I'm creating an in-house application and have always hardcoded the database connection string. However, this time I want to do something different and give the users the ability to enter the information from the application.
I figured out that I can store the variables in the Application Settings and call them from code, but I can't figure out how to call them within the connection string.
Here's the code:
Dim dbConn As New MySqlConnection
dbConn.ConnectionString = "Server=172.43.96.271;Port=3306;Uid=someone;
Password=theirpassword;Database=thedb"
Hope I explained myself well?
You can simply concatenate the string together, or better yet, use the String.Format method:
dbConn.ConnectionString = String.Format("Server={0};Port={1};Uid={2};Password={3};Database={4}", My.Settings.Server, My.Settings.Port, My.Settings.Uid, My.Settings.Database)
If you were using MS SQL, I'd recommend using the SqlConnectionStringBuilder class to do it, but since you're using MySql, it doesn't really apply. You may be able to use it anyway, though.
You would have to use User Settings for this.
And, if you want the users to input the separate parts of the connection string (Server, Post, Username, Password and DB), you would have to create a settings entry for each of those, and then construct the connection string from those values.
Here's a good article for this: User Settings Applied
Related
I'm working in a legacy app for the moment, upgrading Access 2003 to link to SQL Server tables (2008 R2 or later). With tables linked by code, I can insert, but not update or delete. I've tried everything on the web, no dice. Details below.
Being terse so not tl;dr.
Tables first created using upsizing wizard. In use, app has to connect to different ones in same schema, so can't just set and forget. Can't do local DSN's, many installs, though DSN file is possible. But problems there too, DSN not found. Details later.
Before the rest: Soon I'm further updating this app to Access 2016 or so. If this is different enough / easier there, I'll wait a few days. Maybe someone could suggest the best refsite for that.
* problem details follow *
Using a DSN and the UI to link a table, I get an editable table. Hurray.
But when I use the code below (found on every refsite), link is made but only selecting and inserting work. Everything else fails fails fails, no matter what.
Public Function LinkToSqlTable(sqlInstance As String, sqlDb As String,
sqlTableName As String, localTableName As String)
Dim linked As New TableDef
' ***factored-out functionality, known to work: reader can ignore*** '
DeleteTable localTableName
' connection-string steps, placeholders replaced by args '
Dim sCnx As String
sCnx = "ODBC;Driver=SQL Server;Server=_instance_;" & _
"Database=_db_;Integrated Security=SSPI"
sCnx = Replace(sCnx, "_instance_", sqlInstance)
sCnx = Replace(sCnx, "_db_", sqlDb)
' linked-table steps '
Set linked = CurrentDb.CreateTableDef(localTableName)
linked.Connect = sCnx
linked.SourceTableName = sqlTableName
CurrentDb.TableDefs.Append linked
' ui '
RefreshDatabaseWindow
End Function
* ID column or permissions? *
I thought the problem was lack of identity column originally, I added one, but no change. At least now I have a PK field like I should. ;-)
When I manually link table, UI demands to know the ID column. So could it still be it? Fine, but how do I set that in code? Searches revealed nothing.
I assume then it's permissions as sites etc. say. I also took all the steps I could think of to fix that. No dice.
* things I've tried *
Aside from the ID-column stuff I said before, these things (not in order):
Since DSN saved as a file, tried using it as exampled, in cnx string. Fail.
Used DSN contents, carefully winnowed & translated, in cnx string. Fail.
Used connection string from the table that I had connected manually with DSN. Fail.
Changed driver in cnx string across all major options, even omitted it. Fail.
Changed security in cnx to Integrated Security=SSPI and other options, and omitted entirely. Fail.
I added my actual local user as exampled, with and without password. Fail.
(Previous few options tried across earlier options, though not 100% coverage.)
In SQL Server, using SSMS, I tried security power:
Added SQS-authentication login to the instance
Matching user to the default db seen here
Gave that login-user read and write permissions in db here (plus others, sometimes)
Added matching id & pw to the cnx string. Fail.
