C# - Get All Row Columns Dynamically In The Select Clause?
Nov 22, 2011
I have two DataTables, PersonInformationDataTable on which i only know about a "CityName" field, and another CityInformationDataTable, which has a few constant fields and i do a query like
ResultOfQuery = From person As DataRow in PersonInformationDataTable
From CityInfo As DataRow in CityInformationDataTable
Where (person("CityName) = CityInfo("CityName"))
Select ?? all person info ?? , Country = CityInfo("Country"), Tongue = CityInfo("SpokenTongue")
I would like again all the person fields with their values in the enumerable result.
the result would be like : name=. I don't know how many fields or the fields name of PersonInformationDataTable in advance. With a SQL Query, i could write a string with a loop on CityInformationDataTable columns and have a custom select string like : "Select Name,
I'm using LINQ to Entities to generate typed result sets in VB.Net. I've got a generic Report class as follows:
Public Class Report Public Property Name As String Public Property SQL As String Public Property Type As String End Class
Then in the calling scope I want to have code that does something like:
' create my data context Dim context As New MyAppEntities ' get a report object out of a dropdown list
[Code]....
So far I'm finding that .Net won't let me set the type in the (Of Type) clause on the fly at runtime.
Does anyone know how to do this?
I've tried changing the Type property of the Report class to an object of type Type, but that doesn't work either.
BTW, I know there are alternative ways to accomplish the same thing, but I'm working with external constraints that make this what I've got to work with right now.
I'm using a select statement to select data from an Access DB but I'm using. I can select the data perfectly but when I use the Where clause it doesn't select any data and the data I'm looking is in the DB.
I design a database in datbase.mdb which have a table name Fuel.The primary key Column Name is ID which data type is AutoNumber (Long Integer)User select the ID number and i run he following statement but error occurEID= combo1.text.trim()userid= Convert.ToInt64(EID)Strsql= Select a1,a2 from Fuel where ID= 'userID'ERROR is Creteria DATA TYPE MISMATCH or No record foundPlease
I design a database in datbase.mdb which have a table name Fuel.The primary key Column Name is ID which data type is AutoNumber (Long Integer)User select the ID number and i run the following statement but error occur
EID= combo1.text.trim() userid= Convert.ToInt64(EID) Strsql= Select a1,a2 from Fuel where ID= 'userID'
ERROR is Creteria DATA TYPE MISMATCH or No record found?how i pass the where clause creteria if number datatype?and In accesss i read AutoNumber is Long Integer i also convert into INT64 but error is still there.
I have a month and a year dropdownlist which give me the following string 01/2012 The date format in my db is "2012-01-01 00:00:00" but when I select an individual date and put it in a message box it converts to "01/01/2012"
I've altered my select statement below to reflect the converted date. However Im still not given the correct details. Any ideas? Is there a particular format that I need to use when dealing with a timestamp field? Can I even use the "Right" function in a select statement?
Dim newRecordDate As String = val1 & "/" & ComboBox2.SelectedValue Dim sql2 As String = "Select CatA, CatB, CatC, Cost, Currency, MarketingCode, Comment, RecordDate from vw_tblP_Usage_Details where puid = '" & puid & "' right(RecordDate, 7) = '" & newRecordDate & "'"
Dim groupedData = (From p In pData _ Group By p.TruncParam Into Group) _ .SelectMany(Function(g) g.Group) _ .Select(Function(d, idx) New With { _
[Code]...
When the TruncParam changes, I would like the index (idx) in the Select clause to reset to 1. So, in the list above, the Index should be SOLUB0001, SOLUB0002, INSOL0001, INSOL0002...CLRES0001, SUMCA0001, SUME0001.
I am using VS2010 windows application , SQL server 2008 express at backend.I am designing a windows form with fields to search records in database.Say there are 3 fields in the form :
1) material no 2) material group 3)creation date the corressponding table in database with above fields is " Material_master" User can search materials in the database by entering any of the above fields.No I want to write a query where if user doesn't enter anything then my query should work like
"select * from materialmaster "
if only material no is enterd at screen then
"select * from materialmaster where MatNo = materialno "
if both date of creation and material no enterd then
" select * from materialmaster where MatNo = materialno and Date = creationdate "
In other words , field with no values in it should not be accounted in the where clause. Only one query I want to write.How we can achieve this in VB.net windows application?
I have a LINQ to sql statement that joins 2 tables. I would like to add a order by clause on one of the columns. However the order by clause does not seem to take effect at all. right syntax in VB.net to achieve order by in the following:
Dim query = From dtIt In dbsomecontext.mytable Join dtIl In dbsomecontext.anothertable On dtIt.ItemID Equals dtIl.ItemID Where dtIl.IsAvailable = True Order By dtIt.manufacturer
how to select only records from Excel that meet a certain criteria? For example, this works:
Dim daExcelData As New OleDbDataAdapter Dim cnExcelData As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & txtInputFileAcc.Text & ";Extended Properties=Excel 8.0;") cnExcelData.Open()
Dim executeB As Boolean Select Case myVariable Case "a" 'some code Case "b" 'some code Case Else End Select
If myVariable is "a", control will go into the first case statement. Now let's say if myVariable = "a", but inside a's case block, I find that executeB is true, is it then possible to jump to the second case?
I'm building a dynamic query in my ASP.NET MVC project by the following: [code]Where basically the strWhere is a string that I build up a dynamic filter depending on what the user selects to search on.This works great until I need to add a date comparison to the date clause.[code]Which will end up as:"SELECT VALUE userInfos FROM MyDBEntities.UserInformations AS userInfos Where userInfos.BirthDate <= 10/09/1992"..But when i try to execute the query with the ToList whenever a date is in the where string i get the following error:The argument types 'Edm.DateTime' and 'Edm.Int32' are incompatible for this operation. Near WHERE predicate, line 1, column 103.
