asp.net core 3.1+mysql8.0+Hangfire遇到的异常解决记

Hangfire大家都很熟了,在.net 下用处很多,最近在asp.net core 3.1 使用hangfire的过程中,遇到很多问题,现在记录下来,分享给下一位。

1.现在的开发环境:

asp.net core 3.1
hangfire.aspnetcore 1.7.9
mysql 8.0.12
hangfire.mysql.core 2.2.5

2.遇到的第一个异常解决:

{"code":401,"data":"","message":"Parameter '@rownum' must be defined. To use this as a variable, set 'Allow User Variables=true' in the connection string."}

这个我查了一些资料,解决办法是在连接字符串添加AllowUserVariables=True;得以解决
你的连接字符串看起来应该像这样:

Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;
AllowUserVariables=True;    

网上搜索到的,有提示变量为Allow User Variables=true(注意中间有空格),经我实践是不行的,需要使用AllowUserVariables=True;(中间没有空格) 这样的方式。

3.遇到下面的类似的异常:

{"code":401,"data":"","message":"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'rank\r\n\t    from `Hangfire_Set`,\r\n            (select @rownum := 0) r \r\n        w' at line 3"}

经查,原来我们是引用:Hangfire.MySqlStorage
这个库来实现mysql版本下的hangfire数据持久化。这个库现在已经不实用了。

建议换成:

Hangfire.MySql.Core

这个库

4.换成以上库以后,使用方式如下:

services.AddHangfire(x => x.UseStorage(new MySqlStorage(Configuration.GetConnectionString("Hangfire"),new MySqlStorageOptions(){TablePrefix = "Custom"})));

支持表前缀为custom,不需要添加下划线,表会自动创建custom_的表。

5.以下异常:
MySqlException: Table ' custom__distributedlock' doesn't exist
要注意,表脚本要跟着修改一下:
从原来12张表新增了一张表,变为13张表,
增加了表:DistributedLock

github上有脚本,为了方便大家,我把脚本贴一下,直接用这个修改就可以了:


-- ----------------------------
-- Table structure for `Job`
-- ----------------------------
CREATE TABLE `_Job` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `StateId` int(11) DEFAULT NULL,
  `StateName` varchar(20) DEFAULT NULL,
  `InvocationData` longtext NOT NULL,
  `Arguments` longtext NOT NULL,
  `CreatedAt` datetime NOT NULL,
  `ExpireAt` datetime DEFAULT NULL,
  PRIMARY KEY (`Id`),
  KEY `IX_Job_StateName` (`StateName`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;


-- ----------------------------
-- Table structure for `Counter`
-- ----------------------------
CREATE TABLE `_Counter` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `Key` varchar(100) NOT NULL,
  `Value` int(11) NOT NULL,
  `ExpireAt` datetime DEFAULT NULL,
  PRIMARY KEY (`Id`),
  KEY `IX_Counter_Key` (`Key`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;


CREATE TABLE `_AggregatedCounter` (
    Id int(11) NOT NULL AUTO_INCREMENT,
    `Key` varchar(100) NOT NULL,
    `Value` int(11) NOT NULL,
    ExpireAt datetime DEFAULT NULL,
    PRIMARY KEY (`Id`),
    UNIQUE KEY `IX_CounterAggregated_Key` (`Key`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;


-- ----------------------------
-- Table structure for `DistributedLock`
-- ----------------------------
CREATE TABLE `_DistributedLock` (
  `Resource` varchar(100) NOT NULL,
  `CreatedAt` datetime NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;


-- ----------------------------
-- Table structure for `Hash`
-- ----------------------------
CREATE TABLE `_Hash` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `Key` varchar(100) NOT NULL,
  `Field` varchar(40) NOT NULL,
  `Value` longtext,
  `ExpireAt` datetime DEFAULT NULL,
  PRIMARY KEY (`Id`),
  UNIQUE KEY `IX_Hash_Key_Field` (`Key`,`Field`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;


-- ----------------------------
-- Table structure for `JobParameter`
-- ----------------------------
CREATE TABLE `_JobParameter` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `JobId` int(11) NOT NULL,
  `Name` varchar(40) NOT NULL,
  `Value` longtext,

  PRIMARY KEY (`Id`),
  CONSTRAINT `IX_JobParameter_JobId_Name` UNIQUE (`JobId`,`Name`),
  KEY `FK_JobParameter_Job` (`JobId`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ----------------------------
-- Table structure for `JobQueue`
-- ----------------------------
CREATE TABLE `_JobQueue` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `JobId` int(11) NOT NULL,
  `Queue` varchar(50) NOT NULL,
  `FetchedAt` datetime DEFAULT NULL,
  `FetchToken` varchar(36) DEFAULT NULL,
  
  PRIMARY KEY (`Id`),
  INDEX `IX_JobQueue_QueueAndFetchedAt` (`Queue`,`FetchedAt`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ----------------------------
-- Table structure for `JobState`
-- ----------------------------
CREATE TABLE `_JobState` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `JobId` int(11) NOT NULL,
  `Name` varchar(20) NOT NULL,
  `Reason` varchar(100) DEFAULT NULL,
  `CreatedAt` datetime NOT NULL,
  `Data` longtext,
  PRIMARY KEY (`Id`),
  KEY `FK_JobState_Job` (`JobId`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ----------------------------
-- Table structure for `Server`
-- ----------------------------
CREATE TABLE `_Server` (
  `Id` varchar(100) NOT NULL,
  `Data` longtext NOT NULL,
  `LastHeartbeat` datetime DEFAULT NULL,
  PRIMARY KEY (`Id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;


-- ----------------------------
-- Table structure for `Set`
-- ----------------------------
CREATE TABLE `_Set` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `Key` varchar(100) NOT NULL,
  `Value` varchar(256) NOT NULL,
  `Score` float NOT NULL,
  `ExpireAt` datetime DEFAULT NULL,
  PRIMARY KEY (`Id`),
  UNIQUE KEY `IX_Set_Key_Value` (`Key`,`Value`)
) ENGINE=InnoDB  CHARSET=utf8mb4;



CREATE TABLE `_State`
(
    Id int(11) NOT NULL AUTO_INCREMENT,
    JobId int(11) NOT NULL,
    Name varchar(20) NOT NULL,
    Reason varchar(100) NULL,
    CreatedAt datetime NOT NULL,
    Data longtext NULL,
    PRIMARY KEY (`Id`),
    KEY `FK_HangFire_State_Job` (`JobId`)
) ENGINE=InnoDB  CHARSET=utf8mb4;

CREATE TABLE `_List`
(
    `Id` int(11) NOT NULL AUTO_INCREMENT,
    `Key` varchar(100) NOT NULL,
    `Value` longtext NULL,
    `ExpireAt` datetime NULL,
    PRIMARY KEY (`Id`)
) ENGINE=InnoDB  CHARSET=utf8mb4;

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