Build A Dynamic SQL Query String In .NET?
Jun 12, 2009
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.
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Jul 8, 2011
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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Jan 4, 2011
Can 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.
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Mar 1, 2006
I am trying to send a query to a device over http with the url:
[code...]
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.
[code...]
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.
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Feb 5, 2010
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:
[Code]....
but the "Qry", and the number of comboboxes, and their field names would change every time.
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Nov 10, 2010
For comparison: something like the shirt builder application at [URL]Say, if I have fabric image and want to generate base, collar, cuff etc. How should I do it on server side in .NET, and generate different components of shirt.
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Jun 19, 2010
Is there any free tool available that can be used to build Active Directry query also can i execute active directry query through c# code because while connecting to active directory through object model and iterating through each property of the active directory specially when all the property is not requierd the performance cost is comming. What I want is to query Active Directory domain get some property value ans save it in the sharepoint list, I am using object model to do this but at the cost of the performance. I am thinking to execute the query through C# code same as any Active Diretory Query tool to pull the value and then save it into the list.
[Code]...
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Dec 29, 2010
In my program I have a combo box that the user selects a date from and a list view that the user selects an employee ID from. How do I properly design my database query string to use both the date selected and the employee ID selected? The date is stored in a variable called YearMonth and the employee ID is stored in a variable called EmpID.
Here is what I am trying to do with my query:
Dim ExactQuery As String = _
"SELECT * " & _
"FROM[JobTypeExact_Query] WHERE (EMPID = ?) AND WHERE (YEARMONTH = YM)" 'Define Exact job type query
[code]....
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Mar 14, 2011
I have been trying the following but it returns unexpected results:
Dim xd As XDocument = _
<?xml version="1.0" encoding="utf-8"?>
<root>
[code].....
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)?
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Mar 16, 2011
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
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Sep 19, 2011
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 &
"',
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Dec 29, 2011
What I am about to do build is a UI that will allow a power user to build complex queries.
This is non-trivial, but very common. So before I re-invent the wheel, I would like to see if anybody can point me to some already-written free code or release some of their own.
Required:
To be able to specify some 'where-clause' type logic like this: Age>21 and (Citizen=True or HasGreeCard=True) but without having to type the query code, instead, use a UI with constrained options and on-the-fly syntax checking (e.g., no unclosed parenthesis or ending a term with an Operator).
I've seen this type of thing in many line-of-business apps, where you can say 'add condition' and another line appears on the UI like this:
Dropdown of fields Dropdown of ops (=, >, etc) Blank box for entry
And you can add more lines, and the lines are all and'ed, but you can also decide to OR a few, or insert parenthesis (explicity or via indenting), NOT a line, insert, delete, and move lines around, etc.
Not required but nice:
WPF - I could convert from winforms. Extensibility using OO constructs. Validate the sanity of the query. Emit a System.Linq.Expressions expression tree - or similar data structure. If it attempts to execute the query I don't need that; but I don't mind removing it.
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Mar 16, 2011
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.
[Code]...
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Apr 13, 2012
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.
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Apr 7, 2011
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)
[Code].....
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Aug 9, 2010
How do i great dynamic linq query in VB.net?
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May 10, 2012
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.
[Code]...
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May 17, 2011
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?
[Code]...
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May 17, 2011
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?
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Mar 16, 2009
I have an untyped dataset returned from my WebService. The user wants to dynamically construct a query referencing tables and columns and specifying values to test for.I have looked at Lambda Expressions and the Expressions.Expression Namespace. I think these provide the answer I'm looking for, but I'm not certain how to go about contructing the linq expressions to extract the datarows I'm looking for.
I plan on limiting the result to one datatable that the query will result in and i"ll provide the joins from the user's constructs.For a simple example I have a DataTable with (n) rows called "Table", and in it there is a computed column called "b_IsActive" that has the expression "Convert(IsActive, 'System.Boolean')". The user wants to retrieve all rows in "Table" where field "b_IsActive" is true.
