I'm supporting a legacy C# application which uses ADO.NET for data access. Today one of our client comes up with a different question
Are you using OLEDB or ODBC for data connection?
From my understanding my code is using anyone of this driver but not sure how to confirm. Below is the code sample. I'm using simple SQLConnection class but not sure how to identify the underlying driver. Can someone help?
System.Data.SqlClient.SqlConnection conn=new System.Data.SqlClient.SqlConnection()
conn.Open()
Please check this Microsoft documentation:
https://learn.microsoft.com/en-us/dotnet/framework/data/adonet/ado-net-code-examples
As you can see, you are using SQLCLient, not OleDb or ODBC.
SQLClient is an specific data provider for SQL Server. Also, you can check this link to learn a bit more about OLE DB and ODBC, and their differences:
what is the difference between OLE DB and ODBC data sources?
Related
I installed and configured sphinx search engine (v. 2.2.11) in ubuntu and integrated it with oracle database to retrieve and index data from oracle. I also can submit query through sql client of sphinx by using command line and every thing is ok.
Now my question is: How can I connect to sphinx through C#? There is no official API for .Net.ŮŽAlthough there are several 3rd party APIs, some of them not free and some will not be updated anymore. I also saw SphinxSE that is a mysql storage engine and According to what I understood, Only used when data is stored in mysql but my data is stored in oracle and I use odbc for integrating oracle and sphinx.
So, Should I write an api myself or there may be other ways?
Thanks for any suggestion
Just use SphinxQL and connect to your Sphinx instance using any mysql library. Just make sure sphinxql is enabled in your config, you should have smth like this:
listen = 9314:mysql41
This tells Sphinx to accept connections from mysql clients on port 9314.
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.
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.
We want to allow access to our custom back end data store by pretending to be an ODBC server such as Access or SQL Server. In this way, anyone with those ODBC drivers could connect and send us queries (from anything from asp.net to Excel) which we will resolve on the back end and return a result set.
I have the ability to parse SQL and return result set based on a dynamic sql query. What I don't know is how to pretend to be an ODBC or OLEDB server. I don't even care which server we mimic as long as it's a common one that has drivers that ship with windows.
I have searched but could not find a basic implementation that implements authentication and ExecuteQuery() methods. Does such a .net project exist?
You could implement an ADO.NET data provider?
see http://msdn.microsoft.com/en-us/library/a6cd7c08.aspx
The System.Data.Sqlite project is an excellent example of how to build an ADO.NET data provider for an arbitrary data store.
What's the best way to connect to a Informix database from .Net?
I'm developing a client-server application based on a legacy Informix DB which used to be connected by JDBC.
I need it, from the most important to the least:
To be fast
DB server changes not needed
No ODBC and no dependencies, other than de .Net Framework 2.0
Thanks in advance for your help.
The connections strings to use with OleDb or ADO.NET can be found here.
Take a look at this article on how to connect to an Informix database using ADO.NET.
We connect to Informix from .NET, but we do it via web services that are written in FourJ's BDL
http://publib.boulder.ibm.com/infocenter/idshelp/v10/index.jsp?topic=/com.ibm.relnotes.doc/uc3/netrel.htm
See if that helps. Also, what about the built in ODBC or OLEDB drivers? Have you tried those? Those might work.
You might like to investigate OpenLink's Multi-Tier Informix driver for ADO.Net (just install everything on the client): http://uda.openlinksw.com/dotnet/mt/dotnet-informix-mt/