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提交 bd628341 authored 作者: Evgenij Ryazanov's avatar Evgenij Ryazanov
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Reimplement date-time variant of TO_CHAR without a Calendar

上级 22ed525f
隐藏空白字符变更
内嵌 并排
正在显示 包含 91 行增加 和 68 行删除
h2/src/main/org/h2/expression/Function.java
浏览文件 @ bd628341
......@@ -1449,7 +1449,8 @@ public class Function extends Expression implements FunctionCall {
case Value.TIME:
case Value.DATE:
case Value.TIMESTAMP:
result = ValueString.get(ToChar.toChar(v0.getTimestamp(),
case Value.TIMESTAMP_TZ:
result = ValueString.get(ToChar.toCharDateTime(v0,
v1 == null ? null : v1.getString(),
v2 == null ? null : v2.getString()),
database.getMode().treatEmptyStringsAsNull);
......
h2/src/main/org/h2/util/ToChar.java
浏览文件 @ bd628341
......@@ -6,20 +6,18 @@
package org.h2.util;
import java.math.BigDecimal;
import java.sql.Date;
import java.sql.Timestamp;
import java.text.DateFormatSymbols;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Currency;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;
import org.h2.api.ErrorCode;
import org.h2.message.DbException;
import org.h2.value.Value;
/**
* Emulates Oracle's TO_CHAR function.
......@@ -29,7 +27,7 @@ public class ToChar {
/**
* The beginning of the Julian calendar.
*/
private static final long JULIAN_EPOCH;
private static final int JULIAN_EPOCH = -2_440_588;
private static final int[] ROMAN_VALUES = { 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9,
5, 4, 1 };
......@@ -37,15 +35,6 @@ public class ToChar {
private static final String[] ROMAN_NUMERALS = { "M", "CM", "D", "CD", "C", "XC",
"L", "XL", "X", "IX", "V", "IV", "I" };
static {
GregorianCalendar epoch = new GregorianCalendar(Locale.ENGLISH);
epoch.setGregorianChange(new Date(Long.MAX_VALUE));
epoch.clear();
epoch.set(4713, Calendar.JANUARY, 1, 0, 0, 0);
epoch.set(Calendar.ERA, GregorianCalendar.BC);
JULIAN_EPOCH = epoch.getTimeInMillis();
}
private ToChar() {
// utility class
}
......@@ -592,22 +581,35 @@ public class ToChar {
* See also TO_CHAR(datetime) and datetime format models
* in the Oracle documentation.
*
* @param ts the timestamp to format
* @param value the date-time value to format
* @param format the format pattern to use (if any)
* @param nlsParam the NLS parameter (if any)
* @return the formatted timestamp
*/
public static String toChar(Timestamp ts, String format, @SuppressWarnings("unused") String nlsParam) {
public static String toCharDateTime(Value value, String format, @SuppressWarnings("unused") String nlsParam) {
long[] a = DateTimeUtils.dateAndTimeFromValue(value);
long dateValue = a[0];
long timeNanos = a[1];
int year = DateTimeUtils.yearFromDateValue(dateValue);
int monthOfYear = DateTimeUtils.monthFromDateValue(dateValue);
int dayOfMonth = DateTimeUtils.dayFromDateValue(dateValue);
long second = timeNanos / 1_000_000_000;
int nanos = (int) (timeNanos - second * 1_000_000_000);
int minute = (int) (second / 60);
second -= minute * 60;
int hour = minute / 60;
minute -= hour * 60;
int h12 = (hour + 11) % 12 + 1;
boolean isAM = hour < 12;
if (format == null) {
format = "DD-MON-YY HH.MI.SS.FF PM";
}
GregorianCalendar cal = new GregorianCalendar(Locale.ENGLISH);
cal.setTimeInMillis(ts.getTime());
StringBuilder output = new StringBuilder();
boolean fillMode = true;
DateFormatSymbols dfs = null;
for (int i = 0; i < format.length();) {
Capitalization cap;
......@@ -615,94 +617,114 @@ public class ToChar {
// AD / BC
if ((cap = containsAt(format, i, "A.D.", "B.C.")) != null) {
String era = cal.get(Calendar.ERA) == GregorianCalendar.AD ? "A.D." : "B.C.";
String era = year > 0 ? "A.D." : "B.C.";
output.append(cap.apply(era));
i += 4;
} else if ((cap = containsAt(format, i, "AD", "BC")) != null) {
String era = cal.get(Calendar.ERA) == GregorianCalendar.AD ? "AD" : "BC";
String era = year > 0 ? "AD" : "BC";
output.append(cap.apply(era));
i += 2;
// AM / PM
} else if ((cap = containsAt(format, i, "A.M.", "P.M.")) != null) {
String am = cal.get(Calendar.AM_PM) == Calendar.AM ? "A.M." : "P.M.";
String am = isAM ? "A.M." : "P.M.";
output.append(cap.apply(am));
i += 4;
} else if ((cap = containsAt(format, i, "AM", "PM")) != null) {
String am = cal.get(Calendar.AM_PM) == Calendar.AM ? "AM" : "PM";
String am = isAM ? "AM" : "PM";
output.append(cap.apply(am));
i += 2;
// Long/short date/time format
} else if ((cap = containsAt(format, i, "DL")) != null) {
output.append(new SimpleDateFormat("EEEE, MMMM d, yyyy").format(ts));
if (dfs == null) {
dfs = DateFormatSymbols.getInstance();
}
String day = dfs.getWeekdays()[DateTimeUtils.getSundayDayOfWeek(dateValue)];
String month = dfs.getMonths()[monthOfYear - 1];
output.append(day).append(", ").append(month).append(' ').append(dayOfMonth).append(", ");
StringUtils.appendZeroPadded(output, 4, Math.abs(year));
i += 2;
} else if ((cap = containsAt(format, i, "DS")) != null) {
output.append(new SimpleDateFormat("MM/dd/yyyy").format(ts));
StringUtils.appendZeroPadded(output, 2, monthOfYear);
output.append('/');
StringUtils.appendZeroPadded(output, 2, dayOfMonth);
output.append('/');
StringUtils.appendZeroPadded(output, 4, Math.abs(year));
i += 2;
} else if ((cap = containsAt(format, i, "TS")) != null) {
output.append(new SimpleDateFormat("h:mm:ss aa").format(ts));
if (dfs == null) {
dfs = DateFormatSymbols.getInstance();
}
output.append(h12).append(':');
StringUtils.appendZeroPadded(output, 2, minute);
output.append(':');
StringUtils.appendZeroPadded(output, 2, second);
output.append(' ');
output.append(dfs.getAmPmStrings()[isAM ? 0 : 1]);
i += 2;
// Day
} else if ((cap = containsAt(format, i, "DDD")) != null) {
output.append(cal.get(Calendar.DAY_OF_YEAR));
output.append(DateTimeUtils.getDayOfYear(dateValue));
i += 3;
} else if ((cap = containsAt(format, i, "DD")) != null) {
output.append(String.format("%02d",
cal.get(Calendar.DAY_OF_MONTH)));
dayOfMonth));
i += 2;
} else if ((cap = containsAt(format, i, "DY")) != null) {
String day = new SimpleDateFormat("EEE").format(ts);
if (dfs == null) {
dfs = DateFormatSymbols.getInstance();
}
String day = dfs.getShortWeekdays()[DateTimeUtils.getSundayDayOfWeek(dateValue)];
output.append(cap.apply(day));
i += 2;
} else if ((cap = containsAt(format, i, "DAY")) != null) {
String day = new SimpleDateFormat("EEEE").format(ts);
if (dfs == null) {
dfs = DateFormatSymbols.getInstance();
}
String day = dfs.getWeekdays()[DateTimeUtils.getSundayDayOfWeek(dateValue)];
if (fillMode) {
day = StringUtils.pad(day, "Wednesday".length(), " ", true);
}
output.append(cap.apply(day));
i += 3;
} else if ((cap = containsAt(format, i, "D")) != null) {
output.append(cal.get(Calendar.DAY_OF_WEEK));
output.append(DateTimeUtils.getSundayDayOfWeek(dateValue));
i += 1;
} else if ((cap = containsAt(format, i, "J")) != null) {
long millis = ts.getTime() - JULIAN_EPOCH;
long days = (long) Math.floor(millis / (1000 * 60 * 60 * 24));
output.append(days);
output.append(DateTimeUtils.absoluteDayFromDateValue(dateValue) - JULIAN_EPOCH);
i += 1;
// Hours
} else if ((cap = containsAt(format, i, "HH24")) != null) {
output.append(new DecimalFormat("00").format(cal.get(Calendar.HOUR_OF_DAY)));
StringUtils.appendZeroPadded(output, 2, hour);
i += 4;
} else if ((cap = containsAt(format, i, "HH12")) != null) {
output.append(new DecimalFormat("00").format(cal.get(Calendar.HOUR)));
StringUtils.appendZeroPadded(output, 2, h12);
i += 4;
} else if ((cap = containsAt(format, i, "HH")) != null) {
output.append(new DecimalFormat("00").format(cal.get(Calendar.HOUR)));
StringUtils.appendZeroPadded(output, 2, h12);
i += 2;
// Minutes
} else if ((cap = containsAt(format, i, "MI")) != null) {
output.append(new DecimalFormat("00").format(cal.get(Calendar.MINUTE)));
StringUtils.appendZeroPadded(output, 2, minute);
i += 2;
// Seconds
} else if ((cap = containsAt(format, i, "SSSSS")) != null) {
int seconds = cal.get(Calendar.HOUR_OF_DAY) * 60 * 60;
seconds += cal.get(Calendar.MINUTE) * 60;
seconds += cal.get(Calendar.SECOND);
int seconds = (int) (timeNanos / 1_000_000_000);
output.append(seconds);
i += 5;
} else if ((cap = containsAt(format, i, "SS")) != null) {
