Passing multiple columns in myBatis

Question

I want to know, how do we pass multiple columns in a myBatis association tag.

For example, I have the following xml snippet in one my mapper.xml file:

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Answer 1

You should use the following syntax for composite keys:

column="{prop1=col1,prop2=col2}".

Where prop1, prop2 are parameters of the associated query and col1, col2 are sql columns passed to that query.

In your case:

CourseMapper.xml:

column="{courseId=id,userId=user_id}" 
...
select id, user_id, ... from course ...

CourseSubscriptionMapper.xml:

    select ... where course_id=#{courseId} and user_id=#{userId}

I just checked it worked fine for me. If you have any questions, please feel free to ask.