我有一本字典在我的课NHibernate的解释:无法初始化集合
public class AffectedVehicleInScenario : DomainObjectWithId {
... some other properties ...
private readonly int _id;
private readonly IDictionary<int, int> _installationRates
= new Dictionary<int, int>();
... some code ...
}
和它映射如下
<class name="AffectedVehicleInScenario"
table="tblAffectedVehicleInScenario"
lazy="false">
<id name="_id"
column="Id"
access="field">
<generator class="native" />
</id>
... some other properties ...
<map name="_installationRates"
table="tblInstallationRatesOfAffectedVehicleInScenario"
access="field"
lazy="false">
<key column="AffectedVehicleInScenarioId" not-null="true"/>
<index column="Year" type="Int32"/>
<element column="InstallationRate"
not-null="true"
type="Int32"/>
</map>
插入完美的作品,但是从数据库加载时( SQLITE)我收到一个异常:
Spring.Data.NHibernate.HibernateSystemException: could not initialize a collection:
[Com.QueoMedia.CO2Simulationstool.Domain.AffectedVehicleInScenario._installationRates#1][SQL: SELECT installat0_.AffectedVehicleInScenarioId as Affected1_0_, installat0_.InstallationRate as Installa2_0_, installat0_.Year as Year0_ FROM tblInstallationRatesOfAffectedVehicleInScenario installat0_ WHERE installat0_.AffectedVehicleInScenarioId=?]
---> NHibernate.Exceptions.GenericADOException: could not initialize a collection:
[Com.QueoMedia.CO2Simulationstool.Domain.AffectedVehicleInScenario._installationRates#1][SQL: SELECT installat0_.AffectedVehicleInScenarioId as Affected1_0_, installat0_.InstallationRate as Installa2_0_, installat0_.Year as Year0_ FROM tblInstallationRatesOfAffectedVehicleInScenario installat0_ WHERE installat0_.AffectedVehicleInScenarioId=?]
---> System.InvalidCastException: Die angegebene Umwandlung ist ungültig.
有人可以帮我吗?映射是不正确的还是它在nhibernate中的错误?
在此先感谢
托比
更新: 创建的表如下:
CREATE TABLE tblInstallationRatesOfAffectedVehicleInScenario
(
AffectedVehicleInScenarioId INT not null,
InstallationRate SMALLINT not null,
Year INT not null,
primary key (AffectedVehicleInScenarioId, Year),
constraint FKDF60481555A07D7C foreign key (AffectedVehicleInScenarioId) references tblAffectedVehicleInScenario
)
看起来像列类型不是整数,以我 – Firo 2012-02-20 10:29:06
@Firo:我添加脚本用于创建使用表 – Tobias 2012-02-20 10:35:27