第一个使用entityframework fluent api的数据访问方法,Dev Art在Oracle数据库中获取低于错误的数据。ORA-01450:超出最大密钥长度(6398)(Devart.Data.Oracle.OracleException)
实际的表设计:
此查询失败。
CREATE TABLE DADeskSettings (
UserID NVARCHAR2(2000) NOT NULL,
Password NVARCHAR2(2000) NOT NULL,
DADeskURL NVARCHAR2(2000) NOT NULL,
WebURL NVARCHAR2(2000) NOT NULL,
IsDADeskSettings NUMBER(1) NOT NULL,
DAType VARCHAR2(4 CHAR) NOT NULL,
UPDATEDADESK NUMBER(1) NOT NULL,
isshortseavoy NUMBER(1) NULL,
CreatedBy VARCHAR2(8 CHAR) NULL,
UpdatedBy VARCHAR2(8 CHAR) NULL,
CONSTRAINT PK_DADeskSettings PRIMARY KEY (UserID, Password, DADeskURL, WebURL, IsDADeskSettings, DAType)
)
ORA-01450: maximum key length (6398) exceeded
但它适用于entityframework edmx model + devArt。有什么建议么?
var dummy2 = ContextFactory.Db.GetQuery<OPRPortCall>().Select(x=>x.AccountCode).FirstOrDefault(); //this is one of the line.
*** Client Application Says ***
- ORA-01450: maximum key length (6398) exceeded (Devart.Data.Oracle.OracleException)
- The type initializer for 'Server.ManagerService.Registers.LookupVmSvc' threw an exception. (System.TypeInitializationException)
- Exception has been thrown by the target of an invocation. (System.Reflection.TargetInvocationException)
Stacktrace
*** Client Application Says ***
at Devart.Data.Oracle.bh.d(Int32 A_0)
at Devart.Data.Oracle.de.a(Int32 A_0, z 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.OracleCommand.ExecuteNonQuery()
at Devart.Common.Entity.ej.a(DbConnection A_0, Nullable`1 A_1, b3 A_2)
at Devart.Common.Entity.ej.a(DbConnection A_0, Nullable`1 A_1)
at Devart.Data.Oracle.Entity.OracleEntityProviderServices.DbCreateDatabase(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection)
at System.Data.Entity.Internal.DatabaseOperations.Create(ObjectContext objectContext)
at System.Data.Entity.Internal.DatabaseCreator.CreateDatabase(InternalContext internalContext, Func`3 createMigrator, ObjectContext objectContext)
at System.Data.Entity.Database.Create(DatabaseExistenceState existenceState)
at System.Data.Entity.CreateDatabaseIfNotExists`1.InitializeDatabase(TContext context)
at System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action)
at System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization()
at System.Data.Entity.Internal.RetryAction`1.PerformAction(TInput input)
at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action`1 action)
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
at System.Data.Entity.Internal.Linq.InternalSet`1.AsNoTracking()
at System.Data.Entity.Infrastructure.DbQuery`1.AsNoTracking()
at Server.Manager.DataAccess.VMEntities.GetQuery[T](Boolean tracking)
加入查询其抛出错误上问题描述,config.CodeFirstOptions.TruncateLongDefaultNames = true does not帮助 – anand
任何其他可能性? – anand
您正在使用代码优先方法(数据库结构是在运行时生成的),是不是? 有两种可选的方法来解决这一问题: 1)升级到9.4.280或更高,以获得一个修复 https://www.devart.com/dotconnect/oracle/revision_history.html 9.4.280 25 -May-17 对带有字符串列的EF核心模型的支持(定义为没有长度限制并且参与PK,FK,索引)得到了改进 2)为您的映射添加长度大小,以便所有长度列参与PK的人不会超过6398的限制 – Devart