asp.net - Fatal error encountered during command execution when using command dotnet ef database update - Stack Overflow

admin管理员组

文章数量:1297111

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  for more information if this takes too long.
Acquiring an exclusive lock for migration application. See  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 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.

• asp
• entity-framework-migrations

Share Follow asked Feb 11 at 23:08 Wanabe Super CoderWanabe Super Coder 18522 silver badges1717 bronze badges

Add a comment  | 

1 Answer 1

Sorted by: Reset to default 0

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

本文标签：