unique

问题 EventSourcing works perfectly when we have particular unique EntityID but when I am trying to get information from eventStore other than particular EntityId i am having tough time. I am using CQRS with EventSourcing. As part of event-sourcing we are storing the events in SQL table as columns(EntityID (uniqueKey),EventType,EventObject(eg. UserAdded)). So while storing EventObject we are just serializing the DotNet object and storing it in SQL, So, All the details related to UserAdded event

问题 EventSourcing works perfectly when we have particular unique EntityID but when I am trying to get information from eventStore other than particular EntityId i am having tough time. I am using CQRS with EventSourcing. As part of event-sourcing we are storing the events in SQL table as columns(EntityID (uniqueKey),EventType,EventObject(eg. UserAdded)). So while storing EventObject we are just serializing the DotNet object and storing it in SQL, So, All the details related to UserAdded event

问题 EventSourcing works perfectly when we have particular unique EntityID but when I am trying to get information from eventStore other than particular EntityId i am having tough time. I am using CQRS with EventSourcing. As part of event-sourcing we are storing the events in SQL table as columns(EntityID (uniqueKey),EventType,EventObject(eg. UserAdded)). So while storing EventObject we are just serializing the DotNet object and storing it in SQL, So, All the details related to UserAdded event

问题 I have a simple code which generates random numbers SecureRandom random = new SecureRandom(); ... public int getRandomNumber(int maxValue) { return random.nextInt(maxValue); } The method above is called about 10 times (not in a loop). I want to ensure that all the numbers are unique (assuming that maxValue > 1000 ). Can I be sure that I will get unique numbers every time I call it? If not, how can I fix it? EDIT: I may have said it vaguely. I wanted to avoid manual checks if I really got

问题 A simplified version of my data set would look like: depth value 1 a 1 b 2 a 2 b 2 b 3 c I would like to make a new data set where, for each value of "depth", I would have the cumulative number of unique values, starting from the top. e.g. depth cumsum 1 2 2 2 3 3 Any ideas as to how to do this? I am relatively new to R. 回答1: I find this a perfect case of using factor and setting levels carefully. I'll use data.table here with this idea. Make sure your value column is character (not an

问题 It need not be meaningful words - more like random password generation, but the catch is - they should be unique. I will be using this for some kind of package / product code. Which is the best method available? :) 回答1: It is generally not possible to generate sequences with both unique and random elements: obviously to be unique the algorithm has to take into account the previously generated elements in the sequence, so the next ones will not really be random. Therefore your best bet would

问题 I have CSV file that looks like the following, 1994, Category1, Something Happened 1 1994, Category2, Something Happened 2 1995, Category1, Something Happened 3 1996, Category3, Something Happened 4 1998, Category2, Something Happened 5 I want to create two lists, Category = [Category1, Category2, Category3] and Year = [1994, 1995, 1996, 1998] I want to omit the duplicates in the column. I am reading the file as following, DataCaptured = csv.reader(DataFile, delimiter=',') DataCaptured.next()

问题 I have CSV file that looks like the following, 1994, Category1, Something Happened 1 1994, Category2, Something Happened 2 1995, Category1, Something Happened 3 1996, Category3, Something Happened 4 1998, Category2, Something Happened 5 I want to create two lists, Category = [Category1, Category2, Category3] and Year = [1994, 1995, 1996, 1998] I want to omit the duplicates in the column. I am reading the file as following, DataCaptured = csv.reader(DataFile, delimiter=',') DataCaptured.next()

问题 I use MS SQL Server. Ive been handed some large tables with no constrains on them, no keys no nothing. I know some of the columns have unique values. Is there a smart way for a given table to finde the cols that have unique values ? Right now I do it manually for each column by counting if there is as many DISTINCT values as there are rows in the table. SELECT COUNT(DISTINCT col) FROM table Could prob make a cusor to loop over all the columns but want to hear if someone knows a smarter or

问题 I use MS SQL Server. Ive been handed some large tables with no constrains on them, no keys no nothing. I know some of the columns have unique values. Is there a smart way for a given table to finde the cols that have unique values ? Right now I do it manually for each column by counting if there is as many DISTINCT values as there are rows in the table. SELECT COUNT(DISTINCT col) FROM table Could prob make a cusor to loop over all the columns but want to hear if someone knows a smarter or