//准备转账
private TransactionDocument PrepareTransfer(double amt, string source, string destination)
{
string strGUID = System.Guid.NewGuid().ToString("N"); //类似e0a953c3ee6040eaa9fae2b667060e09
//创建事务文档
TransactionDocument tDoc = new TransactionDocument
{
_id = strGUID, //这个应该是随机生成的一个串
State = "new",
Ts = DateTime.Now,
Amt = amt,
Src = source,
Dst = destination
};
//将事务文档插入事务集合
bool isSu = mongoDBService.Insert(TransactionCollectionName, tDoc);
if (!isSu)
{
throw new Exception("构建事务文档失败！");
}
FilterDefinitionBuilder <Account> filterBuilder = Builders <Account> .Filter;
//更新source账户
FilterDefinition <Account> filterS = filterBuilder.Eq(m => m._id, source) & filterBuilder.Gte(m => m.Balance, amt);
UpdateDefinition <Account> updateS = Builders <Account> .Update.Push(m => m.Txns, tDoc._id).Inc(m => m.Balance, -amt);
UpdateResult updateResult = mongoDBService.DocumentUpdate(AccountsCollectionName, filterS, updateS);
//检测更新是否成功
bool isSuccess = updateResult.ModifiedCount > 0 && updateResult.ModifiedCount == updateResult.MatchedCount?
true:false;
if (!isSuccess)
{
mongoDBService.Delete <TransactionDocument>(TransactionCollectionName, m => m._id == tDoc._id);
throw new Exception("更新source账户失败");
}
//更新destination账户
FilterDefinition <Account> filterD = filterBuilder.Eq(m => m._id, destination);
var updateD = Builders <Account> .Update.Push(m => m.Txns, tDoc._id).Inc(m => m.Balance, amt);
UpdateResult updateResultD = mongoDBService.DocumentUpdate(AccountsCollectionName, filterD, updateD);
bool isSuccessD = updateResultD.ModifiedCount > 0 && updateResultD.ModifiedCount == updateResultD.MatchedCount ?
true : false;
if (!isSuccessD)
{
throw new Exception("更新destination账户失败");
}
return(tDoc);
}
/// <summary>
/// 删除文档
/// </summary>
public void Delete()
{
mongoDBService.Delete <Model2>(collectionName, m => m.Field2A.Equals(DateTime.Parse("2016-09-08")));
}
