I want to extract a field (field name is variant, i.e. depend on what the user's choice) from a table using sql statement. How do I do that? Do I have to declare some variables?
View 4 RepliesI am building a data based application using VB 2008 an SQL Express. I need to create textboxes on my form using code, (With & End With) method. I need a simple code string that will allow the app to check if the field to wich the textbox wil be databound is Nul, If so the textbox will not be created.
View 8 RepliesI am creating a database in VB.NET for a movie rental place. I currently have three forms;
Member Information
DVD Information
Borrow DVDs
What I would like to do is when I am viewing a member's details, if I click a button 'Borrow DVD for Member', the member's ID number transfers over to the Borrow DVDs table in the Member ID which also would hold some information from the DVD Information table, but I'm sure if i can figure out how to do this firstly, I will be able to apply the same rule and work it out myself.I have been trying to use a query statement like;
INSERT INTO [Borrow DVDs].[Member ID] [IN goodstuffvideos.mdb]
SELECT [Member Information].[Member ID]
FROM [Member Information]
but that has been coming up with error codes and completely not working.
Borrow DVDs table fields are: Borrow ID, Member ID, DVD ID Number, Hiring Fee, Borrowing Limit?
DVD Information table fields are: DVD ID Number, Title, Rating, Hiring Fee, Borrowing Limit Member?
Information table fields are: Member ID, Family Name, Given Name, Address, Town/Suburb, Postcode?
The error coming up is; Error in INSERT statement. Unable to parse query text.And under that it says The query cannot be represented graphically in the Diagram and Criteria Pane.
I currently have this working already for one of my combo box's, but when i try to use the same code i get this error ''There is no row at position 6.'' . The are 2 fields in the table asset_type_id, asset_type_name', im trying to dispaly the values in a combo box for the field 'asset_type_name.
the code for ' Friend Sub RetrieveCustomerInformation2()' works but the other friend sub throws the error.
Imports System.Data.SqlClient
Imports System.Data
Imports System
Imports System.Data.OleDb
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I have a query that I have to run that requires me to get rows from a table based on the value of a field in another table (which I have gotten earlier). I currently have it done like this (simplified).
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I have two tables Employees and CafeLogs. Some employees can be cashiers and also customers at the Cafe shop.
Table structures:
Employees: EmployeeId(PK) , FirstName, LastName
CafeLogs: LogId (PK), CashierId, EmployeeId, Value, => CashierId and EmployeeId are the data from column EmployeeId of Empoyee table
Table relationship:
Employees 1:N CafeLogs (CashierId (FK))
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Right now I know how to select only LogId, Employee's name, and , Value, not with Cashier name yet.
Dim query = From log In db.CafeLogs _
Join emp In db.Employees On emp.EmployeeId Equals log.EmployeeId _
Select log.LogId, emp.FirsName, emp.LastName, log.Value
How can i select all the entries from a field?
e.g. here's the database:
| Username=Password |
| Nick=23123|
| John=asdf|
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im trying to gather information from 3 tables at once
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to do this : Select previous field based on previous field in sql. I had tried a lot of ways but it seems doesn't works.
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i two tables named tblaccess(nID,nRoleID,nModuleID,cAccess) andtblmodule(nModuleID,cModuleName) and i have a datagrid which is bounded to tblaccess. the problem is, I want to display cModuleName from tblmodule instead of nModuleID. please tell me how.
View 1 RepliesI have a database and I wanna select a field ..I usually do this with access:
dim chosen as string
chosen = textbox1.text
Dim querysql = "select * from table where field = " & chosen & ""
But with SQL it doesnt work =S I really need to make this work .
I've got a table that caches calculated values for certain dates. I want to use LINQ to select all rows where the calculated value fields are null.But when I use isNothing I get an error that LINQ can't translate this into T-SQL. Is there a way to select null values with link, like this...?
Dim var = From rec As Record In myDataContext.Records Where IsNothing(rec.calculatedValue) Select rec
Other posts on stackoverflow mostly discuss how to avoid or check for null values with LINQ.
Note: I can't just set cacluatedValue's default to -1 to flag records whose calculated value has not been set (and then select those records) because I run queries that sum/average the calculated values. Selecting nulls seems cleaner and less bug-prone.
Select All Text In A Form Field On tab in vb
View 4 RepliesI need this for displaying in my crystal report here's my
cmd.CommandText = "Select * from pos where date= '" & datetimepicker1.text"'"
and nothing displays on my crystal report, I need the right query for that...the field value is DATE...I need the conversion for the 1/11/2001 format from date time picker to 2001-1-11 in DATE field
This is the only code I could find and it doesnt work:
Private Sub DataGridView1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles DataGridView1.MouseUp
Dim pt = New Point(e.X, e.Y)
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I am trying to pass a variable or find someway of displaying data in a datagrid that is based on a textbox.text field in a form.
