cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")
cn.Open()
''# codes
cn.Close()
I used V S 2010
The above is my code......u can see that it is Ms Access DataBase....(password protection)
How i can create a setup .....that can be easy to install other computer.........
Can i Create such a setup ???
First of all, this code you posted is wrong:
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")
cn.Open()
''# codes
cn.Close()
The reason it's wrong is because you're not guaranteed to close your database connections, eventually leading to a state where your database is not accessible to your application. This won't happen in your development testing, because such tests tend to be short-lived, but it will happen to your users, who tend the keep applications running over longer periods of time.
Now, I know you're thinking, "Yes, I am closing my connections. Don't you see the cn.Close()?" Yes, I see it. But that's not good enough. There are a few cases (exceptions are the big one) that can cause this code not to run. The correct way to write this code is like this:
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")
Try
cn.Open()
''# codes
Finally
cn.Close()
End Try
And there's a short-hand syntax in VB.Net that looks like this:
Using cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")
cn.Open()
''# codes
End Using ''# No need to call .Close() any more, the Using structure takes care of it
Now, on to the actual deployment question.
You need to add a setup project to the same solution that holds your application project. You should then be able to use the output of your main project as the package for the setup project and include your initial database file as a content resource. There is no need for anything else included in the setup project; Windows includes the Jet database engine used by access out of the box. You may want to spend some time making sure that the appropriate .Net framework runtime will be installed as a dependency if needed as well.
As Will pointed out including the .mdb file into your project is probably what you are looking for. You can do it in the project manager and then adjusting the properties so that the file is published to the application folder (Copy to Output Directory = Copy Always).
In the code, you should then refer to the database as
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & My.Application.Info.DirectoryPath & "\db2.mdb;**Jet OLEDB:Database Password=secret**")
since you don't know the installation path of your database on the client's computer.
On the other side you might want to make sure that you publish your application as a 32bits application since the Jet4.0 does not work for 64bits applications (see http://connect.microsoft.com/VisualStudio/feedback/details/123311/win-xp-x64-jet-v4-0)
For easy install on another computer, I recommend SQLite or SQL Server Compact. Configuration may also be more difficult with access than sqlite or mssql compact.
Beyond that, I would recommend deploying the application using ClickOnce. Documentation here.
I think that making the MDB file part of your project, and setting the right property for it to be copied into the application folder will do the trick.
On the other hand, you will have to make sure you set the MDAC 2.8 as one of your project dependencies so that your users are either informed or required to download and install it to their computers.
I do think you may deploy through ClickOnce, otherwise create a SetUp project, that is doable.
Related
I am building a Windows Winforms Desktop Application using VB.NET 6.0.5, Visual Basic, and Visual Studio Community 2022.
I used to connect to ACCDB File using Microsoft Access Database Engine.
It's working well in the development machine, but when I try to deploy to a fresh installation of a Windows 10 x64 machine; I have to let the setup download and install the ACE engine.
I want to reduce the prerequisites as much as possible, as the end-users already have to download and install the .NET 6 Runtime.
I found out that all versions of Windows come by default with Microsoft Access Driver (*.mdb) and I want to use that.
The driver location is: C:\Windows\SysWOW64\odbcad32.exe
I think if someone installed Office it might update the driver to a different Jet.OLEDB version.
So my question is:
How to check the current Jet.OLEDB driver's version and what would be the connection string?
My current connection string is:
Dim cStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Database.mdb;User ID=Admin;Password=123;"
But still, it's giving that Microsoft.Jet.OLEDB.4.0 Provider is not registered.
I know that ACE Engine and ACCDB work better but it's enough for me to use JET and MDB.
Please help!
Thank you
Update: 20/5/2022
Things that I tried but with no success:
I compiled the application to target x86 as it's said in many references that Jet.OLEDB doesn't support x64.
I tried Provider=Microsoft.Jet.OLEDB.10.0.
Well, if you wondering what the connection string should be?
Let VS build it for you.
(you don't want to hand code, or type in connection strings anyway - and you don't have to).
So, in setting for your VS project, then here:
So, let click on that [...] and build the connection using JET (as opposed to ACE).
