# MyBatis - Dynamic
## features
1. if
2. choose (when, otherwise)
3. trim (where, set)
4. foreach
## if
<select id="findActiveBlogWithTitleLike" resultType="Blog">
SELECT
*
FROM
BLOG
WHERE
state = ‘ACTIVE’
<if test="title != null">
AND title like #{title}
</if>
<if test="author != null and author.name != null">
AND author_name like #{author.name}
</if>
</select>
## choose, when, foreach
<select id="findActiveBlogLike" resultType="Blog">
SELECT
*
FROM
BLOG
WHERE
state = ‘ACTIVE’
<choose>
<when test="title != null">
AND title like #{title}
</when>
<when test="author != null and author.name != null">
AND author_name like #{author.name}
</when>
<otherwise>
AND featured = 1
</otherwise>
</choose>
</select>
## trim, where, set
- trim은 쓸 일이 없을 것 같다
<select id="findActiveBlogLike" resultType="Blog">
SELECT
*
FROM
BLOG
<where>
<if test="state != null">
state = #{state}
</if>
<if test="title != null">
AND title like #{title}
</if>
<if test="author != null and author.name != null">
AND author_name like #{author.name}
</if>
</where>
</select>
<update id="updateAuthorIfNecessary">
update
Author
<set>
<if test="username != null">username=#{username},</if>
<if test="password != null">password=#{password},</if>
<if test="email != null">email=#{email},</if>
<if test="bio != null">bio=#{bio}</if>
</set>
where
id=#{id}
</update>
## foreach
<select id="selectPostIn" resultType="domain.blog.Post">
SELECT
*
FROM
POST P
<where>
<foreach item="item" index="index" collection="list" open="ID in (" separator="," close=")" nullable="true">
#{item}
</foreach>
</where>
</select>
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