NHibernate存储库模式问题
我正在应用程序中使用NHibernate和存储库模式。但不想使用UnitofWork模式 我的应用程序中有两种类型的表单。集合/选择器表单和实体表单 但是当一个表单从另一个表单中显示时,就会出现问题 当我执行任何与数据库相关的操作时,NHibernate会给我“一个具有相同标识符值的不同对象已与会话关联:XYZ”错误。这是由于CLR延迟调用Dispose方法造成的,据我猜测,我的问题的另一部分在会话管理中 如何更改存储库代码以解决问题 记住,我不想在我的存储库中公开单独的BeginTransaction()、CommitTransaction()类函数。这些东西应该像我已经做的那样嵌入到每个方法{SaveOrUpdate()、Save()、Delete、Load()等}中 请告诉我,我怎样才能使事情顺利进行的小变化 我是这样做的: 选择器窗体的工作方式如下所示NHibernate存储库模式问题,nhibernate,repository-pattern,session-management,Nhibernate,Repository Pattern,Session Management,我正在应用程序中使用NHibernate和存储库模式。但不想使用UnitofWork模式 我的应用程序中有两种类型的表单。集合/选择器表单和实体表单 但是当一个表单从另一个表单中显示时,就会出现问题 当我执行任何与数据库相关的操作时,NHibernate会给我“一个具有相同标识符值的不同对象已与会话关联:XYZ”错误。这是由于CLR延迟调用Dispose方法造成的,据我猜测,我的问题的另一部分在会话管理中 如何更改存储库代码以解决问题 记住,我不想在我的存储库中公开单独的BeginTrans
private void btnPick_Click(object sender, EventArgs e)
{
CourseCollectionForm f = new CourseCollectionForm();
f.FormViewMode = FormViewMode.MultiplePicker;
f.ShowDialog();
int totalCredits = 0;
int totalHours = 0;
FillDataGridViewWithCourses(f.PickedCourseCollection, ref totalCredits, ref totalHours);
FillTotal(totalCredits, totalHours);
}
public partial class DepartmentEntityForm : Form
{
private DepartmentRepository _deptRepository = null;
private Department _currentDepartment = null;
private FormViewMode _currentMode = FormViewMode.None;
public DepartmentEntityForm(Department dept, FormViewMode mode)
{
InitializeComponent();
_deptRepository = new DepartmentRepository();
_currentDepartment = dept;
_currentMode = mode;
if(mode == FormViewMode.Edit)
{
MapObjectToControls();
}
}
private void SaveButton_Click(object sender, EventArgs e)
{
Department newDept;
if (mode == FormViewMode.AddNew)
{
newDept = new Department();
}
else if(mode == FormViewMode.Edit)
{
newDept = _currentDepartment;
}
//.............
//.............
_deptRepository.SaveOrUpdate(newDept);
}
}
保存的工作方式是这样的
private void btnPick_Click(object sender, EventArgs e)
{
CourseCollectionForm f = new CourseCollectionForm();
f.FormViewMode = FormViewMode.MultiplePicker;
f.ShowDialog();
int totalCredits = 0;
int totalHours = 0;
FillDataGridViewWithCourses(f.PickedCourseCollection, ref totalCredits, ref totalHours);
FillTotal(totalCredits, totalHours);
}
public partial class DepartmentEntityForm : Form
{
private DepartmentRepository _deptRepository = null;
private Department _currentDepartment = null;
private FormViewMode _currentMode = FormViewMode.None;
public DepartmentEntityForm(Department dept, FormViewMode mode)
{
InitializeComponent();
_deptRepository = new DepartmentRepository();
_currentDepartment = dept;
_currentMode = mode;
if(mode == FormViewMode.Edit)
{
MapObjectToControls();
}
}
private void SaveButton_Click(object sender, EventArgs e)
{
Department newDept;
if (mode == FormViewMode.AddNew)
{
newDept = new Department();
}
else if(mode == FormViewMode.Edit)
{
newDept = _currentDepartment;
}
//.............
//.............
_deptRepository.SaveOrUpdate(newDept);
}
}
我声明我的个人存储库如下:
FacultyRepository.cs
好的,伙计们!我已经很久没有发布我的问题了,没有人愿意回答 我通过在
SessionFactory
中设置ISession static
解决了这个问题,并没有为每个存储库返回一个打开的ISession
,而是只返回一个static
ISession
public class Repository<T> : IRepository<T>
{
ISession _session;
public Repository()
{
_session = SessionFactory.GetOpenSession();
}
public T Get(object id)
{
T obj = default(T);
try
{
if (!_session.Transaction.IsActive)
{
_session.BeginTransaction();
obj = (T)_session.Get<T>(id);
_session.Transaction.Commit();
_session.Flush();
}
else
{
throw new Exception(CustomErrorMessage.TransactionAlreadyInProgress);
}
}
catch (Exception ex)
{
_session.Transaction.Rollback();
_session.Clear();
throw ex;
}
return obj;
}
public IEnumerable<T> Get(string fieldName, object fieldValue)
{
IEnumerable<T> list = null;
try
{
if (!_session.Transaction.IsActive)
{
_session.BeginTransaction();
list = (IEnumerable<T>)_session.CreateCriteria(typeof(T))
.Add(new NHibernate.Expression.EqExpression(fieldName, fieldValue))
.List<T>();
_session.Transaction.Commit();
_session.Flush();
}
else
{
throw new Exception(CustomErrorMessage.TransactionAlreadyInProgress);
}
}
catch (Exception ex)
{
_session.Transaction.Rollback();
_session.Clear();
throw ex;
}
return list;
}
public IEnumerable<T> Get()
{
IEnumerable<T> list = null;
try
{
if (!_session.Transaction.IsActive)
{
_session.BeginTransaction();
list = (IEnumerable<T>)_session.CreateCriteria(typeof(T)).List<T>();
_session.Transaction.Commit();
_session.Flush();
}
else
{
throw new Exception(CustomErrorMessage.TransactionAlreadyInProgress);
}
}
catch (Exception ex)
{
_session.Transaction.Rollback();
_session.Clear();
throw ex;
}
return list;
}
public void SaveOrUpdate(T obj)
{
try
{
if (!_session.Transaction.IsActive)
{
_session.BeginTransaction();
_session.SaveOrUpdateCopy(obj);
_session.Transaction.Commit();
_session.Flush();
}
else
{
throw new Exception(CustomErrorMessage.TransactionAlreadyInProgress);
}
}
catch (Exception ex)
{
_session.Transaction.Rollback();
_session.Clear();
throw ex;
}
}
public void SaveOrUpdate(IEnumerable<T> objs)
{
try
{
if (!_session.Transaction.IsActive)
{
_session.BeginTransaction();
foreach (T obj in objs)
{
_session.SaveOrUpdate(obj);
}
_session.Transaction.Commit();
_session.Flush();
}
else
{
throw new Exception(CustomErrorMessage.TransactionAlreadyInProgress);
}
}
catch (Exception ex)
{
_session.Transaction.Rollback();
_session.Clear();
throw ex;
}
}
public void Delete(T obj)
{
try
{
if (!_session.Transaction.IsActive)
{
_session.BeginTransaction();
_session.Delete(obj);
_session.Transaction.Commit();
_session.Flush();
}
else
{
throw new Exception(CustomErrorMessage.TransactionAlreadyInProgress);
}
}
catch (Exception ex)
{
_session.Transaction.Rollback();
_session.Clear();
throw ex;
}
}
public void Delete(IEnumerable<T> objs)
{
try
{
if (!_session.Transaction.IsActive)
{
_session.BeginTransaction();
foreach (T obj in objs)
{
_session.Delete(obj);
}
_session.Transaction.Commit();
_session.Flush();
}
else
{
throw new Exception(CustomErrorMessage.TransactionAlreadyInProgress);
}
}
catch (Exception ex)
{
_session.Transaction.Rollback();
_session.Clear();
throw ex;
}
}
public void DeleteAll()
{
try
{
if (!_session.Transaction.IsActive)
{
_session.BeginTransaction();
DetachedCriteria criterion = DetachedCriteria.For<T>();
IList<T> list = criterion.GetExecutableCriteria(_session).List<T>();
foreach (T item in list)
{
_session.Delete(item);
}
_session.Transaction.Commit();
_session.Flush();
}
else
{
throw new Exception(CustomErrorMessage.TransactionAlreadyInProgress);
}
}
catch (Exception ex)
{
_session.Transaction.Rollback();
throw ex;
}
}
public void Dispose()
{
if (_session != null)
{
_session.Clear();
_session.Close();
_session = null;
}
}
}
public class SessionFactory
{
private static ISessionFactory _sessionFactory = null;
private SessionFactory(){}
static SessionFactory()
{
if (_sessionFactory == null)
{
Configuration configuration = new Configuration();
configuration.Configure();
_sessionFactory = configuration.BuildSessionFactory();
}
}
public static ISession GetOpenSession()
{
return _sessionFactory.OpenSession();
}
}