UUID含义是通用唯一识别码 (Universally Unique Identifier)，通俗一点就是一个不重复的字符串，有时会把UUID作为数据库的一个主键，这样就不用担心主键重复的问题。
SAP中有个专门生成CL_SYSTEM_UUID，提供了4个静态方法创建生成不同类型的UUID：2进制，16进制，64位以及32位uuid。
也可以进行不同类型UUID之间的相互转换。
![如何创建,转换UUID[CL_SYSTEM_UUID]详解编程语言](http://blog.ytso.com/img2/c663aa62-6c12-425f-9f08-4a79aa247336.png)
代码：
REPORT ztest_uuid. DATA:l_uuid22 TYPE sysuuid_c22, l_uuid32 TYPE sysuuid_c32, l_uuid26 TYPE sysuuid_c26, l_uuid16 TYPE sysuuid_x16. TRY. CALL METHOD cl_system_uuid=>if_system_uuid_static~create_uuid_x16 RECEIVING uuid = l_uuid16. CATCH cx_uuid_error . ENDTRY. TRY. CALL METHOD cl_system_uuid=>if_system_uuid_static~create_uuid_c22 RECEIVING uuid = l_uuid22. CATCH cx_uuid_error . ENDTRY. TRY. CALL METHOD cl_system_uuid=>if_system_uuid_static~create_uuid_c32 RECEIVING uuid = l_uuid32. CATCH cx_uuid_error . ENDTRY. TRY. CALL METHOD cl_system_uuid=>if_system_uuid_static~create_uuid_c26 RECEIVING uuid = l_uuid26. CATCH cx_uuid_error . ENDTRY. WRITE: `Binary Format UUID:`,l_uuid16. WRITE:/ `Base64 UUID: `,l_uuid22. WRITE:/ `Base32 UUID: `,l_uuid26. WRITE:/ `Hex Format UUID: `,l_uuid32.
运行结果：
![如何创建,转换UUID[CL_SYSTEM_UUID]详解编程语言](http://blog.ytso.com/img2/b22d9d3c-425e-4bc4-bb7e-7c957f344231.png)
也可以通过函数SYSTEM_UUID_CREATE来生成UUID，SE37
![如何创建,转换UUID[CL_SYSTEM_UUID]详解编程语言](http://blog.ytso.com/img2/27126f7b-a73a-4115-a95a-d6452b15fcee.png)
看一下代码，其中也是调用类CL_SYSTEM_UUID创建的二进制类型UUID
![如何创建,转换UUID[CL_SYSTEM_UUID]详解编程语言](http://blog.ytso.com/img2/fd985fbf-92de-4e3f-afe2-d15896ff36a1.png)
以上。
原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/tech/pnotes/19235.html