How can I add condition clause not required if element?

Question

Let's say I have an interface look like this.

@Mapper
interface UserMapper {
    List<User> search(@Nullable String namePattern, int minAge); 
}

How can I do with the minAge parameter which is not required the <if/> element?

Should I just do with <if test="true"/>?

<where>
  <if test="namePattern != null">
    name LIKE #{namePattern}
  </if>
  <if test="true"> <!-- just true??? -->
    AND age >= #{minAge}
  </if>
</where>

Can I peel the second <if/> element?

<where>
  <if test="namePattern != null">
    name LIKE #{namePattern}
  </if>
  AND age >= #{minAge} <!-- will it blend? -->
</where>

Answer 1

Sure. <where /> removes unnecessary AND, so it should work.

Another approach is to write the age condition in front of <if />s.

WHERE age >= #{minAge}
<if test="namePattern != null">
  AND name LIKE #{namePattern}
</if>