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Jan 27, 2009
trying to write a dynamic sql query that fetches data from oracle 10g database. My Where criteria is giving me real problems but i guess it has to do with the oracle data format. The data column is a TIMESTAMP data type storing values like 25-JAN-09 07.06.01.000000000 AM. Am trying to get rows having the columns matching a specific date( ignoring the time values), my where looks like this
WHERE to_date(COMPLY_RUN_DASHBOARD_DATE,'DD-MON-RR')='" & Now.Date & "'"i get the following error :CheckError ORA-01830: date format picture ends before converting entire input string
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Feb 8, 2011
Is there a way to use Meta Tales or Table names to Construct a dynamic query in LINQ?
foreach (var metaTable in db.Mapping.GetTables())
{
var queryType = metaTable.RowType.Type;
[code]....
Is there a way to do something like this? The attempt above yields the error:Could not find an implementation of the query pattern for source type 'System.Data.Linq.ITable'. 'Select' not found. Consider explicitly specifying the type of the range variable 'q'.
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Jun 7, 2011
I'm trying to query old Access database tables and compare them with SQL Server tables.They often don't have primary keys, or they have extra fields that had some purpose in the nineties, etc., or the new tables have new fields, etc.I need to find records - based on a set of fields specified at runtime - that are in one table but not another.So, I do this kind of query all the time in SQL, when I'm comparing data in different tables:
dim fields_i_care_about as string = "field1, field2, field3"
'This kind of thing gets set by a caller, can be any number of fields, depends on the
'table
dim s as string= ""
[code]....
It tells me it can't convert a Boolean - Is there any way to do this without Linq expressions? They seem far more complex than what I'm trying to do here, and they take a lot of code, and also I can't seem to find examples of Expressions where we're comparing two fields in a subquery.Is there a simpler way? I know I could do the usual EXISTS query using JOIN or IN - in this case I don't need the query to be super fast or anything. And I don't need to use a DataTable or DataSet - I can put the data in some other kind of object.
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Mar 22, 2012
Say I have a string LineOfText = "UserName1 Password1 UserName2 Password2" how would I just grab the last word (Password2)
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Mar 21, 2012
I have users check off lab facilities in a UI. I want to use linq to fetch corresponding records for all of the labs that they have checked off. Basically,
Dim myRecs = (From l As EpiData In myDataContext.EPIDatas Where l.facility= _
one of the checked labs
So basically, I need to write a linq query where the "strings" to match are determined at runtime. Is there any way to do this easily? I know that there is a library out there called dynamic LINQ, but (1) it's in C# and I'm writing in VB (2) I'm really just looking for a single, simple solution for this single case.
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Jul 18, 2012
i am having real issues trying to build a sql string
Dim SelectQry = "SELECT * FROM TblSupplierQuotes where TenderNo='" & Me.txtTenderRef.Text & "' AND KMBPartNo=" & " " & Me.lbKMBPartNo.Text & " "
in SQL the TenderNo is varchar(50) = L003141T75-2012JANTEN
KMBPartNO is text = 442 019 115 1
when i run this command i get the error Incorrect syntax near '019'.
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Jul 16, 2009
Send me Code for Connection string for VB.net 2005 and SQL server 2000
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Oct 26, 2011
I need to read an xml file, and then build windows folders from it.How can I recursively keep track of the starting point of each node to know how to grab the string properly for the folder name?I have the following xml, and wish to get strings such as the following (to build folders):
FolderA
FolderAFolderB
FolderAFolderBFolderC
[code].....
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Oct 8, 2009
I'm building flat file content from collections of strings.
Example collection: A, B, C, D, E, etc.
I want to be able to output these values to a string with line feeds in one swoop with Linq if possible.[cod]e...
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Jan 9, 2011
I would like to output the complete windows build string(for example 6.1.7600.16385.090713-1255) into a label. What do I need to write?
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