However, your issue/problem is that NOW vs2022 is x64 bits (first version to be that way).
I'm running 2019, so it will STILL test and VERIFY a x32 bit connection. I suspect that vs2022 WILL NOT pass the "test" button, but you STILL can use it to build the conneciton.
So, in above, we start the connection wizard, - hit change for the defaulted sql server, and we now have this choice:
Ok, we selected Access, but what about JET vs ACE.
Well, click on advanced - this:
And now we can (get to) choose the provider.
this:
So, you can choose jet or ACE.
choosing jet, then we now back to here:
Now BECAUSE I am running vs2019, then my test connection WILL work!!! - for you, it probably will not. So, the test connection button for you - you can try it, but EVEN if it gives a fail message, your connection is still ok.
This:
Ok, at this point, we are done.
We now in code can use the above connection in our code. Say like this:
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Using conn As New OleDbConnection(My.Settings.TestJET)
Using cmdSQL As New OleDbCommand("SELECT * FROM tblHotels", conn)
conn.Open()
Dim rstData As New DataTable
rstData.Load(cmdSQL.ExecuteReader)
Dim strMSG As String =
"There are " & rstData.Rows.Count & " Hotels in the database " & vbCrLf &
"The first Hotel is " & rstData.Rows(0).Item("HotelName")
MsgBox(strMSG, MsgBoxStyle.Information, "Table info")
End Using
End Using
End Sub
And we get this:
Now, I suppose I could look at the connection string - but I never really do that - I always let the system build that for me.
I get this:
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\test\Rides_be.mdb
As you noted, MAKE sure your project is set to x32. However, since you running vs2022, then the connection builder should work, but you HAVE to run your project to test that connection, I don't think in vs2022, you can use "test" connection.
On the other hand, since most of office (and even Access ACE is x64 bits?). Then if you build a connection using x64 bit ACE, then your test connection button should work.
I am exploring methods to enable users to restore a database from within the project.
I have a project which I want to publish together with the database, so that users with no experience can use the program I have developed.
The code is written in VB script and I am able to publish the VB code, but am finding it difficult to include the database in the ClickOnce method.
I have been thinking that I could possibly copy the .bak file to the client's PC and then run a VB script that restores the database to the SQLserver that is installed in the ClickOnce install.
Has anyone ever done this?
I did find on the web something that looked promising, but it has been written for .NET framework 2.0 or 3.0 and I found that when I added System.Data.SqlClient 4.8.0 I got the following error:
Severity Code Description Project File Line Suppression State
Error Could not install package 'System.Data.SqlClient 4.8.0'. You are trying to install this package into a project that targets '.NETFramework,Version=v2.0', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.
The website where I got the code: http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=1433&lngWId=10
Please can anyone help?
VBScript, which would get run via wscript.exe is decades old technology
VB.NET, which would get compiled into a custom .exe or .dll, is 2005+ (not included in this is .net core which is the past few years but I've not touched it)
dim connectionString as string = "Provider=MSOLEDBSQL;Server=localhost;Database=myDataBase;Trusted_Connection=yes;"
dim connection as New OleDbConnection(connectionString)
Dim cmd As New OleDbCommand
Dim query As String = "RESTORE DATABASE AdventureWorks2012 FROM AdventureWorksBackups;"
Try
cmd.CommandText = query
cmd.ExecuteNonQuery()
Catch ex As Exception
MsgBox("something bad happened")
End Try
Reference bits
ExecuteNonQuery https://learn.microsoft.com/en-us/dotnet/api/system.data.oledb.oledbcommand.executenonquery?view=netframework-4.8
Restore database https://learn.microsoft.com/en-us/sql/t-sql/statements/restore-statements-transact-sql?view=sql-server-ver15
and if you're not using OLEDB, or need a different provider, then futz with connection string as needed but that's the general approach
I am using Visual Studios build-in DataSource functions, to work with my application and its database. Now I am facing one little problem; How do I change the database-server in the final project?
Obviously the end-users server name will not be the same as mine.
Also how can I change it at runtime? My application has functions to find the database-server itself, so it needs to be able to change the database server at runtime (Only at applcations start) .
