Question : I have an web application that uses .NET Entity Framework library to access a Sql Server Database. What should I do to change it to MySQL ?
Some more details
I tried changing the parameters in app.config and here is my app.config file.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="mysql_db" connectionString="server=localhost;user id=root;password=;database=foo" providerName="MySql.Data.MySqlClient" />
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
<provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=6.9.7.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d"></provider>
</providers>
</entityFramework>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
</configuration>
I ran the app after using the above file and I get the following error.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
What else should I change to make it use a MySQL database. I have installed the necessary tools (MySQL, .NET MySQL Connector, MySQL for Visual Studio).
I think you should install MySQL Connector/Net and the configure a proper connection string (this is a sample)
Here you can find doc x ef6
<connectionStrings>
<add name="MyContext" providerName="MySql.Data.MySqlClient"
connectionString="server=localhost;port=3306;database=mycontext;uid=root;password=********"/>
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework"/>
<providers>
<provider invariantName="MySql.Data.MySqlClient"
type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6"/>
<provider invariantName="System.Data.SqlClient"
type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer"/>
</providers>
</entityFramework>
Related
I created an application in c# with wpf using EntityFramework.
When I create the setup it works fine on my computer but when I install it on another computer I get this error
A file activation error occured. The physical file name \Data\myDb.mdf may be incorrect. Diagnose and correct additionnal errors, and retry the operation. CREATE DATABASE failed. Some file names listed could not be created. Check related errors.
Here is my App.config
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="myConnectionString" connectionString="Data Source=(LocalDB)\MSSQLLocalDB;
AttachDbFileName='|DataDirectory|\Data\myDb.mdf';
Initial Catalog=myDb.mdf; Integrated Security=True" providerName="System.Data.SqlClient" />
</connectionStrings>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
<entityFramework>
<defaultConnectionFactory type="EntityFramework">
<parameters>
<parameter value="mssqllocaldb" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
</configuration>
You could try to set the value for |DataDirectory| during runtime:
AppDomain.CurrentDomain.SetData("DataDirectory", #"C:\Program Files (x86)\Company\AppFolder\")
Or replace |DataDirectory| with an absolute path in your configuration file.
I've deployed a wpf simple application with localdb mdf embeded and entity framework 6, when I test my application at windows 7 the application crash when try access database.
I already installed localdb version 2012, 2014 and netframework 4.7 in this client machine but keeps crashing on query window.
I'm using Visual Studio 2015 Anyone have experiencied this?
dependencies installed in client machine:
net framework. 4.6.1 or above
LocalDB 32BIT\SqlLocalDB.msi or LocalDB 64BIT\SqlLocalDB.msi
Here my appconfig:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
</startup>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlCeConnectionFactory, EntityFramework">
<parameters>
<parameter value="System.Data.SqlServerCe.4.0" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
<provider invariantName="System.Data.SqlServerCe.4.0" type="System.Data.Entity.SqlServerCompact.SqlCeProviderServices, EntityFramework.SqlServerCompact" />
</providers>
</entityFramework>
<system.data>
<DbProviderFactories>
<remove invariant="System.Data.SqlServerCe.4.0" />
<add name="Microsoft SQL Server Compact Data Provider 4.0" invariant="System.Data.SqlServerCe.4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
</DbProviderFactories>
</system.data>
<connectionStrings>
<add name="AgroTarifaEntities" connectionString="metadata=res://*/ModelAgro.csdl|res://*/ModelAgro.ssdl|res://*/ModelAgro.msl;provider=System.Data.SqlClient;provider connection string="data source=(LocalDB)\MSSQLLocalDB;attachdbfilename=|DataDirectory|\AgroTarifa.mdf;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework""
providerName="System.Data.EntityClient" />
<add name="AgroTarifa.Properties.Settings.AgroTarifaConnectionString"
connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\AgroTarifa.mdf;Integrated Security=True"
providerName="System.Data.SqlClient" />
</connectionStrings>
</configuration>
This is just a hunch, but maybe that connection string is being used as a literal. Try replacing all instances of " with a single quote. Let me know if that works-it may come up in my work down the road.
I Fixed the problem installing on windows 7 client ssdt package it's not the best practice... but fixed for the user.
here the SSDT resource page
https://learn.microsoft.com/pt-br/sql/ssdt/download-sql-server-data-tools-ssdt?view=sql-server-2017
We have an application that is going to be deployed on Windows XP that uses Entity Framework 6 and SQL Server Express.
Here's how the application's app config file looks :
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
</startup>
<connectionStrings>
<add name="Rust" connectionString="Data Source=(ip here).\SQLEXPRESS;Initial Catalog=Rust;Integrated Security=True" providerName="System.Data.SqlClient" />
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="mssqllocaldb" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
Whenever we change the connection string to connect to an actual server and the application is being ran on Windows 7 it works fine. But if it is ran on Windows XP there occurs an unhandled exception which we cannot trace:
It happens when we try to retrieve some information from the database
Task.Factory.StartNew(() =>
{
//here
departments = new ObservableCollection<Department>(this.GetAllDepartments());
});
The SQL Server to which we connect is an SQL Server 2012 Express. Here's how the App config on the data access layer looks like:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"/>
</configSections>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="mssqllocaldb"/>
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer"/>
</providers>
</entityFramework>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup>
</configuration>
Here's what the problem was :
We have been using a VM named VirtualBox which had Windows XP installed on it. We tried installing Visual Studio 2010 and debugging the application from there but that wasn't successful. After two days of banging our heads about why this doesn't work we tried using the VMWare workstation and it it worked fine!! There must be some kind of problem with the VirtualBox software.
Thank you guys for the suggestions!
I am using Entity framework 6.1.3 version.
I am using Oracle 11g version.
I am trying to connect to Oracle through Entity framework.
I am facing issue while trying to open connection.
Below is my config file and code to connect:
----------
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="FOLADB" connectionString="Data Source=HRFOLATEST1;User id=***;Password=***;" providerName="Oracle.ManagedDataAccess.Client"/>
</connectionStrings>
<entityFramework>
<!--<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />-->
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v11.0" />
</parameters>
</defaultConnectionFactory>
<providers>
<!--<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />-->
<provider invariantName="Oracle.ManagedDataAccessClient" type="Oracle.ManagedDataAccessClient.OracleClientFactory, Oracle.ManagedDataAccessClient" />
</providers>
</entityFramework>
</configuration>
string connectionString = ConfigurationManager.ConnectionStrings["SConnectionString"].ToString();
OracleConnection connSSTrack = new OracleConnection(connectionString);
connSSTrack.Open();
I am getting the below error:
ORA-12154: TNS:could not resolve the connect identifier specified.
When I am using the same connection string in another asp.net application,it is working fine.
Check your TNS settings. You can supply them is your connect string or find them in your tnsnames.ora. https://blog.vijay.name/2012/11/oracle-managed-odp-net/
How do I change my app.config or Migration Configuration.cs file so Entity Framework uses a local SDF file instead of a local SQL Server instance ? I am using EF 6.1.
Thanks
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework"type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
</configuration>
You should just be able to specify the ProviderName in the connection string to your database.
<connectionStrings>
<add name="DataModelContext"
providerName="System.Data.SqlServerCe.4.0"
connectionString="Data Source=location\cfdb.sdf"/>