output.append(new DecimalFormat("00").format(cal.get(Calendar.SECOND)));
StringUtils.appendZeroPadded(output, 2, second);
i += 2;
// Fractional seconds
......@@ -710,11 +732,11 @@ public class ToChar {
} else if ((cap = containsAt(format, i, "FF1", "FF2",
"FF3", "FF4", "FF5", "FF6", "FF7", "FF8", "FF9")) != null) {
int x = Integer.parseInt(format.substring(i + 2, i + 3));
int ff = (int) (cal.get(Calendar.MILLISECOND) * Math.pow(10, x - 3));
int ff = (int) (nanos * Math.pow(10, x - 9));
output.append(ff);
i += 3;
} else if ((cap = containsAt(format, i, "FF")) != null) {
output.append(cal.get(Calendar.MILLISECOND) * 1000);
output.append(nanos / 1_000);
i += 2;
// Time zone
......@@ -732,59 +754,67 @@ public class ToChar {
// Week
} else if ((cap = containsAt(format, i, "IW", "WW")) != null) {
output.append(cal.get(Calendar.WEEK_OF_YEAR));
output.append(DateTimeUtils.getWeekOfYear(dateValue, 0, 1));
i += 2;
} else if ((cap = containsAt(format, i, "W")) != null) {
int w = (int) (1 + Math.floor(cal.get(Calendar.DAY_OF_MONTH) / 7));
int w = 1 + dayOfMonth / 7;
output.append(w);
i += 1;
// Year
} else if ((cap = containsAt(format, i, "Y,YYY")) != null) {
output.append(new DecimalFormat("#,###").format(getYear(cal)));
output.append(new DecimalFormat("#,###").format(Math.abs(year)));
i += 5;
} else if ((cap = containsAt(format, i, "SYYYY")) != null) {
if (cal.get(Calendar.ERA) == GregorianCalendar.BC) {
if (year <= 0) {
output.append('-');
}
output.append(new DecimalFormat("0000").format(getYear(cal)));
StringUtils.appendZeroPadded(output, 4, Math.abs(year));
i += 5;
} else if ((cap = containsAt(format, i, "YYYY", "IYYY", "RRRR")) != null) {
output.append(new DecimalFormat("0000").format(getYear(cal)));
StringUtils.appendZeroPadded(output, 4, Math.abs(year));
i += 4;
} else if ((cap = containsAt(format, i, "YYY", "IYY")) != null) {
output.append(new DecimalFormat("000").format(getYear(cal) % 1000));
StringUtils.appendZeroPadded(output, 3, Math.abs(year) % 1000);
i += 3;
} else if ((cap = containsAt(format, i, "YY", "IY", "RR")) != null) {
output.append(new DecimalFormat("00").format(getYear(cal) % 100));
StringUtils.appendZeroPadded(output, 2, Math.abs(year) % 100);
i += 2;
} else if ((cap = containsAt(format, i, "I", "Y")) != null) {
output.append(getYear(cal) % 10);
output.append(Math.abs(year) % 10);
i += 1;
// Month / quarter
} else if ((cap = containsAt(format, i, "MONTH")) != null) {
String month = new SimpleDateFormat("MMMM").format(ts);
if (dfs == null) {
dfs = DateFormatSymbols.getInstance();
}
String month = dfs.getMonths()[monthOfYear - 1];
if (fillMode) {
month = StringUtils.pad(month, "September".length(), " ", true);
}
output.append(cap.apply(month));
i += 5;
} else if ((cap = containsAt(format, i, "MON")) != null) {
String month = new SimpleDateFormat("MMM").format(ts);
if (dfs == null) {
dfs = DateFormatSymbols.getInstance();
}
String month = dfs.getShortMonths()[monthOfYear - 1];
if (month.endsWith(".")) {
month = month.substring(0, month.length() - 1);
}
output.append(cap.apply(month));
i += 3;
} else if ((cap = containsAt(format, i, "MM")) != null) {
output.append(String.format("%02d", cal.get(Calendar.MONTH) + 1));
StringUtils.appendZeroPadded(output, 2, monthOfYear);
i += 2;
} else if ((cap = containsAt(format, i, "RM")) != null) {
int month = cal.get(Calendar.MONTH) + 1;
output.append(cap.apply(toRomanNumeral(month)));
output.append(cap.apply(toRomanNumeral(monthOfYear)));
i += 2;
} else if ((cap = containsAt(format, i, "Q")) != null) {
int q = (int) (1 + Math.floor(cal.get(Calendar.MONTH) / 3));
int q = 1 + ((monthOfYear - 1) / 3);
output.append(q);
i += 1;
......@@ -835,14 +865,6 @@ public class ToChar {
return output.toString();
}
private static int getYear(Calendar cal) {
int year = cal.get(Calendar.YEAR);
if (cal.get(Calendar.ERA) == GregorianCalendar.BC) {
year--;
}
return year;
}
/**
* Returns a capitalization strategy if the specified string contains any of
* the specified substrings at the specified index. The capitalization
......
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