mybatis foreach cannot get a value
my sql
<select id="findByCustomerId" resultMap="BaseResultMap">
SELECT ma.* FROM media_material_relation mr,media_material ma
WHERE mr.material_id = ma.material_id
<if test="customerIds != null">
AND mr.customer_id IN
<foreach item="item" index="index" collection="customerIds" open="(" separator="," close=")">
-sharp{item,jdbcType=INTEGER}
</foreach>
</if>
<if test="type != null and type != """>
AND ma.type = -sharp{type,jdbcType=VARCHAR}
</if>
<if test="width != null and width != 0">
AND ma.width = -sharp{width,jdbcType=INTEGER}
</if>
<if test="height != null and height != 0">
AND ma.height = -sharp{height,jdbcType=INTEGER}
</if>
<if test="fileSize != null and fileSize != 0">
AND ma.fileSize <![CDATA[ <= ]]> -sharp{fileSize,jdbcType=INTEGER}
</if>
</select> request object
sql
