Oracle数据库使用身份证计算处于哪个年龄段（Java的SSM框架）

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这个需求我是实现了，但是在代码的优化上没有做到位，其实可以写的更加简洁，但是因为时间紧，就没有想那么多。下面附上Java接口逻辑代码和mybatis的SQL代码：

    /**
     * 使用身份证判断年龄段
     * @param addressid
     * @return
     */
    @RequestMapping("/toAge")
    @ResponseBody
    public Object toAge(String id,String type){
        Map<String, Object> map=new HashMap<String, Object>();
        Subject currentUser = SecurityUtils.getSubject(); 
        String userid = currentUser.getSession().getAttribute("_USER_ID").toString();
        List<Community> age=dataAnalyzeService.selectAddressAge(id,type,userid);
        //初始化参数
        int c1=0;int c2=0;int c3=0;
        int c4=0;int c5=0;int c6=0;
        for(int i=0;i<age.size();i++){
            String group=age.get(i).getAge_group();//循环得出年龄段对比后传值
            Integer count=age.get(i).getAge_count();
            if(group.equals("0~18")){
                c1=count;
            }
            if(group.equals("19~30")){
                c2=count;
            }
            if(group.equals("31~40")){
                c3=count;
            }
            if(group.equals("41~50")){
                c4=count;
            }
            if(group.equals("51~60")){
                c5=count;
            }
            if(group.equals("60以上")){
                c6=count;
            }
        }
        map.put("c1", c1);//以此存入map中
        map.put("c2", c2);
        map.put("c3", c3);
        map.put("c4", c4);
        map.put("c5", c5);
        map.put("c6", c6);
        return map;
    }

    <!--使用身份证判断年龄段 -->
    <select id="selectAddressAge" resultType="com.oracle.pojo.Community" parameterType="java.lang.String">
    select  
    case 
        when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 0
                     and months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &lt; 19
                     then '0~18'
         when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 19
                     and months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &lt; 31
                     then '19~30'
         when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 31
                     and months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &lt; 41
                     then '31~40'
         when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 41
                     and months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &lt; 51
                     then '41~50'
         when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 51
                     and months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &lt; 60
                     then '51~60'
         when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 60
                     then '60以上' 
    end age_group, count(1) AS age_count    from cmu_userdevice e
        LEFT JOIN cmu_subscriber a ON a.COMMUNITYKEY =e.COMMUNITYKEY
        LEFT JOIN CMU_CUSTOMER t ON t.SUBSCRIBERKEY = a.SUBSCRIBERKEY
        LEFT JOIN CMU_COMMUNITY c ON c.COMMUNITYKEY = a.COMMUNITYKEY
        RIGHT OUTER JOIN 
        (select * from CMU_USERS start with USER_ID = #{userid,jdbcType=VARCHAR} connect by prior USER_ID = PID) f ON e.USER_ID = f.USER_ID 
        WHERE
            <if test="type == 1">
                c.PROVINCEID = #{id, jdbcType=VARCHAR}
            </if> 
            <if test="type == 2">
                c.cityid = #{id, jdbcType=VARCHAR}
            </if> 
            <if test="type == 3">
                c.areaid = #{id, jdbcType=VARCHAR}
            </if>
            <if test="type == 4">
                c.ADDRESSID = #{id, jdbcType=VARCHAR}
            </if>
            AND t.identity is NOT NULL
    group by 
    case
        when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 0
                     and months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &lt; 19
                     then '0~18'
        when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 19
                     and months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &lt; 31
                     then '19~30'
        when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 31
                     and months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &lt; 41
                     then '31~40'
        when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 41
                     and months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &lt; 51
                     then '41~50'
        when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 51
                     and months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &lt; 60
                     then '51~60'
        when months_between(sysdate,to_date(substr(t.identity,7,8),'yyyymmdd'))/12 &gt;= 60
                     then '60以上'
    end 
    ORDER BY instr('0~18 19~30 31~40 41~50 51~60 60以上',NULL)
    </select>

详解：在接口中，我直接简单的使用的if进行区分，取出值以后就直接通过Map返回给了前端，前端使用ECharts图表对数据进行展示，因为前后端都是我一个人编写的，所以优化方面做的不太到位！请不要喷我！
SQL解释：首先SQL的if块你们不需要去看，这是我自己需求需要的 还有相关的表结构必须写的关联表语句，大家只需要了解sql语句的头部和尾部，t.identity是身份证的列，你需要更换为自己的列，还有年龄范围的更改，也可以改为你自己划分的范围，但是group up 需要与其同步更改！
前端效果图：