReb.getUserId()); 
session.setAttribute("rebs_type", newReb.getRebsType()); 
session.setAttribute("rebs_status", newReb.getRebsStatus()); 
session.setAttribute("rebs_amount", newReb.getRebsAmount()); 
session.setAttribute("rebs_description", newReb.getRebsDescription()); 
session.setAttribute("time_submitted", newReb.getTimeSubmitted()); 

RebsDAOImpl.java：

public void createReimbursement(RebsObj reb) { 

    // creating PS which will run queries 
    PreparedStatement ps = null; 

    // looks in util/ConnectionUtil.java and saves the url, username and password to "conn" 
    try(Connection conn = ConnectionUtil.getConnection();){ 

     int rebs_id = 0; // REBS_ID IS AUTO INCREMENTING 
     int user_id = reb.getUserId(); 
     //int man_id = reb.getManagerId(); // not needed 
     int rebs_type = reb.getRebsType(); 
     int rebs_status = reb.getRebsStatus(); 
     double rebs_amount = reb.getRebsAmount(); 
     String rebs_description = reb.getRebsDescription(); 
     // Blob rebs_attachments 
     Timestamp time_submitted = reb.getTimeSubmitted();  
     // Timestamp time_resolved 

     System.out.println("TIME STAMP IN DAO: " + time_submitted); 

     // you can put this string 'sql' into multiple lines by adding +, and having everything within "" 
     // this sql line will be ran on SQL 
     String sql = "INSERT INTO ERS_REIMBURSEMENTS(rebs_id, user_id_author, user_id_resolver, " 
       + "rebs_type, rebs_status, rebs_amount, rebs_description, rebs_receipt, " 
       + "rebs_submitted, rebs_resolved) " 
       + "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" 
       + "RETURNING rebs_id INTO ?"; 

     // creating prepared statement 
     ps = conn.prepareStatement(sql); // uses connection to send string as a prepared statement 
     ps.setString(1, null); // REBS_ID IS AUTO INCREMENTING 
     ps.setInt(2, user_id); 
     ps.setString(3, null); 
     ps.setInt(4, rebs_type); 
     ps.setInt(5, rebs_status); 
     ps.setDouble(6, rebs_amount); 
     ps.setString(7, rebs_description); 
     ps.setString(8, null); 
     ps.setTimestamp(9, time_submitted); 
     ps.setString(10, null); 
     ps.setInt(11, rebs_id); 

     reb.setRebsId(rebs_id); 
     System.out.println("in DAO, rebs_id: " + rebs_id); 
     // rows affected 
     int affected = ps.executeUpdate(); 
     System.out.println("Rows inserted: " + affected); 

而且奖金问题（这我已经试图解决），我试图“RETURN rebs_id”（因为它正在自动增加），但我似乎无法得到

Answer 1

如果您不需要timestamp值的任何行填充一列中的一列，那么你不需要调用System.currentTimeMillis（）。相反，您只需使用SYSTIMESTAMP伪列。但即使你确实需要这个值，你也可以使用DML命令的RETURNING子句，并且你可以找回Oracle使用的东西。