我试图让NHibernate使用Oracle 11g的XmlType。
抛出以下异常:
Dialect does not support DbType.Xml
我的配置如下:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
<session-factory>
<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
<property name="dialect">NHibernate.Dialect.Oracle10gDialect</property>
<property name="connection.driver_class">NHibernate.Driver.OracleClientDriver</property>
<property name="connection.connection_string">...</property>
<property name="show_sql">false</property>
</session-factory>
</hibernate-configuration>
当然,XmlType功能是在11g中引入的,但我不知道配置Mapping。有人在这里使用此功能并愿意显示其配置吗?
感谢。
修改1:
班级的重要部分:
[DataMember]
public virtual XmlDocument History { get; set; }
映射文件的重要部分:
<property name="History" />
答案 0 :(得分:2)
尝试使用自定义Oracle数据客户端驱动程序,这里是代码:
using System;
using System.Data;
using System.Data.Common;
using System.Reflection;
using NHibernate;
using NHibernate.AdoNet;
using NHibernate.Driver;
using NHibernate.Engine.Query;
using NHibernate.SqlTypes;
using NHibernate.Util;
using Oracle.DataAccess.Client;
/// <summary>
/// A NHibernate Driver for using the Oracle.DataAccess DataProvider
/// </summary>
/// <remarks>
/// Code was contributed by <a href="http://sourceforge.net/users/jemcalgary/">James Mills</a> on the NHibernate forums in this <a
/// href="http://sourceforge.net/forum/message.php?msg_id=2952662">post</a> .
/// </remarks>
public class CustomOracleDataClientDriver : ReflectionBasedDriver, IEmbeddedBatcherFactoryProvider {
private const string DriverAssemblyName = "Oracle.DataAccess";
private const string ConnectionTypeName = "Oracle.DataAccess.Client.OracleConnection";
private const string CommandTypeName = "Oracle.DataAccess.Client.OracleCommand";
private static readonly SqlType GuidSqlType = new SqlType(DbType.Binary, 16);
private readonly PropertyInfo oracleDbType;
private readonly object oracleDbTypeRefCursor;
private readonly object oracleDbTypeXmlType;
/// <summary>
/// Initializes a new instance of <see cref="OracleDataClientDriver" /> .
/// </summary>
/// <exception cref="HibernateException">Thrown when the
/// <c>Oracle.DataAccess</c>
/// assembly can not be loaded.</exception>
public CustomOracleDataClientDriver()
: base(
DriverAssemblyName,
ConnectionTypeName,
CommandTypeName) {
var parameterType = ReflectHelper.TypeFromAssembly("Oracle.DataAccess.Client.OracleParameter",
DriverAssemblyName, false);
this.oracleDbType = parameterType.GetProperty("OracleDbType");
var oracleDbTypeEnum = ReflectHelper.TypeFromAssembly("Oracle.DataAccess.Client.OracleDbType",
DriverAssemblyName, false);
this.oracleDbTypeRefCursor = Enum.Parse(oracleDbTypeEnum, "RefCursor");
this.oracleDbTypeXmlType = Enum.Parse(oracleDbTypeEnum, "XmlType");
}
/// <summary>
/// </summary>
public override bool UseNamedPrefixInSql {
get { return true; }
}
/// <summary>
/// </summary>
public override bool UseNamedPrefixInParameter {
get { return true; }
}
/// <summary>
/// </summary>
public override string NamedPrefix {
get { return ":"; }
}
#region IEmbeddedBatcherFactoryProvider Members
Type IEmbeddedBatcherFactoryProvider.BatcherFactoryClass {
get { return typeof (OracleDataClientBatchingBatcherFactory); }
}
#endregion
/// <remarks>
/// This adds logic to ensure that a DbType.Boolean parameter is not created since ODP.NET doesn't support it.
/// </remarks>
protected override void InitializeParameter(IDbDataParameter dbParam, string name, SqlType sqlType) {
// if the parameter coming in contains a boolean then we need to convert it
// to another type since ODP.NET doesn't support DbType.Boolean
switch (sqlType.DbType) {
case DbType.Boolean:
base.InitializeParameter(dbParam, name, SqlTypeFactory.Int16);
break;
case DbType.Guid:
base.InitializeParameter(dbParam, name, GuidSqlType);
break;
case DbType.Xml:
dbParam.ParameterName = this.FormatNameForParameter(name);
this.oracleDbType.SetValue(dbParam, this.oracleDbTypeXmlType, null);
break;
default:
base.InitializeParameter(dbParam, name, sqlType);
break;
}
}
protected override void OnBeforePrepare(IDbCommand command) {
base.OnBeforePrepare(command);
((OracleCommand) command).BindByName = true;
var detail = CallableParser.Parse(command.CommandText);
if (!detail.IsCallable)
return;
command.CommandType = CommandType.StoredProcedure;
command.CommandText = detail.FunctionName;
var outCursor = command.CreateParameter();
this.oracleDbType.SetValue(outCursor, this.oracleDbTypeRefCursor, null);
outCursor.Direction = detail.HasReturn ? ParameterDirection.ReturnValue : ParameterDirection.Output;
command.Parameters.Insert(0, outCursor);
}
}
NHibernate配置:
...
<property name="connection.driver_class">
Your.NameSpace.CustomOracleDataClientDriver, Your.Assembly.Name
</property>
<property name="dialect">
NHibernate.Dialect.Oracle10gDialect
</property>
...
的示例