I tried setting up this db in SQS to have let-everyone-do-everything "security" temporarily. Fail.
This, that, and the other thing. Everything fail!!
So a permissions issue? Some way to use DSN file after all? Mismatched permission settings in my cnx string? Boneheaded oversight? Something else that I've missed? I'm pretty good at both SQL Server and Access, but only at a basic level in their security stuff and connection strings are the devil.
* retrieved table properties *
Just in case they help, I retrieved these (after objects added to TableDefs collection).
** This one, done in UI and with DSN and this-is-ID-field, worked with editing: **
Name = dbo_tblSendTo
Updatable = False
DateCreated = 4/19/2016 11:11:40 AM
LastUpdated = 4/19/2016 11:11:42 AM
Connect = ODBC;Description=SQL Server tables for TeleSales 5;DRIVER=SQL Server Native Client 10.0;SERVER=(local)\sqlexpress;Trusted_Connection=Yes;APP=Microsoft Office 2003;WSID=CMSERVER;DATABASE=TS5_General;
Attributes = 536870912
SourceTableName = dbo.tblSendTo
RecordCount = -1
ValidationRule =
ValidationText =
ConflictTable =
ReplicaFilter =
** And this one, from table linked via code, didn't: **
Name = tblSendTo
Updatable = False
DateCreated = 4/19/2016 11:17:51 AM
LastUpdated = 4/19/2016 11:17:51 AM
Connect = ODBC;Description=SQL Server tables for TeleSales 5;DRIVER=SQL Server Native Client
> 10.0;SERVER=(local)\sqlexpress;Trusted_Connection=Yes;APP=Microsoft Office 2003;WSID=CMSERVER;DATABASE=TS5_General;
Attributes = 536870912
SourceTableName = dbo.tblSendTo
RecordCount = -1
ValidationRule =
ValidationText =
ConflictTable =
ReplicaFilter =
* my plea *
So..... Please someone help me out. I don't like feeling stupid like this, and regrettably I need to do this instead of replacing it with .NET code or similar.
Thanks, anyone who can...
Ed.
Alas, I am able to answer my own question.
edited a little since first posted in reply to HansUp's comments
I had added an identity column to the table that I couldn't edit. However, I had not set it up as a primary key. It turns out that using identity doesn't make something a primary key automatically.
But the latter, making it primary key using either of the 2 possible DDL syntaxes, is crucial. Since I thought I had dealt with the no edits without unique key problem, I focused on permissions.
All of the permissions things here, then, are just a sideshow.
The upshot of this is to be sure to add an identity column and make it a primary key if for some reason your original table schema didn't have that.
If I have the time, I will be trimming the question to reflect what I've discovered.
Simply trying to find out the correct syntax for my connection string. Before anyone asks, yes I did look at other SO answers, and no they did not work for me. Here a couple of attempts I made from looking at other SO questions like the one I am asking
Server=(local);Database=SalesOrdersExample;Integrated Security= true
Data Source=(local);Database=SalesOrdersExample;Integrated Security=SSPI
Server=.\\SQLEXPRESS;Database=SalesOrdersExampleDataSet;Integrated Security=true
None of them worked (I have a Console.WriteLine("test"); thrown in there and it works up until I try conn.Open() (opening the connection to database) so I'm assuming that it must be my connection string since nothing gets written after conn.Open())
Console.WriteLine("test"); // works
SqlConnection conn = new SqlConnection("Server=.\\SQLEXPRESS;Database=SalesOrdersExampleDataSet;Integrated Security=true");
Console.WriteLine("test"); // works
conn.Open();
Console.WriteLine("test"); // does not work
So some information about the database is that it's local under my 'Data Connections' in my Server Explorer. I also have the .xsd file in my project so I have linked the Data Set to the current project I am on. Here is a picture representation to confirm that I have both the Data Connection and the Data Set.
EDIT: SO does not allow me to post pictures until I have 10 rep so here is direct link to picture:
DB Screenshot
Any help is appreciated thank you.
Visual Studio comes with LocalDB database, which is not exactly SQL Server Express database.
