I am trying to set up an C#/ASP.NET
project. I am using .Net 9.0.102
, VS Code
as the IDE and MySql
for the database. I installed the Entity Framework, configured the ApplicationDbContext.cs
file, and set my database connection string in appsettings.json
.
I ran the command dotnet ef migrations add IntialCreate --startup-project examSystem --project examSystem
without any issue. My migration file is present along with the ..._InitialCreate.cs file. I then ran the command dotnet ef database update --startup-project examSystem --project examSystem
and get the fatal error message.
I don't understand the error message I am receiving and therefore have no clue how to about fixing it.
Here is the error message.
Build started...
Build succeeded.
info: Microsoft.EntityFrameworkCore.Migrations[20411]
Acquiring an exclusive lock for migration application. See https://aka.ms/efcore-docs-migrations-lock for more information if this takes too long.
Acquiring an exclusive lock for migration application. See https://aka.ms/efcore-docs-migrations-lock for more information if this takes too long.
fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
Failed executing DbCommand (8ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
DECLARE @result int;EXEC @result = sp_getapplock @Resource = '__EFMigrationsLock', @LockOwner = 'Session', @LockMode = 'Exclusive';SELECT @result
Failed executing DbCommand (8ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
DECLARE @result int;EXEC @result = sp_getapplock @Resource = '__EFMigrationsLock', @LockOwner = 'Session', @LockMode = 'Exclusive';SELECT @result
fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
Failed executing DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
DECLARE @result int;EXEC @result = sp_releaseapplock @Resource = '__EFMigrationsLock', @LockOwner = 'Session';SELECT @result
Failed executing DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
DECLARE @result int;EXEC @result = sp_releaseapplock @Resource = '__EFMigrationsLock', @LockOwner = 'Session';SELECT @result
MySql.Data.MySqlClient.MySqlException (0x80004005): Fatal error encountered during command execution
---> MySql.Data.MySqlClient.MySqlException (0x80004005): Parameter '@result' must be defined
at MySql.Data.MySqlClient.Statement.SerializeParameterAsync(MySqlParameterCollection parameters, MySqlPacket packet, String parmName, Int32 parameterIndex, Boolean execAsync)
at MySql.Data.MySqlClient.Statement.InternalBindParametersAsync(String sql, MySqlParameterCollection parameters, MySqlPacket packet, Boolean execAsync)
at MySql.Data.MySqlClient.Statement.BindParametersAsync(Boolean execAsync)
at MySql.Data.MySqlClient.Statement.ExecuteAsync(Boolean execAsync)
at MySql.Data.MySqlClient.PreparableStatement.ExecuteAsync(Boolean execAsync)
at MySql.Data.MySqlClient.MySqlCommand.ExecuteReaderAsync(CommandBehavior behavior, Boolean execAsync, CancellationToken cancellationToken)
at MySql.Data.MySqlClient.MySqlCommand.ExecuteReaderAsync(CommandBehavior behavior, Boolean execAsync, CancellationToken cancellationToken)
at MySql.Data.MySqlClient.MySqlCommand.ExecuteReaderAsync(CommandBehavior behavior, Boolean execAsync, CancellationToken cancellationToken)
at MySql.Data.MySqlClient.MySqlCommand.ExecuteScalarAsync(Boolean execAsync, CancellationToken cancellationToken)
at MySql.Data.MySqlClient.MySqlCommand.ExecuteScalar()
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteScalar(RelationalCommandParameterObject parameterObject)
at MySql.EntityFrameworkCore.Migrations.Internal.MySQLHistoryRepository.AcquireDatabaseLock()
at MySql.EntityFrameworkCore.Migrations.Internal.MySQLMigrator.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.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
Fatal error encountered during command execution
Here is my Model with the class to be created in the database.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace examSystem.Models;
public class Questions
{
public int Id { get; set; }
public required string Subject {get; set;}
public required string ExamQuestion{ get; set; }
public required string AnswerOption { get; set; }
public required string CorrectAnswer { get; set; }
public Questions()
{
//constructor
}
}
Here is my ApplicationDbContext.
using System;
using System.Collections.Generic;
using System.Text;
using examSystem.Models;
using Microsoft.EntityFrameworkCore;
namespace examSystem.Data
{
public class ApplicationDbContext : DbContext
{
public ApplicationDbContext(DbContextOptions options) : base(options)
{
}
public DbSet<Questions> Questions { get; set; }
}
}
I have not tired anything. I am not understanding the error so I don't know what to try to begin to solve this. I have Googled but what is coming up are stuff pertaining to errors relating to wrong datatype or syntax and not the issue that I am facing.
My expectation is that the database table would have been created and showing in my database.
I had the same problem
sp_getapplock refers to SqlServer, which suggest that there is a problem with MySql.EntityFrameworkCore 9.0.0
I saw 2 solutions: 1- Use pre-release version of Pomelo.EntityFrameworkCore.MySql 2- Go back to EF 8
To play safe in prod, I choose option 2