如何使用 Mysql 存储配置 Hangfire

Question

我有一个使用 ASP.NET CORE 开发的 Web 应用程序，我想向我的客户发送每周时事通讯。环顾四周后，我认为 Hangfire 会是我使用的好工具。 不幸的是，我似乎无法使用 Mysql 数据库让它工作。它与 InMemboryStorage 完美配合。

以下是我的设置。

ASP.NET 核心 2.2

Hangfire 1.7.8

Hangfire.Mysql.Core 2.2.5

Hangfire 在数据库中创建了大约 9 个表，但是当我尝试创建后台作业时，。我收到一条错误消息，提示“hangfire_state 表不存在”。

下面是我在启动时的配置，以及错误的堆栈跟踪。 如果您知道为什么会这样，请帮忙。

谢谢！

services.AddHangfire(cfg =>
            {
//                cfg.UseMemoryStorage();
                cfg.UseStorage(new MySqlStorage(
                    "server=localhost; database=hangfire; password=''; uid=root; port=3306; Allow User Variables=True"));
            });

为测试创建后台作业的控制器操作

[HttpGet("/hagnfire-test")]
        public IActionResult TestHangfire()
        {
            BackgroundJob.Enqueue(() => Console.WriteLine("Hangfire works!"));

            return Ok("Hangfire test");
        }

以下是错误；

MySqlException: Table 'hangfire.hangfire_state' doesn't exist
MySqlConnector.Core.ResultSet.ReadResultSetHeaderAsync(IOBehavior ioBehavior) in ResultSet.cs, line 49

MySqlException: Table 'hangfire.hangfire_state' doesn't exist
MySql.Data.MySqlClient.MySqlDataReader.ActivateResultSet() in MySqlDataReader.cs, line 116

BackgroundJobClientException: Background job creation failed. See inner exception for details.
Hangfire.BackgroundJobClient.Create(Job job, IState state)

堆栈跟踪

MySqlException: Table 'hangfire.hangfire_state' doesn't exist
MySql.Data.MySqlClient.MySqlDataReader.ActivateResultSet() in MySqlDataReader.cs
MySql.Data.MySqlClient.MySqlDataReader.CreateAsync(CommandListPosition commandListPosition, ICommandPayloadCreator payloadCreator, IDictionary<string, CachedProcedure> cachedProcedures, IMySqlCommand command, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in MySqlDataReader.cs
MySqlConnector.Core.CommandExecutor.ExecuteReaderAsync(IReadOnlyList<IMySqlCommand> commands, ICommandPayloadCreator payloadCreator, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in CommandExecutor.cs
MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQueryAsync(IOBehavior ioBehavior, CancellationToken cancellationToken) in MySqlCommand.cs
MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery() in MySqlCommand.cs
Dapper.SqlMapper.ExecuteCommand(IDbConnection cnn, ref CommandDefinition command, Action<IDbCommand, object> paramReader) in SqlMapper.cs
Dapper.SqlMapper.ExecuteImpl(IDbConnection cnn, ref CommandDefinition command) in SqlMapper.cs
Dapper.SqlMapper.Execute(IDbConnection cnn, string sql, object param, IDbTransaction transaction, Nullable<int> commandTimeout, Nullable<CommandType> commandType) in SqlMapper.cs
Hangfire.MySql.Core.MySqlWriteOnlyTransaction+<>c__DisplayClass7_0.<SetJobState>b__0(MySqlConnection x)
Hangfire.MySql.Core.MySqlWriteOnlyTransaction.<Commit>b__30_0(MySqlConnection connection)
Hangfire.MySql.Core.MySqlStorage+<>c__DisplayClass19_0.<UseTransaction>b__0(MySqlConnection connection)
Hangfire.MySql.Core.MySqlStorage+<>c__DisplayClass20_0<T>.<UseTransaction>b__0(MySqlConnection connection)
Hangfire.MySql.Core.MySqlStorage.UseConnection<T>(Func<MySqlConnection, T> func)
Hangfire.MySql.Core.MySqlStorage.UseTransaction<T>(Func<MySqlConnection, T> func, Nullable<IsolationLevel> isolationLevel)
Hangfire.MySql.Core.MySqlStorage.UseTransaction(Action<MySqlConnection> action)
Hangfire.Client.CoreBackgroundJobFactory+<>c__DisplayClass14_0.<Create>b__3(int attempt)
Hangfire.Client.CoreBackgroundJobFactory+<>c__DisplayClass15_0.<RetryOnException>b__0(int attempt)
Hangfire.Client.CoreBackgroundJobFactory.RetryOnException<T>(ref int attemptsLeft, Func<int, T> action)
Hangfire.Client.CoreBackgroundJobFactory.RetryOnException<T>(ref int attemptsLeft, Func<int, T> action)
Hangfire.Client.CoreBackgroundJobFactory.RetryOnException(ref int attemptsLeft, Action<int> action)
Hangfire.Client.CoreBackgroundJobFactory.Create(CreateContext context)
Hangfire.Client.BackgroundJobFactory+<>c__DisplayClass12_0.<CreateWithFilters>b__0()
Hangfire.Client.BackgroundJobFactory.InvokeClientFilter(IClientFilter filter, CreatingContext preContext, Func<CreatedContext> continuation)
Hangfire.Client.BackgroundJobFactory.Create(CreateContext context)
Hangfire.BackgroundJobClient.Create(Job job, IState state,

Answer 1

您需要在StartUp 配置中初始化属性PrepareSchemaIfNecessary = true。

传递以下选项：

var options =
new MySqlStorageOptions {
    TransactionIsolationLevel = IsolationLevel.ReadCommitted,
    QueuePollInterval = TimeSpan.FromSeconds(15),
    JobExpirationCheckInterval = TimeSpan.FromHours(1),
    CountersAggregateInterval = TimeSpan.FromMinutes(5),
    PrepareSchemaIfNecessary = true,
    DashboardJobListLimit = 50000
};
var storage = new MySqlStorage(connectionString, options);