I have a form that holds Customer details. I want to show relating data in a datgrid on the same form that will vary depending on what customer is selected.
This VS2008 Windows form.
Function "SetUserName" is used to download the specified user's name data to the appointed terminal.
[Format]
BOOL SetUserName(
long DeviceKind,
long dwMachineNumber,
long dwEnrollNumber,
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in the line dim n1,n2 as integer...is n1 actually being defined as a variant ?
View 2 RepliesI need this for displaying in my crystal report here's my code:
Code: cmd.CommandText = "Select * from pos where date= '" & datetimepicker1.text"'" and nothing displays on my crystal report, I need the right query for that...the field value is DATE...I need the conversion for the 1/11/2001 format from date time picker to 2001-1-11 in DATE field
I need to use .Select and filtering year on a date field,how can this be done,the next code give me error : the expression contains undefined function call year() vb.net For Each wRwTmp As DataRow In wTblC.Select("year(start_date)=" + wYear.ToString)Next
View 11 RepliesI just started using VS 2010. This product is supposed to be so much better than VS 2008 yet I'm noticing a couple of glaring things that are failures if you ask me.
1. When designing a Gridview, after having clicked on Edit Columns, in VS 2008 I could select the first field listed on the left side of the window, set a property--say headStyle-- and set the Horizontal Align to Left. Then if I clicked on the next field, that same property would still be selected on the right side of the window. In VS 2010, I have to go through finding the property and then expanding it and selecting it for each individual field. While it seems like a small thing, it's time consuming and kind of a pain. Is there some reason they couldn't have made it behave the same as in VS 2008?
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I'm having trouble using a COM based DLL in that one of the parameters is of type VARIANT.
The C++ definition of the structure is as follows:
typedef struct CSimData
{
DWORD dwSigId;
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From debugging i've been able to determine that the COM server is getting no value in vValue. Is there some sort of Marshaling that needs to be done to be able to set that VARIANT up on my side so that it can use it?
I have been tasked to convert out VB6 program to VB.NET. In my research online everyone seems to say I need to go through my code and get rid of any Variants I have. I have had pretty good luck so far, but I am having an issue in replacing this one.
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I am still pretty new to VB (either 6 or .net) and I am having a hard time finding an alternative for this. Will the convert tool in VB.net handle this just fine? Or do I need to change this? If I do, is there a better alternative for this? Forgive my noobness.
still having problems with mysql... im trying to find out how i can you a for each statement when getting data from mysql table...i have a table with IP and Port fields in... i want to get each and every one of the ip's and use it...for each ip in heat table and then run my "query()" function how can i do this in vb.net?... i can get ALL ips and ports and put in a gridview but would like to use the ip and display the Game Server Data that my query() function gets...this is from a while back when i made my Game Server Browser and just tryiong to make a better way of keeping my ip and port data and mysql seams to be the best way as its online and it can be added to and edited as and when needed and no one has to "redownload" anything?
View 3 RepliesIs it possible that i would only want to insert one field from a table into another table?
View 6 RepliesI have done plenty of VB programming using flat files etc... Now I am attempting to create a SQL database (I have my sql 2008 express box up and running) I can connect just fine, I made my database, made an account and made it data reader and data writer. I even gave dbowner to my user for testing. I created some tables, and I can access them through the dataset designer in VB 2010. Now what I have been trying to figure out all day.
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I want to retrieve a value from a field of a table. How can I assign this value in the text of a tooltip. The tooltip will appear when the user will move the mouse on a textbox.
View 1 RepliesI am creating a wrapper class in .NET (VB.NET as it happens but is equally related to C#) that is exposed to COM and one of the properties I am trying to wrap is a Variant. I thought I would just be able to use an Object, but I get an error: Public Property FieldValue([vFieldID As Object = -1]) As Object cannot be exposed to COM as a property 'Let'. You will not be able to assign non-object values (such as numbers or strings) to this property from Visual Basic 6.0 using a 'Let' statement.*
My property declaration looks like this:
Public Property FieldValue(Optional ByVal vFieldID As Object = -1) As Object
Get
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I have a simple problem and I believe that the solution is with module using but I could not resolve it yet. Here is the scene:In Form1 I have a variant that gets its value from the selections of a listbox. The code is:OPtext) in Form2 because this selection from Listbox (in Form 1) should also trigger some events in Form 2. I tried to use a module and declare the variant using Public. I did this and I now can use the variant in Form 2. But the value selected in Form1 does not come to Form 2.
View 7 RepliesHow can I call my TextBox ID = "txtFromAddress" data to a table that I am trying to send? Right now it is just showing the text '& txtFromAddress' on the table on the email that I send.
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