HangfireOracle10g报错“名称已由现有对象使⽤”Hangfire Oracle 10g报错“名称已由现有对象使⽤”
结论
⾸先给出结论中的初始化数据库的脚本Install.sql中⽤了“LOB”（Oracle 11g⽀持），不⽀持Oracle 10g。
解决⽅案
提前⽤脚本创建Hangfire所需要的表结构，这是我修改好的初始化数据库的脚本。如下：
CREATE SEQUENCE HF_SEQUENCE START WITH 1 MAXVALUE 9999999999999999999999999999 MINVALUE 1 NOCYCLE CACHE 20 NOORDER;
CREATE SEQUENCE HF_JOB_ID_SEQ START WITH 1 MAXVALUE 9999999999999999999999999999 MINVALUE 1 NOCYCLE CACHE 20 NOORDER;
-- ----------------------------
-- Table structure for `Job`
-- ----------------------------
CREATE TABLE HF_JOB (ID                NUMBER (10)
,STATE_ID          NUMBER (10)
,STATE_NAME        NVARCHAR2 (20)
,INVOCATION_DATA  NCLOB
,ARGUMENTS        NCLOB
,CREATED_AT        TIMESTAMP (4)
,EXPIRE_AT        TIMESTAMP (4))
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE HF_JOB ADD (
PRIMARY KEY
(ID)
USING INDEX
ENABLE VALIDATE);
-- ----------------------------
-- Table structure for `Counter`
-- ----------------------------
CREATE TABLE HF_COUNTER (ID          NUMBER (10)
,KEY        NVARCHAR2 (255)
,
VALUE      NUMBER (10)
,EXPIRE_AT  TIMESTAMP (4))
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE HF_COUNTER ADD (
PRIMARY KEY
(ID)
USING INDEX
ENABLE VALIDATE);
CREATE TABLE HF_AGGREGATED_COUNTER (ID          NUMBER (10)
,KEY        NVARCHAR2 (255)
,VALUE      NUMBER (10)
,EXPIRE_AT  TIMESTAMP (4))
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE HF_AGGREGATED_COUNTER ADD (oracle10g程序异常终止
PRIMARY KEY
(ID)
USING INDEX
ENABLE VALIDATE,
UNIQUE (KEY)
USING INDEX
ENABLE VALIDATE);
-- ----------------------------
-- Table structure for `DistributedLock`
-- ----------------------------
CREATE TABLE HF_DISTRIBUTED_LOCK ("RESOURCE" NVARCHAR2 (100), CREATED_AT TIMESTAMP (4))
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
-- ----------------------------
-- Table structure for `Hash`
-- ----------------------------
CREATE TABLE HF_HASH (ID          NUMBER (10)
,KEY        NVARCHAR2 (255)
,VALUE      NCLOB
,
EXPIRE_AT  TIMESTAMP (4)
,FIELD      NVARCHAR2 (40))
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE HF_HASH ADD (
PRIMARY KEY
(ID)
USING INDEX
ENABLE VALIDATE,
UNIQUE (KEY, FIELD)
USING INDEX
ENABLE VALIDATE);
-- Table structure for `JobParameter`
-- ----------------------------
CREATE TABLE HF_JOB_PARAMETER (ID      NUMBER (10)
,NAME    NVARCHAR2 (40)
,VALUE    NCLOB
,JOB_ID  NUMBER (10))
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE HF_JOB_PARAMETER ADD (
PRIMARY KEY
(ID)
USING INDEX
ENABLE VALIDATE);
ALTER TABLE HF_JOB_PARAMETER ADD (
CONSTRAINT FK_JOB_PARAMETER_JOB
FOREIGN KEY (JOB_ID)
REFERENCES HF_JOB (ID)
ON DELETE CASCADE ENABLE VALIDATE);
-- ----------------------------
-- Table structure for `JobQueue`
-- ----------------------------
CREATE TABLE HF_JOB_QUEUE (ID            NUMBER (10)
,JOB_ID        NUMBER (10)
,QUEUE        NVARCHAR2 (50)
,FETCHED_AT    TIMESTAMP (4)
,FETCH_TOKEN  NVARCHAR2 (36))
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE HF_JOB_QUEUE ADD (
PRIMARY KEY
(ID)
USING INDEX
ENABLE VALIDATE);
ALTER TABLE HF_JOB_QUEUE ADD (
CONSTRAINT FK_JOB_QUEUE_JOB
FOREIGN KEY (JOB_ID)
REFERENCES HF_JOB (ID)
ON DELETE CASCADE ENABLE VALIDATE);
-- ----------------------------
-- Table structure for `JobState`
-- ----------------------------
CREATE TABLE HF_JOB_STATE (ID          NUMBER (10)
,JOB_ID      NUMBER (10)
,NAME        NVARCHAR2 (20)
,REASON      NVARCHAR2 (100)
,
CREATED_AT  TIMESTAMP (4)
,DATA        NCLOB)
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE HF_JOB_STATE ADD (
PRIMARY KEY
(ID)
USING INDEX
ENABLE VALIDATE);
ALTER TABLE HF_JOB_STATE ADD (
CONSTRAINT FK_JOB_STATE_JOB
