程序包 com.mysql.cj.util

类 TimeUtil

java.lang.Object

com.mysql.cj.util.TimeUtil

public class TimeUtil
extends Object

Timezone conversion routines and other time related methods

字段概要

字段

修饰符和类型	字段	说明
protected static Method	systemNanoTimeMethod

构造器概要

构造器

构造器	说明
TimeUtil()

方法概要

修饰符和类型	方法	说明
static Timestamp	adjustTimestampNanosPrecision(Timestamp ts, int fsp, boolean serverRoundFracSecs)	Return a new Timestamp object which value is adjusted according to known DATE, DATETIME or TIMESTAMP field precision.
static String	formatNanos(int nanos, int fsp)	Return a string representation of a fractional seconds part.
static String	formatNanos(int nanos, int fsp, boolean truncateTrailingZeros)	Return a string representation of a fractional seconds part.
static String	getCanonicalTimezone(String timezoneStr, ExceptionInterceptor exceptionInterceptor)	Returns the 'official' Java timezone name for the given timezone
static long	getCurrentTimeNanosOrMillis()
static String	getDateTimePattern(String dt, boolean toTime)	Used in prepared statements
static SimpleDateFormat	getSimpleDateFormat(SimpleDateFormat cachedSimpleDateFormat, String pattern, Calendar cal, TimeZone tz)
static boolean	nanoTimeAvailable()
static Timestamp	truncateFractionalSeconds(Timestamp timestamp)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

systemNanoTimeMethod

protected static final Method systemNanoTimeMethod

构造器详细资料

TimeUtil

public TimeUtil()

方法详细资料

nanoTimeAvailable

public static boolean nanoTimeAvailable()

getCurrentTimeNanosOrMillis

public static long getCurrentTimeNanosOrMillis()

getCanonicalTimezone

public static String getCanonicalTimezone(String timezoneStr,
                                          ExceptionInterceptor exceptionInterceptor)

Returns the 'official' Java timezone name for the given timezone

参数:

timezoneStr - the 'common' timezone name

exceptionInterceptor - exception interceptor

返回:

the Java timezone name for the given timezone

adjustTimestampNanosPrecision

public static Timestamp adjustTimestampNanosPrecision(Timestamp ts,
                                                      int fsp,
                                                      boolean serverRoundFracSecs)

Return a new Timestamp object which value is adjusted according to known DATE, DATETIME or TIMESTAMP field precision.

参数:

ts - an original Timestamp object, not modified by this method

fsp - value in the range from 0 to 6 specifying fractional seconds precision

serverRoundFracSecs - Flag indicating whether rounding or truncation occurs on server when inserting a TIME, DATE, or TIMESTAMP value with a fractional seconds part into a column having the same type but fewer fractional digits: true means rounding, false means truncation. The proper value should be detected by analyzing sql_mode server variable for TIME_TRUNCATE_FRACTIONAL presence.

返回:

A new Timestamp object cloned from original ones and then rounded or truncated according to required fsp value

formatNanos

public static String formatNanos(int nanos,
                                 int fsp)

Return a string representation of a fractional seconds part. This method assumes that all Timestamp adjustments are already done before, thus no rounding is needed, only a proper "0" padding to be done.

参数:

nanos - fractional seconds value

fsp - required fractional part length

返回:

fractional seconds part as a string

formatNanos

public static String formatNanos(int nanos,
                                 int fsp,
                                 boolean truncateTrailingZeros)

Return a string representation of a fractional seconds part. This method assumes that all Timestamp adjustments are already done before, thus no rounding is needed, only a proper "0" padding to be done.

参数:

nanos - fractional seconds value

fsp - required fractional part length

truncateTrailingZeros - whether to remove trailing zero characters in a fractional part after formatting

返回:

fractional seconds part as a string

truncateFractionalSeconds

public static Timestamp truncateFractionalSeconds(Timestamp timestamp)

getSimpleDateFormat

public static SimpleDateFormat getSimpleDateFormat(SimpleDateFormat cachedSimpleDateFormat,
                                                   String pattern,
                                                   Calendar cal,
                                                   TimeZone tz)

getDateTimePattern

public static final String getDateTimePattern(String dt,
                                              boolean toTime)
                                       throws IOException

Used in prepared statements

参数:

dt - DateTime string

toTime - true if get Time pattern

返回:

pattern

抛出:

IOException - if an error occurs