A .NET Framework data provider is used for connecting to a database, executing commands, and retrieving results. Those results are either processed directly, placed in a DataSet in order to be exposed to the user as needed, combined with data from multiple sources, or remoted between tiers. .NET Framework data providers are lightweight, creating a minimal layer between the data source and code, increasing performance without sacrificing functionality.
The following table lists the data providers that are included in the .NET Framework.
.NET Framework data provider | Description |
---|---|
.NET Framework Data Provider for SQL Server | Provides data access for Microsoft SQL Server. Uses the System.Data.SqlClient namespace. |
.NET Framework Data Provider for OLE DB | For data sources exposed by using OLE DB. Uses the System.Data.OleDb namespace. |
.NET Framework Data Provider for ODBC | For data sources exposed by using ODBC. Uses the System.Data.Odbc namespace. |
.NET Framework Data Provider for Oracle | For Oracle data sources. The .NET Framework Data Provider for Oracle supports Oracle client software version 8.1.7 and later, and uses the System.Data.OracleClient namespace. |
EntityClient Provider | Provides data access for Entity Data Model (EDM) applications. Uses the System.Data.EntityClient namespace. |
.NET Framework Data Provider for SQL Server Compact 4.0. | Provides data access for Microsoft SQL Server Compact 4.0. Uses the System.Data.SqlServerCe namespace. |
Core Objects of .NET Framework Data Providers
The following table outlines the four core objects that make up a .NET Framework data provider.
Object | Description |
---|---|
Connection | Establishes a connection to a specific data source. The base class for all Connection objects is the DbConnection class. |
Command | Executes a command against a data source. Exposes Parameters and can execute in the scope of a Transaction from a Connection . The base class for all Command objects is the DbCommand class. |
DataReader | Reads a forward-only, read-only stream of data from a data source. The base class for all DataReader objects is the DbDataReader class. |
DataAdapter | Populates a DataSet and resolves updates with the data source. The base class for all DataAdapter objects is the DbDataAdapter class. |
In addition to the core classes listed in the table earlier in this document, a .NET Framework data provider also contains the classes listed in the following table.
Object | Description |
---|---|
Transaction | Enlists commands in transactions at the data source. The base class for all Transaction objects is the DbTransaction class. ADO.NET also provides support for transactions using classes in the System.Transactions namespace. |
CommandBuilder | A helper object that automatically generates command properties of a DataAdapter or derives parameter information from a stored procedure and populates the Parameters collection of a Command object. The base class for all CommandBuilder objects is the DbCommandBuilder class. |
ConnectionStringBuilder | A helper object that provides a simple way to create and manage the contents of connection strings used by the Connection objects. The base class for all ConnectionStringBuilder objects is the DbConnectionStringBuilder class. |
Parameter | Defines input, output, and return value parameters for commands and stored procedures. The base class for all Parameter objects is the DbParameter class. |
Exception | Returned when an error is encountered at the data source. For an error encountered at the client, .NET Framework data providers throw a .NET Framework exception. The base class for all Exception objects is the DbException class. |
Error | Exposes the information from a warning or error returned by a data source. |
ClientPermission | Provided for .NET Framework data provider code access security attributes. The base class for all ClientPermission objects is the DBDataPermission class. |
.NET Framework Data Provider for SQL Server (SqlClient)
The .NET Framework Data Provider for SQL Server (SqlClient) uses its own protocol to communicate with SQL Server. It is lightweight and performs well because it is optimized to access a SQL Server directly without adding an OLE DB or Open Database Connectivity (ODBC) layer. The following illustration contrasts the .NET Framework Data Provider for SQL Server with the .NET Framework Data Provider for OLE DB. The .NET Framework Data Provider for OLE DB communicates to an OLE DB data source through both the OLE DB Service component, which provides connection pooling and transaction services, and the OLE DB provider for the data source.
Note
The .NET Framework Data Provider for ODBC has a similar architecture to the .NET Framework Data Provider for OLE DB; for example, it calls into an ODBC Service Component.
Comparison of the .NET Framework Data Provider for SQL Server and the .NET Framework Data Provider for OLE DB
The .NET Framework Data Provider for SQL Server classes are located in the System.Data.SqlClient namespace.
The .NET Framework Data Provider for SQL Server supports both local and distributed transactions. For distributed transactions, the .NET Framework Data Provider for SQL Server, by default, automatically enlists in a transaction and obtains transaction details from Windows Component Services or System.Transactions. For more information, see Transactions and Concurrency.
The following code example shows how to include the System.Data.SqlClient
namespace in your applications.
.NET Framework Data Provider for OLE DB
The .NET Framework Data Provider for OLE DB (OleDb) uses native OLE DB through COM interop to enable data access. The .NET Framework Data Provider for OLE DB supports both local and distributed transactions. For distributed transactions, the .NET Framework Data Provider for OLE DB, by default, automatically enlists in a transaction and obtains transaction details from Windows Component Services. For more information, see Transactions and Concurrency.
The following table shows the providers that have been tested with ADO.NET.
Driver | Provider |
---|---|
SQLOLEDB | Microsoft OLE DB provider for SQL Server |
MSDAORA | Microsoft OLE DB provider for Oracle |
Microsoft.Jet.OLEDB.4.0 | OLE DB provider for Microsoft Jet |
Note
Using an Access (Jet) database as a data source for multithreaded applications, such as ASP.NET applications, is not recommended. If you must use Jet as a data source for an ASP.NET application, realize that ASP.NET applications connecting to an Access database can encounter connection problems.
The .NET Framework Data Provider for OLE DB does not support OLE DB version 2.5 interfaces. OLE DB Providers that require support for OLE DB 2.5 interfaces will not function correctly with the .NET Framework Data Provider for OLE DB. This includes the Microsoft OLE DB provider for Exchange and the Microsoft OLE DB provider for Internet Publishing.
The .NET Framework Data Provider for OLE DB does not work with the OLE DB provider for ODBC (MSDASQL). To access an ODBC data source using ADO.NET, use the .NET Framework Data Provider for ODBC.
.NET Framework Data Provider for OLE DB classes are located in the System.Data.OleDb namespace. The following code example shows how to include the System.Data.OleDb
namespace in your applications.
.NET Framework Data Provider for ODBC
The .NET Framework Data Provider for ODBC (Odbc) uses the native ODBC Driver Manager (DM) to enable data access. The ODBC data provider supports both local and distributed transactions. For distributed transactions, the ODBC data provider, by default, automatically enlists in a transaction and obtains transaction details from Windows Component Services. For more information, see Transactions and Concurrency.
The following table shows the ODBC drivers tested with ADO.NET.
Driver |
---|
SQL Server |
Microsoft ODBC for Oracle |
Microsoft Access Driver (*.mdb) |
.NET Framework Data Provider for ODBC classes are located in the System.Data.Odbc namespace.
The following code example shows how to include the System.Data.Odbc
namespace in your applications.
Note
The .NET Framework Data Provider for ODBC requires MDAC 2.6 or a later version, and MDAC 2.8 SP1 is recommended. You can download MDAC 2.8 SP1 from the Data Access and Storage Developer Center.
.NET Framework Data Provider for Oracle
The .NET Framework Data Provider for Oracle (OracleClient) enables data access to Oracle data sources through Oracle client connectivity software. The data provider supports Oracle client software version 8.1.7 or a later version. The data provider supports both local and distributed transactions. Torrent crack chiavetta coges. For more information, see Transactions and Concurrency.
The .NET Framework Data Provider for Oracle requires Oracle client software (version 8.1.7 or a later version) on the system before you can connect to an Oracle data source.
.NET Framework Data Provider for Oracle classes are located in the System.Data.OracleClient namespace and are contained in the System.Data.OracleClient.dll
assembly. You must reference both the System.Data.dll
and the System.Data.OracleClient.dll
when you compile an application that uses the data provider.
The following code example shows how to include the System.Data.OracleClient
namespace in your applications.
Choosing a .NET Framework Data Provider
Depending on the design and data source for your application, your choice of .NET Framework data provider can improve the performance, capability, and integrity of your application. The following table discusses the advantages and limitations of each .NET Framework data provider.
Provider | Notes |
---|---|
.NET Framework Data Provider for SQL Server | Recommended for middle-tier applications that use Microsoft SQL Server. Recommended for single-tier applications that use Microsoft Database Engine (MSDE) or SQL Server. Recommended over use of the OLE DB provider for SQL Server (SQLOLEDB) with the .NET Framework Data Provider for OLE DB. |
.NET Framework Data Provider for OLE DB | For SQL Server, the .NET Framework Data Provider for SQL Server is recommended instead of this provider. Recommended for single-tier applications that use Microsoft Access databases. Use of an Access database for a middle-tier application is not recommended. |
.NET Framework Data Provider for ODBC | Recommended for middle and single-tier applications that use ODBC data sources. |
.NET Framework Data Provider for Oracle | Recommended for middle and single-tier applications that use Oracle data sources. |
EntityClient Provider
The EntityClient provider is used for accessing data based on an Entity Data Model (EDM). Unlike the other .NET Framework data providers, it does not interact directly with a data source. Instead, it uses Entity SQL to communicate with the underlying data provider. For more information, see EntityClient Provider for the Entity Framework.
See also
This is really weird. I have uninstalled and installed the Firebird client 4.6.1.0 and the DDEXProvider 3.0.1.0. I have also used the nuget to install firebird into the solution. If I try to edit my existing connection string in the Settings I get an error 'Unable to find the Requested .Net Framework Data Provider. It may not be installed.' If I attempt to add a connection to the server explorer I can get the add connection form but I cannot fill in the required information. The Firebird Data Source is listed next to the change box. If I start to type in the Data Source text box the form closes. I can launch the project and it will work. I just cannot add or edit anything in any dataset created earlier. Has anyone experienced this and what steps resolved it.Capture1.PNG
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The System.Data.SQLite DDEX provider does not support Visual Studio 2017. This post describes how to work with SQLite and Entity Framework 6 in Visual Studio 2017, using the 'SQLite Toolbox' DDEX provider for EF6. Notice that this provider only supports the EF 6 Tools, and not other Data Source scenarios, for example Typed DataSets. This requires Visual Studio 2017 15.8 (or 15.6 and earlier)
- Install Toolbox
- Install SQLite in GAC
- Install SQLite EF provider in project
- Run EDM Wizard
Install latest Toolbox
Once per Visual Studio edition (daily build at https://github.com/ErikEJ/SqlCeToolbox/wiki/Release-notes )
Install SQLite in GAC
Once per machine. Download sqlite-netFx46-setup-bundle-x86-2015-1.0.108.0.exe (from https://system.data.sqlite.org/index.html/doc/trunk/www/downloads.wiki)
Select 'Full Installation'
![Ddex provider are not installed for provider oracle.manageddataaccess.client Ddex provider are not installed for provider oracle.manageddataaccess.client](https://www.keycloak.org/docs/3.2/server_admin/keycloak-images/kerberos-provider.png)
Select: Install the assemblies into the global assembly cache - Install VS designer components
Restart Visual Studio
Verify that the EF6 provider is installed in GAC from the Toolbox 'About' dialog:
![Ddex Provider Not Installed Ddex Provider Not Installed](https://firebirdsql.org/file/documentation/reference_manuals/fbdevgd-en/html/images/fbdevgd30_efw_003_en.png)
If the EF6 provider is not in GAC, this may be due to an invalid entry in machine.config, located in the C:WINDOWSMicrosoft.NETFrameworkv4.0.30319Config folder. The only SQLite related entry should look like this, with this exact version number:
If you are using Visual Studio 15.7, that includes the updated EF 6.2 Tools, generating an EDMX is broken. You can add the following entry (as the last netry in the list) to the DbProviderfactories section in your machine.config as a workaround until this issue has been fixed (remember to restart Visual Studio after making the change):
Some users report that adding this to app.config solves some runtime issues (related the the VS 15.7 issues mentioned above)
Install System.Data.Sqlite NuGet package
Install using Package Manager Console or NuGet Manager in each project.
Make sure to install the same version as the tools package above.
Build project!
Packages.config should look like this after install:
App.config should look like this:
Run Entity Data Model Wizard
Add, New Item, Data, ADO.NET Entity Data Model. Choose 'EF Designer from Database' or 'Code First from Database'
Use 'SQLite Provider (Simple for EF6 by ErikEJ)' when creating a connection to your SQLite database file. Enter the full path to your database file in Data Source.
A reader of this wiki post has provided some additional tips here
My organization upgraded from Visual Studio 2013 to Visual Studio 2015 RC a couple months ago, and we only just now attempted to update some of our existing 'db-first' EntityFramework models from our MySQL database. When doing so, we received the following error.
An exception of type 'System.ArgumentException' occurred while attempting to update from the database. The exception message is: 'Unable to convert runtime connection string to its design-time equivalent. The libraries required to enable Visual Studio to communicate with the database for design purposes (DDEX provider) are not installed for provider 'MySql.Data.MySqlClient'.
A quick SO search for this error produced this result from November of 2013 (specifically in reference to VS 2013)..
Apparently MySql and Visual Studio 2013 don't work together yet.
Here is a link on the MySql forums: http://forums.mysql.com/read.php?174,594798,600466#msg-600466
![Installed Installed](https://i.stack.imgur.com/mSbe3.jpg)
You'll probably need to wait for the next release of the MySql connector.
Does that mean this is likely a comparable issue, and we just have to wait it out until a new MySql.Data client is available that is compatible with VS 2015? Or is it possible that some other cause is to blame (perhaps a bug in VS 2015 RC)?
We're on the latest stable versions of Entity Framework (6.1.3), MySql.Data (6.9.6) and MySql.Data.Entity (6.9.6).
Especially curious to hear if anyone else has stumbled across this issue with VS 2015 RC in particular.
4 Answers
What worked for me was to update the visual studio plugin, available here:http://dev.mysql.com/downloads/windows/visualstudio/
Could you please update your VS 2015 from RC to RTM, update the nuget packages by running the following command:
update-package
Ddex Provider Are Not Installed For Provider Oracle.manageddataaccess.client
This will get all latest stable nuget package in VS 2015.
Let me know if this fix your issue.
In my case I installed VS 2017 after Mysql and because of that Mysql Visual Studio components didn't install for VS 2017.
For doing that, open MySQL for VS install and pick 'Change'
And check components for VS 2017
My reputation isn't high enough to leave a comment but this could help someone that ends up on this page. My case was similar to neustart47's however I tried to install the components through mysql installer - community, which failed complaining that VS wasn't installed (or something along those lines), which it was. So make sure to use the stand alone installer and not the mysql community installer. Why this even is a problem, I don't know.