Calculation Based on Previous Day's Figure
Hi all,
This is a solution I implemented several years ago, which is now causing problems and must be rectified. The intention was to compare a single field across two days and calculate the difference. The only way I could figure out how to do that
back then was to go back and loop through the whole table, calculating the difference each day until the present day. This obviously isn't very efficient and now something has gone wrong.
Here's the code:
// Calculates Nett Oil Volume Increase
double previousNettOilVolA = 82433; // value on 2/1/13 which is the live value on the day before this system begins
double previousNettOilVolB = 51347; // value on 2/1/13 which is the live value on the day before this system begins
foreach (DailyTankData tankdata in DataWorkspace.ApplicationData.DailyTankDatas)
if (tankdata.NettOilVolume15TankA != null)//otherwise will crash if null value
tankdata.NettOilVolumeIncreaseTankA = (double)tankdata.NettOilVolume15TankA - previousNettOilVolA;
previousNettOilVolA = (double)tankdata.NettOilVolume15TankA;
tankdata.NettOilVolumeIncreaseTankB = (double)tankdata.NettOilVolume15TankB - previousNettOilVolB;
previousNettOilVolB = (double)tankdata.NettOilVolume15TankB;
This is run on the _Compute event of another property in the table. It seemed to work for a long time, but now is occasionally giving wildly inaccurate numbers.
What's a better way to solve this problem? Failing that, can anyone explain exactly how the above works and why it might be going wrong?
Thanks,
Liam
Start by looking at your data. Any unusual spikes or negative values?
A better way to handle it is to let the database do the calculations via a stored procedure.
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Kindly help me, as i want to keep it customized so that without specifying the hard coded dates ( Previous Day) it runs through and provide me the resultset....
All of your help and time is highly appericated.You mean business days I guess ?
I use a function (I had to write it myself) <tt><b> next_business_day(p_start_date in date,p_days_count in number) return date </b></tt>
where I loop forward/backward from p_start_date according to the sign of p_days_count the required number of steps skipping weekends and holidays as the absolute value of p_days_count is mostly under 30 for the rest (at least around here) Oracle's <tt><b> add_months </b></tt> gets it done.
Regards
Etbin
Edited by: Etbin on 6.8.2012 17:55
Year till date: <tt><b> your_date between trunc(sysdate,'year') and sysdate </b></tt> is it ? http://en.wikipedia.org/wiki/Year-to-date ?
Edited by: Etbin on 6.8.2012 18:27
NOT TESTED!
function next_business_date(p_start_date in date,p_count_days in number) return date is
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Hello,
I've been working for months on the stock valuation at month end closing for the Finance department. We discover a situation where the moving average price is not calculated as we expected.
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Thank you in advance
RegardsArti,
MBEWH table will get you the MAP of a material monthwise,I guess you need to get the logic which will use those details to arrive on MAP for a paritcular date.
Check the SDN Forums with the keyword "MOVING AVERAGE PRICE REPORT" to get some lead.
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if (this.getDay() >= 0
&& this.getDay() <= 31
&& this.getMonth() >= 0
&& this.getMonth() <= 12) {
return true;
else {
return false;
/** Calculates the age of a person given the date
* @return The age of the person
* Test Cases:
* this.Dates(12, 10, 1990), dateMarked.Dates(12, 10, 0) = 1990
* this.Dates( 4, 25, 1000), dateMarked.Dates(12, 10, -990) = 1990
* this.Dates( 1, 1, 2578), dateMarked.Dates(12, 10, 1989) = 589
int calculateAge( Date birthday ) {
return (this.getYear() - birthday.getYear());
/** Do two dates represent the exact same day?
* @param other The date to compare this Date against.
* @return true if (and only if) this Date represents the same day as other.
* (that is, the same year, month, day-of-month).
* Test Cases:
* this.Dates(12, 10, 1989), other.Dates(12, 10, 1989) = true
* this.Dates(12, 10, 1989), other.Dates(11, 10, 1989) = false
* this.Dates(12, 10, 1989), other.Dates(12, 9, 1989) = false
* this.Dates(12, 10, 1989), other.Dates(12, 10, 1988) = false
boolean isEqualTo( Date otherDate ) {
if (this.getDay() == otherDate.getDay()
&& this.getMonth() == otherDate.getMonth()
&& this.getYear() == otherDate.getYear()) {
return true;
else {
return false;
/** Does one Date precede another?
* @param other The date to compare this Date against.
* @return true if (and only if) this Date comes before other.
* this.Dates( 5, 5, 2000), other.Dates( 5, 6, 2000) = true
* this.Dates( 5, 5, 2000), other.Dates( 6, 5, 2000) = true
* this.Dates( 5, 5, 2000), other.Dates( 5, 5, 2001) = true
* this.Dates( 5, 5, 2000), other.Dates( 5, 4, 2000) = false
* this.Dates( 5, 5, 2000), other.Dates( 5, 5, 1999) = false
* this.Dates( 5, 5, 2000), other.Dates( 4, 5, 2000) = false
boolean isBefore( Date otherDate ) {
if (this.getYear() <= otherDate.getYear()
&& this.getMonth() <= otherDate.getMonth()
&& this.getDay() < otherDate.getDay()) {
return true;
else if (this.getYear() <= otherDate.getYear()
&& this.getMonth() < otherDate.getMonth()) {
return true;
else if (this.getYear() < otherDate.getYear()) {
return true;
else {
return false;
/** Determines how many days there are in the month, given the instance's specified month and year
* @Return returns the number of days in the month
int daysInTheMonth () {
if (this.isValid() == true) {
if (this.getMonth() == 2) {
if (this.isLeapYear() == true) {
return 29;
else {
return 28;
else if (this.getMonth() == 1
|| this.getMonth() == 3
|| this.getMonth() == 5
|| this.getMonth() == 7
|| this.getMonth() == 8
|| this.getMonth() == 10
|| this.getMonth() == 12) {
return 31;
else {
return 30;
else {
return 0;
/** Return the day after `this`. (`this` must be a valid date.)
* @return the day after `this`. The result will be valid if `this` is valid.
Date nextDay() {
if (this.getDay() == this.getDaysInTheMonth() && this.getMonth() == 12) {
return new Date(1, 1, this.getYear() + 1);
else if (this.getDay() == this.getDaysInTheMonth()) {
return new Date(this.getMonth() + 1, 1, this.getYear());
else {
return new Date(this.getMonth(), this.getDay() + 1, this.getYear());
/** Return the day before `this`. (`this` must be a valid date.)
* @return the day before `this`. The result will be valid if `this` is valid.
Date previousDay() {
if (this.getDay() == 1 && this.getMonth() == 1) {
return new Date(12, this.getDaysInTheMonth(), this.getYear() - 1);
//Need to fix the days in the previous month and previous month
else if (this.getDay() == 1) {
return new Date(this.getMonth() - 1, this.getDaysInTheMonth() - 1,
this.getYear()); //need to fix the days in the previous month
else {
return new Date(this.getMonth() - 1, this.getDaysInTheMonth(), this.getYear());
/** Returns a true or false depending on whether the year is a leap year or not
* @return a true or false depending on whether the year is a leap year or not
* Test Cases:
* this.Dates( 5, 5, 2000) = true
* this.Dates(12, 6, 2004) = true
* this.Dates( 1, 1, 2001) = false
* this.Dates( 7, 9, 2006) = false
boolean isLeapYear () {
if (this.getYear() % 400 == 0) {
return true;
else if (this.getYear() % 100 == 0) {
return false;
else if (this.getYear() % 4 ==0) {
return true;
else {
return false;
null
Edited by: THE_Russian on Sep 28, 2007 4:35 PMYeahhhh... that's exactly what I was trying not to do, I know that method, I don't want any associations with the Calendar class, thanks though
Aw crap, you can't edit the original post? Sorry everyone for the unformatted code, here's the formatted version
* Date calculates the date and gives other information requested such as the birthday of someone, the
* previous and next days, whether the date is valid or not, and whether the year is a leap year
* @author Vlad Khmarsky
* @version 1.1
public class Date
/** The month */
int month = 00;
/** The day */
int day = 00;
/** The year */
int year = 0000;
/** First month of the year */
int firstMonthInYear = 1;
/** Last month of the year */
int lastMonthInYear = 12;
/** First day of the month */
int firstDayInMonth = 1;
/** Asks for the day, month, and year upon creting an instance of dates
* @day asks for the day
* @month asks for the month
* @year asks for the year
Date( int month_, int day_, int year_) {
this.month = month_;
this.day = day_;
this.year = year_;
/** Gets the month passed in initially
* @return The month that is currently stored in the month field
int getMonth() {
return this.month;
/** Gets the day passed in initially
* @return The day that is currently stored in the month field
int getDay() {
return this.day;
/** Gets the year passed in initially
* @return The year that is currently stored in the month field
int getYear() {
return this.year;
/** Gets the number of days in the given month
* @return the number of days in the given month
int getDaysInTheMonth() {
return this.daysInTheMonth();
/** Returns the date in Gregorian format
* @return Returns the date in Gregorian format
* Test Cases:
* this.Dates(12, 10, 1989) = "12/10/1989"
* this.Dates(54, 67, 9999) = "54/67/9999"
* this.Dates(-1, -9, -900) = "-1/-9/-900"
String toPrettyString() {
return month + "/" + day + "/" + year;
/** Checks whether the passed in date is valid or not
* @return A true or false whether the date is valid
* Test Cases:
* this.Dates(12, 10, 1989) = true
* this.Dates(54, 67, 9999) = false
* this.Dates(-1, -9, -900) = false
boolean isValid() {
if (this.getDay() >= 0
&& this.getDay() <= 31
&& this.getMonth() >= 0
&& this.getMonth() <= 12) {
return true;
else {
return false;
/** Calculates the age of a person given the date
* @return The age of the person
* Test Cases:
* this.Dates(12, 10, 1990), dateMarked.Dates(12, 10, 0) = 1990
* this.Dates( 4, 25, 1000), dateMarked.Dates(12, 10, -990) = 1990
* this.Dates( 1, 1, 2578), dateMarked.Dates(12, 10, 1989) = 589
int calculateAge( Date birthday ) {
return (this.getYear() - birthday.getYear());
/** Do two dates represent the exact same day?
