Question

我正在尝试使用Oracle.ManagedDataAccess 6.121.1.0提供程序实现代码First Migrations，但根本没有成功。

当我收到ORA代码时，我假设连接已成功打开。但是迁移失败了，因为可能提供者表现为SQL Server而不是Oracle。我认为这是因为它使用'dbo'作为默认架构。

这是我的web.config设置：

<configuration>
  <configSections>
   <section name="entityFramework"
             type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
             requirePermission="false" />
    <section name="Oracle.ManagedDataAccess.Client"
             type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
  </configSections>
  <entityFramework>
    <contexts>
      <context type="MyProject.Context.MainContext, MyProject.Context">
        <databaseInitializer type="MyProject.Context.Config.ContextInitializer, MyProject.Context" />
      </context>
    </contexts>
    <defaultConnectionFactory type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess" />    
    <providers>    
      <provider invariantName="Oracle.ManagedDataAccess.Client" 
                type="Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices, Oracle.ManagedDataAccess.EntityFramework, Version=6.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
    </providers>
  </entityFramework>
  <system.data>
    <DbProviderFactories>
      <remove invariant="Oracle.ManagedDataAccess.Client" />
      <add name="ODP.NET, Managed Driver"
           invariant="Oracle.ManagedDataAccess.Client"
           description="Oracle Data Provider for .NET, Managed Driver"
           type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
    </DbProviderFactories>
  </system.data>
  <connectionStrings>
    <add name="MainContext"
         providerName="Oracle.ManagedDataAccess.Client"
         connectionString="Data Source=OracleServer:1521/BRSYSDS;User ID=USER;Password=PASSWORD;" />
  </connectionStrings>
  <!-- other settings -->
</configuration>

这里是Stacktrace：

[OracleException（0x77e）：ORA-01918：用户'dbo'不存在]
  OracleInternal.ServiceObjects.OracleCommandImpl.VerifyExecution（OracleConnectionImpl connectionImpl，Int32＆amp; cursorId，Boolean bThrowArrayBindRelatedErrors，OracleException＆amp; exceptionForArrayBindDML，Boolean＆amp; hasMoreRowsInDB，Boolean bFirstIterationDone）+652   OracleInternal.ServiceObjects.OracleCommandImpl.VerifyExecution（OracleConnectionImpl connectionImpl，Int32＆amp; cursorId，Boolean bThrowArrayBindRelatedErrors，OracleException＆amp; exceptionForArrayBindDML，Boolean bFirstIterationDone）+39
  OracleInternal.ServiceObjects.OracleCommandImpl.ExecuteNonQuery（字符串的CommandText，OracleParameterCollection paramColl，的CommandType命令类型，OracleConnectionImpl connectionImpl，的Int32 longFetchSize，Int64的clientInitialLOBFS，OracleDependencyImpl orclDependencyImpl，Int64的[]＆安培; scnFromExecution，OracleParameterCollection＆安培; bindByPositionParamColl，布尔＆安培; bBindParamPresent，OracleException＆安培; exceptionForArrayBindDML，布尔isFromEF ）+7480
  Oracle.ManagedDataAccess.Client.OracleCommand.ExecuteNonQuery（）+678
  System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.b__0（DbCommand t，DbCommandInterceptionContext 1 c) +10 System.Data.Entity.Infrastructure.Interception.InternalDispatcher 1.Dispatch（TTarget target，Func 3 operation, TInterceptionContext interceptionContext, Action 3执行，Action 3 executed) +72 System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand command, DbCommandInterceptionContext interceptionContext) +357 System.Data.Entity.Internal.InterceptableDbCommand.ExecuteNonQuery() +104 System.Data.Entity.Migrations.DbMigrator.ExecuteSql(DbTransaction transaction, MigrationStatement migrationStatement, DbInterceptionContext interceptionContext) +152 System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable 1 migrationStatements，DbTransaction事务，DbInterceptionContext interceptionContext）+82
  System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal（IEnumerable 1 migrationStatements, DbConnection connection) +626 System.Data.Entity.Migrations.<>c__DisplayClass30.<ExecuteStatements>b__2e() +19 System.Data.Entity.Infrastructure.DefaultExecutionStrategy.Execute(Action operation) +9 System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable 1 migrationStatements，DbTransaction existingTransaction）+194
  System.Data.Entity.Migrations.DbMigrator.ExecuteStatements（IEnumerable 1 migrationStatements) +7 System.Data.Entity.Migrations.DbMigrator.ExecuteOperations(String migrationId, XDocument targetModel, IEnumerable 1个操作，IEnumerable 1 systemOperations, Boolean downgrading, Boolean auto) +825 System.Data.Entity.Migrations.DbMigrator.AutoMigrate(String migrationId, VersionedModel sourceModel, VersionedModel targetModel, Boolean downgrading) +564 System.Data.Entity.Migrations.DbMigrator.Upgrade(IEnumerable 1 pendingMigrations，String targetMigrationId，String lastMigrationId）+404
  System.Data.Entity.Migrations.DbMigrator.UpdateInternal（String targetMigration）+447
  System.Data.Entity.Migrations。＆lt;＆gt; c__DisplayClassc.b__b（）+ 13
  System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists（Action mustSucceedToKeepDatabase）+422
  System.Data.Entity.Migrations.DbMigrator.Update（String targetMigration）+78
  System.Data.Entity.Internal.DatabaseCreator.CreateDatabase（InternalContext internalContext，Func 3 createMigrator, ObjectContext objectContext) +89 System.Data.Entity.Internal.InternalContext.CreateDatabase(ObjectContext objectContext, DatabaseExistenceState existenceState) +116 System.Data.Entity.Database.Create(DatabaseExistenceState existenceState) +218 System.Data.Entity.DropCreateDatabaseAlways 1.InitializeDatabase（TContext context）+137

