How to use MyBatis extension plugins

The MyBatis extension plugin can be used to extend the functionality of MyBatis, such as custom type handlers, interceptors, generators, etc. The steps for using the MyBatis extension plugin are as follows:

1. Create a class that implements the corresponding interface, for example, a custom type handler should implement the TypeHandler interface, and an interceptor should implement the Interceptor interface.
2. Configure a plugin in the MyBatis configuration file by adding the plugin’s configuration within the tag and specifying the full class name of the plugin.

<plugins>
    <plugin interceptor="com.example.MyPlugin"/>
</plugins>

1. If parameters need to be passed, appropriate setter methods can be added to the implementation class of the plugin and corresponding parameter configurations can be added in the configuration file.

public class MyPlugin implements Interceptor {
    private String myParam;

    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        // 插件逻辑
        return invocation.proceed();
    }

    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    @Override
    public void setProperties(Properties properties) {
        this.myParam = properties.getProperty("myParam");
    }
}

<plugins>
    <plugin interceptor="com.example.MyPlugin">
        <property name="myParam" value="myValue"/>
    </plugin>
</plugins>

1. Load the configuration file with MyBatis’s SqlSessionFactoryBuilder to create a SqlSessionFactory.

String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

1. Create a SqlSession using SqlSessionFactory and perform the corresponding operations.

try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
    // 执行操作
}

By following the above steps, you can create a custom MyBatis extension plugin and utilize it in your project to enhance MyBatis functionality.