alphamikle

typedef Creator<TDataType> = void Function(BackendArgument<TDataType> argument);

void createFirstBackend(BackendArgument<void> argument) {
  FirstBackend(argument.toFrontend);
}

@protected
Future<void> initBackend<TDataType extends Object>(Creator<TDataType> creator, {TDataType data, ErrorHandler errorHandler}) async {
  /// ...
}

alphamikle

// ...
SELECT "User"."id" AS "User_id", "User"."name" AS "User_name", "User"."defaultPurseId" AS "User_defaultPurseId"  
FROM "user" "User"  
WHERE "User"."id" IN ($1)
START TRANSACTION  
UPDATE "purse"  
SET "balance" = $2  
WHERE "id" IN ($1)  
COMMIT  
SELECT "Purse"."id" AS "Purse_id", "Purse"."balance" AS "Purse_balance", "Purse"."userId" AS "Purse_userId"  

alphamikle

START TRANSACTION
// ...
SELECT "Purse"."id" AS "Purse_id", "Purse"."balance" AS "Purse_balance", "Purse"."userId" AS "Purse_userId"  
FROM "purse" "Purse"  
WHERE "Purse"."id" IN ($1)  
UPDATE "purse"  
SET "balance" = $2  
WHERE "id" IN ($1)  
SELECT "Purse"."id" AS "Purse_id", "Purse"."balance" AS "Purse_balance", "Purse"."userId" AS "Purse_userId"  
FROM "purse" "Purse"  

alphamikle

START TRANSACTION
// ...
SELECT "Purse"."id" AS "Purse_id", "Purse"."balance" AS "Purse_balance", "Purse"."userId" AS "Purse_userId"  
FROM "purse" "Purse"  
WHERE "Purse"."id" IN ($1)  
UPDATE "purse"  
SET "balance" = $2  
WHERE "id" IN ($1)  
ROLLBACK

alphamikle

import { getConnection } from 'typeorm';  
  
await getConnection().transaction(async transactionalEntityManager => {  
  await transactionalEntityManager.save(users);  
  await transactionalEntityManager.save(photos);  
  // ...  
});

alphamikle

@Transaction()  
save(user: User, @TransactionManager() transactionManager: EntityManager) {  
  return transactionManager.save(User, user);
}

alphamikle

START TRANSACTION  
// ...
SELECT "User"."id" AS "User_id", "User"."name" AS "User_name", "User"."defaultPurseId" AS "User_defaultPurseId"  
FROM "user" "User"  
WHERE "User"."id" IN ($1)
START TRANSACTION  // <-- this transaction from appServiceV2 😩
UPDATE "purse"  
SET "balance" = $2  
WHERE "id" IN ($1)  
COMMIT  

alphamikle

START TRANSACTION
// ...
SELECT "Purse"."id" AS "Purse_id", "Purse"."balance" AS "Purse_balance", "Purse"."userId" AS "Purse_userId"  
FROM "purse" "Purse"  
WHERE "Purse"."id" IN ($1)  
START TRANSACTION  
UPDATE "purse"  
SET "balance" = $2  
WHERE "id" IN ($1)  
COMMIT  

alphamikle

// ...
@Post('remittance-with-typeorm-transaction-decorators')  
@ApiResponse({  
  type: RemittanceResultDto,  
})  
async makeRemittanceWithTypeOrmTransactionDecorators(@Body() remittanceDto: RemittanceDto) {  
  return this.appService.makeRemittanceWithTypeOrmV2(remittanceDto.userIdFrom, remittanceDto.userIdTo, remittanceDto.sum, remittanceDto.withError);  
}
// ...

alphamikle

// ..
@Transaction()  
async savePurseInTransaction(purse: Purse, @TransactionManager() transactionManager: EntityManager = null) {  
  await transactionManager.save(Purse, purse);  
}
// ...