Answer 1

我遇到了同样的问题，Thiago Lunardi的回答解决了这个问题。谢谢。我没有足够的声誉来表达你的回复。在这里提一下，我在UPPERCASE中设置模式名称后成功了。

将它放在新dbContext类下的Context文件中，如下所示：

public partial class MyAppContext : DbContext
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.HasDefaultSchema("UPPERCASE_SCHEMA_NAME");
...

Answer 2

我只是在modelBuilder

中设置默认架构来解决这个问题

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.HasDefaultSchema("MyOracleSchema");

    // ...
}

Answer 3

设置默认架构对我不起作用。我通过自定义迁移历史记录表来设置不同的架构，从而找到了解决方案。

您可以在此处找到解决方案：LINK。

Answer 4

如果缺少表格的完全限定名称，用户Dbo也会出现。这可能无法映射到数据库中的右表。

enter image description here

Answer 5

如果您使用自动迁移（就像我一样），请注意：modelBuilder.HasDefaultSchema在您切换到显式迁移之前不会有任何帮助。

来自Oracle Docs：

代码优先自动迁移仅限于使用 dbo 架构。由于此限制，建议使用基于代码的迁移，即通过Add-Migration命令添加显式迁移

Answer 6

在Code First中，您可以使用Table的DataAnnotations。

[表格（“Emplpoyee”，Schema =“您的计划名称”]

Answer 7

我遇到了同样的问题。我将模式名称放在 OnModelCreating() 方法中。

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.HasDefaultSchema("MyOracleSchema");

    // ...
}

但是，以大写形式设置架构名称对我不起作用。我在 Confifuration.cs 中添加了下面提到的代码，它起作用了！！

转到迁移 -> Configuration.cs

 class Configuration : DbMigrationsConfiguration<CodeFirstOracleProject.Context>
{
    public Configuration()
    {
        AutomaticMigrationsEnabled = false;
        var historyContextFactory = GetHistoryContextFactory("Oracle.ManagedDataAccess.Client");
        SetHistoryContextFactory("Oracle.ManagedDataAccess.Client",
                                 (dbc, schema) => historyContextFactory.Invoke(dbc, "YourSchemaName"));
    }
}

Answer 8

在我的情况下，以大写形式编写模式名称是不够的，我不得不使用 toUpper() 函数：

 modelBuilder.HasDefaultSchema("YOURSCHEMA".ToUpper())

同时添加

   public Configuration()
    {
        AutomaticMigrationsEnabled = false;
        var historyContextFactory = GetHistoryContextFactory("Oracle.ManagedDataAccess.Client");
        SetHistoryContextFactory("Oracle.ManagedDataAccess.Client",
                                 (dbc, schema) => historyContextFactory.Invoke(dbc, "YOURSCHEMA".ToUpper()));
    }

删除迁移并重新生成它们解决了问题。

Oracle.ManagedDataAccess.EntityFramework - ORA-01918：用户'dbo'不存在

8 个答案: