XML Database Changing Schema And Migrating Existing Data?
Aug 5, 2010
I have a purely XML database. It's stored as XML, there is no other database file. I did this by first creating a dataset in VB, then adding tables and relationships. I load the database by calling DataSet.ReadXml(FilePath), and save the database by calling DataSet.WriteXml(FilePath).
Now I need to make schema changes, but need to preserve existing data. How might I go about doing this? As soon as I load the database I loose all data if I change the schema in the dataset designer.
I have searched for changing database schema, but everything I find deals with real databases, not XML only ones, and the info doesn't apply because they are using db connections and then running sql against it and AFAIK XML databases have no way to "connect".
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Jul 18, 2011
I have this Add User Form and a Function Class, I need to know if the username typed in the Add User Form already exist in the database, so that I can warn to change the username but I have problems doing that.
Here's the code for the function class:
Public Function addUser(ByVal arole As String, ByVal ausername As String, ByVal apass As String, ByVal aname As String, ByVal aaddress As String, ByVal aregion As String, ByVal aprovince As String, ByVal atown As String, ByVal adate As Date, ByVal acreator As String) As Boolean
[Code].....
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Feb 17, 2011
I'm using vb.net 2010.I have a DataSet with a Table and data. MyDataSet1 which contains Table1 I want to create another table that is the same as the Table1 but without data, but it should have the columns, etc.
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Jul 16, 2009
I need to update a database app written in VB, Visual Studio 2003, using an Access Database.Currently: Customer has 4 users, local network. Access Database is 30MB, about 50 tables.Wanted: Customer is opening new offices, and wants to connect to the database via the internet. There will be 10-15 users.App background: I have all data access via OleDbDataAdapters and one OleDbDataConnection.There are 4 DataSets: Global, Lookup, Reports, FormSpecific.
I have one Private function: FillTable:
Private Function FillTable(ByVal TableToFill As DataTable, _
Optional ByVal OleDbAdpToUse As OleDb.OleDbDataAdapter = Nothing) As Integer
' fills the table by using OleDbDataAdapter.Fill(aTable)
[code]...
All is working well.What I Need to Do:I think I need to migrate the Access Database to MS SQL. What I Have:Visual Studio 2008 Professional. I have started the MS SQL walkthroughs. I did the �Create a Data Connection to the Northwind Database� walkthrough, and connected via MS SQL Server. I cannot find where I can modify the SQL Commands. If I convert my Access Database to a MS SQL Database then can I
1) Just update the OleDbConnection, so it connects to the MS SQL Database (not the Access database).
2) If I cannot do #1, what do I need to start with?
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Jun 3, 2009
I have a large project which consists of about 60 modules. It contains a lot of DataGridView components.
Recently I implemented cut-copy-paste functionality to one of the DataGridViews.
What is the best way to add same functionalities to all the other DataGridViews .
P.S. I don't want to create a new component which inherits DataGridView and re-define all the DataGridViews.
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Jan 22, 2010
I am having a problem when changing data (or altering data in a feild)I have the error message for a better explaination of the problem
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Jan 10, 2012
I am working on application to migrate DBF file data to SQL.
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Jun 27, 2012
I have a php web service that I can call from a php client. I need to call this web service from a vb.net application. When I try to add a reference to this web service I get this error:The root element of a W3C XML Schema should be <schema>here is the top of my wsdl file:
<?xml version="1.0"?>
<!-- partie 1 : Definitions -->
<definitions name="raidService"
[code].....
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Jul 27, 2011
I am using microsoft access 2003 and visualbasic.net. I am trying desperately to add a database using the wizard, and it lets me go through with it, testing the connection is good, but when I try to finish it gives me an error: "<customers>Could not retrieve schema information for table or view customers." What am I doing wrong? I've added databases in the past without this problem using the same Access.
