<select id="queryMessageList" parameterType="com.imooc.bean.Message"
    resultMap="MessageResult">
    select ID,COMMAND,DESCRIPTION,CONTENT from MESSAGE where 1=1
    <if test="command !=null &&!"".equals(command.trim())">
      and COMMAND=#{command}
    </if>
    <if test="description != null and !"".equals(description.trim())">
      and DESCRIPTION like '%' #{description} '%'
    </if>
  </select>

<delete id="deleteOne" parameterType="int">
    delete from MESSAGE WHERE ID = #{_parameter}
</delete>

  <delete id="deleteBatch" parameterType="java.util.List">
    delete from MESSAGE WHERE ID in (
    <foreach collection="list" item="item" separator=",">
      #{item}
    </foreach>
    )
  </delete>