Update 1:
Right now I am Changing my TableAdapter.Connection.ConnectionString with .Replace("My Local Server Name", "New Server Name") to change the Server. But I don't think that's the way it's supposed to be done.
If you want to change the connection string after deployment then you edit the config file by hand or you can do so in code if the current user is an administrator.
If you want to change the connection string for a table adapter at run time to something other than what's in the config file then you do indeed need to set the Connection.ConnectionString property. The most advisable way to do that is to use a connection string builder. For an Access database, that might look like this:
Dim builder As New OleDbConnectionStringBuilder(myTableAdapter.Connection.ConnectionString)
builder.DataSource = dataSourceName
myTableAdapter.Connection.ConnectionString = builder.ConnectionString
I need a database for a web project (and for off-line projects as well). The problem is I don't know where to start and googling returns more advanced stuff. Where do I start?
I already have Visual Studio 2010 and Visual Web Developer 2010 installed (both – the express version). I'm not sure I have what is needed for SQL (which, correct me if I'm wrong, is what I need for databases). In my start button I have two folders named "Microsoft SQL Server 2008" (one of them with an "R2" at the end). But my computer isn't a server, just a PC. Am I supposed to install something on my PC? If so – which of the two? (The one with the "R2" or the one without it)
All I need is to create a simple database so I can store and retrieve information easily instead of reading a text file....
well, you need SQL Server installed. Try searching your computer for it, you may have it installed. The easiest way is to run services.msc and look for SQL Server.
See here, I have 3 instances installed but just one running (INSTANCE2008 is the name I gave to it, you will probably have SQLEXPRESS or MSSQLSERVER):
If it is installed you will need SQL Server Management Studio to create your database. You will probably have it under:
once you access it, just connect to your server (usually called localhost), right click on the database folders and select "new database"
from that, it is really easy to create your DB, just follow the steps
Sounds like you have all the tools you need to get started, however you might also need SQL Management Studio as well.
But "How to start creating and using databases?" is sort of a broad question. If your question is really about application design, then you would start 'creating databases' when you've defined your model. Once your model is defined, then you can start creating the database.
If your question really is about creating and using databases, SQL Management Studio should get you on the right track. It's a point n' click way to creating databases, tables, stored procs, etc.
Using the database... hmmm. The easiest way is to integrate Microsoft's Enterprise Library 5. Again, point n' click interface to setting up the connection in your web.config (or app.config) and plenty of examples.
You can import the System.Data and System.Data.SqlClient library in your application, like
using System.Data;
using System.Data.SqlClient;
and research about the SqlConnection class.
about SQL Statements, the W3Schools has a good reference.
A simple method sample that has a connection
protected void connection()
{
using(SqlConnection conex = new SqlConnection("your_connection_string"))
{
SqlCommand comand = new SqlCommand();
comand.CommandText = "SELECT * FROM Table";
comand.CommandType = CommandType.Text;
comand.Connection = conex;
conex.Open();
comand.ExecuteNonQuery();
SqlDataAdapter da = new SqlDataAdapter(comand);
DataTable dt = new DataTable();
da.fill(dt);
}
}
You will be having your database on your server. You can directly connect to that database with just a slight configuration in web.config.
OR
If you found "SQL Server Management Studio" in your Microsoft SQL Server 2008 R2 click on it and login to the sql server / express instance of the sql server.
Create the database there.
probably this is a simple question but because i have never used resources like that i can not think how should i do it.
I am writing a very simple program that connects to a accdb file (Microsoft Access 2007 file) and returns some results in a datagridview. Everything is fine. Now because we have to deploy this program in many computers i publish it so everyone we want can install it and have updates. What i wanted to do is to make the database file part of the program which i did it by adding it to the resources. My problem is that i do not know what connection string to enter in order to access it in my resources.
My previous connectionstring before i deploy it was this
ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\bl.accdb;Persist Security Info=True
What should i change in the data source in order to access the same file in my resources? Or am i wrong and this is not possible?
Thanks
You can do it. All you need to do is point the datasource to the location of the resources direcory, which by default is adjacent to the application itself. You could determine this at runtime by using:
Application.StartupPath & "\Resources\DatabaseName.accdb"