Entity Framework Core 6 Problem
-
Yes. The examples I followed show it there. Isn't that what OnConfiguring does? A one time set up?
If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.
In a production environment, you would NEVER hardcode a connection string. This would prevent you from developing against a dev version of the database and testing code and migrations without impacting the production database. Read the entire section on Migrations, not just the Overview: Migrations Overview - EF Core | Microsoft Learn[^]
Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave Kreskowiak -
In a production environment, you would NEVER hardcode a connection string. This would prevent you from developing against a dev version of the database and testing code and migrations without impacting the production database. Read the entire section on Migrations, not just the Overview: Migrations Overview - EF Core | Microsoft Learn[^]
Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave KreskowiakYa, I Put it there just for testing. Thanks for all your help
If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.
-
This works differently from the older Entity Frameworks. The reason you're getting the login failure is because the database does not exist in SQLEXPRESS yet. You cannot create the database just by running the code you have, as is. You first have to enable migrations in the project, then create your first migration ("InitialCreate"). Once that is done, you can add the following line your program:
using (var db = new ModelContext())
{
// Update the database to the latest migration
db.Database.Migrate();// Creating a new department and save it to the database var newDept = new Departments(); newDept.DepartmentId = 1; newDept.DepartmentName = "Development";I highly recommend AGAINST doing this! You are far better off managing and applying migrations using the EF command line tools! You can EASILY make a mistake that will destroy a production database just by running your code at the wrong time and with the wrong connection string! Migrations Overview - EF Core | Microsoft Learn[^] On top of that, there's a few mistakes in your code in your initial post above. For example, every DbSet should be DbSet<type> ...
public virtual DbSet Departments { get; set; } public virtual DbSet Employees { get; set; }...and there are mispellings in your modelBuilder code, like
entity.ToTable(**"Employees"**, "public");Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave KreskowiakThanks alot!
If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.
-
This works differently from the older Entity Frameworks. The reason you're getting the login failure is because the database does not exist in SQLEXPRESS yet. You cannot create the database just by running the code you have, as is. You first have to enable migrations in the project, then create your first migration ("InitialCreate"). Once that is done, you can add the following line your program:
using (var db = new ModelContext())
{
// Update the database to the latest migration
db.Database.Migrate();// Creating a new department and save it to the database var newDept = new Departments(); newDept.DepartmentId = 1; newDept.DepartmentName = "Development";I highly recommend AGAINST doing this! You are far better off managing and applying migrations using the EF command line tools! You can EASILY make a mistake that will destroy a production database just by running your code at the wrong time and with the wrong connection string! Migrations Overview - EF Core | Microsoft Learn[^] On top of that, there's a few mistakes in your code in your initial post above. For example, every DbSet should be DbSet<type> ...
public virtual DbSet Departments { get; set; } public virtual DbSet Employees { get; set; }...and there are mispellings in your modelBuilder code, like
entity.ToTable(**"Employees"**, "public");Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave KreskowiakOK, so I went through the Migrations Oerview and installed the necessary packages. I then ran Add Migration and Update Database. Now I get this
Applying migration '20221127185110_Initial'.
Failed executing DbCommand (2ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
IF SCHEMA_ID(N'public') IS NULL EXEC(N'CREATE SCHEMA [public];');
Microsoft.Data.SqlClient.SqlException (0x80131904): There is already an object named 'public' in the database.
CREATE SCHEMA failed due to previous errors.
at Microsoft.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at Microsoft.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at Microsoft.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
at Microsoft.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean isAsync, Int32 timeout, Boolean asyncWrite)
at Microsoft.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry, String methodName)
at Microsoft.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteNonQuery(RelationalCommandParameterObject parameterObject)
at Microsoft.EntityFrameworkCore.Migrations.MigrationCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery(IEnumerable`1 migrationCommands, IRelationalConnection connection)
at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String connectionString, String contextType)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String connectionString, String contextType)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0()
at Microsoft.EntityFrameworkC -
OK, so I went through the Migrations Oerview and installed the necessary packages. I then ran Add Migration and Update Database. Now I get this
Applying migration '20221127185110_Initial'.
Failed executing DbCommand (2ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
IF SCHEMA_ID(N'public') IS NULL EXEC(N'CREATE SCHEMA [public];');
Microsoft.Data.SqlClient.SqlException (0x80131904): There is already an object named 'public' in the database.
CREATE SCHEMA failed due to previous errors.
at Microsoft.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at Microsoft.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at Microsoft.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
at Microsoft.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean isAsync, Int32 timeout, Boolean asyncWrite)
at Microsoft.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry, String methodName)
at Microsoft.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteNonQuery(RelationalCommandParameterObject parameterObject)
at Microsoft.EntityFrameworkCore.Migrations.MigrationCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery(IEnumerable`1 migrationCommands, IRelationalConnection connection)
at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String connectionString, String contextType)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String connectionString, String contextType)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0()
at Microsoft.EntityFrameworkCChange "public" to "dbo" in your code. Where did you find this tutorial you're following? The problem with Linq-To-Sql is that it is a dead product and no longer under development.
Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave Kreskowiak -
Change "public" to "dbo" in your code. Where did you find this tutorial you're following? The problem with Linq-To-Sql is that it is a dead product and no longer under development.
Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave KreskowiakDave Kreskowiak wrote:
Where did you find this tutorial you're following?
I have the book I mentioned in my other reply, as well as a couple of YouTube vids I followed.
Dave Kreskowiak wrote:
The problem with Linq-To-Sql is that it is a dead product and no longer under development.
Yup. Thats why I'm doing this.
If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.
-
Change "public" to "dbo" in your code. Where did you find this tutorial you're following? The problem with Linq-To-Sql is that it is a dead product and no longer under development.
Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave KreskowiakOK, I think I have this now. I did the migration and update, and the DB was created and Department and Employee tables added. Next, I added a Companies entity, linked it to Departments, and ran
dotnet ef migrations add AddCompanies
dotnet ef database updateand the Db is now up to date. So I need to run these 2 commands each time I make a change?
If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.
-
OK, I think I have this now. I did the migration and update, and the DB was created and Department and Employee tables added. Next, I added a Companies entity, linked it to Departments, and ran
dotnet ef migrations add AddCompanies
dotnet ef database updateand the Db is now up to date. So I need to run these 2 commands each time I make a change?
If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.
Yes. You can make a ton of changes and wrap them all in a single migration. Open the migration file and take a look at what's generated.
Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave Kreskowiak -
Yes. You can make a ton of changes and wrap them all in a single migration. Open the migration file and take a look at what's generated.
Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave KreskowiakOK, I get it now. That book I referenced doesn't show any of this, so far. Now I get why nothing was happening when I ran my console app. I was under the impression that creating the DBContext would do all of this
If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.
-
Yes. You can make a ton of changes and wrap them all in a single migration. Open the migration file and take a look at what's generated.
Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave KreskowiakHow do you get a Prod DB update to date with all the migration changes?
If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.