无法在一个事务中使用两个EF存储库插入两个一对一实体(方法挂起) [英] Cannot insert two one-to-one entities using two EF repositories in one transaction (method hangs)
问题描述
我有两个通过外键一对一绑定的实体: CreateTenantDto 和 SaasTenantCreateDto .
我需要使用两个存储库(_abpTenantRepository
是 ABP Framework 的第三方存储库的实例)将这些实体插入数据库.我正在尝试为此使用 ABP UnitOfWork 实现.插入 SaasTenantCreateDto 实体后,我试图插入依赖于它的 CreateTenantDto 条目.如果我使用OnCompleted
事件插入 CreateTenantDto 记录-该方法在返回newTenantDto
之前未输入OnCompleted
,而后者又作为null
返回(最终插入了记录,但是如果插入成功,我想返回插入的实体).如果我根本不使用OnCompleted
-该方法将挂起(看起来像数据库锁).如果我使用两个嵌套的 UnitOfWork 对象-该方法也会挂起.如果我将范围用于两个存储库-
I have two entities bound as one-to-one via foreignkey: CreateTenantDto and SaasTenantCreateDto.
I need to use TWO repositories (_abpTenantRepository
is an instance of 3rd party repository from ABP Framework) to insert those entities into DB. I am trying to use ABP UnitOfWork implementation for this. After SaasTenantCreateDto entity is inserted, I am trying to insert CreateTenantDto entry which depends on it. If I use OnCompleted
event to insert a CreateTenantDto record - the method does not enter OnCompleted
before returning newTenantDto
and the latter is returned as a null
(the records are inserted finally, but I want to return the inserted entity if it's inserted successfully). If I don't use OnCompleted
at all - the method hangs (looks like DB lock). If I use two nested UnitOfWork objects - the method hangs as well. If I use the scope for working with two repositories -
using (var scope = ServiceProvider.CreateScope())
{
var unitOfWorkManager = scope.ServiceProvider.GetRequiredService<IUnitOfWorkManager>();
using (var tenantUow = unitOfWorkManager.Begin(new AbpUnitOfWorkOptions { IsTransactional = true }))
{ ... }
}
它也挂起...绝对是锁,它与从新创建的newAbpTenant访问ID有关:我可以在SQL Developer Sessions中看到它
it hangs also... It is definitely the lock and it has to do with accessing the id from the newly created newAbpTenant: I can see that in SQL Developer Sessions
enq:TX-行锁争用
enq: TX - row lock contention
有罪的会话是我的HttpApi主机会话中的另一个.原因可能是因为Oracle文档所说:尽管子表上的INSERT,UPDATE和DELETE语句等待父表的索引上的行锁,但子表上的INSERT,UPDATE和DELETE语句未获得任何锁.要清除的表格." -SaveChangesAsync是否导致新的记录行锁定?
and guilty session is another my HttpApi host session. Probably, the reason is as Oracle doc says: "INSERT, UPDATE, and DELETE statements on the child table do not acquire any locks on the parent table, although INSERT and UPDATE statements wait for a row-lock on the index of the parent table to clear." - SaveChangesAsync causes new record row lock?
如何解决此问题?
//OnModelCreatingBinding
builder.Entity<Tenant>()
.HasOne(x => x.AbpTenant)
.WithOne()
.HasPrincipalKey<Volo.Saas.Tenant>(x => x.Id)
.HasForeignKey<Tenant>(x => x.AbpId);
...
b.Property(x => x.AbpId).HasColumnName("C_ABP_TENANT").IsRequired();
//Mapping ignoration to avoid problems with 'bound' entities, since using separate repositories for Insert / Update
CreateMap<CreateTenantDto, Tenant>().ForMember(x => x.AbpTenant, opt => opt.Ignore());
CreateMap<UpdateTenantDto, Tenant>().ForMember(x => x.AbpTenant, opt => opt.Ignore());
public class CreateTenantDto
{
[Required]
public int Id { get; set; }
...
public Guid? AbpId { get; set; }
public SaasTenantCreateDto AbpTenant { get; set; }
}
public async Task<TenantDto> CreateAsync(CreateTenantDto input)
{
try
{
TenantDto newTenantDto = null;
using (var uow = _unitOfWorkManager.Begin(new AbpUnitOfWorkOptions { IsTransactional = true, IsolationLevel = System.Data.IsolationLevel.Serializable }))
{
var abpTenant = await _abpTenantManager.CreateAsync(input.AbpTenant.Name, input.AbpTenant.EditionId);
input.AbpTenant.MapExtraPropertiesTo(abpTenant);
var newAbpTenant = await _abpTenantRepository.InsertAsync(abpTenant);
await uow.SaveChangesAsync();
var tenant = ObjectMapper.Map<CreateTenantDto, Tenant>(input);
tenant.AbpId = newAbpTenant.Id;
var newTenant = await _tenantRepository.InsertAsync(tenant);
newTenantDto = ObjectMapper.Map<Tenant, TenantDto>(newTenant);
await uow.CompleteAsync();
}
return newTenantDto;
}
//Implementation by ABP Framework
public virtual async Task CompleteAsync(CancellationToken cancellationToken = default)
{
if (_isRolledback)
{
return;
}
PreventMultipleComplete();
try
{
_isCompleting = true;
await SaveChangesAsync(cancellationToken);
await CommitTransactionsAsync();
IsCompleted = true;
await OnCompletedAsync();
}
catch (Exception ex)
{
_exception = ex;
throw;
}
}
推荐答案
我终于使用以下方法解决了这个问题(但是它没有使用两个似乎无法实现的存储库,因为我们需要直接操作DbContext ):
I have finally resolved the problem using the following approach (but it is not using TWO repositories which seems to be impossible to implement, since we need to manipulate DbContext directly):
应用程序服务层:
//requiresNew: true - to be able to use TransactionScope
//isTransactional: false, otherwise it won't be possible to use TransactionScope, since we would have active ambient transaction
using var uow = _unitOfWorkManager.Begin(requiresNew: true);
var abpTenant = await _abpTenantManager.CreateAsync(input.AbpTenant.Name, input.AbpTenant.EditionId);
input.AbpTenant.MapExtraPropertiesTo(abpTenant);
var tenant = ObjectMapper.Map<CreateTenantDto, Tenant>(input);
var newTenant = await _tenantRepository.InsertAsync(tenant, abpTenant);
await uow.CompleteAsync();
return ObjectMapper.Map<Tenant, TenantDto>(newTenant);
存储库(EntityFrameworkCore)层上的手工InsertAsync方法:
Handmade InsertAsync method on Repository (EntityFrameworkCore) layer:
using (new TransactionScope(asyncFlowOption: TransactionScopeAsyncFlowOption.Enabled))
{
var newAbpTenant = DbContext.AbpTenants.Add(abpTenant).Entity;
tenant.AbpId = newAbpTenant.Id;
var newTenant = DbContext.Tenants.Add(tenant).Entity;
if (autoSave)
{
await DbContext.SaveChangesAsync(GetCancellationToken(cancellationToken));
}
return newTenant;
}
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