entity-framework - EF Core Include 方法不起作用

Question

我最近更新到了 asp.net core 2.0。由于使用 Include Method 升级我的所有 Linq 查询都失败了，因此它没有正确转换为 SQL。

例如这个:

var entities = helpTopicRepository.Entities.Include(x => x.HelpArticles).FirstOrDefault(t => topicIds.Any(a => a == t.Id));

翻译成:

SELECT x.HelpArticles.ART_ID, 
x.HelpArticles.AVAILABLE, 
x.HelpArticles.CONTENT, 
x.HelpArticles.DISPLAYORDER, 
x.HelpArticles.HELPFULNO, 
x.HelpArticles.HELPFULYES, 
x.HelpArticles.KEYWORDS, 
x.HelpArticles.TITLE, 
x.HelpArticles.TOPICID
FROM HELPARTICLE x.HelpArticles 

这导致以下错误:

Devart.Data.Oracle.OracleException (0x80004005): ORA-00933: SQL

command not properly ended at Devart.Data.Oracle.ay.b() at Devart.Data.Oracle.am.f() at Devart.Data.Oracle.am.e() at Devart.Data.Oracle.c5.a(am A_0, Int32 A_1) at Devart.Data.Oracle.c5.a(Int32 A_0, bg A_1) at Devart.Data.Oracle.OracleCommand.InternalExecute(CommandBehavior behavior, IDisposable disposable, Int32 startRecord, Int32 maxRecords, Boolean nonQuery) at Devart.Common.DbCommandBase.ExecuteDbDataReader(CommandBehavior behavior, Boolean nonQuery) at Devart.Data.Oracle.Entity.ai.a(CommandBehavior A_0) at Devart.Common.Entity.cj.d(CommandBehavior A_0) at Devart.Data.Oracle.Entity.ai.b(CommandBehavior A_0) at System.Data.Common.DbCommand.ExecuteReader() at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, DbCommandMethod executeMethod, IReadOnlyDictionary2
parameterValues) at
Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteReader(IRelationalConnection
connection, IReadOnlyDictionary2 parameterValues) at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable1.Enumerator.BufferlessMoveNext(Boolean
buffer) at
Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable1.Enumerator.MoveNext() at Microsoft.EntityFrameworkCore.Query.Internal.QueryBuffer.IncludeCollection(Int32 includeId, INavigation navigation, INavigation inverseNavigation, IEntityType targetEntityType, IClrCollectionAccessor clrCollectionAccessor, IClrPropertySetter inverseClrPropertySetter, Boolean tracking, Object entity, Func1 relatedEntitiesFactory) at
lambda_method(Closure , QueryContext , Client , Object[] ) at
Microsoft.EntityFrameworkCore.Query.Internal.IncludeCompiler._Include[TEntity](QueryContext
queryContext, TEntity entity, Object[] included, Action3 fixup) at lambda_method(Closure , Client ) at System.Linq.Enumerable.SelectEnumerableIterator2.MoveNext() at
System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable1 source) at lambda_method(Closure , QueryContext ) at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<>c__DisplayClass17_0`1.b__0(QueryContext qc) ORA-00933: SQL command not properly ended

我正在使用 Devart dotconnect 连接到 Oracle 数据库。

Answer 1

是因为你的说法:

var entities = helpTopicRepository.Entities.Include(x => x.HelpArticles).FirstOrDefault(t => topicIds.Any(a => a == t.Id));

假设 topicIds是一个列表，这里有一个修复:

var entities = helpTopicRepository.Entities
    .Include(x => x.HelpArticles)
    .Where(t => topicIds.Contains(t.Id))
    .FirstOrDefault();