Databases
StackOverflow2013
Postsdbo
POComposable Query in ADO .NET EF returns more entities each iteration
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POComposable Query in ADO .NET EF returns more entities each iteration
    primarykey
    data
    text
    <p>StackOverflow!</p> <p>I have a MS SQL database. The part of this database is presented at the next picture </p> <p><img src="https://i.stack.imgur.com/DFnc5.png" alt="http://i.stack.imgur.com/DFnc5.png"></p> <p>I'm trying to make a complosable query, where I'm trying to find patients who had events with particular evEventKindID. For example, I want to find patients who have an event with (evEventKindtID == 1) and an event with (evEventKindID == 1).</p> <pre><code>var query = from pt in db.tblPatient select pt; var list = query.ToList();// {1} foreach (var limit in group.limits.Values) { if (limit.eventKind.Type == TypeOfEventKind.ekEvent) { query = from pt in query where (pt.tblEvent.Count(j =&gt; j.evEventKindID == limit.eventKind.ID) &gt; 0) select pt;// {2} list = query.ToList(); MessageBox.Show(query.Count().ToString()); } } </code></pre> <p>The problem is that every next iteration can return more elements than the previous. It counfuses me. How can query from query return more entities than the first query?</p> <p>In SQL Server Profiler I've found the SQL queries, generated by ADO .NET EF. In the place {1}:</p> <pre><code>SELECT [Extent1].[ptID] AS [ptID], [Extent1].[ptFullName] AS [ptFullName], [Extent1].[ptHomeAddress] AS [ptHomeAddress], [Extent1].[ptPhone] AS [ptPhone], [Extent1].[ptBirthDate] AS [ptBirthDate], [Extent1].[ptIsMale] AS [ptIsMale], [Extent1].[ptUserID] AS [ptUserID], [Extent1].[ptINN] AS [ptINN], [Extent1].[ptSNILS] AS [ptSNILS] FROM [dbo].[tblPatient] AS [Extent1] </code></pre> <p>In the place {2} on the first iteration:</p> <pre><code>exec sp_executesql N'SELECT [Project1].[ptID] AS [ptID], [Project1].[ptFullName] AS [ptFullName], [Project1].[ptHomeAddress] AS [ptHomeAddress], [Project1].[ptPhone] AS [ptPhone], [Project1].[ptBirthDate] AS [ptBirthDate], [Project1].[ptIsMale] AS [ptIsMale], [Project1].[ptUserID] AS [ptUserID], [Project1].[ptINN] AS [ptINN], [Project1].[ptSNILS] AS [ptSNILS] FROM ( SELECT [Extent1].[ptID] AS [ptID], [Extent1].[ptFullName] AS [ptFullName], [Extent1].[ptHomeAddress] AS [ptHomeAddress], [Extent1].[ptPhone] AS [ptPhone], [Extent1].[ptBirthDate] AS [ptBirthDate], [Extent1].[ptIsMale] AS [ptIsMale], [Extent1].[ptUserID] AS [ptUserID], [Extent1].[ptINN] AS [ptINN], [Extent1].[ptSNILS] AS [ptSNILS], (SELECT COUNT(1) AS [A1] FROM [dbo].[tblEvent] AS [Extent2] WHERE ([Extent1].[ptID] = [Extent2].[evPatientID]) AND ([Extent2].[evEventKindID] = @p__linq__0)) AS [C1] FROM [dbo].[tblPatient] AS [Extent1] ) AS [Project1] WHERE [Project1].[C1] &gt; 0',N'@p__linq__0 int',@p__linq__0=29 </code></pre> <p>And in the place {2} on the second iteration:</p> <pre><code>exec sp_executesql N'SELECT [Project2].[ptID] AS [ptID], [Project2].[ptFullName] AS [ptFullName], [Project2].[ptHomeAddress] AS [ptHomeAddress], [Project2].[ptPhone] AS [ptPhone], [Project2].[ptBirthDate] AS [ptBirthDate], [Project2].[ptIsMale] AS [ptIsMale], [Project2].[ptUserID] AS [ptUserID], [Project2].[ptINN] AS [ptINN], [Project2].[ptSNILS] AS [ptSNILS] FROM ( SELECT [Project1].[ptID] AS [ptID], [Project1].[ptFullName] AS [ptFullName], [Project1].[ptHomeAddress] AS [ptHomeAddress], [Project1].[ptPhone] AS [ptPhone], [Project1].[ptBirthDate] AS [ptBirthDate], [Project1].[ptIsMale] AS [ptIsMale], [Project1].[ptUserID] AS [ptUserID], [Project1].[ptINN] AS [ptINN], [Project1].[ptSNILS] AS [ptSNILS], (SELECT COUNT(1) AS [A1] FROM [dbo].[tblEvent] AS [Extent3] WHERE ([Project1].[ptID] = [Extent3].[evPatientID]) AND ([Extent3].[evEventKindID] = @p__linq__1)) AS [C1] FROM ( SELECT [Extent1].[ptID] AS [ptID], [Extent1].[ptFullName] AS [ptFullName], [Extent1].[ptHomeAddress] AS [ptHomeAddress], [Extent1].[ptPhone] AS [ptPhone], [Extent1].[ptBirthDate] AS [ptBirthDate], [Extent1].[ptIsMale] AS [ptIsMale], [Extent1].[ptUserID] AS [ptUserID], [Extent1].[ptINN] AS [ptINN], [Extent1].[ptSNILS] AS [ptSNILS], (SELECT COUNT(1) AS [A1] FROM [dbo].[tblEvent] AS [Extent2] WHERE ([Extent1].[ptID] = [Extent2].[evPatientID]) AND ([Extent2].[evEventKindID] = @p__linq__0)) AS [C1] FROM [dbo].[tblPatient] AS [Extent1] ) AS [Project1] WHERE [Project1].[C1] &gt; 0 ) AS [Project2] WHERE [Project2].[C1] &gt; 0',N'@p__linq__0 int,@p__linq__1 int',@p__linq__0=31,@p__linq__1=31 </code></pre> <p>What do you think about this problem?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMohsen Safari
    1. USmpMelnikov
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POComposable Query in ADO .NET EF returns more entities each iteration
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POComposable Query in ADO .NET EF returns more entities each iteration
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POComposable Query in ADO .NET EF returns more entities each iteration
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload