I am having some issues with trying to figure out the correct way, or syntax, to join/concatenate a series of "name" columns from a separate table into a query.
Currently I am testing in LINQpad using two queries; the first returns all the master data that I use for other background work, and the second is a user-friendly version that I bind to a DGV. The issue comes in when I try to join the Physicians names like I do for a separate combobox.
This is what I have thus far - while it does return the Physician's name, it will NOT return the name if the TITLE field is NULL on the Physicians table.
Dim query1 = (From demog In data_Demogs
From MedHist In data_Demog_MedHists.where(Function(a) demog.ID_Demog = a.ID_Demog).defaultifempty
From BGLAssay In data_Demog_BGLs.where(Function(a) demog.ID_Demog = a.ID_Demog).defaultifempty
Select
demog.ID_Demog,
demog.Last_Name,
demog.First_Name,
demog.ID_Demog_AKA,
demog.DOB,
demog.Gender,
demog.ST_Complete,
demog.LT_Complete,
demog.LT_Due_Date,
demog.ID_Physician,
demog.ID_Reason_For_Call,
demog.Intl_Patient,
demog.Mayo_Patient,
MedHist.ID_Disease_Group,
MedHist.ID_Disease_Type,
BGLAssay.ID_BGL_Assay)
Dim query2 = (From items In query1
From demogAKA In data_Demogs.Where(Function(a) items.ID_Demog = a.ID_Demog_AKA).defaultifempty
From DType In tbl_Disease_Types.Where(Function(a) items.ID_Disease_Type = a.ID_Disease_Type).defaultifempty
From DGroup In tbl_Disease_Groups.Where(Function(a) items.ID_Disease_Group = a.ID_Disease_Group).defaultifempty
From RFC In tbl_Reason_For_Calls.Where(Function(a) items.ID_Reason_For_Call = a.ID_Reason_For_Call).defaultifempty
From Phys In tbl_Physicians.Where(Function(a) items.ID_Physician = a.ID_Physician).defaultifempty
From Title In tbl_Titles.Where(Function(a) Phys.ID_Title = a.ID_Title).defaultifempty
Select
items.ID_Demog,
items.Last_Name,
items.First_Name,
AKA_Name = demogAKA.Last_Name + ", " + demogAKA.First_Name,
items.DOB,
items.Gender,
items.ST_Complete,
items.LT_Complete,
items.LT_Due_Date,
DType.Disease_Type_Abr,
DGroup.Disease_Group_Name,
RFC.Reason_For_Call,
items.ID_Physician,
Phys_Name = Phys.Last_Name + ", " + Phys.First_Name + ", " + Title.Title
).distinct
console.writeline(Query2)
This is the currently query I for a combobox that DOES bring back all names, joining those names even if a field is NULL.
Dim Phys = (From e In tbl_Physicians
Group Join f In tbl_Titles On e.ID_Title Equals f.ID_Title
Into Matched = Group
From m In Matched.DefaultIfEmpty()
Select e.ID_Physician,
e.Last_Name,
e.First_Name,
e.Middle_Initial,
m.Title
).ToArray().Select(Function(item) New With {
.ID = item.ID_Physician,
.Phys_Name = (String.Join(", ",
String.Join(",",
New String() {item.Last_Name, item.First_Name, item.Title}).Split(
New Char() {","}, System.StringSplitOptions.RemoveEmptyEntries)))
})
Console.writeline(Phys)
When I try to add a third query to return just the Physician's name, and join that to the final query, I get the following error:
Local sequence cannot be used in LINQ to SQL implementations of query operators except the Contains operator.
'Query 1 removed to save space
Dim PhysNames = (From e In tbl_Physicians
Group Join f In tbl_Titles On e.ID_Title Equals f.ID_Title
Into Matched = Group
From m In Matched.DefaultIfEmpty()
Select e.ID_Physician,
e.Last_Name,
e.First_Name,
e.Middle_Initial,
m.Title
).ToArray().Select(Function(item) New With {
.ID = item.ID_Physician,
.Phys_Name = (String.Join(", ",
String.Join(",",
New String() {item.Last_Name, item.First_Name, item.Title}).Split(
New Char() {","}, System.StringSplitOptions.RemoveEmptyEntries)))
})
Dim query2 = (From items In query1
From demogAKA In data_Demogs.Where(Function(a) items.ID_Demog = a.ID_Demog_AKA).defaultifempty
From DType In tbl_Disease_Types.Where(Function(a) items.ID_Disease_Type = a.ID_Disease_Type).defaultifempty
From DGroup In tbl_Disease_Groups.Where(Function(a) items.ID_Disease_Group = a.ID_Disease_Group).defaultifempty
From RFC In tbl_Reason_For_Calls.Where(Function(a) items.ID_Reason_For_Call = a.ID_Reason_For_Call).defaultifempty
From Phys In PhysNames.Where(Function(a) items.ID_Physician = a.ID).defaultifempty
Select
items.ID_Demog,
items.Last_Name,
items.First_Name,
AKA_Name = demogAKA.Last_Name + ", " + demogAKA.First_Name,
items.DOB,
items.Gender,
items.ST_Complete,
items.LT_Complete,
items.LT_Due_Date,
DType.Disease_Type_Abr,
DGroup.Disease_Group_Name,
RFC.Reason_For_Call,
items.ID_Physician,
Phys.Phys_Name
).distinct
console.writeline(Query2)
When I try to join my working query into the final query, I get the following error:
Invalid cast from 'System.String' to 'VB$AnonymousDelegate_0`2[[System.Object, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934...
'Query1 removed to save space
Dim query2 = (From items In query1
From demogAKA In data_Demogs.Where(Function(a) items.ID_Demog = a.ID_Demog_AKA).defaultifempty
From DType In tbl_Disease_Types.Where(Function(a) items.ID_Disease_Type = a.ID_Disease_Type).defaultifempty
From DGroup In tbl_Disease_Groups.Where(Function(a) items.ID_Disease_Group = a.ID_Disease_Group).defaultifempty
From RFC In tbl_Reason_For_Calls.Where(Function(a) items.ID_Reason_For_Call = a.ID_Reason_For_Call).defaultifempty
From Phys In tbl_Physicians
Where items.ID_Physician = Phys.ID_Physician
Group Join f In tbl_Titles On Phys.ID_Title Equals f.ID_Title
Into Matched = Group
From m In Matched.DefaultIfEmpty()
Select
items.ID_Demog,
items.Last_Name,
items.First_Name,
AKA_Name = demogAKA.Last_Name + ", " + demogAKA.First_Name,
items.DOB,
items.Gender,
items.ST_Complete,
items.LT_Complete,
items.LT_Due_Date,
DType.Disease_Type_Abr,
DGroup.Disease_Group_Name,
RFC.Reason_For_Call,
items.ID_Physician,
PhysName = Function(a) String.Join(", ",
String.Join(",",
New String() {Phys.Last_Name, Phys.First_Name, m.Title}).Split(
New Char() {","}, System.StringSplitOptions.RemoveEmptyEntries))
).distinct
console.writeline(Query2)
After a long time playing around in LINQpad, and then finally re-reading JM's answer to a former question I had, I realized what I was doing wrong.
As per his post:
The problem is that, while LINQ in general has no issue with that code, LINQ to Entities does. LINQ syntax is the same for every provider but the implementation under the hood differs and, in the case of LINQ to Entities, your LINQ code has to translated to SQL and, in this case, there's no mapping from String.Join to SQL. That code would work fine with LINQ to Objects so one solution is to push that operation out of the original query and into a LINQ to Objects query. That would mean selecting the raw data with your LINQ to Entities query, calling ToList or ToArray on the result to materialise the query, then performing another query on that result. That second query will be LINQ to Objects rather than LINQ to Entities and so String.Join will not be an issue.
So... Once I realized I needed to push out the String.Join, I ended up with the following code:
Dim DispList = (From items In MastList
From demogAKA In dbACL.data_Demog.Where(Function(a) items.ID_Demog = a.ID_Demog_AKA).DefaultIfEmpty
From DType In dbACL.tbl_Disease_Type.Where(Function(a) items.ID_Disease_Type = a.ID_Disease_Type).DefaultIfEmpty
From DGroup In dbACL.tbl_Disease_Group.Where(Function(a) items.ID_Disease_Group = a.ID_Disease_Group).DefaultIfEmpty
From RFC In dbACL.tbl_Reason_For_Call.Where(Function(a) items.ID_Reason_For_Call = a.ID_Reason_For_Call).DefaultIfEmpty
From e In dbACL.tbl_Physician.Where(Function(a) items.ID_Physician = a.ID_Physician).DefaultIfEmpty
Group Join f In dbACL.tbl_Title On e.ID_Title Equals f.ID_Title
Into Matched = Group
From m In Matched.DefaultIfEmpty()
Select
items.ID_Demog,
items.Last_Name,
items.First_Name,
AKALname = demogAKA.Last_Name,
AKAFname = demogAKA.First_Name,
items.DOB,
items.Gender,
items.ST_Complete,
items.LT_Complete,
items.LT_Due_Date,
DType.Disease_Type_Abr,
DGroup.Disease_Group_Name,
RFC.Reason_For_Call,
items.ID_Physician,
PLName = e.Last_Name,
PFname = e.First_Name,
PMI = e.Middle_Initial,
PTitle = m.Title
).Distinct.ToList().Select(Function(a) New With {
a.ID_Demog,
a.Last_Name,
a.First_Name,
.AKA_Name = (String.Join(", ",
String.Join(",",
New String() {a.AKALname, a.AKAFname}).Split(
New Char() {","}, System.StringSplitOptions.RemoveEmptyEntries))),
a.DOB,
a.Gender,
a.ST_Complete,
a.LT_Complete,
a.LT_Due_Date,
a.Disease_Type_Abr,
a.Disease_Group_Name,
a.Reason_For_Call,
a.ID_Physician,
.PName = (String.Join(", ",
String.Join(",",
New String() {a.PLName, a.PFname, a.PTitle}).Split(
New Char() {","}, System.StringSplitOptions.RemoveEmptyEntries)))
}).ToList()
Dim ID_Section as Int32 = 10
Dim Query = From Book1 In db.Book1
Group Join Section In db.Section On CInt(Book1.ID_Section) Equals Section.ID_section _
And Section.ID_section Equals (ID_Section) Into Section_join = Group
From Section In Section_join.DefaultIfEmpty()
Select
Book1.ID_Book,
Book1.Name_Book,
ID_section = Section.ID_section,
Name_Section = Section.Name_Section
The error appears in the variable id_Section, since the Linq does not accept values from the outside, as it seems to me of course.
Here Error :
And Section.ID_section Equals (ID_Section)
In SQL Query Use At :
Declare #ID_Section int
SELECT Book.ID_Book, Book.Name_Book, Section.ID_section, Section.Name_Section
FROM Book LEFT OUTER JOIN
Section ON Book.ID_Section = Section.ID_section and Section.ID_section = #ID_Section
where Book.ID_Book =1
Using Where on db.Section with lambda syntax:
Dim Query = From Book1 In db.Book1
Group Join Section In db.Section.Where(Function(s) s.ID_section = ID_Section)
On CInt(Book1.ID_Section) Equals Section.ID_section _
Into Section_join = Group
From Section In Section_join.DefaultIfEmpty()
Select
Book1.ID_Book,
Book1.Name_Book,
ID_section = Section.ID_section,
Name_Section = Section.Name_Section
Alternatively you can apply the Where to the Join results:
Dim Query = From Book1 In db.Book1
Group Join Section In db.Section
On CInt(Book1.ID_Section) Equals Section.ID_section _
Into Section_join = Group
From Section In Section_join.Where(Function(s) s.ID_section = ID_Section).DefaultIfEmpty()
Select
Book1.ID_Book,
Book1.Name_Book,
ID_section = Section.ID_section,
Name_Section = Section.Name_Section
I have two dataTables ,and i want select all rows from DataTable1 where id is not in DataTable2.below what i have tried :
Sql = "select *,N°Reçu as NumRecu from V_Sit_J_Vente,V_Bien where V_Sit_J_Vente.Code_bien=V_Bien.Code_bien and date_situation <= '" + dt2 + "' and date_situation >= '" + dt1 + "'"
Dim GlobalDataVente As DataTable = utilitaire.getDataSet(Sql).Tables(0)
Sql = "select * from V_Reserv_Annule"
Dim GlobalDataAnnule As DataTable = utilitaire.getDataSet(Sql).Tables(0)
Dim query = (From order In GlobalDataVente.AsEnumerable() _
Where order!code_projet = tab.Rows(i).Item("code_projet")).ToList
Dim bannedCCList = From c In GlobalDataAnnule.AsEnumerable() _
Where c!type.Equals("Transfert acompte") = False And c!date_annule <= dt2
Dim exceptBanned = From c In query Group Join b In bannedCCList On c.Field(Of String)("N°Reçu") Equals b.Field(Of String)("num_reserv_remplace")
Into j() From x In j.DefaultIfEmpty() Where x Is Nothing Select c
What i want that "exceptBanned " containt all rows of "query" except row exist in "bannedCCList "
Thanks in advance
You can use Contains for this:
Dim query = (From order In GlobalDataVente.AsEnumerable() _
Where order!code_projet = tab.Rows(i).Item("code_projet")).ToList
Dim bannedCCList = From c In GlobalDataAnnule.AsEnumerable() _
Where c.type.Equals("Transfert acompte") = False And c.date_annule <= dt2
Select c.Field(Of String)("num_reserv_remplace")
Dim exceptBanned = From c In query
Where Not bannedCCList.Contains(c.Field(Of String)("N°Reçu"))
Select c
bannedCCList defines a query that produces the Id values you want to exclude; exceptBanned combines query with this list of Ids into a query that only runs once to return the final results. It works this way because bannedCCList is an IEnumerable. It isn't executed when it's defined, only when it's actually used.
I have two data on which I have applied the linq to select some lines :
csql = "select * from V_Vente where code_projet=" & ComProjet.GetColumnValue("code_projet") & " "
Dim tabVnt as Datatable = utilitaire.getDatatable(csql)
Dim query1 = tabVnt.AsEnumerable().Where(Function(r) DirectCast(r("date"), Date) >= dtDu And DirectCast(r("date"), Date) <= dtAu)
Dim tabAnnule As DataTable = utilitaire.getDatatable("select * from V_Reserv_Annule")
Dim query2 = From cust In tabAnnule.AsEnumerable() Where (cust.type = "définitif" Or cust.type = "Transfert") And cust.date_annule <= dtAu
now what i want is to select rows from "query1" where "Num_R" not exist in "query2".
The column "Num_r" exist in both datatable "tabVnt" and "tabAnnule"
I've tried this code but he doesn't work,please help me to find the error :
dim rows = from t1 in query1 .AsEnumerable() join t2 in query2.AsEnumerable() on t1.Field(Of String)("Num_r") equals t2.Field(Of String)("Num_r") Into tg
From tcheck In tg.DefaultIfEmpty()
Where tcheck = null
Select t1()
If I have understood your code right, you can check if second table's Num_rs does not contain the table one Num_r:
Dim rows = t1.Where(x=> !t2.Select(y=> y.Num_r).Contains(x.Num_r));
I have find the solution for my issus ,and i'd like to share it here with you :
Dim csql = "select * from V_Vente where code_projet=" & ComProjet.GetColumnValue("code_projet") & " "
Dim tabVnt As DataTable = utilitaire.getDatatable(csql)
Dim query1 = tabVnt.AsEnumerable().Where(Function(r) DirectCast(r("date"), Date) >= dt1 And DirectCast(r("date"), Date) <= dt2).ToList
Dim tabAnnule As DataTable = utilitaire.getDatatable("select * from V_Reserv_Annule")
bannedCCList = From c In tabAnnule.AsEnumerable() _
Where (c!type.Equals("définitif") = True Or c!type.Equals("Transfert") = True) And c!date_annule <= dt2
Select c.Field(Of String)("num_recu")
Dim exceptData = (From c In query1.AsEnumerable() _
Where Not bannedCCList.Contains(c.Field(Of String)("num_recu")) _
).ToList
I have this SQL statement and it joining 2 tables...
SELECT TRIDENT.Maintenance.RCFAs.*, TRIDENT.Maintenance.Equipment.EquipmentName
FROM TRIDENT.Maintenance.RCFAs
LEFT JOIN TRIDENT.Maintenance.Equipment
ON TRIDENT.Maintenance.Equipment.EquipmentId = TRIDENT.Maintenance.RCFAs.EquipmentId
WHERE 1 = 1
Now I have to reference a third table because I have a dropdown by the name of components that we will use to lookup stuff on the table named TRIDENT.Maintenance.RCFAXrefComponents. So if "bolts" is selected from the dropdown it will look up the YEAR and RCFAID which makes a unqiue key for both RCFAXrefComponents and RCFAs and checks if there are any rows in RCFAs that had "bolts" in the component column when looking up that YEAR and RCFAId. A coworker suggested I use an IN clause to check if the YEAR and RCFAId is in that RCFAXrefComponents. He said it might be tricky, but I'm a little lost on how to do this.
Below is the RCFAs table that I want to grab the YEAR and RCFAId values together and lookup on the other to see if that bolt is also there. Then it should bring up the line item on RCFAs table to output to user
this is RCFAXrefComponents table below
Public Shared Function GetRCFAList(rcfaNumber As Integer?, description As String,
failureType As String, equipmentDescription As String, componentSelection As String) As List(Of RCFA)
Dim sql = "SELECT r.*, e.EquipmentName FROM TRIDENT.Maintenance.RCFAs AS r LEFT JOIN TRIDENT.Maintenance.Equipment AS e ON e.EquipmentId = r.EquipmentId JOIN TRIDENT. Maintenance.RCFAXrefComponents AS c ON c.Year = r.Year AND c.RCFAId = r.RCFAId WHERE"
If failureType <> "" Then
sql += " AND RCFAs.FailureType = '" & failureType.ToUpper & "'"
End If
If description <> "" Then
sql += " AND RCFAs.ShortDesc LIKE '%" & description.ToUpper & "%'"
End If
If equipmentDescription <> "" Then
sql += " AND Equipment.EquipmentName LIKE '%" & equipmentDescription.ToUpper & "%'"
End If
If componentSelection <> "" Then
sql += " c.ComponentId = '%" & componentSelection.ToUpper & "%'"
End If
Dim dbConn As New Trident.Core.DBConnection
Dim ds = dbConn.FillDataSet(sql)
Dim tmpList As New List(Of RCFA)
For Each dr As DataRow In ds.Tables(0).Rows
tmpList.Add(New RCFA(New Trident.Objects.Maintenance.RCFA.RCFA(dr)))
Next
Return tmpList
End Function
Just use a simple JOIN with the RFCAXrefComponents table, and a WHERE clause that filters the component ID.
SELECT r.*, e.EquipmentName
FROM TRIDENT.Maintenance.RCFAs AS r
LEFT JOIN TRIDENT.Maintenance.Equipment AS e
ON e.EquipmentId = r.EquipmentId
JOIN TRIDENT.Maintenance.RCFAXrefComponents AS c
ON c.Year = r.Year
AND c.RCFAId = r.RCFAId
WHERE c.ComponentID = 'BOLTS'
I may be confused but it sounds like you need to use EXISTS.
SELECT r.*,
e.EquipmentName
FROM TRIDENT.Maintenance.RCFAs r
LEFT JOIN TRIDENT.Maintenance.Equipment e ON e.EquipmentId = r.EquipmentId
WHERE EXISTS ( SELECT 1
FROM TRIDENT.Maintenance.RCFAXrefComponents c
WHERE c.Year = r.Year
AND c.RCFAId = r.RCFAId
AND c.ComponentId LIKE '%BOLTS%' )
you may not need the c.ComponentId LIKE '%BOLTS%' you might just want c.ComponentId = 'BOLTS'