I'm using Visual Studio 2012, EF, trying to update my database using the console but it fails.
I get a message that the connection string is incorrect although in reality it is fine.
Just wanted to share this piece of info to whomever may need it.
If you get a connection string error, and after checking the actual validity of the string you're still stuck having problems with migration, you might want to try and set in the solution as start up project the project that the DB is updated from (and setup the connection string there like it should be).
Apparently VS uses the config file of the start up project.
Hope this helps.
Related
I am at a new role, and am trying to get started with the Visual Studio solution I will be working on - I am having an issue with the sqlproj within the solution - which is required to get my local instance up and running!
The issue is the publish step - I get the error "Could not find the file c:\Repos<whatever>\debug\bin\Site.dacpac.
Several different sources have suggested simply doing a Rebuild of the project, but VS always skips this project - even if I try a Clean first, or Clean the entire solution and Build after.
I have checked that the build is currently set to produce Debug code, and confirmed the project is set to be built in the Debug/All CPUs configuration.
Is there a way to force it to rebuild?
The only thing that I can think of is that the instructions I'm following request the developer to install SQL Server 2017, but I'd already installed SQL Server 2019 - could there be an issue there?
Resolved: for some reason the sql project didn't want to work with SQL 2019,
so I uninstalled that, and replaced with SQL 2017, and it worked.
I had expected '19 to be backwards compatible with '17, but apparently not.
Can someone help me with this problem??. I want use "Reverse Engineering Code First" with entity framework used MySQL. I was installed odbc, connector .net etc but still I cant see this... I did everything in this topic (and I have this same problem): Can't use a MySQL connection for entity framework 6
but still doesnt work :(. I was record all steps what I do it.. (Sry for english): https://youtu.be/xqEgCsu7_eU
I've gotten it to work with MySql Connector 6.9.11. Its so darned difficult and fragile I'm not sure if it was ultimately a good idea. There are at least 10 things that can go wrong and suck up hours of time. Once you get it working be very careful to not change anything. Anyhow. Here's some of my notes:
WARNING use with MySQL server 5.6.39 or 5.7.19. Do NOT use MySQL server version 5.7.21 (it fails with reverse eng) Aurora seems ok.
Install "mysql-connector-net-6.9.11.msi". There seems to be a problem with newer MySQL Connector 6.10 ?? use older 6.9.11. MUST INSTALL VIA msi file. Having the local file is not enough.
Install "mysql-for-visualstudio-1.2.8.msi" or "mysql-for-visualstudio-1.2.7.msi" ? NOTE: 1.2.7 will never uninstall correctly. VS 2015 seems to require "MySQL for Visual Studio" for EF Poco to work, (Pro,Enterprise are different)
Must have "Entity Framework Power tools Beta 4" installed as a plugin to Visual Studio 2013. Its takes some effort to get it to install for 2015, 17 but it can be done.
https://visualstudiogallery.msdn.microsoft.com/72a60b14-1581-4b9b-89f2-846072eff19d
Things that can go wrong:
ISSUE 1:
you get error "One or more errors occurred while processing template 'Entity.tt'."
This ALWAYS happens the first time i use reverse engineer after restarting VS.
Simply changing the .NET assemmbly version seems to do the trick. Target .NET 4.5 (not 4.5.1) for reverse engineer.
use .net4.5 for EF. If you see exception "System.ArgumentException: Empty path name is not legal."
remember to change back to 4.5.2 or greater.
VS2015 Edit and Continue is supported for 64-bit projects that target the .NET Framework 4.5.1. (or 4.5.2)
ISSUE 2:
System.ArgumentException: The specified store provider 'MySql.Data.MySqlClient' cannot be found in the configuration, or 'MySql.Data.MySqlClient' is not valid.
This appears to be an app/web.config issue.
??? MySql.Data.MySqlClient has more than 1 entry in in app.config ?? or bindingRedirect is wrong ?? might be wrong version consistently 6.9.11 ? MySql.Data.MySqlClient
?? Install correct version 6.9.11 in GAC not just nuget ? mysql-connector-net-6.9.11.msi
ISSUE 3:
MySQL issue - "error 6003: The value for column 'IsPrimaryKey' in table 'TableDetails' is DBNull." Specified cast is not valid.
[1 Jan 2016 15:27] "Noman Khan. Run the following command on the MySQL DB and then try if this works. set global optimizer_switch='derived_merge=off'" (on the user you will use. i.e root)
ISSUE 4:
Out of memory execption. Restart VisualStudio.
ISSUE 5:
If "MySQL" option doesnt display in the "Change Data source" listbox. Install the Visual Studio MySQL Plugin
Can't use a MySQL connection for entity framework 6
NOTE:
EntityFrameworkPowerToolsBeta4 is not built for VS2015 or 17. The installer version must be modified for it to install
How to use Entity Framework Power Tools in Visual Studio 2015?
http://thedatafarm.com/data-access/installing-ef-power-tools-into-vs2015/
NOTE:
You can view the Generated SQL query by debugging/break on the object prior to deferred execution of the query.
You can Use Aliases to map to other db's
Watch out for poor pluralization rules like "Statu" to "Status"
Check out https://us.visualstudiogallery.msdn.microsoft.com/ee4fcff9-0c4c-4179-afd9-7a2fb90f5838/view/Discussions
This seems to be more configurable and better supported. But only works for MSSQL?
I am trying to debug a program using Entity Framework code first on my personal (work) computer.
We have recently had a domain migration, meaning that the user I log in as now is not the same that I used before. This caused me to loose access to the databases I had on the computer. To get around this, I have uninstalled everything to do with Microsoft SQL Server on the computer, and installed the latest version of Microsoft SQL Server, 2014 - 12.0.4213.0 . I then restored the database I need.
When I first tried to run the program, Visual Studio complained that the project is set up to use SQL Server Express, which was not installed. The recommended solution is to change the project to use SQL Server instead. To do this, I must click on "the database file" and follow the instructions. I have looked through the entire solution. There is a great many files, but I found no good candidate for "the database file."
It seems that my Google fu is not strong enough to find anything about this. So my question is: how do I change the project to use SQL Server?
I also have a second, related question. I tried to solve the problem by installing SQL Server Express. However, when I try to restore the database to this, no base appears in the drop down list. When I try to run the program now, I get another error:
Unable to create the file 'c:\Program Files\Microsoft SQL Server\MSSQL11.SQLEXPRESS\MSSQL\DATA\Timelønsblanket.mdf' because it already exists.
I guess that this is also why I cannot restore the database. What I have found in websearches warns that I should not manually delete .mdf files.
Any advice on what to do?
I have solved the problem. All that was needed was a correct connection string. No need to find a "database file".
It looks like CodeFirst stops doing its homework when it doesn't have full control of the database (I suppose).
The scenario is a web site hosted on Arvixe.com (or I suppose any other shared hosting server), where I have to create databases only from their control panel (and NOT with Sql Server Management Studio, just to say...).
Once created an empty database, I register a connection in the web site, and I use it to generate database from poco objects like in:
add-migration m1 -targetdatabase myconnection
This generates correctly my FIRST migration, that I can apply without problems with
update-database -targetdatabase myconnection
The first concern, not too important, is that since the database is existing, it will NOT issue the Seed command, so I have to insert my first records by hand, but this is not a great problem.
Then I change my poco objects, and I need to update the database, but when I issue ANOTHER
add-migration m2 -targetdatabase myconnection
it gives the error:
System.Data.Entity.Migrations.MigrationsPendingException: Unable to generate an explicit migration because the following explicit migrations are pending: [201111081426466_m1]. Apply the pending explicit migrations before attempting to generate a new explicit migration.
This is really strange, since if I look at the database, I can see even the table __MigrationHistory, but then it looks like it cannot recognize it...
Anyone with the same problem, or some good tip to where investigate?
Thanks in advance,
Andrea Bioli
I had this problem. I was able to resolve it by providing a connectionString and a connectionProviderName parameter to both the Update-Database and the Add-Migration commands.
If you have many projects in your solution with multiple config files, Package Manager seems to be confused. In my case, I had one project selected as the default project for Package Manager Console, but it was pulling the connection string from the Visual Studio solution default start-up project instead.
I am trying to do some tests using EF4 + CTP5 with code first development by writing POCO classes and have faced the following problems
Connecting to existing database throws me the exception:
Model compatibility cannot be checked because the database does not contain model metadata
While I can create a new database from code by giving a new file name in a connection string, not able to open the file (database) using the Management Studio after running few tests against, the Management studio doesn't allow to add the file when trying to attach the database with no specific error detail provided.
For #1, did you try adding the following to your global.asax?
Database.SetInitializer<CustomContextNameHere>(null);
where "CustomContextNameHere" is your context object.
As far as #2 goes, I am assuming you mean the default ASPNETDB.MDF file. Have you tried opening the file with the Server Explorer in VS? It may open right up if you double-click on it in the solution.