I'm new in ASP.NET. Everytime I try to run my application, I encounter the error message below. I already installed .Net Framework Data Provider for MySQL several times.
I hope someone can help me on this. Thanks in advance.
Server Error in '/PLDT QuickSearcher' Application.
Unable to find the requested .Net Framework Data Provider. It may not be installed.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Unable to find the requested .Net Framework Data Provider. It may not be installed.
Add MySql.Data.dll as reference to the project
Add this block to web.config:
<system.data>
<DbProviderFactories>
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory,MySql.Data" />
</DbProviderFactories>
</system.data>
Reference the MySql.Data and MySql.Entities Nuget packages. Then add this line to your web config.
<system.data>
<DbProviderFactories>
<remove invariant="MySql.Data.MySqlClient" />
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.5.4.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
</DbProviderFactories>
</system.data>
Your connection string should be similar to the following:
<add name="MyDb" connectionString="Server=127.0.0.1;Port=3306;Database=MyDb;Uid=root;Pwd=;" providerName="MySql.Data.MySqlClient" />
I have solved this problem with following configuration
<system.data>
<DbProviderFactories>
<remove invariant="MySql.Data.MySqlClient" />
<add name="MySQL Data Provider"
invariant="MySql.Data.MySqlClient"
description=".Net Framework Data Provider for MySQL"
type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data" />
</DbProviderFactories>
</system.data>
<entityFramework>
<providers>
<provider invariantName="MySql.Data.MySqlClient"
type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
</providers>
</entityFramework>
Related
I have a entity framework Data access layer building in .Net framework 4.7.2
And I am trying to reference it from .Net core console app.
I keep getting the error
The ADO.NET provider with invariant name 'Npgsql' is either not registered in the machine or application config file, or could not be loaded. See the inner exception for details.
I have added the below code based on the suggestions on web, but then the error change to a different method which uses system.configuration and the error goes 'cannot initialize the configuration' system.data is invalid config section
<entityFramework>
<providers>
<provider invariantName="Npgsql" type="Npgsql.NpgsqlServices, EntityFramework6.Npgsql" />
<!--<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />-->
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
<defaultConnectionFactory type="Npgsql.NpgsqlConnectionFactory, EntityFramework6.Npgsql" />
</entityFramework>
<system.data>
<DbProviderFactories>
<!--<add name="dotConnect for PostgreSQL" invariant="Devart.Data.PostgreSql" description="Devart dotConnect for PostgreSQL" type="Devart.Data.PostgreSql.PgSqlProviderFactory, Devart.Data.PostgreSql, Version= 7.17.1583.0, Culture=neutral, PublicKeyToken=09af7300eec23701" />-->
<!--<add name="Npgsql Provider" invariant="Npgsql" description=".NET Framework Data Provider for PostgreSQL" type="Npgsql.NpgsqlFactory, Npgsql, Version=4.1.3.0, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7" />-->
<add name="Npgsql Data Provider" invariant="Npgsql" description=".Net Data Provider for PostgreSQL" type="Npgsql.NpgsqlFactory, Npgsql, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7" />
<remove invariant="Npgsql" /><add name="Npgsql Provider" invariant="Npgsql" description=".NET Framework Data Provider for PostgreSQL" type="Npgsql.NpgsqlFactory, Npgsql, Version=4.1.3.0, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7" /></DbProviderFactories>
</system.data>
For .NET Core you need to call DbProviderFactories.RegisterFactory instead of using config files.
System.Data.Common.DbProviderFactories.RegisterFactory("NpgSql", Npgsql.NpgsqlFactory.Instance);
Before I describe the problem, I want to let you know that I went over like 30 different answers on Stack Overflow that seems to be similar to my problem, but none of thee solution helped me solve this.
The issue:
The wizard while creating ADP.NET Entity Data Model quits after I click "Next" in the "Choose Your Data Connection" step without any error or notification, the window just closes and no file is generated. There is nothing in the output or error window as well.
I have a C# .NET 4.6.1 web form project with the following packages:
Entity Framework 6.2.0
MySql.Data 8.0.11
MySql.Data Entities 6.8.3
MySql.Data Entity 6.10.7
MySql.Web 8.0.11
I clean and rebuild the project, load VS with Administer account, tried to remove connections from server explorer and try again, I have the latest .NET connector installed, but nothing helped.
Related Web.cofig parts:
<configSections>
<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="MySql.Data.Entity.MySqlConnectionFactory, MySql.Data.Entity.EF6" />
<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>
<system.data>
<DbProviderFactories>
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.10.7.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
</DbProviderFactories>
I am trying to use Entity Framework 6 with SQLite and running into a database locked issue when trying to use TransactionScope. Here is my code:
using (var txn = new TransactionScope())
{
using (var ctx = new CalibreContext())
{
var book = ctx.Books.First(x => x.Id == 2);
var author = ctx.Authors.First(x => x.Id == 3);
book.Authors.Add(author);
ctx.SaveChanges();
}
txn.Complete();
}
First line var book = ctx.Books.First(x => x.Id == 2); executes ok. but then once I move on to the next one I get an exception saying that my database is locked. Here is my app config:
<configuration>
<configSections>
<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="CalibreContext" connectionString="Data Source=metadata.db" providerName="System.Data.SQLite.EF6" />
</connectionStrings>
<system.data>
<DbProviderFactories>
<remove invariant="System.Data.SQLite" />
<add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".Net Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite, Version=1.0.98.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139" />
<remove invariant="System.Data.SQLite.EF6" />
<add name="SQLite Data Provider (Entity Framework 6)" invariant="System.Data.SQLite.EF6" description=".Net Framework Data Provider for SQLite (Entity Framework 6)" type="System.Data.SQLite.EF6.SQLiteProviderFactory, System.Data.SQLite.EF6, Version=1.0.98.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139" />
</DbProviderFactories>
</system.data>
<entityFramework>
<defaultConnectionFactory type="Calibre.Dal.Ef.SQLiteConnectionFactory, Calibre.Dal.Ef" />
<providers>
<provider invariantName="System.Data.SQLite.EF6" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6, Version=1.0.98.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139" />
<provider invariantName="System.Data.SQLite" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6, Version=1.0.98.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139" />
</providers>
</entityFramework>
</configuration>
I need to use TransactionScope because in addition to performing a DB operation, I also have to perform a file system operation that I plan on adding to the same transaction (currently not there).
I was experiencing a similar issue. Just to be clear, the error I got on the second query was "the underlying provider failed on Open" (but the reason for the Open failure was that the database was locked).
Apparently the issue is related to MSDTC (TransactionScope is tightly coupled to MSDTC).
I found a community addition to an MSDN page which in turn references this blog post
... which states that transactions are "promoted" to MSDTC transactions if a connection is closed and reopened. Which EF does by default. Normally this is a good thing -- you don't want database handles hanging around forever -- but in this case that behavior gets in the way.
The solution is to explicitly open the database connection:
using (var txn = new TransactionScope())
{
using (var ctx = new CalibreContext())
{
ctx.Connection.Open();
// ... remainder as before ...
Alternatively, if all your CalibreContext objects are short-lived, you could conceivably open the connection in the CalibreContext constructor.
This seems to have fixed my issue. I'll post an update if I have anything else to report.
One common situation to cause this problem is that another application is accessing the same database.
In my situation it’s because that I opened the database with DB Browser for SQLite, deleted a database table and not applying the changes.
Clicking Write Changes (or Revert Changes or Close Database) and the error will be gone.
(Taken from http://redino.net/blog/2017/03/net-sqlite-database-locked)
I'm getting the following error while trying to connect to an Oracle database from a new ASP.NET MVC 4 application: "ORA-12154: TNS:could not resolve the connect identifier specified". I'm using the Oracle.ManagedDataAccess DLL (version 4.121.1.0) to try to connect to an Oracle 10g database. Here's the thing - I have an integration test assembly that is successfully connecting to the database using this minimal App.config:
<connectionStrings>
<add name="OracleConnection" connectionString="DATA SOURCE=TNS_NAME;PASSWORD=xxx;PERSIST SECURITY INFO=True;USER ID=xxx" providerName="Oracle.ManagedDataAccess.Client" />
</connectionStrings>
However, if I try to run my web app with all the crazy Web.config settings, I'm getting the error "ORA-12154: TNS:could not resolve the connect identifier specified". What am I doing wrong? Why is my config for the integration test assembly so simple and the Web.config so complex? Here's the pertinent sections of my Web.config (taken from Deploying and Configuring ODP.NET to work without installation with Entity Framework):
custom configSection:
<configSections>
<section name="oracle.manageddataaccess.client"
type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
</configSections>
the corresponding config section:
<oracle.manageddataaccess.client>
<version number="*">
<edmMappings>
<edmMapping dataType="number">
<add name="bool" precision="1"/>
<add name="byte" precision="2" />
<add name="int16" precision="5" />
</edmMapping>
</edmMappings>
</version>
</oracle.manageddataaccess.client>
custom system.data node:
<system.data>
<DbProviderFactories>
Remove in case this is already defined in machine.config
<remove invariant="Oracle.DataAccess.Client" />
<remove invariant="Oracle.ManagedDataAccess.Client" />
<add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client"
description="Oracle Data Provider for .NET, Managed Driver"
type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
</DbProviderFactories>
</system.data>
EntityFramework node:
<entityFramework>
<defaultConnectionFactory type="Victoria.Data.OracleConnectionFactory, EntityFramework" />
</entityFramework>
Update 1: After reading through http://docs.oracle.com/cd/E16655_01/win.121/e17732/featConfig.htm#ODPNT8161, I tried modifying my Web.config oracle.manageddataaccess.client to the following and it works. However, it doesn't seem right to have the connectionString node referencing the TNS name AND this extra reference to the same TNS Names file.
<oracle.manageddataaccess.client>
<version number="*">
<dataSources>
<dataSource alias="SIEBMATS" descriptor="(DESCRIPTION=(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = xxx.yyy.zzz)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = siebmats)))" />
</dataSources>
<edmMappings>
<edmMapping dataType="number">
<add name="bool" precision="1"/>
<add name="byte" precision="2" />
<add name="int16" precision="5" />
</edmMapping>
</edmMappings>
</version>
</oracle.manageddataaccess.client>
One thing you can try is having the connection string like so:
connectionString="Data Source=//SERVER:PORT/INSTANCE_NAME;USER=XXX;PASSWORD=XXX".
Useful references here:
http://www.connectionstrings.com/oracle/
http://docs.oracle.com/cd/E51173_01/win.122/e17732/featConnecting.htm#ODPNT169
This has also helped me while having problems with EF:
Deploying and Configuring ODP.NET to work without installation with Entity Framework
Hope to have helped.
My problem was in incorrect/incomplete Oracle Driver version, had 11.2.0 installed. I add another 12.2.0 version, didn't change anything in web.config and it worked as charm
I suggest to try the solution proposed by #kolbasov in another thread but about the same problem: https://stackoverflow.com/a/20050462/9390179
It worked for me:
<oracle.manageddataaccess.client>
<version number="*">
<settings>
<setting name="TNS_ADMIN" value="C:\Oracle\product\11.1.0\client_1\network\admin" />
</settings>
</version>
</oracle.manageddataaccess.client>
I am trying to open PostgreSQL connection but getting ReflectionTypeLoadException while opening connection.
Please help me out to solve this problem by providing code or let me know how to remove this exception.
Code i am using so far is below:
**/* Connection String
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="superuserDatabase" value="postgres"/>
</appSettings>
<system.data>
<DbProviderFactories>
<clear/>
<add name="Npgsql Data Provider"
invariant="Npgsql"
description=".Net Framework Data Provider for Postgresql Server"
type="Npgsql.NpgsqlFactory, Npgsql" />
</DbProviderFactories>
</system.data>
<connectionStrings>
<add name="Simple.Data.Properties.Settings.DefaultConnectionString"
connectionString="host=localhost;port=5432;database=SimpleData;user id=postgres;password=P#ssw0rdsa;pooling=false"
providerName="Npgsql" />
<add name="Test"
connectionString="host=localhost;port=5432;database=SimpleData;user id=postgres;password=P#ssw0rdsa;pooling=false"
providerName="Npgsql" />
</connectionStrings>
</configuration>**
*/
I am getting following exception when trying to open connection in POSTGRESQL
var namedDb = Database.OpenNamedConnection("Test").Demo.All();
ReflectionTypeLoadException
This ReflectionLoadTypeException is most often caused because the DLLs you're using aren't up to date so the dependency chain fails. Use nuget to update your project with the latest DLLs. v0.16.2.2 of the PostgreSql provider requires
Simple.Data.Core (≥ 0.12.2.2)
Simple.Data.Ado (≥ 0.12.2.2)
Npgsql (≥ 2.0.11)
(via Mark Rendle) Try explicitly installing 0.16.2.2 of Simple.Data.Ado first, then installing the Postgres package.