如何使用Mysql存储配置Hangfire

我有一个使用ASP.NET CORE开发的web应用程序，我想每周向客户发送时事通讯。环顾四周后，我认为Hangfire将是我使用的一个好工具。 不幸的是，我似乎无法使用Mysql数据库使其工作。它与InMemboryStorage完美配合

下面是我的设置

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，但当我尝试创建后台作业时，。我得到一个错误，上面写着“hangfire_状态表不存在”

下面是我在启动时的配置，以及错误的堆栈跟踪。 如果你知道为什么会这样，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");
        }

下面是错误

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,

MySqlException:表'hangfire.hangfire_state'不存在
MySqlDataReader.cs中的MySql.Data.MySqlClient.MySqlDataReader.ActivateResultSet（）
MySqlDataReader.cs中的MySql.Data.MySqlClient.MySqlDataReader.CreateAsync（CommandListPosition CommandListPosition、ICommandPayloadCreator payloadCreator、IDictionary CachedProcess、IMySqlCommand命令、CommandBehavior行为、IOBehavior、CancellationToken CancellationToken）
CommandExecutor.cs中的MySqlConnector.Core.CommandExecutor.ExecuteReaderAsync（IReadOnlyList命令、ICommandPayloadCreator payloadCreator、CommandBehavior行为、IOBehavior IOBehavior、CancellationToken CancellationToken CancellationToken）
MySqlCommand.cs中的MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQueryAsync（IOBehavior IOBehavior，CancellationToken CancellationToken）
MySqlCommand.cs中的MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery（）
SqlMapper.cs中的Dapper.SqlMapper.ExecuteCommand（IDbConnection cnn，ref CommandDefinition命令，Action paramReader）
SqlMapper.cs中的Dapper.SqlMapper.ExecuteImpl（IDbConnection cnn，ref CommandDefinition命令）
SqlMapper.cs中的Dapper.SqlMapper.Execute（IDbConnection cnn、字符串sql、对象参数、IDbTransaction transaction、Nullable commandTimeout、Nullable commandType）
Hangfire.MySql.Core.MySqlWriteOnlyTransaction+c__显示类7_0.b__0（MySqlConnection x）
Hangfire.MySql.Core.MySqlWriteOnlyTransaction.b_uu30_0（MySqlConnection）
Hangfire.MySql.Core.MySqlStorage+c__显示类19_0.b__0（MySqlConnection）
Hangfire.MySql.Core.MySqlStorage+c__显示类20_0.b__0（MySqlConnection）
Hangfire.MySql.Core.MySqlStorage.UseConnection（Func-Func）
Hangfire.MySql.Core.MySqlStorage.usetransation（Func-Func，可空的isolationLevel）
Hangfire.MySql.Core.MySqlStorage.UseTransaction（操作）
Hangfire.Client.CoreBackgroundJobFactory+c_uuuuDisplayClass14_0.b_uuu3（int尝试）
Hangfire.Client.CoreBackgroundJobFactory+c_uuuuDisplayClass15_0.b_uu0（int尝试）
Hangfire.Client.CoreBackgroundJobFactory.RetryOneException（ref int attemptsLeft，Func action）
Hangfire.Client.CoreBackgroundJobFactory.RetryOneException（ref int attemptsLeft，Func action）
Hangfire.Client.CoreBackgroundJobFactory.RetryOneException（ref int attempsleft，Action-Action）
Hangfire.Client.CoreBackgroundJobFactory.Create（CreateContext上下文）
Hangfire.Client.BackgroundJobFactory+c_uuuuDisplayClass12_0.b_uuu0（）
Hangfire.Client.BackgroundJobFactory.InvokeClientFilter（IClientFilter筛选器、CreatingContext预文本、Func continuation）
Hangfire.Client.BackgroundJobFactory.Create（CreateContext上下文）
Hangfire.BackgroundJobClient.Create（作业、IState状态、，

您需要在

启动

配置中初始化属性

prepareschemaifrequired=true

通过以下选项：

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);