MyBatis | Dynamic SQL | if

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="sample.mybatis">

  <select id="selectTest" resultType="sample.mybatis.TestTable">
    select *
      from test_table
     where string_value = 'hoge'
     <if test="numberValue != null"> <!-- Branch with the if tag. -->
       and number_value = #{numberValue}
     </if>
  </select>
</mapper>

package sample.mybatis;

import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class Main {

    public static void main(String[] args) throws Exception {
        try (InputStream in = Main.class.getResourceAsStream("/mybatis-config.xml")) {
            SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);

            try (SqlSession session = factory.openSession()) {
                session
                    .selectList("sample.mybatis.selectTest") // No parameter set.
                    .forEach(System.out::println);

                Map<String, Object> param = new HashMap<>();
                param.put("numberValue", 100);

                session
                    .selectList("sample.mybatis.selectTest", param) // Parameter set.
                    .forEach(System.out::println);
            }
        }
    }
}