【MyBatis】动态 SQL

【MyBatis】动态 SQL

转载：

目录

==========================================

1、if

2、choose when otherwise

3、trim where set

4、foreach

5、bind

==========================================

1、if

    <select id="selectAuthor" resultType="Author">
        select * from author where sex = 'male'
        <if test="name != null">
            and name = #{name}
        </if>
    </select>

5、bind

基本参数

public List<Blog> selectBlogList(@Param("title") String title);

    <select id="selectBlogList" resultType="Blog">
        <bind name="titlePattern" value="'%' + title + '%'"/>
        select * from blog
        <where>
            <if test="title != null">
            and title like #{titlePattern}
            </if>
        </where>
    </select>

对象参数

public List<Blog> selectBlogList(Blog blog);

<select id="selectBlogList" resultType="Blog">
        <bind name="titlePattern" value="'%' + _parameter.getTitle() + '%'"/>
        select * from blog
        <where>
            <if test="title != null">
            and title like #{titlePattern}
            </if>
        </where>
    </select>