Class java.sql.Timestamp - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.sql.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 only return 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. Also note that the hashcode() method uses the underlying java.util.Data implementation and therefore does not include nanos in its computation.

Timestamp(int, int, int, int, int, int, int): Construct a Timestamp Object
Timestamp(long): Construct a Timestamp using a milliseconds time value.

after(Timestamp): Is this timestamp later than the timestamp argument?
before(Timestamp): Is this timestamp earlier than the timestamp argument?
equals(Timestamp): Test Timestamp values for equality
getNanos(): Get the Timestamp's nanos value
setNanos(int): Set the Timestamp's nanos value
toString(): Format a timestamp in JDBC timestamp escape format
valueOf(String): Convert a string in JDBC timestamp escape format to a Timestamp value

Timestamp

 public Timestamp(int year,
                  int month,
                  int date,
                  int hour,
                  int minute,
                  int second,
                  int nano)

Construct a Timestamp Object

Parameters:: year - year-1900; month - 0 to 11; day - 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)

Construct a Timestamp using a milliseconds time value. The integral seconds are stored in the underlying date value; the fractional seconds are stored in the nanos value.

Parameters:: time - milliseconds since January 1, 1970, 00:00:00 GMT

valueOf

 public static Timestamp valueOf(String s)

Convert a string in JDBC timestamp escape format to a Timestamp value

Parameters:: s - timestamp in format "yyyy-mm-dd hh:mm:ss.fffffffff"
Returns:: corresponding Timestamp

toString

 public String toString()

Format a timestamp in JDBC timestamp escape format

Returns:: a String in yyyy-mm-dd hh:mm:ss.fffffffff format
Overrides:: toString in class Date

getNanos

 public int getNanos()

Get the Timestamp's nanos value

Returns:: the Timestamp's fractional seconds component

setNanos

 public void setNanos(int n)

Set the Timestamp's nanos value

Parameters:: n - the new fractional seconds component

equals

 public boolean equals(Timestamp ts)

Test Timestamp values for equality

Parameters:: ts - the Timestamp value to compare with

before

 public boolean before(Timestamp ts)

Is this timestamp earlier than the timestamp argument?

Parameters:: ts - the Timestamp value to compare with

after

 public boolean after(Timestamp ts)

Is this timestamp later than the timestamp argument?

Parameters:: ts - the Timestamp value to compare with

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