Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class Timestamp - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档
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java.sql
Class Timestamp
java.lang.Object | +--java.util.Date | +--java.sql.Timestamp
- public class Timestamp
- extends Date
This class is a thin wrapper around java.util.Date that allows JDBC to identify this as a SQL TIMESTAMP value. It adds the ability to hold the SQL TIMESTAMP nanos value and provides formatting and parsing operations to support the JDBC escape syntax for timestamp values.
Note: This type is a composite of a java.util.Date and a
separate nanos value. Only integral seconds are stored in the
java.util.Date component. The fractional seconds - the nanos - are
separate. The getTime method will return only integral seconds. If
a time value that includes the fractional seconds is desired, you
must convert nanos to milliseconds (nanos/1000000) and add this to
the getTime value. The
Timestamp.equals(Object) method never returns
true when passed a value of type java.util.Date
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.Data
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.
- See Also:
- Serialized Form
| Constructor Summary | |
Timestamp(int year,
int month,
int date,
int hour,
int minute,
int second,
int nano)
Deprecated. instead use the constructor Timestamp(long millis) |
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Timestamp(long time)
Constructs a Timestamp object
using a milliseconds time value. |
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| Method Summary | |
boolean |
after(Timestamp ts)
Indicates whether this Timestamp object is
later than the given Timestamp object. |
boolean |
before(Timestamp ts)
Indicates whether this Timestamp object is
earlier than the given Timestamp object. |
boolean |
equals(Object ts)
Tests to see if this Timestamp object is
equal to the given object. |
boolean |
equals(Timestamp ts)
Tests to see if this Timestamp object is
equal to the given Timestamp object. |
int |
getNanos()
Gets this Timestamp object's nanos value. |
void |
setNanos(int n)
Sets this Timestamp object's nanos value
to the given value. |
String |
toString()
Formats a timestamp in JDBC timestamp escape format. |
static Timestamp |
valueOf(String s)
Converts a string in JDBC timestamp escape format to a Timestamp value. |
| Methods inherited from class java.util.Date |
after,
before,
clone,
compareTo,
compareTo,
getDate,
getDay,
getHours,
getMinutes,
getMonth,
getSeconds,
getTime,
getTimezoneOffset,
getYear,
hashCode,
parse,
setDate,
setHours,
setMinutes,
setMonth,
setSeconds,
setTime,
setYear,
toGMTString,
toLocaleString,
UTC |
| Methods inherited from class java.lang.Object |
finalize,
getClass,
notify,
notifyAll,
wait,
wait,
wait |
| Constructor Detail |
Timestamp
public Timestamp(int year,
int month,
int date,
int hour,
int minute,
int second,
int nano)
- Deprecated. instead use the constructor
Timestamp(long millis)- Constructs a
Timestampobject initialized with the given values.- Parameters:
year- year-1900month- 0 to 11day- 1 to 31hour- 0 to 23minute- 0 to 59second- 0 to 59nano- 0 to 999,999,999
- Constructs a
Timestamp
public Timestamp(long time)
- Constructs a
Timestampobject using a milliseconds time value. The integral seconds are stored in the underlying date value; the fractional seconds are stored in thenanosfield of theTimestampobject.- Parameters:
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.
| Method Detail |
valueOf
public static Timestamp valueOf(String s)
- Converts a string in JDBC timestamp escape format to a
Timestampvalue.- Parameters:
s- timestamp in formatyyyy-mm-dd hh:mm:ss.fffffffff- Returns:
- corresponding
Timestampvalue - Throws:
- IllegalArgumentException - if the given argument
does not have the format
yyyy-mm-dd hh:mm:ss.fffffffff
toString
public String toString()
- Formats a timestamp in JDBC timestamp escape format.
- Returns:
- a String in
yyyy-mm-dd hh:mm:ss.fffffffffformat
getNanos
public int getNanos()
- Gets this
Timestampobject'snanosvalue.- Returns:
- this
Timestampobject's fractional seconds component
setNanos
public void setNanos(int n)
- Sets this
Timestampobject'snanosvalue to the given value.- Parameters:
n- the new fractional seconds component- Throws:
- IllegalArgumentException - if the given argument is greater than 999999999 or less than 0
equals
public boolean equals(Timestamp ts)
- Tests to see if this
Timestampobject is equal to the givenTimestampobject.- Parameters:
ts- theTimestampvalue to compare with
equals
public boolean equals(Object ts)
- Tests to see if this
Timestampobject is equal to the given object. This version of the methodequalshas been added to fix the incorrect signature ofTimestamp.equals(Timestamp)and preserve backward compatibility with existing class files. Note: This method is not symmetric with respect to theequals(Object)method in the base class.- Parameters:
ts- the Object value to compare with
before
public boolean before(Timestamp ts)
- Indicates whether this
Timestampobject is earlier than the givenTimestampobject.- Parameters:
ts- the Timestamp value to compare with- Returns:
trueif thisTimestampobject is earlier;falseotherwise
after
public boolean after(Timestamp ts)
- Indicates whether this
Timestampobject is later than the givenTimestampobject. Is this timestamp later than the timestamp argument?- Parameters:
ts- the Timestamp value to compare with- Returns:
trueif thisTimestampobject is later;falseotherwise
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