.net – 使用Oracle的NHibernate多查询/期货

我试图在NHibernate 3.2和Oracle 11gR2中使用期货.虽然我不确定,但这似乎并不支持.我在NHibernate Jira上找到了 this issue,这看起来甲骨文似乎可能有未来.有谁知道如何让期货与Oracle合作？ Oracle不受支持的原因究竟是什么？

更新

根据这里的评论,我尝试使用HQL multiquery.我在执行_nhSession.CreateMultiQuery()时遇到异常;这是例外：

The driver NHibernate.Driver.OracleDataClientDriver does not support multiple queries.

我还能尝试什么？我使用了错误的驱动程序吗？

我想分享一下NHibernate Future查询如何与Oracle协同工作的方式.您可以将以下两个类EnhancedOracleDataClientDriver和EnhancedOracleResultSetsCommand添加到您的项目中,并将NHibernate配置为使用EnhancedOracleDataClientDriver类作为数据库驱动程序.我很感激这种方法是否适用于其他人的反馈.这是上述类的源代码.

EnhancedOracleDataClientDriver.cs

using NHibernate.Engine;

namespace NHibernate.Driver
{
    public class EnhancedOracleDataClientDriver : OracleDataClientDriver
    {
        public override bool SupportsMultipleQueries
        {
            get
            {
                return true;
            }
        }

        public override IResultSetsCommand GetResultSetsCommand(ISessionImplementor session)
        {
            return new EnhancedOracleResultSetsCommand(session);
        }
    }
}

EnhancedOracleResultSetsCommand.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Reflection;
using NHibernate.Engine;
using NHibernate.sqlCommand;
using NHibernate.sqlTypes;
using NHibernate.Util;

namespace NHibernate.Driver
{
    public class EnhancedOracleResultSetsCommand : BasicResultSetsCommand
    {
        private const string driverAssemblyName = "Oracle.DataAccess";

        private sqlString sqlString = new sqlString();
        private int cursorCount = 0;
        private readonly PropertyInfo oracleDbType;
        private readonly object oracleDbTypeRefCursor;

        public EnhancedOracleResultSetsCommand(ISessionImplementor session)
            : base(session)
        {
            System.Type parameterType = ReflectHelper.TypeFromAssembly("Oracle.DataAccess.Client.OracleParameter",driverAssemblyName,false);
            oracleDbType = parameterType.GetProperty("OracleDbType");

            System.Type oracleDbTypeEnum = ReflectHelper.TypeFromAssembly("Oracle.DataAccess.Client.OracleDbType",false);
            oracleDbTypeRefCursor = System.Enum.Parse(oracleDbTypeEnum,"RefCursor");
        }

        public override void Append(IsqlCommand command)
        {
            Commands.Add(command);
            sqlString = sqlString.Append("\nopEN :cursor")
                .Append(Convert.ToString(cursorCount++))
                .Append("\nFOR\n")
                .Append(command.Query).Append("\n;\n");
        }

        public override sqlString sql
        {
            get { return sqlString; }
        }

        public override IDataReader GetReader(int? commandTimeout)
        {
            var batcher = Session.Batcher;
            sqlType[] sqlTypes = Commands.SelectMany(c => c.ParameterTypes).ToArray();
            ForEachsqlCommand((sqlLoaderCommand,offset) => sqlLoaderCommand.ResetParametersIndexesForTheCommand(offset));

            sqlString = sqlString.Insert(0,"\nBEGIN\n").Append("\nEND;\n");

            var command = batcher.PrepareQueryCommand(CommandType.Text,sqlString,sqlTypes);
            if (commandTimeout.HasValue) {
                command.CommandTimeout = commandTimeout.Value;
            }

            BindParameters(command);

            for (int cursorIndex = 0; cursorIndex < cursorCount; cursorIndex++) {
                IDbDataParameter outCursor = command.CreateParameter();
                oracleDbType.SetValue(outCursor,oracleDbTypeRefCursor,null);
                outCursor.ParameterName = ":cursor" + Convert.ToString(cursorIndex);
                outCursor.Direction = ParameterDirection.Output;
                command.Parameters.Add(outCursor);
            }

            return new BatcherDataReaderWrapper(batcher,command);
        }
    }
}

原文地址：https://www.jb51.cc/oracle/205005.html

.net – 使用Oracle的NHibernate多查询/期货

相关推荐