NHibernate Oracle XMLType issue
本文关键字:issue XMLType Oracle NHibernate | 更新日期: 2023-09-27 18:31:41
我们在oracle 10g数据库中有一个函数,它返回XMLTYPE值。 我们试图在命令对象中使用 ParameterDirection.ReturnValue 从函数中获取返回值。
但是我们得到错误
System.Data.OracleClient.OracleException (0x80131938): ORA-06550: 第 1 行,第 27 列:PLS-00382:表达式类型错误ORA-06550:第 1 行,第 7 列:PL/SQL:忽略语句
如何解决这个问题?
自从我处理这个问题以来已经有一段时间了,目前我没有一个工作项目来验证这个问题,但是,我相信这将解决你的问题。
我解决这个问题的方式是做一个nHibernate项目的定制构建。我编辑了OracleDataClientDriver.cs文件,编辑了下面的编辑。您应该注意,我刚刚下载了此文件的当前版本,并且在我进行修复后的过去 2 年中它略有变化。如果您从 nHibernate 存储库中获取文件的当前版本,并使用我要粘贴的代码对文件进行 dif ,您将看到更改。我的更改是行号(根据我的编辑器)26、45、82-85。
修复的主题是我必须添加从 nHibernate 映射文件类型到 Oracle 数据类型的映射 XML 格式。Oracle 驱动程序将处理此类型,但在 nHibernate 中使用它的逻辑缺失。以下是对此的修复方法。
开始粘贴-----
using System.Data;
using System.Reflection;
using NHibernate.AdoNet;
using NHibernate.Engine.Query;
using NHibernate.SqlTypes;
using NHibernate.Util;
namespace NHibernate.Driver
{
/// <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 OracleDataClientDriver : 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 OracleDataClientDriver()
: base(
driverAssemblyName,
connectionTypeName,
commandTypeName)
{
System.Type parameterType = ReflectHelper.TypeFromAssembly("Oracle.DataAccess.Client.OracleParameter", driverAssemblyName, false);
oracleDbType = parameterType.GetProperty("OracleDbType");
System.Type oracleDbTypeEnum = ReflectHelper.TypeFromAssembly("Oracle.DataAccess.Client.OracleDbType", driverAssemblyName, false);
oracleDbTypeRefCursor = System.Enum.Parse(oracleDbTypeEnum, "RefCursor");
oracleDbTypeXmlType = System.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 ":"; }
}
/// <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 = base.FormatNameForParameter(name);
oracleDbType.SetValue(dbParam, oracleDbTypeXmlType, null);
break;
default:
base.InitializeParameter(dbParam, name, sqlType);
break;
}
}
protected override void OnBeforePrepare(IDbCommand command)
{
base.OnBeforePrepare(command);
CallableParser.Detail detail = CallableParser.Parse(command.CommandText);
if (!detail.IsCallable)
return;
command.CommandType = CommandType.StoredProcedure;
command.CommandText = detail.FunctionName;
IDbDataParameter outCursor = command.CreateParameter();
oracleDbType.SetValue(outCursor, oracleDbTypeRefCursor, null);
outCursor.Direction = detail.HasReturn ? ParameterDirection.ReturnValue : ParameterDirection.Output;
command.Parameters.Insert(0, outCursor);
}
#region IEmbeddedBatcherFactoryProvider Members
System.Type IEmbeddedBatcherFactoryProvider.BatcherFactoryClass
{
get { return typeof (OracleDataClientBatchingBatcherFactory); }
}
#endregion
}
结束粘贴-------