* @param other The date to compare this Date against.
* @return true if (and only if) this Date represents the same day as other.
* (that is, the same year, month, day-of-month).
* Test Cases:
* this.Dates(12, 10, 1989), other.Dates(12, 10, 1989) = true
* this.Dates(12, 10, 1989), other.Dates(11, 10, 1989) = false
* this.Dates(12, 10, 1989), other.Dates(12, 9, 1989) = false
* this.Dates(12, 10, 1989), other.Dates(12, 10, 1988) = false
boolean isEqualTo( Date otherDate ) {
if (this.getDay() == otherDate.getDay()
&& this.getMonth() == otherDate.getMonth()
&& this.getYear() == otherDate.getYear()) {
return true;
else {
return false;
/** Does one Date precede another?
* @param other The date to compare this Date against.
* @return true if (and only if) this Date comes before other.
* this.Dates( 5, 5, 2000), other.Dates( 5, 6, 2000) = true
* this.Dates( 5, 5, 2000), other.Dates( 6, 5, 2000) = true
* this.Dates( 5, 5, 2000), other.Dates( 5, 5, 2001) = true
* this.Dates( 5, 5, 2000), other.Dates( 5, 4, 2000) = false
* this.Dates( 5, 5, 2000), other.Dates( 5, 5, 1999) = false
* this.Dates( 5, 5, 2000), other.Dates( 4, 5, 2000) = false
boolean isBefore( Date otherDate ) {
if (this.getYear() <= otherDate.getYear()
&& this.getMonth() <= otherDate.getMonth()
&& this.getDay() < otherDate.getDay()) {
return true;
else if (this.getYear() <= otherDate.getYear()
&& this.getMonth() < otherDate.getMonth()) {
return true;
else if (this.getYear() < otherDate.getYear()) {
return true;
else {
return false;
/** Determines how many days there are in the month, given the instance's specified month and year
* @Return returns the number of days in the month
int daysInTheMonth () {
if (this.isValid() == true) {
if (this.getMonth() == 2) {
if (this.isLeapYear() == true) {
return 29;
else {
return 28;
else if (this.getMonth() == 1
|| this.getMonth() == 3
|| this.getMonth() == 5
|| this.getMonth() == 7
|| this.getMonth() == 8
|| this.getMonth() == 10
|| this.getMonth() == 12) {
return 31;
else {
return 30;
else {
return 0;
/** Return the day after `this`. (`this` must be a valid date.)
* @return the day after `this`. The result will be valid if `this` is valid.
Date nextDay() {
if (this.getDay() == this.getDaysInTheMonth() && this.getMonth() == 12) {
return new Date(firstMonthInYear, firstDayInMonth, this.getYear() + 1);
else if (this.getDay() == this.getDaysInTheMonth()) {
return new Date(this.getMonth() + 1, firstDayInMonth, this.getYear());
else {
return new Date(this.getMonth(), this.getDay() + 1, this.getYear());
/** Return the day before `this`. (`this` must be a valid date.)
* @return the day before `this`. The result will be valid if `this` is valid.
Date previousDay() {
if (this.getDay() == 1 && this.getMonth() == 1) {
return new Date(lastMonthInYear, this.getDaysInTheMonth(), this.getYear() - 1); //Need to fix the days in the previous month and previous month
else if (this.getDay() == 1) {
return new Date(this.getMonth() - 1, this.getDaysInTheMonth() - 1, this.getYear()); //need to fix the days in the previous month
else {
return new Date(this.getMonth() - 1, this.getDaysInTheMonth(), this.getYear());
/** Returns a true or false depending on whether the year is a leap year or not
* @return a true or false depending on whether the year is a leap year or not
* Test Cases:
* this.Dates( 5, 5, 2000) = true
* this.Dates(12, 6, 2004) = true
* this.Dates( 1, 1, 2001) = false
* this.Dates( 7, 9, 2006) = false
boolean isLeapYear () {
if (this.getYear() % 400 == 0) {
return true;
else if (this.getYear() % 100 == 0) {
return false;
else if (this.getYear() % 4 ==0) {
return true;
else {
return false;
}null
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