相关疑难解决方法(0)

我们在项目中要求存储数据库中实体的所有修订(更改历史记录).目前我们有2个设计方案:

例如,对于"员工"实体

设计1:

-- Holds Employee Entity
"Employees (EmployeeId, FirstName, LastName, DepartmentId, .., ..)"

-- Holds the Employee Revisions in Xml. The RevisionXML will contain
-- all data of that particular EmployeeId
"EmployeeHistories (EmployeeId, DateModified, RevisionXML)"

设计2:

-- Holds Employee Entity
"Employees (EmployeeId, FirstName, LastName, DepartmentId, .., ..)"

-- In this approach we have basically duplicated all the fields on Employees 
-- in the EmployeeHistories and storing the revision data.
"EmployeeHistories (EmployeeId, RevisionId, DateModified, FirstName, 
      LastName, DepartmentId, .., ..)"

有没有其他办法做这件事？ …

这是一个虚构的场景,其中包含一些填充数据.出于税收目的,我的虚构公司必须保留历史数据的记录.出于这个原因,我在表格中添加了一个版本列.

TABLE EMPLOYEE: (with personal commentary)

|ID | VERSION | NAME       | Position | PAY |
+---+---------+------------+----------+-----+
| 1 |    1    | John Doe   | Owner    | 100 | Started company
| 1 |    2    | John Doe   | Owner    |  80 | Pay cut to hire a coder
| 2 |    1    | Mark May   | Coder    |  20 | Hire said coder
| 2 |    2    | Mark May   | Coder    |  30 | Productive coder gets raise …