java.lang.Object | ||
↳ | java.util.Date | |
↳ | java.sql.Timestamp |
A thin wrapper around java.util.Date
that allows
the JDBC API to identify this as an SQL TIMESTAMP
value.
It adds the ability
to hold the SQL TIMESTAMP
fractional seconds value, by allowing
the specification of fractional seconds to a precision of nanoseconds.
A Timestamp also provides formatting and
parsing operations to support the JDBC escape syntax for timestamp values.
The precision of a Timestamp object is calculated to be either:
19
, which is the number of characters in yyyy-mm-dd hh:mm:ss
20 + s
, which is the number
of characters in the yyyy-mm-dd hh:mm:ss.[fff...] and s
represents the scale of the given Timestamp,
its fractional seconds precision.
Note: This type is a composite of a java.util.Date
and a
separate nanoseconds value. Only integral seconds are stored in the
java.util.Date
component. The fractional seconds - the nanos - are
separate. The Timestamp.equals(Object)
method never returns
true
when passed an object
that isn't an instance of java.sql.Timestamp
,
because the nanos component of a date is unknown.
As a result, the Timestamp.equals(Object)
method is not symmetric with respect to the
java.util.Date.equals(Object)
method. Also, the hashcode
method uses the underlying
java.util.Date
implementation and therefore does not include nanos in its computation.
Due to the differences between the Timestamp
class
and the java.util.Date
class mentioned above, it is recommended that code not view
Timestamp
values generically as an instance of
java.util.Date
. The
inheritance relationship between Timestamp
and java.util.Date
really
denotes implementation inheritance, and not type inheritance.
Public Constructors | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
This constructor is deprecated.
instead use the constructor
Timestamp(long millis) | |||||||||||
Constructs a
Timestamp object
using a milliseconds time value. |
Public Methods | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Indicates whether this
Timestamp object is
later than the given Timestamp object. | |||||||||||
Indicates whether this
Timestamp object is
earlier than the given Timestamp object. | |||||||||||
Compares this
Timestamp object to the given
Date , which must be a Timestamp
object. | |||||||||||
Compares this
Timestamp object to the given
Timestamp object. | |||||||||||
Tests to see if this
Timestamp object is
equal to the given Timestamp object. | |||||||||||
Tests to see if this
Timestamp object is
equal to the given object. | |||||||||||
Gets this
Timestamp object's nanos value. | |||||||||||
Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT
represented by this
Timestamp object. | |||||||||||
Sets this
Timestamp object's nanos field
to the given value. | |||||||||||
Sets this
Timestamp object to represent a point in time that is
time milliseconds after January 1, 1970 00:00:00 GMT. | |||||||||||
Formats a timestamp in JDBC timestamp escape format.
| |||||||||||
Converts a
String object in JDBC timestamp escape format to a
Timestamp value. |
[Expand]
Inherited Methods | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
From class
java.util.Date
| |||||||||||
From class
java.lang.Object
| |||||||||||
From interface
java.lang.Comparable
|
This constructor is deprecated.
instead use the constructor Timestamp(long millis)
Constructs a Timestamp
object initialized
with the given values.
year | the year minus 1900 |
---|---|
month | 0 to 11 |
date | 1 to 31 |
hour | 0 to 23 |
minute | 0 to 59 |
second | 0 to 59 |
nano | 0 to 999,999,999 |
IllegalArgumentException | if the nano argument is out of bounds |
---|
Constructs a Timestamp
object
using a milliseconds time value. The
integral seconds are stored in the underlying date value; the
fractional seconds are stored in the nanos
field of
the Timestamp
object.
time | milliseconds since January 1, 1970, 00:00:00 GMT. A negative number is the number of milliseconds before January 1, 1970, 00:00:00 GMT. |
---|
Indicates whether this Timestamp
object is
later than the given Timestamp
object.
ts | the Timestamp value to compare with |
---|
true
if this Timestamp
object is later;
false
otherwise
Indicates whether this Timestamp
object is
earlier than the given Timestamp
object.
ts | the Timestamp value to compare with |
---|
true
if this Timestamp
object is earlier;
false
otherwise
Compares this Timestamp
object to the given
Date
, which must be a Timestamp
object. If the argument is not a Timestamp
object,
this method throws a ClassCastException
object.
(Timestamp
objects are
comparable only to other Timestamp
objects.)
o | the Date to be compared, which must be a
Timestamp object |
---|
0
if this Timestamp
object
and the given object are equal; a value less than 0
if this Timestamp
object is before the given argument;
and a value greater than 0
if this
Timestamp
object is after the given argument.Compares this Timestamp
object to the given
Timestamp
object.
ts | the Timestamp object to be compared to
this Timestamp object |
---|
0
if the two Timestamp
objects are equal; a value less than 0
if this
Timestamp
object is before the given argument;
and a value greater than 0
if this
Timestamp
object is after the given argument.Tests to see if this Timestamp
object is
equal to the given Timestamp
object.
ts | the Timestamp value to compare with |
---|
true
if the given Timestamp
object is equal to this Timestamp
object;
false
otherwise
Tests to see if this Timestamp
object is
equal to the given object.
This version of the method equals
has been added
to fix the incorrect
signature of Timestamp.equals(Timestamp)
and to preserve backward
compatibility with existing class files.
Note: This method is not symmetric with respect to the
equals(Object)
method in the base class.
ts | the Object value to compare with |
---|
true
if the given Object
is an instance
of a Timestamp
that
is equal to this Timestamp
object;
false
otherwise
Gets this Timestamp
object's nanos
value.
Timestamp
object's fractional seconds componentReturns the number of milliseconds since January 1, 1970, 00:00:00 GMT
represented by this Timestamp
object.
Sets this Timestamp
object's nanos
field
to the given value.
n | the new fractional seconds component |
---|
IllegalArgumentException | if the given argument is greater than 999999999 or less than 0 |
---|
Sets this Timestamp
object to represent a point in time that is
time milliseconds after January 1, 1970 00:00:00 GMT.
time | the number of milliseconds. |
---|
Formats a timestamp in JDBC timestamp escape format.
yyyy-mm-dd hh:mm:ss.fffffffff
,
where ffffffffff
indicates nanoseconds.
String
object in
yyyy-mm-dd hh:mm:ss.fffffffff
format
Converts a String
object in JDBC timestamp escape format to a
Timestamp
value.
s | timestamp in format yyyy-mm-dd hh:mm:ss[.f...] . The
fractional seconds may be omitted. |
---|
Timestamp
valueIllegalArgumentException | if the given argument
does not have the format yyyy-mm-dd hh:mm:ss[.f...]
|
---|