将String转换为TIMESTAMP，以便从servlet java插入到数据库oracle中

Question

I'm trying to insert a date into a TIMESTAMP field in an Oracle database from a servlet. but when I do the insert, I get an error: "ORA-01843: month not valid"

The type of date I see in the table where the date is is this: 05-FEB-19 09.36.10.000000000 AM and I declared it when the table was created as a TIMESTAMP type.

In JSP file i have this 2 input type:

<label>Data
<input type="date" name="date" value="13-AUG-2019" required>
</label>
<label>Time
<input type="time" name="time" value="11:00:00 AM" required>
</label>

In a Servlet Java i have this:

    String data= request.getParameter("date");
    String time= request.getParameter("time");
    String paramData = data.replaceAll("\n", "");
    String paramTime = time.replaceAll("\n", "");
    String dataTime = paramData + " " + paramTime;

    try{
        Class.forName("oracle.jdbc.driver.OracleDriver");
        Connection connCf = DriverManager.getConnection(url, user, pass);

        PreparedStatement pstmtCf=connCf.prepareStatement("insert into screening_tab (film_oid, room_oid, data_hour) values((select ref(fi) from film_tab fi where fi.title=?), (select ref(ro) from room_tab ro where ro.code=?), ?)");

        pstmtCf.setString(1, paramFilm);
        pstmtCf.setString(2, paramRoom);
        String paramDataTime= paramData + " " + paramTime;
        pstmtCf.setString(3, paramDataTime);

        Boolean result= pstmtCf.execute();

how can I solve this problem?

I Have tried this solution in Oracle 10 that given a string from servlet returns timestamp but the problem is the same:

create or replace procedure Sdata (datatime VarCHAR2) is
date_ho TIMESTAMP;
begin
SELECT TO_TIMESTAMP (datatime, 'DD-MON-RR HH.MI.SSXFF AM') into date_ho  FROM DUAL;
dbms_output.enable;
dbms_output.put_line(date_ho);
end sdata;

Between the various attempts and trials, i can not explain how, if I do something like this in Oracle SQL Developer everything works correctly!:

insert into screening_tab (film_oid, room_oid, data_hour) values((select ref(fi) from film_tab fi where fi.title='FilmNumero601'), (select ref(ro) from room_tab ro where ro.code=301), '14-DEC-19 07.00.00.00 PM' );

when I run the exact same query from the servlet I always get the error on the invalid month date

I have tried also this solution: I have created a new Servlet and JSP file where this input for data is:

<h4>Select Data: </h4><br></br>
                                <input type="datetime-local"  name="date" arequired placeholder="Date">
                                <br></br>
                                <input type="reset"  value="Resetta la form"></input>
                                <input type="submit" value="Invia"></input>

In the corresponding servlet i have this:

PreparedStatement pstmtCf=connCf.prepareStatement("insert into screening_tab (film_oid, room_oid, data_hour) values((select ref(fi) from film_tab fi where fi.title=?), (select ref(ro) from room_tab ro where ro.code=?), ?)");



            pstmtCf.setString(1, film);
            pstmtCf.setString(2, room);
            String date= getCorrectFormat(request.getParameter("date")+":00");
            pstmtCf.setString(3, date );


            pstmtCf.execute();



            pstmtCf.close();
            connCf.close();

Where getCorrectFormat() is:

public static String getCorrectFormat(String date){
        String out="";
        out += (date.substring(8,10))+ "-";
        switch(date.substring(5,7)){
        case "01":
            out += "JAN-";
            break;
        case "02":
            out += "FEB-";
            break;
        case "03":
            out += "MAR-";
            break;
        case "04":
            out += "APR-";
            break;
        case "05":
            out += "MAY-";
            break;
        case "06":
            out += "JUN-";
            break;
        case "07":
            out += "JUL-";
            break;
        case "08":
            out += "AUG-";
            break;  
        case "09":
            out += "SEP-";
            break;
        case "10":
            out += "OCT-";
            break;
        case "11":
            out += "NOV-";
            break;
        case "12":
            out += "DEC-";
            break;
        }
        out += (date.substring(0,4))+ " ";
        int hour =Integer.parseInt(date.substring(11,13))%12;
        if(hour == 0)
            out += String.valueOf(12);
        else
            out += String.valueOf(hour);
        out += (date.substring(13));
        if(Integer.parseInt(date.substring(11,13))<12)
            out += " AM";
        else
            out += " PM";
        return out;
    }

The error is always the same: "ORA-01843:not a valid month"

Answer 1

Use objects, not strings.

As of JDBC 4.2, we can directly exchange java.time objects with the database via PreparedStatement::setObject & ResultSet::getObject methods. In your prepared statement, use ? placeholders as seen in Oracle Tutorial .

LocalDate ld = LocalDate.of( 2019 , 8 , 13 ) ;
myPreparedStatement.setObject( … , ld ) ;

And…

LocalTime lt = LocalTime.of( 11 , 0 ) ;
myPreparedStatement.setObject( … , lt ) ;

Retrieval.

LocalDate ld = myResultSet.getObject( … , LocalDate.class ) ;
LocalDate lt = myResultSet.getObject( … , LocalTime.class ) ;

---

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date , Calendar , & SimpleDateFormat .

The Joda-Time project, now in maintenance mode , advises migration to the java.time classes.

To learn more, see the Oracle Tutorial . And search Stack Overflow for many examples and explanations. Specification is JSR 310 .

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.

Where to obtain the java.time classes?

• Java SE 8 , Java SE 9 , Java SE 10 , Java SE 11 , and later - Part of the standard Java API with a bundled implementation.
  • Java 9 adds some minor features and fixes.
• Java SE 6 and Java SE 7
  • Most of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport .
• Android
  • Later versions of Android bundle implementations of the java.time classes.
  • For earlier Android (<26), the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). See How to use ThreeTenABP… .

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval , YearWeek , YearQuarter , and more .

Answer 2

You're passing in a String/varchar2, and the implicit conversion to timestamp is failing because your date/time format doesn't match your Oracle default date/time format.

The easiest option is to pass a format string so Oracle knows how to do the conversion. Instead of passing ? for the timestamp, you could do to_timestamp(?, 'DD-MON-YYYY HH:MI:SS AM')

If you already had a Java Timestamp, I think you'd want to use setTimestamp() - see this question .