mapper-demo.xml

<?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="demo">

	<sql id="sql_a">
		, (select 1 from dual)
	</sql>

	<sql id="sql_b">
	a,b,c,d
	</sql>

	<sql id="sql_c">
	e,f,g,h,i
	</sql>

	<sql id="sql_d">
		<include refid="sql_b"/>
		,
		<include refid="sql_c"/>
	</sql>

  <sql id="sql1">
    select a,b,c,d,e,f,g
  </sql>

	<sql id="sql2">
	  <include refid="sql1"/>
	</sql>

	<sql id="sql3">
	  <include refid="sql2"/>
	</sql>

	<sql id="sql4">
	  <include refid="sql3"/>
	</sql>

	<sql id="sql5">
	  <include refid="sql4"/>
	</sql>

	<sql id="sql6">
	  <include refid="sql5"/>
	</sql>

  <select id="select0">
    <include refid="sql5" />
    from tab1
  </select>

	<insert id="insert">
		<selectKey keyProperty="a">
			select 1 from dual
		</selectKey>
		insert into tab1(a,b,c,d) values (#{a},#{b},#{c},#{d})
	</insert>

	<select id="select">
		SELECT * FROM tab1 where column1 in
		<foreach collection="list" index="index" item="item" open="(" separator="," close=")">
            #{item}
        </foreach>
	</select>

	<select id="select1">
		SELECT 
		<include refid="sql_b"/>
		,
		<include refid="sql_c"/>
		 FROM tab1 where column1 in
		<foreach collection="list" index="index" item="item" open="(" separator="," close=")">
            #{item}
        </foreach>
	</select>

	<select id="select11">
		SELECT 
		<include refid="sql_d"/>
		 FROM tab1 where column1 in
		<foreach collection="list" index="index" item="item" open="(" separator="," close=")">
            #{item}
        </foreach>
	</select>

	<insert id="insert2">
		insert into tab2
		<trim prefix="(" suffix=")" suffixOverrides=",">
			<if test="id != null">
				ID,
			</if>
		</trim>
		<trim prefix="values (" suffix=")" suffixOverrides=",">
			<if test="id != null">
				#{id,jdbcType=VARCHAR},
			</if>
		</trim>
	</insert>

	<select id="select2">
		select column1, column2
		<include refid="sql_a" />
		from tab3
		<where>
			<if test="1 == 1">
				and column1 = #{column1}
			</if>
		</where>
		order by column2 desc
	</select>

	<update id="update">
		update tab1
		<set>
			<if test="1 == 1">
				column1 = #{column1}
			</if>
		</set>
		<where>
			<if test="1 == 1">
				and column1 = #{column1}
			</if>
		</where>
	</update>

	<delete id="delete">
		delete from tab1 where column1 = #{item.column1} and column2 = #{item.column2}
	</delete>

</mapper>