I create a dateRange wich is an array of dates.
Then I have an array of day numbers like 0 for Sunday, 1 for Monday etc...
Now I want to get all dateRange dates according to the visibleWeekDays array.
The solution is in the getVisibleDateRange function.
But I want to do it with LINQ because why reinvent the wheel...
The inner or outer selector would still need a .day() because one of the selector is a momentJS object.
But to get the day of week I would need to put the ".day()" into the linqJS string which can not work...
What would be your solution with linqJS ?
// Arrange
var startDate = moment(new Date(2014, 1, 1));
var endDate = moment(new Date(2014, 1, 15));
var visibleWeekDays = [0,1]
// Act
var dates = dateFactory.dateRange(startDate, endDate);
var visibleDays = dateFactory.getVisibleDateRange(visibleWeekDays ,dates);
function getVisibleDateRange(visibleWeekDays, dateRange) {
var visibleDateRange = [];
for (var i = 0; i < dateRange.length; i++) {
for (var j = 0; j < visibleWeekDays.length; j++) {
var currentDate = dateRange[i];
var dayOfWeek = currentDate.day();
var visibleDayOfWeek = visibleWeekDays[j];
if (visibleDayOfWeek === dayOfWeek) {
visibleDateRange.push(currentDate);
}
}
}
return visibleDateRange;
}
var visibleDateRange = Enumerable.from(visibleWeekDays).join(dateRange,"","","outer,inner=>outer + ':' + inner")
Here's how I would write the inner join:
var dateRange = Enumerable.Range(1, 15).Select("new Date(2014, 1, $)");
var visibleWeekDays = Enumerable.From([0, 1]);
var visibleDateRange = dateRange.Join(visibleWeekDays,
"$.getDay()", // outer selector
"$", // inner selector
"$") // result selector (select outer value, the date)
.ToArray();
Here, I've used a more compact syntax for defining lambdas. Basically lambdas will generally have at most 4 paramters. So you can reference the nth parameter simply by adding additional $'s in the identifier. So $ refers to the first parameter, $$ the second, etc.
The parameters of the join is exactly the same as in the call you would make in LINQ. The first parameter is the inner collection, then the outer selector, inner selector, and result selector.
Since the outer collection is the dates, you have access the corresponding item and its properties. Since we want to get the result of calling date.getDay(), you simply call getDay() on the object (the first parameter).
Related
I'm using ASP.NET Core 3.1. I have written some code like the following and now I want to get the result of these two queries that has the same size and iterate over each one of them and divide their element and store the result in a list. But now the problem is in my zip method, I can not specify exactly which attribute of each query I want to divide.
var mytotal = _context.Apiapp.GroupBy(o => new
{
Month = o.ApiRequestDate.Substring(4, 2),
Year = o.ApiRequestDate.Substring(0, 4)
}).Select(g => new
{
Month = g.Key.Month,
Year = g.Key.Year,
Total = g.Count()
}).OrderByDescending(a => a.Year).ThenByDescending(a => a.Month).ToList();
var numerator = from t1 in _context.Apiapp
join t2 in _context.ApiAppHistory on t1.Id equals t2.ApiApplicantId
join t3 in _context.EntityType on t2.LastReqStatus equals t3.Id
where t1.IsDeleted == false && t1.LastRequestStatus == t2.Id && t3.Name == "granted"
group new { Year = t1.ApiRequestDate.Substring(0, 4), Month = t1.ApiRequestDate.Substring(4, 2) }
by new { t2.LastReqStatus } into g
select new
{
Year = g.Max(n => n.Year),
Month = g.Max(n => n.Month),
GrantedCount = g.Count()
};
var GrantedReqStatus = numerator.ToList();
var GrantedAccessPercent = new List<Double>();
//-------------------------------------------------------
var res = mytotal.Zip(GrantedReqStatus, (total, GrantedCount) => new { Num = total, Denum = GrantedCount });
foreach(var r in res)
{
GrantedAccessPercent.Add(r.Num/r.Denum);
}
Here inside the body of foreach, r.Num and r.Denum is unknown! I appreciate of any help to fix the error.
The Num and DemNum in the Zip function represent objects for the first and second collection, that contains Month,Year and Total for the total object and Month,Year and GrantedCount for the grantedCount object.
You could use total.Total and grantedCount.GrantedCount to get numbers, like the following code:
var res = mytotal.Zip(GrantedReqStatus, (total, grantedCount) => new { Num = total.Total, Denum = grantedCount.GrantedCount });
foreach(var r in res)
{
GrantedAccessPercent.Add(Math.Round(r.Num / (double)r.DemNum, 2));
}
Note that, to divide int1/int2 you need to cast int2 to double, Will give the expected result, and you can use also Math.Round to specify numbers after comma.
