public SaveResult SaveChanges(JObject saveBundle, TransactionSettings transactionSettings = null) {
JsonSerializer = CreateJsonSerializer();
var dynSaveBundle = (dynamic)saveBundle;
var entitiesArray = (JArray)dynSaveBundle.entities;
var dynSaveOptions = dynSaveBundle.saveOptions;
SaveOptions = (SaveOptions) JsonSerializer.Deserialize(new JTokenReader(dynSaveOptions), typeof(SaveOptions));
SaveWorkState = new SaveWorkState(this, entitiesArray);
transactionSettings = transactionSettings ?? BreezeConfig.Instance.GetTransactionSettings();
try {
if (transactionSettings.TransactionType == TransactionType.TransactionScope) {
var txOptions = transactionSettings.ToTransactionOptions();
using (var txScope = new TransactionScope(TransactionScopeOption.Required, txOptions)) {
OpenAndSave(SaveWorkState);
txScope.Complete();
}
} else if (transactionSettings.TransactionType == TransactionType.DbTransaction) {
this.OpenDbConnection();
using (IDbTransaction tran = BeginTransaction(transactionSettings.IsolationLevelAs)) {
try {
OpenAndSave(SaveWorkState);
tran.Commit();
} catch {
tran.Rollback();
throw;
}
}
} else {
OpenAndSave(SaveWorkState);
}
} catch (EntityErrorsException e) {
// SaveWorkState.EntityErrors = e.EntityErrors;
var error = new SaveError(e.EntityErrors);
var resp = new HttpResponseMessage(e.StatusCode) {
Content = new ObjectContent(typeof(SaveError), error, JsonFormatter.Create()),
ReasonPhrase = e.Message ?? "Entity Errors exception"
};
throw new HttpResponseException(resp);
} catch(Exception e2) {
if (!HandleSaveException(e2, SaveWorkState)) {
throw;
}
} finally {
CloseDbConnection();
}
return SaveWorkState.ToSaveResult();
}
/// <summary>
/// Perform the actual work of saving the entity data to the database.
/// </summary>
/// <param name="saveWorkState"></param>
protected override void SaveChangesCore(SaveWorkState saveWorkState)
{
var saveMap = saveWorkState.SaveMap;
var conn = _dbConnection;
foreach (var type in saveMap.Keys)
{
List<EntityInfo> entityInfos = saveMap[type];
if (type == typeof(Customer))
{
SaveCustomers(conn, entityInfos);
}
else
{
throw new Exception("Unable to handle saving type " + type.Name);
}
}
}
public void SaveChanges(Breeze.WebApi.SaveWorkState saveWorkState)
{
//get your custom saving logic here, for demo purposes this will be very simplistic...
EntityInfo info = saveWorkState.EntitiesWithAutoGeneratedKeys.Where(e => e.Entity.GetType() == typeof(ProductDTO)).FirstOrDefault();
var dto = (info.Entity as ProductDTO);
//get dbcontext
var context = new SummerBreezeDbContext();
//map dto to product
context.Products.Add(new Product()
{
Name = dto.Name,
PicUrl = dto.PicUrl,
Price = dto.Price,
RegisteredDate = DateTime.Now,
Tags = dto.Name
});
//save changes on the db
context.SaveChanges();
// Add new keymappings to breeze (remember we told breeze to generate a temp id, this is the way breeze knows about the new generated id)
List <KeyMapping> mappings = new List <KeyMapping>();
mappings.Add(new KeyMapping()
{
EntityTypeName = dto.GetType().FullName,
RealValue = context.Products.Where(p => p.Name == dto.Name).FirstOrDefault().ProductId,
TempValue = dto.ProductDTOId
});
saveWorkState.KeyMappings = mappings;
}
protected abstract void SaveChangesCore(SaveWorkState saveWorkState);
private void OpenAndSave(SaveWorkState saveWorkState) {
OpenDbConnection(); // ensure connection is available for BeforeSaveEntities
saveWorkState.BeforeSave();
SaveChangesCore(saveWorkState);
saveWorkState.AfterSave();
}
// allows subclasses to plug in own save exception handling
// either throw an exception here, return false or return true and modify the saveWorkState.
protected virtual bool HandleSaveException(Exception e, SaveWorkState saveWorkState) {
return false;
}
protected override void SaveChangesCore(SaveWorkState saveWorkState) {
throw new NotImplementedException();
}
protected abstract void SaveChangesCore(SaveWorkState saveWorkState);
// allows subclasses to plug in own save exception handling
// either throw an exception here, return false or return true and modify the saveWorkState.
protected virtual bool HandleSaveException(Exception e, SaveWorkState saveWorkState)
{
return(false);
}
protected override void SaveChangesCore(SaveWorkState saveWorkState)
{
Context.SaveChanges(saveWorkState);
}
protected override void SaveChangesCore(SaveWorkState saveWorkState)
{
var saveMap = saveWorkState.SaveMap;
var deletedEntities = ProcessSaves(saveMap);
if (deletedEntities.Any())
{
ProcessAllDeleted(deletedEntities);
}
ProcessAutogeneratedKeys(saveWorkState.EntitiesWithAutoGeneratedKeys);
int count;
try {
if (Context is DbContext)
{
count = ((DbContext)(object)Context).SaveChanges();
}
else
{
count = ObjectContext.SaveChanges(System.Data.Objects.SaveOptions.AcceptAllChangesAfterSave);
}
} catch (DbEntityValidationException e) {
var entityErrors = new List <EntityError>();
foreach (var eve in e.EntityValidationErrors)
{
var entity = eve.Entry.Entity;
var entityTypeName = entity.GetType().FullName;
Object[] keyValues;
var key = ObjectContext.ObjectStateManager.GetObjectStateEntry(entity).EntityKey;
if (key.EntityKeyValues != null)
{
keyValues = key.EntityKeyValues.Select(km => km.Value).ToArray();
}
else
{
var entityInfo = saveWorkState.EntitiesWithAutoGeneratedKeys.FirstOrDefault(ei => ei.Entity == entity);
if (entityInfo != null)
{
keyValues = new Object[] { entityInfo.AutoGeneratedKey.TempValue };
}
else
{
// how can this happen?
keyValues = null;
}
}
foreach (var ve in eve.ValidationErrors)
{
var entityError = new EntityError()
{
EntityTypeName = entityTypeName,
KeyValues = keyValues,
ErrorMessage = ve.ErrorMessage,
PropertyName = ve.PropertyName
};
entityErrors.Add(entityError);
}
}
saveWorkState.EntityErrors = entityErrors;
} catch (Exception) {
throw;
}
saveWorkState.KeyMappings = UpdateAutoGeneratedKeys(saveWorkState.EntitiesWithAutoGeneratedKeys);
}
public void SaveChanges(SaveWorkState saveWorkState)
{
lock (__lock)
{
_keyMappings.Clear();
var saveMap = saveWorkState.SaveMap;
SaveTodoLists(saveMap);
SaveTodoItems(saveMap);
// ToList effectively copies the _keyMappings so that an incoming SaveChanges call doesn't clear the
// keyMappings before the previous version has completed serializing.
saveWorkState.KeyMappings = _keyMappings.ToList();
}
}
