I'm currently trying to loop through an array (two values) and use both values in a query inside the loop Right now my code doesn't work. I'm trying to populate dynamically the "appType" parameter within the "SelectParameters" tags of the SQLDataSource, but this won't work.
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I'm need to do the equivalent of a t-sql statement like this using LINQ:
SELECT * FROM mytable WHERE idnumber IN('1', '2', '3')
so in LINQ I have:
Dim _Values as String = "1, 2, 3"
Dim _Query = (From m In mytable Where idnumber = _Values Select m).ToList()
Not sure what to do with _Values to make idnumber evaluate each value in the string.
I have the following linq query:
Dim q = From definition In definitionList _
Where definition.ValueDefName.Contains(criteria)[code]....
I have already looked into this answer: LINQ - dynamic WHERE clause?Unfortunately, it doesn't work for me using .net 4.0. When I attempt to pass the criteria string in it ask for a predicate. The end goal is to add any of these:
definition.ValueDefname.Contains(criteria)
definition.ValueDefDesc.Contains(criteria)
definition.Aliaslist.Contains(Criteria)
definition.StrategicInitiative.Contains(Criteria)
to be passed into the query depending on what checkboxes the user has selected. How can I create a dynamic where clause in linq to sql? Is there new syntax for passing in a where clause as a string?
I would like to bind a DataGridView to a different LINQ query every time (in order to reuse the same form/DGV for different queries), like this:
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but the "Qry", and the number of comboboxes, and their field names would change every time.
I am learning how to use database. I am using sql server 2005. I would like to know how to make an sql query to the database from vb.net. I have tried some code. what i would like to know is, how to make the sqldataadapter statement with 2 or more where clause.
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I have an application that does a search of our database (exposed via EF) for records meeting certain conditions. We have two main tables (Jobs and Recipients). Recipients are linked to the Jobs table by a Job ID.The job record has various fields (Process Date, NameJobType). The recipient has a lot of Name and ID fields (e.g. Account Number, Surname, etc)
View 1 RepliesI have a table DailyTransaction in MsAccess as under: DTDate, DTTime, CustId, Description, Quantity, Price, Amount, AccountNumber, Name I want to extend following query with a Group By clause:I require to display all records in a Listview Group By CustId.Then I require to display all records in a Listview Group By AccountName.e how I can extend following query with Group By clause to achieve the required results
View 4 RepliesHow should I create between clause in my query?
View 3 RepliesI have an application that does a search of our database (exposed via EF) for records meeting certain conditions. We have two main tables (Jobs and Recipients). Recipients are linked to the Jobs table by a Job ID.The job record has various fields (Process Date, Name, JobType). The recipient has a lot of Name and ID fields (e.g. Account Number, Surname, etc)I want to present a search screen where they see a list of fields to search on. The ASP.net code then sees which textboxes the user typed in (or selected), and builds a query based on that. [code] Where I'm stuck is figuring out how to add in additional where clauses. Should I just use Entity SQL?Can this return strongly typed EF objects as well? And is it possible to return both the Jobs and Recipients objects?
View 1 RepliesI've written an SQL query with a lot of 'or's in the 'where' clause: i.e. "SELECT * FROM myTable WHERE col1='a' or col1='b' or col1='c'...etc" I'm trying to run a query in access via vb.net, but I keep getting "Query is too complex" error message. I'm guessing I've hit some maximum limit. Anyone know a way around this, other than just to break it down into multiple queries?
View 5 RepliesI want to set data binding source filter. I want to show only 10 results in descending order by date column.
I know how to use TOP clause in ordinary 'sql' query, but I don't know how to set up filter to binding source.
Dim dataContext As New ACSLostFoundEntities()
Dim query = From s In dataContext.FosterForms() _
Join c In dataContext.Fosters() _
On c.License Equals s.License _[code]....
At the end of this I want to do a Where WantedPets.Contains(criteria), is this possible?
Whats wrong with the below query, I am getting this error: Nullable object must have a value.
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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'm adding queries to a wizard generated Table Adapter with WHERE condition that involes the "%" wildcard:
SELECT * FROM Customers WHERE Country = @Country AND CustomerID LIKE @CustomerID
--If I add % after @CustomerID, I get an error message that the --query can't be parsed but if I run the query as above it returns all --the rolls irrespective the value I supplied for the CustomerID column.Only performance counts!
I've got two tables:
tClient:
ClientID Name=============1 John2 Sally3 Joe4 Nick
tInvoice:
InvoiceID ClientID DateAdded==========================1 1 2010/09/012 1 2010/09/023 3 2010/09/01
I'm trying to write sproc where I need the following info:
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I built a prototype system with some database queries. Since it was just a prototype and I was very new to databases, I just used a direct string. This is the string I used and it works fine:
command = New OleDbCommand("SELECT * FROM " + prefix + "CanonicForms WHERE Type=1 AND Canonic_Form='" + item + "'", dictionary_connection)
Now, in putting it in a real system, I wanted to use the more secure parametized method, so after some googling I came up with this:
command = New OleDbCommand("SELECT * FROM @prefix WHERE Type=1 AND Canonic_Form=@form", dictionary_connection)
command.Parameters.AddWithValue("@prefix", prefix + "CanonicForms")
command.Parameters.AddWithValue("@form", item)
But all I get is an error for an incomplete query clause. What have I done differently between the two?
