Provide support for JSON like field types in any Database. I'm developed this handler with PostgreSql in mind, but it looks like it can be used with any other database even without JSON support.
Artifact does not include direct gson dependencies - it is up to you to add them into your project. Looks like you can use any Gson version compatible with API version >= 2.3
##How does it work Because JDBC does not support JSON types, it transfer JSON to/from database as a string. It serialize JSON to string on save and deserialize from string on read. This feature means that we are really do not care if our DB can support JSON or not.
###Lazy reading Type handler returns TreeNode wrapper that actually does not parse JSON from string. It is waiting for you to call any of its methods - only then it will read JSON into structure. But this approach may lead to unexpected runtime exception in a case if your database will return invalid JSON string.
##Add to your project
You can add this artifact to your project using JitPack.
All versions list, instructions for gradle, maven, ivy etc. can be found by link above.
To get latest commit use -SNAPSHOT instead version number.
In result map configuration you should use javaType=com.google.gson.JsonElement"
You should not configure anything if you want to use JsonElement types as arguments in your mapper functions, but keep in mind that handler only expect objects of type JsonArray or JsonObject.
<!-- mybatis-config.xml -->
<typeHandlers>
<typeHandler handler="com.github.jneat.mybatis.JsonElementTypeHandler"/>
</typeHandlers>
Or you can use package search
<!-- mybatis-config.xml -->
<typeHandlers>
<package name="com.github.jneat.mybatis"/>
</typeHandlers>
<bean id="SomeId" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- your configuration -->
<property name="typeHandlersPackage" value="com.github.jneat.mybatis" />
</bean>