FOREIGN KEY (JOB_ID)
REFERENCES HF_JOB (ID)
ON DELETE CASCADE ENABLE VALIDATE);
-- ----------------------------
-- Table structure for `Server`
-- ----------------------------
CREATE TABLE HF_SERVER (ID NVARCHAR2 (100), DATA NCLOB, LAST_HEART_BEAT TIMESTAMP (4)) LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE HF_SERVER ADD (
PRIMARY KEY
(ID)
USING INDEX
ENABLE VALIDATE);
-- ----------------------------
-- Table structure for `Set`
-- ----------------------------
CREATE TABLE HF_SET (ID          NUMBER (10)
,KEY        NVARCHAR2 (255)
,VALUE      NVARCHAR2 (255)
,SCORE      FLOAT (126)
,EXPIRE_AT  TIMESTAMP (4))
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE HF_SET ADD (
PRIMARY KEY
(ID)
USING INDEX
ENABLE VALIDATE,
UNIQUE (KEY, VALUE)
ENABLE VALIDATE);
CREATE TABLE HF_LIST (ID          NUMBER (10)
,KEY        NVARCHAR2 (255)
,VALUE      NCLOB
,EXPIRE_AT  TIMESTAMP (4))
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE HF_LIST ADD (
PRIMARY KEY
(ID)
USING INDEX
ENABLE VALIDATE);
排查过程
今天测试部署的新环境程序⽆法启动，并把程序启动⽇志发给了我，如下：
FATAL 2020-11-20 10:18:13,426 [1    ] Microsoft.AspNetCore.Hosting.WebHost    - Application startup exception
Oracle.ManagedDataAccess.Client.OracleException (0x80004005): ORA-00955: 名称已由现有对象使⽤
at OracleInternal.ServiceObjects.OracleConnectionImpl.VerifyExecution(Int32& cursorId, Boolean bThrowArrayBindRelatedErrors, SqlStatementType sqlStatementType, Int32 arrayBindCount, OracleException& exceptionForArrayBindDML, Bo    at OracleInternal.ServiceObjects.OracleCommandImpl.ExecuteNonQuery(String commandText, OracleParameterCollection paramColl, CommandType commandType, OracleConnectionImpl connectionImpl, Int32 longFetchSize, Int64 clientInit    at Oracle.ManagedDataAccess.Client.OracleCommand.ExecuteNonQuery()
at Dapper.SqlMapper.ExecuteCommand(IDbConnection cnn, CommandDefinition& command, Action`2 paramReader) in C:\projects\dapper\Dapper\SqlMapper.cs:line 2797
at Dapper.SqlMapper.ExecuteImpl(IDbConnection cnn, CommandDefinition& command) in C:\projects\dapper\Dapper\SqlMapper.cs:line 568
at Dapper.SqlMapper.Execute(IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Nullable`1 commandTimeout, Nullable`1 commandType) in C:\projects\dapper\Dapper\SqlMapper.cs:line 441
at Hangfire.Oracle.Core.OracleObjectsInstaller.<>c__DisplayClass1_0.<Install>b__0(String s)
at System.Collections.Generic.List`1.ForEach(Action`1 action)
at Hangfire.Oracle.Core.OracleObjectsInstaller.Install(IDbConnection connection, String schemaName)
at Hangfire.Oracle.(String connectionString, OracleStorageOptions options)
at MOONS.XST.Web.Startup.Startup.<ConfigureServices>b__4_8(IGlobalConfiguration config) in D:\5865\core3-tmp\aspnet-core\src\MOONS.XST.Web.Host\Startup\Startup.cs:line 200
at Hangfire.HangfireServiceCollectionExtensions.<>c__DisplayClass0_0.<AddHangfire>b__0(IServiceProvider provider, IGlobalConfiguration config)
at Hangfire.HangfireServiceCollectionExtensions.<>c__DisplayClass1_0.<AddHangfire>b__7(IServiceProvider serviceProvider)
at Castle.Windsor.MsDependencyInjection.WindsorRegistrationHelper.<>c__DisplayClass5_0.<RegisterServiceDescriptor>b__0(IKernel c)
at Castle.MicroKernel.Registration.ComponentRegistration`1.<>c__DisplayClass84_0`1.<UsingFactoryMethod>b__0(IKernel k, ComponentModel m, CreationContext c)
at Castle.MicroKernel.ComponentActivator.FactoryMethodActivator`1.Instantiate(CreationContext context)
at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context)
at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context, Burden burden)
at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.CreateInstance(CreationContext context, Boolean trackedExternally)
