I'm new to Java and also to Postgres.
I have a little project about restaurant and i have a struk(eng: bill) table like this:
and I have a method to inserting information into that table like this:
public int insertBill(int id_karyawan, String tanggal, String waktu, int total) {
String SQL = "INSERT INTO struk(kode, id_karyawan, tanggal, waktu, total) VALUES (?,?,?,?,?)";
int id = 0;
try(Connection conn = connect(); PreparedStatement pstmt = conn.prepareStatement(SQL, Statement.RETURN_GENERATED_KEYS)) {
pstmt.setInt(1, 1);
pstmt.setInt(2, id_karyawan);
pstmt.setString(3, tanggal);
pstmt.setString(4, waktu);
pstmt.setInt(5, total);
int affectedRows = pstmt.executeUpdate();
if(affectedRows > 0) {
try(ResultSet rs = pstmt.getGeneratedKeys()) {
if(rs.next()) {
id = rs.getInt(1);
}
} catch (SQLException ex) {
System.out.println(ex.getMessage());
}
}
} catch (SQLException ex) {
System.out.println(ex.getMessage());
}
return id;
}
later, that method will called with this:
int billID = app.insertBill(1, "2017-09-24", "08:00:00", 150000);
The problem is, i dont have any idea about the Date and the time, what should i pass as a parameter? what kind of variable so that the query work well? I've searched about it got some clue to use string. I use string on a query method for now. Any advice?
Since you have said you are new to java, I assume that you would be using Java 8 and The PostgreSQL JDBC driver provides native support for the Java 8 Date and Time API using JDBC 4.2.
Following datatypes for Date/Time are supported by PostgreSQL :
DATE
TIME [ WITHOUT TIMEZONE ]
TIMESTAMP [ WITHOUT TIMEZONE ]
TIMESTAMP WITH TIMEZONE
You can use the LocalDate, LocalTime, LocalDateTime or OffsetDateTime (OffsetDateTime is an immutable representation of a date-time with an offset eg:the value "20th July 2017 at 10:45.24.123456789 +04:00" can be stored in an OffsetDateTime). These classes comes in the java.time package, which was introduced in Java 8, as a new Date-Time API.(It covers several cons of old date-time API like design issues, thread safety, time zone handling issues etc.) However, ZonedDateTime, Instant and OffsetTime / TIME [ WITHOUT TIMEZONE ] are currently not supported in PostgreSQl (as in JDBC 4.2). Now comming to programming part based on you code, you can do it like this.
public int insertBill(int id_karyawan, String tanggal, String waktu, int total) {
LocalDate localDate = LocalDate.now(); //or whatever date you want to use, for passing parameter as string you could use
/*public static LocalDate parse(CharSequence text,
DateTimeFormatter formatter)*/
// LocalDate ld = LocalDate.of(2017, Month.JULY, 20);
LocalTime lt = LocalTime.of(8, 0, 0);
String SQL = "INSERT INTO struk(kode, id_karyawan, tanggal, waktu, total) VALUES (?,?,?,?,?)";
int id = 0;
try(Connection conn = connect(); PreparedStatement pstmt = conn.prepareStatement(SQL, Statement.RETURN_GENERATED_KEYS)) {
pstmt.setInt(1, 1);
pstmt.setInt(2, id_karyawan);
pstmt.setObject(3, localDate);
pstmt.setObject(4, lt);
pstmt.setInt(5, total);
pstmt.executeUpdate();
pstmt.close();
Hope this helped you. In case you are using Java versions below 8, you could use joda time.
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