Jdbc3KeyGenerator cannot get correct key property object

[Huang Dan]

Hi Team,

I recently upgrade mybatis from 3.4.6 to 3.5.10, then I got failure in my project. (no setter for keyProperty "id"...)

After debugging into the code, I found the issue was in Jdbc3KeyGenerator.

Background: 

• I has a custom batchInsert method in xxMapper interface with a custom SQL in xml file(insert ... values ...). The xml SQL has properties of useGeneratedKeys="true" keyProperty="id". (my entity class does have a Long type id with @TableId(value = "id", type = IdType.AUTO) annotation)
  
• The batchInsert in mapper method has an annotation of @Param(list) on the single parameter of ArrayList.
  • int batchInsert(@Param("list") List<Data> dataList);
• I have a spring interceptor which will do some special logic before insert/update statement processing in mybatis Executor update method. Actually, the interceptor will add a property called "tenantId" to the paramMap if the param was MapperMethod.ParamMap type. The tenantId in the paramMap can be referenced  in XML SQL without need it passed in from mapper method.
• Thus, when batchInsert execute into mybatis framework, the paramMap will contain three elements: list, param1, and "tenantId".
• In Jdbc3KeyGenerator -> getAssignerForParamMap, the singleParam only check if there has no "param2", however, another param "tenantId" has been introduced in my interceptor. Thus, the "tenentId" (java.lang.Long) will be returned as the object which contains "keyProperty" and eventually failed in keyProperty setter check
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• Howevet, in mybatis 3.4.6, the code works fine.
• 
  

Forgive my poor English, could someone help to fix this issue?

[Iwao AVE!]

Hello,

You should not modify the parameter map like that.

It interferes with the internal logic as you found out.

If you explain what you try to achieve by adding the extra parameter, we might be able to provide a better solution.

If, for example, it is for a multi-tenant application, the answers on this question might be helpful:

https://stackoverflow.com/q/9430294/1261766

Regards,

Iwao

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