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May 16, 2012
There is an old timesheet application being used in my company and i am going to rewrite it in asp.net.There are other tables which can be linked to new Timesheet table like employee table but my main concern here is the Project and Project_Activity table.In the current system, there is a one project and a activity table which are linked to the timesheet table seperatly and user has to spend alot of time on selecting activities code they worked on for specific project.I have came up with the new idea; Project manager will have to fill up a project template and link all the activities code with the one project before starting this project. This way user will have to select the project only and it will automatically bring the associate codes for them.I like to know if this design will work okay? and is it okay to link Project_Activity table with timesheet? [code]
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Aug 2, 2011
I have an Excel template that contains numerous pre-defined charts and a program that opens this template and collects data used to populate the charts. This works great but I now want to adjust the series length so that the charts only used the data collected (not a range of 32000). I'm trying to iterate through the charts and determine the range for each series of each chart but not having much luck. The snippet below allows me to see the xvalues but does not return any information as to where this data is located. Does anyone know how to extract the range for each series in a chart?
[Code]...
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Mar 23, 2012
I wrote an import procedure that extracts certain row data from Excel files. Currently, I manually create a DataTable in VB.NET, add columns and their datatypes. don't add anyconstraintsto the table, but the SQL database table where this data is going to does haveonstraintssuch as a column can't be null, check constraintsor unique constraints.Here is a simple example of my code.
Dim dt As New DataTable
With dt
.Add("Column1", Type.GetType("System.String"))
[code].....
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Sep 16, 2010
I am migrating a project from VS2008 to VS2010 (Framework 4)and I keep getting the following error when trying to use databinding with a child property in VB2010.
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Mar 6, 2012
If you know a bit about database design, you would mind glancing at this? I don't know if I my logic is right or not.Schools, players, and coaches can have awards. Schools have players and coaches, states have schools. - Am I missing something?As far as populating the database, I want to have static data entered into the database before a user runs the program and then allow them to add new information that would only be saved (to a save file, not overwriting the original static data) if they clicked a button. How do I go about this
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Nov 17, 2010
I'm building a vb.net application that composes messages for later message queueing in accordance with a predefined schema that an observer of the message queue requires.I've made the XSD file for the schema already, but I was wondering if there was any way to import the schema as or convert it to a custom object type in my .net application, where the elements of the schema would represent data fields or sub-objects to be filled programmatically.
Is there any way to do this?Am I getting my terminology correct here, or would there be a better way to accomplish what I'm attempting to do?I'd like to be able to create a schema and use it as a definition for some kind of data transfer object in my applications, without having to make the object as a separate VB class file.
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Jan 19, 2012
The new command text returns data with schema different from the schema of the main query. Check your query's command text if this is not desired. I am getting this warning, whenever I add a query in a Strongly Typed DataSet which returns a single column.
Ex
SELECT DISTINCT Building
FROM Room
ORDER BY Building
When I give this query it will show me a warning. Because warning leads to a constraint error when ever i call the same function in a windows form.
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May 8, 2012
We are thinking about changing our current database system, MS Access 2007 front end and MS SQL Server 2005 backend to using a higher level language such as Visual Basic .Net. I wonder if this is the BEST solution for data management? Currently, among others, we have two big database programs that handle more than two hundred users and it's crashed often. That's the reason we think about changing to something that can handle these database programs effectively preferably using MS technology such as .Net.
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Aug 3, 2011
i have been coding for years, but never integrated XML. So I guess I'm a newbie. I have inserted an XSD file in my project, ARequest.xsd. I created a folder in my project called XML just to organize things, so this file ARequest.xsd, is in this folder.
Now I have a form that displays data from a database that has the same fields that are in this XSD file. Can I load the XSD file into my Windows Form, load the elements from the data on the windows form and then create an XML file then send it? If so how? Any code snippets would be helpful. Now I do know how to create the XML file, we'll call it Test as
[Code]...
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Jan 8, 2011
I am having a problem with my program that is desinged to read a 3rd party text file database. I posted previosuly about a problem inserting an item in a new row and the column was expectig a different data type. It appears that sometimes the column is being determined to be of decimal value, I dont understand why. the fields contain information such as
Col1
F123456
CLW-12321 etc....
So my column fills with
123456
12321 the letters just get chopped off
So I added MaxScanRows = 0 to my schema file and that took care of the problem
Except now several of my columns that contain Date Values are coming back
9/24/2010 00:00:00
without the setting MaxScanRows = 0
The date returned 9/24/2010
Here is the code for my schema ini file I am creating:
HTML
Dim fs As New FileStream("Schema.ini", FileMode.Create, FileAccess.Write)
Dim writer As New StreamWriter(fs)
[CODE]............
I have been trying different settings hence the dimmed out lines
Here is the code to fill the datatable:
HTML
[CODE].............
I am thinking that without the MaxScanRows = 0 setting the datatype for Col1 is being incorrectly determined
I am not sure what is happening with other columns that contain date values. Apparently If i use MaxScan Rows=0 all columns are being pulled over as string value which creates numerous problems. If I dont use maxscanrows then all columns appear to be correct except Col21 MLSNUM which is being pulled in as a decimal. Can I change that in the schema file?
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Mar 1, 2010
I need to create unit testing project for my current website. The currentw ebsite si written in VB. All unit testing examples are using interface to create mock object. My current VB class does not implment any interface. Can I add interface and implement it to my current class and functions without affecting or changing codes to any pages in my website that call the functions? For examples my current class is like:
[Code]...
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Dec 5, 2011
make objects from the ToolBox using code instead of changing existing objects invisible then visible later?
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Jul 28, 2009
just wondering if it is possible to add a method to all forms in my project without having to do it on one form and Inherit all my other forms from that one
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Aug 5, 2011
I have a workbook (Workbook1) that runs through some steps using visual basic, which ends up opening another workbook Workbook2). Once Workbook 2 is opened, I need to copy a section of data from it, into Workbook1 int a specific worksheet. I was able to do this by recording a macro, but the challange is, the name of Workbook 1, and Workbook 2, will vary by User. When I created the macro it uses the files as they are currently named. The section of code is below.
[Code]...
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Oct 12, 2011
I'm creating another database searcher, only this one is a little better user friendly than the one I made with a datagridview. I'm using the "details" of my dataset(CustomersDataSet) and trying to add a record into an existing database. I'm using this code
Me.TableAdapterManager.UpdateAll(Me.DatabaseDataSet)
which worked for me when using the datagridview, but for some reason it won't work now. Even when I check for my test "add a customer" in the access database itself, it isn't added.
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May 26, 2008
I am using SQL server managment express. I have 4 databases in it and got a bug on my computer which I could not get rid of. I saved these to disk and reinstalled windows, I reinstalled SQL server and I am now trying to add my 4 databases. Can any one help me with this, I can add a new database but not an existing.
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May 23, 2010
I need to add a column to an existing table in my database. I am having trouble adding a column to my database. I physically go into Microsoft Access and add the column, my problem comes up when Visual Studio does not recognize the table. Basically, I think I'm doing something wrong.
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Feb 15, 2012
i am using vb.net2010 and mssql as my database. what i want to do is when i open the form, the database will auto increment the student id and show it on the text box.
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Feb 1, 2011
I am working on a database application for my Class Reunion in VB.et and VS 2008, My problem is when i build the program it will only work with 1 Database For my Class year, I would like the ability to be able to create a new database for a different classyear than the 1 i build and pre-Populate, so the person using it can do more than 1 year and keep the databases seperate.
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Mar 22, 2010
How to get the value of table in sql database and adding in existing table?
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Jun 19, 2010
I'd followed Beth's video which nicely explains how to setup a "connector" to an existing database. Also, I've updated a method to retrieve information from one of the tables.Now, I need to retrieve information from the table, but I don't succeed to find the "method" to do so (I don't get to the situation that "Fill" or "GetData" are recognized methods). Could anyone send me references through which I could easily understand. how this needs to be done?
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