Try something like this:
Server=(localdb)\v11.0;Integrated Security=true;
or
Data Source=(LocalDB)\v11.0; AttachDbFileName=|DataDirectory|\DatabaseFileName.mdf; InitialCatalog=DatabaseName;Integrated Security=True;MultipleActiveResultSets=True
If using in c# code, you can use # to avoid problems with backslash characters:
SqlConnection conn =
new SqlConnection(#"Server=(localdb)\v11.0;Integrated Security=true;");
I created my vb.net project to .exe file.
During installation on another machine, one can change the location of installing package to any drive.
In my project, I have set my app.config to point the Database that is available in c:\project.
If I suppose, while installation, when I change the location of installation to **d:** or anywhere, I get invalid access db.
What I want is:
I want to reconfigure my app.config file automatically, by detecting its current db location.
Imports System.Configuration
Imports System.Configuration.ConfigurationManager
Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
config.ConnectionStrings.ConnectionStrings("MyProject.Properties.Settings.MyProjectConString").ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;DataSource=|DataDirectory|\SampleDB;Persist Security Info=True;"
config.Save(ConfigurationSaveMode.Modified)
Where MyProject.Properties.Settings.MyProjectConString is the name of your project and connection string.
Although this is too late to answer as the question is very old but I think this might help someone else in the future.
So, there is a way to change the Connection String value in the runtime. Since connection string is a read-only item like all other items that are on Application Scope under My.Settings so we can't change it using My.Setting.ConnectionString = "Something". But here is the code by which you can solve the issue and change any My.Settings item that is on Application Scope in the runtime.
So the code is,
My.Settings.Item("ConnectionString") = "Something"
simple...
MsgBox(My.Settings.Item("remoteAddress").ToString)
My.Settings.Item("remoteAddress") = "abcserver.servebbs.net"
My.Settings.Save()
MsgBox(My.Settings.Item("remoteAddress").ToString)
You have three options:
1.) Create and use a folder in C:\Databse and set your connection string at design time.
2.)Add the database to the project's data source at design time, then use '|Data Directory|\mydb.mdb' as your connection string.
3.) And if you use sqlserver, you don't need to worry about the location of the database once you have attached the database to sqlserver. You only need to use the proper connection string eg 'Data Source=.; Database = mydb; Integrated Security = False; Username=myusername; Password = mypassword; User Instance = false'.
The above is an example of a sql server with SQL Authentication mode as login, if you use Windows Authentication, set Integrated Security = True and remove both username and password.
I have small method to get connection to Lotus Domino database:
Session session = NotesFactory.createSession(host, user, password);
Database db = session.getDatabase(serverName, dbName);
So now I need to get some info from db with search() method. And as I know I need to use some "search formula". For example form="formUnit" & #IsUnavailable($Conflict)
What type of script is this, where I can find inforamtion about this?
It's Notes/Domino Formula language. More info here:
http://publib.boulder.ibm.com/infocenter/domhelp/v8r0/index.jsp?topic=%2Fcom.ibm.designer.domino.main.doc%2FH_NOTES_FORMULA_LANGUAGE.html
You cannot use #Commands in db.search() and also not all #Formulas. Check also db.FTSearch() which is much faster in big databases but the db needs to be full text indexed.
I'm using an application called Logi info. it requires a connection string to my oracle database. the connection works fine but in order to configure the connection to recive ref cursors from the database, I apparently need to add PLSQLRSet=1 to the end of the string. when I do that I recieve an error "invalid connection string"
Here is my connection string without plsqlrset=1
Data Source=SID; User Id=username; Password=password;
My concern is that PLSQLRSet=1 might be .NET paramater only. Can anyone shed some light on the issue.
Thanks
It appears that the PLSQLRset option is a feature of the OraOLEDB provider (per http://download.oracle.com/docs/cd/B10501_01/win.920/a95498/using.htm).
Therefore I would guess that you have to add Provider=OraOLEDB.Oracle to the connect string -- as shown in the screenshot on the page you linked to -- in order to use this option.