Fluent NHibernate將XDocument屬性映射到Oracle XMLType

Question

我正在尋找從XDocument屬性類型映射到Oracle XMLType的最佳方法？我正在映射到遺留數據庫，並且無法控制架構。它是Oracle 9i。

我已經讀過nHibernate的第3版提供了這種類型的映射的出箱功能。我使用3.1版本，用流利的映射和我用一個創建默認的地圖時收到以下錯誤：

System.ArgumentOutOfRangeException : Specified argument was out of the range of valid values. at Oracle.DataAccess.Client.OracleParameter.set_DbType(DbType value) at NHibernate.Driver.DriverBase.SetCommandParameters(IDbCommand cmd, SqlType[] sqlTypes) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Driver\DriverBase.cs: line 180 at NHibernate.Driver.DriverBase.GenerateCommand(CommandType type, SqlString sqlString, SqlType[] parameterTypes) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Driver\DriverBase.cs: line 136 at NHibernate.AdoNet.AbstractBatcher.Generate(CommandType type, SqlString sqlString, SqlType[] parameterTypes) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\AdoNet\AbstractBatcher.cs: line 78 at NHibernate.AdoNet.AbstractBatcher.PrepareBatchCommand(CommandType type, SqlString sql, SqlType[] parameterTypes) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\AdoNet\AbstractBatcher.cs: line 146 at NHibernate.Persister.Entity.AbstractEntityPersister.Insert(Object id, Object[] fields, Boolean[] notNull, Int32 j, SqlCommandInfo sql, Object obj, ISessionImplementor session) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Persister\Entity\AbstractEntityPersister.cs: line 2616 at NHibernate.Persister.Entity.AbstractEntityPersister.Insert(Object id, Object[] fields, Object obj, ISessionImplementor session) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Persister\Entity\AbstractEntityPersister.cs: line 3050 at NHibernate.Action.EntityInsertAction.Execute() in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Action\EntityInsertAction.cs: line 59 at NHibernate.Engine.ActionQueue.Execute(IExecutable executable) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Engine\ActionQueue.cs: line 136 at NHibernate.Engine.ActionQueue.ExecuteActions(IList list) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Engine\ActionQueue.cs: line 125 at NHibernate.Engine.ActionQueue.ExecuteActions() in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Engine\ActionQueue.cs: line 170 at NHibernate.Event.Default.AbstractFlushingEventListener.PerformExecutions(IEventSource session) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Event\Default\AbstractFlushingEventListener.cs: line 241 at NHibernate.Event.Default.DefaultFlushEventListener.OnFlush(FlushEvent event) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Event\Default\DefaultFlushEventListener.cs: line 20 at NHibernate.Impl.SessionImpl.Flush() in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Impl\SessionImpl.cs: line 1470

我得到了這一輪我寫這一個XDocument和一個字符串之間的轉換我自己的用戶類型：

public SqlType[] SqlTypes 
{ 
get { return (new SqlType[] { new StringClobSqlType() }); } 
} 

public Type ReturnedType 
{ 
get { return (typeof(XDocument)); } 
} 

public object NullSafeGet(IDataReader rs, string[] names, object owner) 
{ 
XDocument xDoc = null; 

int columnIndex = rs.GetOrdinal(names[0]); 
if (!rs.IsDBNull(columnIndex)) 
{ 
xDoc = XDocument.Parse((rs[columnIndex].ToString())); 
} 

return (xDoc); 
} 

public void NullSafeSet(IDbCommand cmd, object value, int index) 
{ 
IDbDataParameter parameter = (IDbDataParameter)cmd.Parameters[index]; 

if (value == null) 
{ 
parameter.Value = DBNull.Value; 
} 
else 
{ 
XDocument xDoc = (XDocument)value; 
parameter.Value = xDoc.ConvertToString(); 

} 
} 

這工作正常，直到字符串的長度大於4000個字符。現在，我得到的錯誤：

NHibernate.Exceptions.GenericADOException : could not insert: [XmlBlob#95586][SQL: INSERT INTO XMLBLOB (CAT_CODE, BLB_BLOB, BLB_ID) VALUES (?, ?, ?)] ----> Oracle.DataAccess.Client.OracleException : ORA-01461: can bind a LONG value only for insert into a LONG column

Answer 1

我需要能夠以超過4000個字符保存到XMLType列的唯一更新是設置參數類型爲OracleDbType.XmlType的設置方法爲我的用戶類型的實現：

public void NullSafeSet(IDbCommand cmd, object value, int index) 
    { 
     IDbDataParameter parameter = (IDbDataParameter)cmd.Parameters[index]; 
     ((OracleParameter)parameter).OracleDbTypeEx = OracleDbType.XmlType; 

     if (value == null) 
     { 
      parameter.Value = DBNull.Value; 
     } 
     else 
     { 
      XDocument xDoc = (XDocument)value; 
      parameter.Value = xDoc.ConvertToString(); 
     } 
    }