CODEWITHSUNDEEP
javamybatisibatis
Mihkel L.
Mihkel L.

Reputation: 1573

Inheritance with MyBatis and XML

So I got MyBatis inheritance working with annotations - child inherited @Select functionality. But with XML files it's not working accordingly. It will throw: org.apache.ibatis.binding.BindingException: Invalid bound statement /.../

Saw that some used extends on the mapper element, but for me it says "Attribute extends not allowed here"

Tried <cache/> on parent and <cache-ref namespace="parent"/> on child but that threw org.apache.ibatis.builder.IncompleteElementException: No cache for namespace 'parent'

So how to get MyBatis inheritance working with XML configuration?

Upvotes: 1

Views: 3263

Answers (2)

user2053904
user2053904

Reputation:

I agree whit balckwizzard cache and cache-ref are not useful in this case (I have read too somewhere a post that suggest to use they to extend xml but I think that the post war an error)

I have put an answer that I think is good for you too:
Mybatis Generator: What's the best way to separate out “auto generated” and “hand edited files”

regards

Upvotes: 0

blackwizard
blackwizard

Reputation: 2044

Attribute extends applies to resultMap only.

cache and cache-ref are about cache management.

All what may look like extending is actually factorizing: define sql fragments in a XML mapper and reference them in other mappers. E.g:

-Mapper1.xml:

<sql id="a">/* dummy will never actually been included */</sql>
<sql id="b"> something common to include </sql>
<sql id="template">
    <include refid="a" />
    <include refid="Mapper1.b" />
</sql>

-Mapper2.xml

<sql id="a"> something specific to this mapper </sql>
<select id="statement">
    <include refid="Mapper1.template" />
</select>

include tag behaves just like copy/paste of referenced fragments. Then the select statement will yield:

something specific to this mapper
something common to include

The trick is to play with prefixing or not referenced fragments. It may look like overriding.

Upvotes: 1

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