I have a connectionstring in Mysql and how i can check that is valid or not means to say i want to test the connectionstring as well other software give functionality like in many software a option come called something like Test Connection [based on connectionstring].
any c# sample code to do that
Create a connection read server version or some generic data which you know for sure, would be present on database server. For example I read ##version in SQL Server to check what version of SQL Server user has and show the version. If no version returned connection couldn't be established.
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Good morning all,
recently I came upon problem with DB connection in Python and C#.
For example, let's say we want to connect SQL Server. In .NET (C#) we just need to know the server name, credentials and we can connect to DB with SqlConnection object. That's clear.
Now, in Python, when using pypyodbc we need to specify driver additionally. And here's come the question:
Why in Python we have to specify driver? We don't have to specify it in C#.
On the other hand, if specifying driver is so crucial, then why don't we have to specify it in C#?
I know, that in C# we have dedicated class for SQL Server (does Python? or pypyodbc is the only choice?), does that mean, that it has some method to resolve which driver to use? Is it the same with Oracle?
I know nothing about python, but I think that should answer your main question:
SqlConnection is designed specifically to work with SQL server, so you don't need to specify the driver, because it uses it's own designated driver.
From SqlConnection.ConnectionString Property page on Microsoft docs:
The ConnectionString is similar to an OLE DB connection string, but is not identical. Unlike OLE DB or ADO, the connection string that is returned is the same as the user-set ConnectionString, minus security information if the Persist Security Info value is set to false (default). The .NET Framework Data Provider for SQL Server does not persist or return the password in a connection string unless you set Persist Security Info to true.
(Emphasis mine, other stuff in the quot are just to provide context.)
And later on down the page:
The .NET Framework Data Provider for SQL Server uses its own protocol to communicate with SQL Server. Therefore, it does not support the use of an ODBC data source name (DSN) when connecting to SQL Server because it does not add an ODBC layer.
(again, emphasis mine.)
When working with other connection classes such as OdbcConnection or OleDbConnection, you need to specify the driver in the connection string.
With Odbc Connection Strings use the keyword Driver,
and with OleDb Connection Strings use the keyword Provider.
About Oracle, The .Net framework have a namespace called System.Data.OracleClient, but it's deprecated (from Oracle and ADO.NET):
The types in System.Data.OracleClient are deprecated. The types remain supported in the current version of.NET Framework but will be removed in a future release. Microsoft recommends that you use a third-party Oracle provider.
I'm guessing Oracle's own ADO.Net implementation also works with it's own driver. If you really want to know, you can look it up in their documentation.
I have produced a small program that uses a database created in MS Access. I have created about 5 queries for the database to test it and everything is working fine. I want to learn something new, so I decided to improve my program by migrating DB to SQL Server, but I don't really know where to start from. I have installed MS SQL Server 2012 and looking for some tutorials/pointers for beginners. My initial goals are:
Convert MS Access database to SQL Server
I believe that the up-size wizard included in MS Access can be sufficient for the job. Am I right?
Connect my C# program to DB saved on SQL Server
I think that I should edit my connection string and replace OleDb with something else... What should it be?
I am not sure if the tool exists also for Sql Server 2012 but in 2008 R2 you have a menu entry in the Program Group for Sql Server called Data Import Export (32bit) (Translated from my localization, hope to be near at the exact thing) that could be used to port an MS Access Database to a SQL Server. Of course you need install Sql Server Management Studio to manage the fine details of your new database.
For the code part (connection string) you could continue to use OleDb changing only the connection string (see here at www.connectionstrings.com), but your best option is to change everything and use the classes in the namespace System.Data.SqlClient like SqlConnection instead of OleDbConnection, SqlCommand instead of OleDbCommand and so on....
I have built a C# Project with SQL Server database
The connection string is
Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\GadoLab\GadoLab.mdf;Integrated Security=True;Connect Timeout=30
I have put it on another computer for testing yesterday with SQL Express installed and put the program on the specified path as connection string but the program when i open it tells me that it can't connect to the database.
I also noticed that the SQL agent service isn't running and I can`t start it
what's the solution please?
The SQL Authentication mode is windows type
Few reasons of connection failures:
1. Wrong Connection String.
2. Lack of database existance.(Database does not exists)
3. Login Problems to database. (Wrong ID and password to database authentication)
4. Database is present on remote server and server is turned off.
There can be many more, but which one to apply in your case depends upon your code and exact situation of database.
I need to fetch data from sybase database. I am doing it by creating a System DSN/User DSN in dev environment. This can't be a solution in production. Is there any other alternate way similar like SQLclient for SQL for which I dont need to do anything except knowing Server/Database/UserName/Password.
Is there anything similar to sybase(The Data Provider)?
The answer is: isql
For more information about isql check out the following link:
http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.infocenter.dc35456.1570/html/ocspsunx/X33477.htm
I think isql is included in the software developer kit:
http://downloads.sybase.com/swd/summary.do?client=support&baseprod=1038
Hey guys I'm new to C# and I'm a little confused on the fields that need to be provided in the connection string while using oledb to connect to my sql server 2008 database, particularly one of them.
The "Provider" field is really giving me problems, partially because I'm not really sure what it does. I have tried two different Provider strings and they both come back with the same error:
The "System.Data.SqlClient provider is not registered on the local machine
Or
The "Microsoft.Jet.OLEDB.4.0" provider is not registered on the local machine
Can someone tell me what this means? Also, my task requires me to not use any addition installations, is there a provider that is default?
Thanks
The Microsoft Jet Engine is the database engine used in Microsoft Access. The error simply means that the required Access version is not installed and thus, your application cannot open the OLEDB driver.
Generally, you should probably just use the System.Data.SqlClient.SqlConnection class instead of the System.Data.OleDb.OleDbConnection class to connect to your SQL Server 2008 database. The connection string should be much simpler.