I hope this help you fix the issue.
Thanks already to Serge insas for his insight both here and here, which have been a godsend for me already. But...I'm having trouble tying everything together with date validation.
To clarify, I have a GAS intended to verify that the date in Column A is (a) more than seven days old and (b) not null. If both pass, the script determines the first empty row in Column G, and then pauses before completing various functions. The beginning of the script looks like...
function getStats() {
var doc = SpreadsheetApp.getActiveSpreadsheet();
var sheet = doc.getSheetByName("Main");
var TITLE_ROW = 1;
var DATE_COL = 1;
var URL_COL = 4;
var sevendaysBefore = new Date(new Date().getTime()-7*24*60*60*1000);
if (DATE_COL != ''||(DATE_COL != null || DATE_COL< sevendaysBefore)) {
var end = sheet.getLastRow();
for( var i = 1; i < end; i++) {
var Gvals = sheet.getRange("G1:G").getValues();
var Glast = Gvals.filter(String).length;
var rowNum = TITLE_ROW+Glast;
var itemurl = sheet.getRange(rowNum,URL_COL).getValues();
Utilities.sleep(500);
...
I've clearly implemented something wrong, though, because the date validation doesn't workâthe script appears to function as though the data in Column A doesn't matter. I'm sure I've done something incredibly idiotic, but I'm too ignorant to spot it on my own. So...anyone know what I've overlooked?
While the other answer is probably working (didn't test), its approach is very different from yours.
Below is code that follows the same logic as yours but works at the array level (to follow recommendations in Best practices).
I added a few comments to show the differences, hoping it will help you to understand how it works.
function getStats() {
var doc = SpreadsheetApp.getActiveSpreadsheet();
var sheet = doc.getSheetByName("Main");
var Glast; // define the variable for later use
var vals = sheet.getDataRange().getValues();// get all data in an array (do that before loop)
var TITLE_ROW = 0;// use array index instead of real row numbers
var DATE_COL = 0;// use array index instead of real column numbers
var URL_COL = 3;// use array index instead of real column numbers
var sevendaysBefore = new Date(new Date().getTime()-7*24*60*60*1000).getTime();// get native value in milliseconds to make comparison easier below
for( var i = 1; i < vals.length; i++) { // start loop from Row 2 (=array index 1)
if(vals[i][0]!='' && vals[i][0]!=null&&vals[i][0].getTime()<sevendaysBefore){continue};// use && instead of ||, we want ALL conditions to be true ( see !='' and !=null)
Glast = i; break ;// first occurrence of data meeting above condition (non null and date < 7 days before)
}
var itemurl = vals[Glast][URL_COL];// get the value from the array
Utilities.sleep(500);
//...
Mistake : You are hard coding DATE_COL = 1 and you are using this in if statement. It doesn't get the value of the cell. Also I am not getting your statement "date in Column A is (a) more than seven days old". Is that date is from a cell or you are iterating through all the cells in column A ?.
Below code will satisfy your need and I tested. Here as example I am checking date validation for cell R1C1(A1).
1)Get the date from cell. You can change it or Iterate the cells in column for date.
2) We have date.valueOf() method which returns the number of milliseconds since midnight 1970-01-01.
3) Validation : check the cell data is date and greater than 7 days
function compDate()
{
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getActiveSheet();
var cell = sheet.getRange("A1"); //point1
var date01 = new Date();
var date02 = cell.getValue(); //point2
var dateDiff = (date01.valueOf()-date02.valueOf())/(24*60*60*1000);
if((isValidDate(date02)) == true && dateDiff > 7) //point3
Logger.log("success");
}
//below function will return true if the arg is valid date and false if not.
function isValidDate(d) {
if ( Object.prototype.toString.call(d) !== "[object Date]" )
return false;
return !isNaN(d.getTime());
}
I'm using LINQ's Union method to combine two or more collections. After that I'm trying to apply sorting to the combined collection by calling OrderBy on a field that is common to the collections. Here is how I am applying sorting:
combinedCollection.OrderBy(row => row["common_field"]);
combinedCollection is defined as:
Enumerable<DataRow> combinedCollection;
I need the sorting to be applied to the entire combined collection. For some reason, that is not happening. Instead I see there is sorting applied on some other field separately within each 'collection' block within the combined collection
And idea why??
First Edit
foreach (....)
{
if (combinedCollection != null)
{
combinedCollection = combinedCollection.Union(aCollection);
}
else
{
combinedCollection = aCollection;
}
}
Second Edit
_Cmd.CommandText = "SELECT Person.Contact.FirstName, Person.Contact.LastName, Person.Address.City, DATEDIFF(YY, HumanResources.Employee.BirthDate, GETDATE()) AS Age"
+ " FROM HumanResources.EmployeeAddress INNER JOIN"
+ " HumanResources.Employee ON HumanResources.EmployeeAddress.EmployeeID = HumanResources.Employee.EmployeeID INNER JOIN"
+ " Person.Address ON HumanResources.EmployeeAddress.AddressID = Person.Address.AddressID INNER JOIN"
+ " Person.Contact ON HumanResources.Employee.ContactID = Person.Contact.ContactID AND HumanResources.Employee.ContactID = Person.Contact.ContactID AND "
+ " HumanResources.Employee.ContactID = Person.Contact.ContactID AND HumanResources.Employee.ContactID = Person.Contact.ContactID";
DataTable employeeTable = new DataTable();
_Adpt.Fill(employeeTable);
DataRow[] allRows = null;
allRows = employeeTable.Select("");
IEnumerable<DataRow> filteredEmployeeRows;
filteredEmployeeRows = from row in allRows select row;
// Declare a variable to hold the city-filtered rows and set it to null for now
IEnumerable<DataRow> cityFilteredEmployeeRows = null;
//Copy filtered rows into a data table
DataTable filteredEmployeeTable = filteredEmployeeRows.CopyToDataTable<DataRow>();
foreach (DataRowView city in CityListBox.SelectedItems)
{
// create an exact copy of the data table
DataTable filteredEmployeeCopyTable = filteredEmployeeTable.Copy();
// Enumerate it
IEnumerable<DataRow> filteredEmployeeRowsInSingleCity = filteredEmployeeCopyTable.AsEnumerable();
// Apply the city filter
filteredEmployeeRowsInSingleCity = _ApplyCityFilter(filteredEmployeeRowsInSingleCity, city["City"].ToString());
if (cityFilteredEmployeeRows != null)
{
// Combine the filtered rows for this city with the overall collection of rows
cityFilteredEmployeeRows = cityFilteredEmployeeRows.Union(filteredEmployeeRowsInSingleCity);
}
else
{
cityFilteredEmployeeRows = filteredEmployeeRowsInSingleCity;
}
}
//apply ordering
cityFilteredEmployeeRows.OrderBy(row => row["Age"]);
//cityFilteredEmployeeRows.OrderByDescending(row => row["Age"]);
EmployeeGridView.DataSource = cityFilteredEmployeeRows.CopyToDataTable<DataRow>();
.......
private IEnumerable<DataRow> _ApplyCityFilter(IEnumerable<DataRow> filteredEmployeeRows, string city)
{
IEnumerable<DataRow> temp = filteredEmployeeRows;
filteredEmployeeRows = from row in temp
where row["City"].ToString() == city
select row;
return filteredEmployeeRows;
}
I think you have a problem with the LINQ lazy evaluation, I would have to investigate to find out wich part causes the problem.
Using the foreach(var item...) in lazy functions has already bitten me (because when executed later they all reference the last iterated item), but in your case it doesn't look like this is the problem.
To check it is the really the issue you can just use a DataRow[] in place of the IEnumerable<DataRow> and call .ToArray() after every LINQ function.
Edit: I'm not sure I got your code right but can't you just use:
var cities = CityListBox.SelectedItems.Cast<DataRowView>()
.Select(city => city["City"].ToString())
.ToArray();
var rows = allRows
.Where(r => cities.Contains((string)r["City"]))
.OrderBy(r => (int?)r["Age"])
.ToArray(); // if you want to evaluate directly, not mandatory
I have an array filled with long type values and for each value in the array I need to implement a query. I used foreach loop as you can see from the code below:
var result;
foreach(long id in PrdIdArr)
{
var mainQuery = (from o in db.OPERATIONs
join u in db.UNITs on o.OP_UNIT_ID equals u.UNIT_ID into smt
from s in smt
join x in db.XIDs on s.UNIT_ID equals x.UNIT_ID
where o.OP_OT_CODE == OtCode
where x.IDTYP_CD == "BSN"
where s.START_PRD_ID == id
where o.OP_UPD_DATE >= _StartDate
where o.OP_UPD_DATE <= _EndDate
select new
{
o.OP_ID,
o.OP_UPD_DATE,
x.EXTERNAL_ID,
o.OP_OS_CODE,
o.OP_START,
o.OP_ST_STATION,
s.START_PRD_ID
}).Take(_RowNumber);
//var result = mainQuery.ToList();
result.add(mainQuery.ToList());
}
data = this.Json(result);
data.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
return data;
However, I have a problem in my code; I have to define a main list just before the foreach loop so that I could add results of each query to the that main list. my question is: How can I define this list as you can see at the beginning of my code? Thanks for the help...
How can I define this list as you can see at the beginning of my code?
Make
new {
o.OP_ID,
o.OP_UPD_DATE,
x.EXTERNAL_ID,
o.OP_OS_CODE,
o.OP_START,
o.OP_ST_STATION,
s.START_PRD_ID
}
into a concrete type (say QueryResult, although something a little more specific than that), and then just declare
var result = new List<QueryResult>();
Also, you should consider turning
foreach(long id in PrdIdArr)
and
where s.START_PRD_ID == id
into
where PrdIdArr.Contains(s.Start_PRD_ID)
var result = new List<object>();
foreach(long id in PrdIdArr)
{
....
result.Add(mainQuery.ToList());
}
You could do this:
var result = PrdIdArr.Select(id =>
from o in db.OPERATIONs
join u in db.UNITs on o.OP_UNIT_ID equals u.UNIT_ID into smt
from s in smt
join x in db.XIDs on s.UNIT_ID equals x.UNIT_ID
where o.OP_OT_CODE == OtCode
where x.IDTYP_CD == "BSN"
where s.START_PRD_ID == id
where o.OP_UPD_DATE >= _StartDate
where o.OP_UPD_DATE <= _EndDate
select new
{
o.OP_ID,
o.OP_UPD_DATE,
x.EXTERNAL_ID,
o.OP_OS_CODE,
o.OP_START,
o.OP_ST_STATION,
s.START_PRD_ID
}
.Take(_RowNumber)
.ToList()
).ToList();
I highly recommend performing some Extract Method refactorings, as the code is pretty complex and hard to understand/mange this way.
Just create the anonymous type outside with the same property names and the correct type
var result = Enumerable.Range(0, 0).Select(x => new
{
OP_ID = 1,
OP_UPD_DATE = DateTime.Now,
EXTERNAL_ID = 1,
OP_OS_CODE = 1,
OP_START = DateTIme.Now,
OP_ST_STATION = "",
START_PRD_ID = 1,
}).ToList();
And in your loop call AddRange
result.AddRange(mainQuery.ToList());
I have a linq query like this:
var accounts =
from account in context.Accounts
from guranteer in account.Gurantors
where guranteer.GuarantorRegistryId == guranteerRegistryId
select new AccountsReport
{
recordIndex = ?
CreditRegistryId = account.CreditRegistryId,
AccountNumber = account.AccountNo,
}
I want to populate recordIndex with the value of current row number in collection returned by the LINQ. How can I get row number ?
Row number is not supported in linq-to-entities. You must first retrieve records from database without row number and then add row number by linq-to-objects. Something like:
var accounts =
(from account in context.Accounts
from guranteer in account.Gurantors
where guranteer.GuarantorRegistryId == guranteerRegistryId
select new
{
CreditRegistryId = account.CreditRegistryId,
AccountNumber = account.AccountNo,
})
.AsEnumerable() // Moving to linq-to-objects
.Select((r, i) => new AccountReport
{
RecordIndex = i,
CreditRegistryId = r.CreditRegistryId,
AccountNumber = r.AccountNo,
});
LINQ to objects has this builtin for any enumerator:
http://weblogs.asp.net/fmarguerie/archive/2008/11/10/using-the-select-linq-query-operator-with-indexes.aspx
Edit: Although IQueryable supports it too (here and here) it has been mentioned that this does unfortunately not work for LINQ to SQL/Entities.
new []{"aap", "noot", "mies"}
.Select( (element, index) => new { element, index });
Will result in:
{ { element = aap, index = 0 },
{ element = noot, index = 1 },
{ element = mies, index = 2 } }
There are other LINQ Extension methods (like .Where) with the extra index parameter overload
Try using let like this:
int[] ints = new[] { 1, 2, 3, 4, 5 };
int counter = 0;
var result = from i in ints
where i % 2 == 0
let number = ++counter
select new { I = i, Number = number };
foreach (var r in result)
{
Console.WriteLine(r.Number + ": " + r.I);
}
I cannot test it with actual LINQ to SQL or Entity Framework right now. Note that the above code will retain the value of the counter between multiple executions of the query.
If this is not supported with your specific provider you can always foreach (thus forcing the execution of the query) and assign the number manually in code.
Because the query inside the question filters by a single id, I think the answers given wont help out. Ofcourse you can do it all in memory client side, but depending how large the dataset is, and whether network is involved, this could be an issue.
If you need a SQL ROW_NUMBER [..] OVER [..] equivalent, the only way I know is to create a view in your SQL server and query against that.
This Tested and Works:
Amend your code as follows:
int counter = 0;
var accounts =
from account in context.Accounts
from guranteer in account.Gurantors
where guranteer.GuarantorRegistryId == guranteerRegistryId
select new AccountsReport
{
recordIndex = counter++
CreditRegistryId = account.CreditRegistryId,
AccountNumber = account.AccountNo,
}
Hope this helps.. Though its late:)