在字符串中生成唯一员工代码

Question

I am implementing Employee Management System in Java. I want employee code to be auto generated on new employee registration and I should be in predefined format. I don't want to use auto incremented integer key as a employee ID. I am using MySQL Database and JDBC API to connect to MySQL. Please suggest me a solution.

Answer 1

如果 ID 的长度无关紧要，只需使用 java.util.UUID 生成通用唯一标识符。

Answer 2

There can be many approaches to generate an employee Id.I am recommending following most commonly used methods.

1) Timestamp Based :- Use UUID from java.util.UUID to generate random ID's based on host and current time.

UUID uuid = UUID.randomUUID(); 

2) Custom Information Based

If you want an employeeId to be generated using Company Initials/Employee's Personal Information,

• Use employee's username and date of birth

• Take a namespace identifier(can be your organisation's name)

  With the hash of unique identifier and username of employee,

   String source = namespace + username + dateofbirth; byte[] bytes = source.getBytes("UTF-8"); UUID uuid = UUID.nameUUIDFromBytes(bytes);

3) Use Company Initials : Lets say your company initials are XYZ.Use a random number generator function to generate any 5 or 6 digit number. Eg. XYZ47899