c# – NHibernate.Exceptions.GenericADOException：无法执行查询

2023年5月31日 214次阅读

我有一个遗留应用程序(vfp 8),我需要从中提取数据(无插入).我使用Accnum字段作为主键,它在表中定义为字符11.

工厂配置：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
<reflection-optimizer use="false" />
<session-factory>
<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
<property name="dialect">NHibernate.Dialect.GenericDialect</property>
<property name="connection.driver_class">NHibernate.Driver.OleDbDriver</property>
<property name="connection.connection_string">Provider=VFPOLEDB.1;Data Source=C:\Analysis\Quantium\development\RD warehouse\_RDAUWH\Data;Collating Sequence=MACHINE</property>
<property name="show_sql">false</property>
</session-factory>
</hibernate-configuration>

这是我的映射文件：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
               assembly="RDLabels"
               namespace="RDLabels.Domain">

  <class name="CustMast">
    <id name="Accnum" column="Accnum" type="string">
    <generator class="assigned"/>
    </id>
    <property name="Fullname" />
    <property name="Add" />
    <property name="State" />
  </class>  
</hibernate-mapping>

班级：

public class CustMast
{
    private string _accnum;
    public virtual string Accnum
    {
        get { return _accnum; }
        set { _accnum = value; }
    }
    private string _fullname;
    public virtual string Fullname
    {
        get { return _fullname; }
        set { _fullname = value; }
    }
    private string _add;
    public virtual string Add
    {
        get { return _add; }
        set { _add = value; }
    }
    private string _state;
    public virtual string State
    {
        get { return _state; }
        set { _state = value; }
    }
}

以下是获取记录的代码：

public CustMast GetByAccnum(String accnum)
{
        using (ISession session = NHibernateHelper.OpenSession())
        {
            CustMast custMast = session
                                .CreateCriteria(typeof(CustMast))
                                .Add(Restrictions.Eq("Accnum", accnum))
                                .UniqueResult<CustMast>();
            return custMast;
        }
}

完整的错误是：

NHibernate.Exceptions.GenericADOException : could not execute query
[ SELECT this_.Accnum as Accnum0_0_, this_.Fullname as Fullname0_0_, this_.Add as Add0_0_, this_.State as State0_0_ FROM CustMast this_ WHERE this_.Accnum = ? ]
Name:cp0 - Value:00059337444
[SQL: SELECT this_.Accnum as Accnum0_0_, this_.Fullname as Fullname0_0_, this_.Add as Add0_0_, this_.State as State0_0_ FROM CustMast this_ WHERE this_.Accnum = ?]
----> System.IndexOutOfRangeException : Invalid index 0 for this OleDbParameterCollection with Count=0. - d:\CSharp\NH\NH\nhibernate\src\NHibernate\Loader\Loader.cs:1590

运行NHibernate Profiler,它显示：

WARN: 
reflection-optimizer property is ignored out of application configuration file.


WARN: 
System.IndexOutOfRangeException: Invalid index 0 for this OleDbParameterCollection with Count=0.
at System.Data.OleDb.OleDbParameterCollection.RangeCheck(Int32 index)
at System.Data.OleDb.OleDbParameterCollection.GetParameter(Int32 index)
at System.Data.Common.DbParameterCollection.System.Collections.IList.get_Item(Int32 index)
at NHibernate.Driver.DriverBase.ExpandQueryParameters(IDbCommand cmd, SqlString sqlString) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Driver\DriverBase.cs:line 235
at NHibernate.AdoNet.AbstractBatcher.ExpandQueryParameters(IDbCommand cmd, SqlString sqlString) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\AdoNet\AbstractBatcher.cs:line 232
at NHibernate.Loader.Loader.PrepareQueryCommand(QueryParameters queryParameters, Boolean scroll, ISessionImplementor session) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Loader\Loader.cs:line 1152

ERROR: 
Invalid index 0 for this OleDbParameterCollection with Count=0.

最佳答案 每当我传递一个参数时,我都在努力解决我的linq查询丢失相同的错误.如果我没有传递任何参数并做了session.Query()他们会工作正常.

我挣扎了几天,但我发现这张Nhibernate jira票here.它解释了SQLParameters和Iseries Db2提供程序的明显问题.

我知道您使用的是其他提供商,但您可能只需下载最新的Nhibernate核心源代码,构建它并在项目中引用最新版本即可获益.它解决了我的问题.

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