Data not passed from controller to view - asp.net-mvc-4

i have one webapi app in which i have one code to populate a table in the view
the controller(Home) code is
[HttpGet]
public List<Employee> GetEmployees()
{
var com = new TrainingDBEntities();
var records = from emp in com.tblEmployees
select new Employee
{
empID = emp.empID,
empName = emp.empName,
skill=emp.skill,
};
return records.ToList();
}
and in view
//show emp details
$('#btshw').click(function () {
$.ajax({
url: "/Home/GetEmployees",
success: function (result) {
console.log(result);
for (var i = 0; i < result.length; i++) {
var Row = "<tr><td>";
Row += result[i].empID + "</td><td>";
Row += result[i].empName + "</td><td>";
Row += result[i].skill + "</td><td>";
$('#emplist').append(Row);
}
$('#emplist').append("</table>");
}
,
error: function (err) {
alert(err.status.Text);
}
});
});
but after execution i got a table having 3 columns and all having values 'undefined' , i have debug the code and in the onclick event its going to the controller and it returns the correct value but data is not correct when reaching in the view(in ajax code)

You can change the result type to JsonResult:
[HttpGet]
public JsonResult GetEmployees()
{
var com = new TrainingDBEntities();
var records = from emp in com.tblEmployees
select new Employee
{
empID = emp.empID,
empName = emp.empName,
skill = emp.skill,
};
return Json(records.ToList(), JsonRequestBehavior.AllowGet);
}

Related

Inserting Nested Objects EF Core 5

I have the following entities:
Batch
Samples
SampleContainers
SampleTests
A batch contains many samples. A sample contains many SampleContainers and many SampleTests.
I am trying to make a copy of batch and insert into database.
Attempt #1: get function in repository:
return await context.Set<TEntity>().FindAsync(id);
Controller:
var coc = await repository.Get(batchId);
coc.BatchStatusId = (int)Enums.BatchStatus.InProgress;
coc.IsTemplate = false;
coc.Id = 0;
var b = await repository.Add(coc);
Here only batch object was duplicated but related samples and containers were not duplicated/inserted.
Attempt #2: I changed my Get function as follows:
public async override Task<Batch> Get(int id)
{
return await context.Set<Batch>()
.Include(p => p.Samples)
.FirstOrDefaultAsync(p => p.Id == id);
}
This time batch was duplicated but samples and containers and tests were all updated with new batchId/FK (I wanted them all to be duplicated).
Attempt #3: following this, I implemented as follows:
public async Task<int> DuplicateBatch([FromBody]int batchId)
{
try
{
var coc = await repository.Get(batchId);
coc.BatchStatusId = (int)Enums.BatchStatus.InProgress;
coc.IsTemplate = false;
coc.Id = 0;
var samples = coc.Samples.ToList();
repository.DetachEntity(coc);
var b = await repository.Add(coc);
var allSampleTests = await sampleTestRepo.GetAll();
var allSampleContainers = await sampleContainersRepo.GetAll();
var sampletests = from st in allSampleTests
join s in samples on st.SampleId equals s.Id
select st;
var sampleContainers = from sc in allSampleContainers
join s in samples on sc.SampleId equals s.Id
select sc;
sampleRepo.DetachEntities(samples);
sampleTestRepo.DetachEntities(sampletests.ToList());
sampleContainersRepo.DetachEntities(sampleContainers.ToList());
foreach (var s in samples)
{
s.BatchId = b.Id;
var sample = await sampleRepo.Add(s);
foreach (var st in sampletests)
{
st.SampleId = sample.Id;
await sampleTestRepo.Add(st);
}
foreach(var sc in sampleContainers)
{
sc.SampleId = sample.Id;
await sampleContainersRepo.Add(sc);
}
}
return 1;
}
catch (Exception ex)
{
return 0;
}
}
This time I am facing the following exception as soon as I reach Detach function:
{"The property 'Batch.Id' is part of a key and so cannot be modified
or marked as modified. To change the principal of an existing entity
with an identifying foreign key, first delete the dependent and invoke
'SaveChanges', and then associate the dependent with the new
principal."}
This is how I did it, most of it is self explanatory.
public async Task<int> DuplicateBatch([FromBody]int batchId)
{
try
{
//STEP 1: Fetch the entities
var coc2 = await repository.Get(batchId);
var samples = coc2.Samples.ToList();
var allSampleTests = await sampleTestRepo.GetAll();
var allSampleContainers = await sampleContainersRepo.GetAll();
var sampletests = samples.SelectMany(st => st.SampleTests).ToList();
var samplecontainers = samples.SelectMany(st => st.SampleContainers).ToList();
//STEP 2: Detach
var coc = repository.DetachEntity(coc2);
var samplesDetached = sampleRepo.DetachEntities(samples);
var sampleTestsDetached = sampleTestRepo.DetachEntities(sampletests);
var sampleContianersDetached = sampleContainersRepo.DetachEntities(samplecontainers);
//STEP 3: Update object
coc2.BatchStatusId = (int)Enums.BatchStatus.InProgress;
coc2.IsTemplate = false;
var b = await repository.Add(coc);
return 1;
}
catch (Exception ex)
{
return 0;
}
}

SqlKata how to insert many value from a list

How can I execute an insertmany using sqlkata? I have a list and I want to perform an insertmany
public async Task<TimeSpan> AddBulk(List<Transaction> transactions)
{
var cols = new[] { "Id", "Name", "Description", "Quantity", "AddedOn", "ModifiedOn" };
Start = DateTime.Now;
try
{
var result = await _db.Query("Transaction").InsertAsync(cols, new[] { transactions });
}
catch(Exception ex)
{
}
TimeSpan = DateTime.Now - Start;
return TimeSpan;
}
Have you tried this:
var result = _db.Query("Transaction").AsInsert(cols, transactions);
You can convert the list of your data to List<object[]> then try to insert multiple records like this:
var cols = new[] {
"YourField1",
"YourField2" ,
"YourField3"
};
var data = new List<object[]>();
foreach (var item in YourListObject)
{
data.Add(new object[]
{
item.YourField1,
item.YourField2,
item.YourField3
});
}
var affectedRows = _db.Query(typeof(Permission).Name)
.Insert(cols, p);

Im using datatable in my project mvc , i want display Categorie name in place of categorye id foreign key in table courses

[HttpGet]
public JsonResult GetData()
{``
ApplicationDbContext db = new ApplicationDbContext();
var course = db.Courses
.Include(d=>d.Competences)
.Include(d=>d.Sequences)
.ToList().Select(p => new { Id = p.Id, Titre = p.Titre, ShortDescription = p.ShortDescription, Price = p.Price, CategorieId = p.CategorieId });
var query = from q in db.Courses
join cat in db.Categories.AsEnumerable()
on q.CategorieId equals cat.Libelle
enter code here
return Json(new { data = course },
JsonRequestBehavior.AllowGet);
}

Convert EntityFramework to Raw SQL Queries in MVC

I am trying to make a crud calendar in my .net, my question is, How do make the below entity framework codes to SQL queries?
[HttpPost]
public JsonResult SaveEvent(Event e)
{
var status = false;
using (MyDatabaseEntities dc = new MyDatabaseEntities())
{
if (e.EventID > 0)
{
//Update the event
var v = dc.Events.Where(a => a.EventID == e.EventID).FirstOrDefault();
if (v != null)
{
v.Subject = e.Subject;
v.Start = e.Start;
v.End = e.End;
v.Description = e.Description;
v.IsFullDay = e.IsFullDay;
v.ThemeColor = e.ThemeColor;
}
}
else
{
dc.Events.Add(e);
}
dc.SaveChanges();
status = true;
}
return new JsonResult { Data = new { status = status } };
}
http://www.dotnetawesome.com/2017/07/curd-operation-on-fullcalendar-in-aspnet-mvc.html
Thanks guys
You can run raw query in entity framework with dc.Database.ExecuteSqlCommand() command like below:
var status = false;
using (MyDatabaseEntities dc = new MyDatabaseEntities())
{
if (e.EventID > 0)
{
dc.Database.ExecuteSqlCommand(&#"
UPDATE Events
SET Subject = {e.Subject},
Start = {e.Start},
End = {End},
Description = {Description},
IsFullDay = {IsFullDay},
ThemeColor = {ThemeColor},
WHERE EventID = {e.EventID}
IF ##ROWCOUNT = 0
INSERT INTO Events (EventID, Subject, Start, End, Description, IsFullDay, ThemeColor)
VALUES ({e.EventID}, {e.Subject}, ...)
");
status = true;
}
return new JsonResult { Data = new { status = status }
};

Why does this controller double the inserts when I try to archive the results of the Bing Search API?

I'm trying to archive my search results for a term by
Using the Bing API in an async controller
Inserting them into database using Entity Framework
using the Bing API and insert them into a database using entity framework. For whatever reason it is returning 50 results, but then it enters 100 results into the database.
My Controller Code:
public class DHWebServicesController : AsyncController
{
//
// GET: /WebService/
private DHContext context = new DHContext();
[HttpPost]
public void RunReportSetAsync(int id)
{
int iTotalCount = 1;
AsyncManager.OutstandingOperations.Increment(iTotalCount);
if (!context.DHSearchResults.Any(xx => xx.CityMarketComboRunID == id))
{
string strBingSearchUri = #ConfigurationManager.AppSettings["BingSearchURI"];
string strBingAccountKey = #ConfigurationManager.AppSettings["BingAccountKey"];
string strBingUserAccountKey = #ConfigurationManager.AppSettings["BingUserAccountKey"];
CityMarketComboRun cityMarketComboRun = context.CityMarketComboRuns.Include(xx => xx.CityMarketCombo).Include(xx => xx.CityMarketCombo.City).First(xx => xx.CityMarketComboRunID == id);
var bingContainer = new Bing.BingSearchContainer(new Uri(strBingSearchUri));
bingContainer.Credentials = new NetworkCredential(strBingUserAccountKey, strBingAccountKey);
// now we can build the query
Keyword keyword = context.Keywords.First();
var bingWebQuery = bingContainer.Web(keyword.Name, "en-US", "Moderate", cityMarketComboRun.CityMarketCombo.City.Latitude, cityMarketComboRun.CityMarketCombo.City.Longitude, null, null, null);
var bingWebResults = bingWebQuery.Execute();
context.Configuration.AutoDetectChangesEnabled = false;
int i = 1;
DHSearchResult dhSearchResult = new DHSearchResult();
List<DHSearchResult> lst = new List<DHSearchResult>();
var webResults = bingWebResults.ToList();
foreach (var result in webResults)
{
dhSearchResult = new DHSearchResult();
dhSearchResult.BingID = result.ID;
dhSearchResult.CityMarketComboRunID = id;
dhSearchResult.Description = result.Description;
dhSearchResult.DisplayUrl = result.DisplayUrl;
dhSearchResult.KeywordID = keyword.KeywordID;
dhSearchResult.Created = DateTime.Now;
dhSearchResult.Modified = DateTime.Now;
dhSearchResult.Title = result.Title;
dhSearchResult.Url = result.Url;
dhSearchResult.Ordinal = i;
lst.Add(dhSearchResult);
i++;
}
foreach (DHSearchResult c in lst)
{
context.DHSearchResults.Add(c);
context.SaveChanges();
}
AsyncManager.Parameters["message"] = "The total number of results was "+lst.Count+". And there are " + context.DHSearchResults.Count().ToString();
}
else
{
AsyncManager.Parameters["message"] = "You have already run this report";
}
AsyncManager.OutstandingOperations.Decrement(iTotalCount);
}
public string RunReportSetCompleted(string message)
{
string str = message;
return str;
}
}
Here is how I am calling it from my asp.net mvc 4 page.
#Ajax.ActionLink("Run Report", "GatherKeywordsFromBing", "DHWebServices",
new { id=item.CityMarketComboRunID},
new AjaxOptions { OnSuccess = "ShowNotifier();", UpdateTargetId = "TopNotifierMessage", HttpMethod = "POST", InsertionMode = InsertionMode.Replace, LoadingElementId = strCityMarketComboProgressID, LoadingElementDuration = 1000 },
new { #class = "ViewLink" })
<span class="ProgressIndicator" id="#strCityMarketComboProgressID"><img src="#Url.Content("~/Content/img/SmallBall.gif")" alt="loading" /></span>
For whatever reason all of
Try saving only once:
foreach (DHSearchResult c in lst)
{
context.DHSearchResults.Add(c);
}
context.SaveChanges();
Also there's nothing asynchronous in your code, so there's no point of using asynchronous controller. Not only that it won't improve anything but it might make things worse.