at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context, IRelease
Policy releasePolicy)
at Castle.MicroKernel.Handlers.DefaultHandler.ResolveCore(CreationContext context, Boolean requiresDecommission, Boolean instanceRequired, Burden& burden)
at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context, Boolean instanceRequired)
at Castle.MicroKernel.DefaultKernel.ResolveComponent(IHandler handler, Type service, Arguments additionalArguments, IReleasePolicy policy, Boolean ignoreParentContext)
at Castle.MicroKernel.DefaultKernel.Castle.MicroKernel.IKernelInternal.Resolve(Type service, Arguments arguments, IReleasePolicy policy, Boolean ignoreParentContext)
at Castle.MicroKernel.DefaultKernel.Resolve(Type service, Arguments arguments)
at Castle.Windsor.WindsorContainer.Resolve(Type service)
看⽇志，得出关键字：“名称已由现有对象使⽤”,”Hangfire”、”Oracle“、“Dapper”。待会要根据这些关键字定位问题。
看了看数据库发现Hangfire相关的表没有⽣成，那就奇怪了，因为在我本地是可以创建表的，于是看测试服务器上配置的连接字符串，仔细核对发现也没什么问题。
然后我⽤Debug连接测试数据库进⾏代码调试，如下代码报错“名称已由现有对象使⽤”。⼜核对了⼀遍数据库连接字符串。
var oracleStorage = new OracleStorage(connectionString,
new OracleStorageOptions
{
TransactionIsolationLevel = IsolationLevel.ReadCommitted,
QueuePollInterval = TimeSpan.FromSeconds(15),
JobExpirationCheckInterval = TimeSpan.FromHours(1),
CountersAggregateInterval = TimeSpan.FromMinutes(5),
PrepareSchemaIfNecessary = true,
DashboardJobListLimit = 50000,
TransactionTimeout = TimeSpan.FromMinutes(1),
SchemaName = schemaName
});
config.UseStorage(oracleStorage);
，问了测试⼯程师，他装的环境是10g，⽽我们的开发环境是11g，搞了半天在“跨服聊天”。
然后去百度、Google。搜索关键词：“Hanfire Oracle 名称已由现有对象使⽤”。发现也没有类似报错。
我把“Install.sql”脚本单独⽤数据库可视化⼯具运⾏，果然报错“名称已由现有对象使⽤”。
分析“Install.sql”脚本，发现其中“LOB”不⽀持Oracle 10g，就只能修改这段脚本了，修改好的脚本在解决⽅案处。
public static class OracleObjectsInstaller
{
private static readonly ILog Log = LogProvider.GetLogger(typeof(OracleStorage));
public static void Install(IDbConnection connection, string schemaName)
{
if (connection == null) throw new ArgumentNullException(nameof(connection));
if (TablesExists(connection, schemaName))
{
Log.Info("DB tables already exist. Exit install");
return;
}
Log.Info("Start installing Hangfire ");
var script = GetStringResource("Hangfire.Oracle.Core.Install.sql");
var sqlCommands = script.Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
sqlCommands.ToList().ForEach(s => connection.Execute(s));
Log.Info("Hangfire SQL objects installed.");
}
private static bool TablesExists(IDbConnection connection, string schemaName)
{
string tableExistsQuery;
if (!string.IsNullOrEmpty(schemaName))
{
tableExistsQuery = $@"SELECT TABLE_NAME
FROM all_tables
WHERE OWNER = '{schemaName}' AND TABLE_NAME LIKE 'HF_%'
ORDER BY TABLE_NAME";
}
else
{
tableExistsQuery = @"SELECT TABLE_NAME
FROM all_tables
WHERE TABLE_NAME LIKE 'HF_%'
ORDER BY TABLE_NAME";
}
return connection.ExecuteScalar<string>(tableExistsQuery) != null;
}
private static string GetStringResource(string resourceName)
{
#if NET45
var assembly = typeof(OracleObjectsInstaller).Assembly;
#else
var assembly = typeof(OracleObjectsInstaller).GetTypeInfo().Assembly;
#endif
using (var stream = assembly.GetManifestResourceStream(resourceName))
{
if (stream == null)
{
throw new InvalidOperationException($"Requested resource `{resourceName}` was not found      in the assembly `{assembly}`.");                }
using (var reader = new StreamReader(stream))
{
return reader.ReadToEnd();
}
}
}
}
总结
解决问题的思路及顺序：
1. 看报错⽇志
2. 确认环境（避免“跨服聊天”）
3. 分析代码（跑起来看⼀看）
4. 百度（解决不了去确认关键词百度）
5. 看源码（百度不了去看源码）
6. 提Issue（源码不会改提Issue）
7. 问⼤佬（Issue没⼈理⼤佬⾥发个红包）
8. 换解决⽅案

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