uuid مخصص typehandler mybatis

Question

أريد إدارة جدول مع مفتاح varchar الأساسية، وهذا في يجب أن يكون كائن Java المعين UUID.

لدي godyodicetagcode: giveacodicetagpre.

وكل هذا: giveacodicetagpre.

على أي حال، حصلت على هذا الاستثناء: giveacodicetagpre.

يبدو أنه لا يسمى TypeHandler الخاص بي (لدي تسجيل بت، ولكن لا يطبع أي شيء). هل هناك شيء خاطيء؟شكرا

Answer 1

Seems kinda odd answering my own question, but i got some help on the mybatis-users list, so i'd like to share some hints here:

Mybatis was trying to "get" a non-existing field: Luckily, one of mybatis developers helped me a while ago, suggesting that the easiest way to get it to work was to add a @Param annotation in the UserMapper to do this thing:

public User selectUserByUUID(@Param("uuid") UUID uuid);

<select id="selectUserByUUID" parameterType="uuid" resultMap="userResultMap"> 
SELECT * FROM user WHERE uuid = #{uuid, typeHandler=com.collective.persistence.typehandlers.UuidTypeHandler, javaType=uuid, jdbcType=VARCHAR}
</select> 

I was stuck in watching the typehandler configuration, but, if I understood it right, this has not much to do with typehandlers, since they are used to "transport and translate" data between the sql table and the java objects (through setter and getters), while my issue was in the handling of methods' parameters. Hope this helps someone.

Answer 2

Your problem is right there in your exception....

There is no getter for property named 'uuid' in 'class java.util.UUID'

Use a parameter type of String, and pass in unique id as an argument. You don't need a type handler.

Answer 3

Also such error could be fixed by adding in mapper file new method with corresponding queue Smth like this:

@Select("SELECT * FROM Users u WHERE u.userUUID = '${uuid}'")
User selectByUserUuid(@Param("uuid") UUID uuid);