Question

我正在尝试获取时间戳，以便我可以添加到我的Oracle数据库中。 DB具有TIMESTAMP（6）值。我已经能够直接输入一个测试日期为'12 -SEP-12 10:31:19'的查询值

现在在java中，我有以下内容：

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);

我一直以这种格式得到一些东西：

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

当我尝试使用准备好的语句将其添加到我的数据库查询时，我得到例外：

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

有什么想法吗？

编辑：

谢谢大家的反馈。这是我的其余代码以及我想要完成的任务：

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);

也是奖金问题（我已经尝试解决），我正在尝试“RETURN rebs_id”（因为它正在自动递增）但我似乎无法得到那个

Answer 1

如果除了填充行中的列之外不需要时间戳值，则不需要调用System.currentTimeMillis（）。相反，您只需要使用SYSTIMESTAMP伪列。但是，即使您确实需要该值，也可以使用DML命令的RETURNING子句，并且可以返回Oracle使用的内容。

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

1 个答案: