Question

启动使用HangFire（1.6.22）和PostgreSQL的进程时，我们会看到此错误。

2019-03-19 00:12:45,406 [1] ERROR
Hangfire.PostgreSql.PostgreSqlStorage [(null)] - Error while executing install/upgrade Npgsql.PostgresException (0x80004005): 42701: column "updatecount" of relation "lock" already exists
    at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<<ReadMessage>g__ReadMessageLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
    at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
    at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<<ReadMessage>g__ReadMessageLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
    at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
    at Npgsql.NpgsqlDataReader.<NextResult>d__46.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
    at Npgsql.NpgsqlDataReader.NextResult()
    at Npgsql.NpgsqlCommand.<ExecuteDbDataReader>d__100.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
    at Npgsql.NpgsqlCommand.<ExecuteNonQuery>d__92.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
    at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
    at Npgsql.NpgsqlCommand.ExecuteNonQuery()

Answer 1

固定。这可能会对其他人有所帮助。

真正的问题是，当我们为HangFire创建表时，它是使用源存储库中可用的SQL脚本创建的。并且在运行代码时，它发现一些不匹配的内容并自动尝试更新数据库表，但失败了。

因此，我们删除了所有表，并让HangFire在首次运行时创建表。现在工作正常。

为什么HangFire启动过程失败并显示此错误？

1 个答案: