/// <summary>
/// 添加实体
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public static bool Add <T>(T entity) where T : class
{
try
{
using (JinchengDB2Entities _emdc = new JinchengDB2Entities())
{
DbEntityEntry entitEntry = _emdc.Entry <T>(entity);
entitEntry.State = EntityState.Added;
return(_emdc.SaveChanges() > 0);
}
}
catch (DbEntityValidationException e)
{
string exception = "";
foreach (var eve in e.EntityValidationErrors)
{
exception += string.Format("Entity of type \"{0}\" in state \"{1}\" has the following validation errors:",
eve.Entry.Entity.GetType().Name, eve.Entry.State);
foreach (var ve in eve.ValidationErrors)
{
exception += string.Format("- Property: \"{0}\", Error: \"{1}\"",
ve.PropertyName, ve.ErrorMessage);
}
}
exception += "";
throw;
}
}
/// <summary>
/// 针对修改主键的实体操作(先删除后添加)
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="entity"></param>
/// <returns></returns>
public static bool Update <T>(T oldEntity, T newEntity) where T : class
{
bool bResult = false;
try
{
using (JinchengDB2Entities _emdc = new JinchengDB2Entities())
{
DbEntityEntry <T> entry = _emdc.Entry <T>(oldEntity);
entry.State = EntityState.Deleted;
if (_emdc.SaveChanges() > 0)
{
DbEntityEntry <T> entryNew = _emdc.Entry <T>(newEntity);
entryNew.State = EntityState.Added;
bResult = (_emdc.SaveChanges() >= 0);
}
}
}
catch (Exception ex)
{
//
}
return(bResult);
}
/// <summary>
/// 删除实体
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public static bool Remove <T>(T entity) where T : class
{
try
{
using (JinchengDB2Entities _emdc = new JinchengDB2Entities())
{
DbEntityEntry <T> entry = _emdc.Entry <T>(entity);
entry.State = EntityState.Deleted;
return(_emdc.SaveChanges() > 0);
}
}
catch (Exception ex)
{
//throw ex;
return(false);
}
}
/// <summary>
///
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="entity"></param>
/// <returns></returns>
public static bool Update <T>(T entity) where T : class
{
bool bResult = false;
try
{
using (JinchengDB2Entities _emdc = new JinchengDB2Entities())
{
DbEntityEntry <T> entry = _emdc.Entry <T>(entity);
entry.State = EntityState.Modified;
return(_emdc.SaveChanges() >= 0);
}
}
catch (Exception ex)
{
//
}
return(bResult);
}