I am trying to read data from an excel sheet but there is an exception saying that no value given for one or more required parameters which I don't understand. Here is my code upto where the error is pointing to:
Dim MyConnection As System.Data.OleDb.OleDbConnection Dim DtSet As System.Data.DataSet Dim MyCommand As System.Data.OleDb.OleDbDataAdapter
[code]....
The exception points to that last line MyCommand.Fill(DtSet) which shows me that there is a problem with my select statement. Previously my code reads the data and displays it without the where clause in the select but when I added the where statement so that it can only read data from rows where the column I has a value equal to 176, it instead gives an exception that shows that some required parameter is missing a value?
built rdlc report with report wizard, now i want to add columns dynamically to existing rdlc report instead of adding columns of drag them from the data source. i am using vb.net
I am trying to figure out how to do this or if it is even possible. I believe it should be, I have about 20 different tables with different amounts of columns in each table. I.E. One table might only have 4 columns while another might have 30 columns. What I am trying to do is create 1 sub/funtion that will handle the select and import for all 20 different tables, unfortunately for me I can't seem to figure out how to write this.
I know the select statement for getting the column names is :
SELECT column_name FROM INFORMATION_SCHEMA.Columns where TABLE_NAME = 'table'
I need to resize Rows and columns dynamically in TableLayoutpanel..I achive this but it's not perfectly come in some times.. My requirement is how we are resize the rows and columns of TableLayoutpanel at design time..Same like i need to implement at Runtime.If i resize any row or column only That perticuler item only resizing ..
Public Function buildBasicLabel(ByVal labelName As Label, ByVal text As String, ByVal font As Font, ByVal align As Integer) Dim tmpLabel
[Code]....
For some reason, the label is not lining up with the others once I span it. I'm trying to span it to get all the text to show but once I do, it starts pushing it over. I don't see anywhere where I restrict the size so that shouldn't be the issue.
I tried doing all this in the design and it works just fine. Mimicking the designer code doesn't seem to fix it either unless I'm doing something seriously wrong...
Posting images for clarity. NOTE: The borders are just to show the label alignment and the text should read "Flat-Footed AC"
IMAGE 1: Spanning 1 column (doesn't show all text)
IMAGE 2: Spanning 3 columns (still doesn't show text and you can see it's starting to dis-align)
IMAGE 3: Spanning 6 columns (Still doesn't show text and greatly dis-aligned. It should at least show all the text)
Error Message Object reference not set to an instance of an object.
Dim intBoxNumber As Integer Dim rbl As RadioButtonList For Each drv IN dv intBoxNumber = drv("BoxNumber") rbl = DirectCast(FindControl("rblPageSandBox" & intBoxNumber), RadioButtonList) rbl.Items.FindByValue("intPageSandBox" & intBoxNumber).Selected = True Next
So I made a Listview with 3 columns, I also added a ContentMenuStrip on to it that will delete selected items. But the thing is that I can only select the first column.
How can I make it so I can actually select all my columns?
I created below, this function gets all values in each cell of excel, but i do have a problem with this because its taking minutes to display the text from each cell, is there a way that i could make a function or call a excel method or property to get all values in a worksheet and put it in a string so i could display it.. actually our main purpose is to store all data that we could get into the database for reference and search criteria.[code]...
I have this function that i created below, this function gets all values in each cell of excel, but i do have a problem with this because its taking minutes to display the text from each cell, is there a way that i could make a function or call a excel method or property to get all values in a worksheet and put it in a string so i could display it or store it in a single column in our database.. actually our main purpose is to store all data that we could get into the database for reference and search criteria.[code]...
I am coding a public sub routine that clears all textbox fields in a form. I want to call/reuse this sub routine everytime i want to clear all textfields in any form in my program.
I can create a collections of all textbox objects in a form and loop on each of them to clear their textfields.
My _PrefillWizard method actually works for all the controls on my page except for those which are dynamically populated. The CheckBoxLists are such because they are automatically generated based on selectable values in a table in my DB. I already have this control in my markup like so... how do I force this to load and be ready before running my other code?[code]...
how I can select a row and column dynamically in EF4? (VB).A bit like a map, I want to navigate through the data using x and y axis to pull out one fields value,SQL would look like this
SELECT " & MyColumbVariable & " FROM MyTable WHERE MyRow = " & MyVariable & "
There are plenty of SELECT (...) VALUES (...) statements and Parameters phrases to go with the VALUES. Those appear unhelpful to me as I have no form fields or datagrids and will be working with all the rows in a DataTable in a DataSet. Once started, this application will run to completion, writing as few as 10000 rows or as many as 250000 rows
My Task is to write out the contents of each specified DataColumn in the DataTable, one DataColumn at a time. The insert will also include the key columns and use the datetimestamp of the records as a criterion. Nulls in the specified columns are included.
My source is a DataTable, my target for the Insert is a "tall-skinny" table in an Access database. There is a smaller DataTable that is related to the source DataTable, if I was writing from within the AccDB I would use Joins. I have created a DataRelation, but have no idea how to use it in this context..
I have tried many different SQL statements but they all fail on Select. Here are snippets of the code:
'now, instantiate the specified DataTable from among the DataTables filled above strDDTableNm = CStr(rsDDTblNms.Fields("Table_Name").Value) Dim dtSrcTable As DataTable
