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Java 2 Platform SE v1.3.1: Class Timestamp
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java.sql
Class Timestamp

java.lang.Object
  |
  +--java.util.Date
        |
        +--java.sql.Timestamp
All Implemented Interfaces:
Cloneable, Comparable, Serializable
public class Timestamp
extends Date

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 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 nanoseconds 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)
Timestamp(long time)
          Constructs a Timestamp object using a milliseconds time value.
 
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 field to the given value.
 String toString()
          Formats a timestamp in JDBC timestamp escape format.
static Timestamp valueOf(String s)
          Converts a String object 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 Timestamp object initialized with the given values.
Parameters:
year - year-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

Timestamp

public Timestamp(long time)
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.
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 object in JDBC timestamp escape format to a Timestamp value.
Parameters:
s - timestamp in format yyyy-mm-dd hh:mm:ss.fffffffff
Returns:
corresponding Timestamp value
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.
Overrides:
toString in class Date
Returns:
a String object in yyyy-mm-dd hh:mm:ss.fffffffff format

getNanos

public int getNanos()
Gets this Timestamp object's nanos value.
Returns:
this Timestamp object's fractional seconds component

setNanos

public void setNanos(int n)
Sets this Timestamp object's nanos field 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 Timestamp object is equal to the given Timestamp object.
Parameters:
ts - the Timestamp value to compare with

equals

public boolean equals(Object ts)
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.
Overrides:
equals in class Date
Parameters:
ts - the Object value to compare with

before

public boolean before(Timestamp ts)
Indicates whether this Timestamp object is earlier than the given Timestamp object.
Parameters:
ts - the Timestamp value to compare with
Returns:
true if this Timestamp object is earlier; false otherwise

after

public boolean after(Timestamp ts)
Indicates whether this Timestamp object is later than the given Timestamp object.
Parameters:
ts - the Timestamp value to compare with
Returns:
true if this Timestamp object is later; false otherwise
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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