I want to pass a comma delemited list of values as a parameter to a query I'm building using the designer in Visual Studio 2008 based on some strongly typed DAL tutorials I was going through. The query is going against a DB2 database. Here's what I want to do:
select * from prices where customer in(?)
It works fine win I pass in 123456 as ?But fails when I pass in '123456' (it is a char field so I don't know why this doesn't work; it must be adding these behind the scenes) or 123456, 123457 or '123456', '123457' I'm adding this page to a portal where all the data access is being done based on the DAL designer model with a BLL that calls it so I wanted to do it this way for consistency.
I have been trying the following but it returns unexpected results:
Dim xd As XDocument = _
<?xml version="1.0" encoding="utf-8"?>
<root>
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The above result returns both 'element' nodes however it should only return the first where element/subelement@id=1/subsubelement@id=3 However if results.Ancestors. is used it returns the correct 'subelement' and if that line is not included it returns a single 'subsubelement' whih is also correct I don't understand why when mvoing to the 'element' it returns both (I realise both have a subelement with id=1 but I thought each further query would filter out the presvious results)?
I want to write a query that the "where" in the query is a string something like"
Dim query as string= "Name =xxxx and Date > 10 "
Dim t = from book in doc.Descendants("books") Select _
[Name] = book..value, [Date] = book..value....
Where (query)
I build the query string on run time
I have a sql query that set data to a dynamic text box. Can some one explain how i have to make this query
"Update Clientgegevens set Clientnaam = '"
& TextBox("& T.ToString &").Text &
"',
Im currently working on a project to build an application for Windows Mobile 6.I have a SQL query string:
Dim connectionString2 As String = "Data source = " + path + "HC.sdf"
Dim cmdText2 = "SELECT * FROM BigC_Rangsit_0_"
I want to substitute the table name ie. BigC_Rangsit_0_ with a variable which contains the table name.say, during runtime the user selects a table from the dropdown list , that variable should be substituted with the selected table name dynamically in the SELECT statement.
Dim cmdText2 = "SELECT * FROM "selected table name VARiable""
well, I need the right syntax for this.
I have a listbox which users can select from a list if Towns, I want to be able to build a LINQ query based on the selected items in the list e.g.
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I'm triying to create a dynamic query to Entity FW (i'm using Self tracking Entities over EF)
This is what i'm doing:
Public Class Specification(Of TEntity As Class)
Private _predicado As Expression(Of Func(Of TEntity, Boolean))
Public Sub New(ByVal columna As String, ByVal condicion As OperadoresComparacion, ByVal valor As Object)
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How do i great dynamic linq query in VB.net?
View 3 RepliesCan we execute any string like "Button1.Text = Value"
Question arises from sql server where we can store a dynamic/static query in a string (varchar) and execute it and it will put the value to the button1.
Im working on a project that includes a TableAdapter for filling data. I usually use parameters for queries I create, but what would be the best way to create a query that may have a wildcard without creating a bunch of queries?
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I have a table called Foo and I have two columns: Lorem and Ipsum, so the scheme of the table is:
Foo(Lorem, IpsumID)
I also have a table called IpsumTypes, which looks like this:
IpsumTypes(IpsumID, IpsumName)
I would like to write a LINQ query which will have the following result:
Headers: Lorem, IpsumName1, IpsumName2, ..., IpsumNamen
Values: Loremi, count(IpsumName1), ..., count(IpsumNamen)
Each row represents a group of Lorem value and the number of each possible IpsumID in the group. New rows can be added to the IpsumTypes table, rows can be deleted too, so I need dynamically generated columns, because at the time of writing the code I'm not aware of the possible values of Ipsum. How can I achieve this? Is there a magical Linq query which solves this problem, or should I get the values from the database and parse them separately, if speed counts?
I am trying to send a query to a device over http with the url:
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What I want to do is retreive this xml file over http and save it with my VB.NET application. To do
that I am trying the following function, and it works to retreive the page source for normal web
sites, but it fails when trying to retreive this particular page.
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I think that the problem is that the code is counting own a present length in the header, which is
not the case for a dynamically created page. (i.e. you dont know the length until you are done) As
such, the code should be written to read the entire reply.
I wrote a function ReadXML().This function reads XML file and returns a string.The string contains all the XML file nodes values to duild SQL query dynamically. Any way My code is working. Is this right way? Can you please suggest me the unnecessary code(loops...)in this function, So that I can do the code in a better way.[code]
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