java.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Integer
2016-09-27 18:02
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用mybaties开发获取数据库统计数据报: java.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Integer
1.xml文件:
2.serverImpl文件:
3.原因分析:因为BigDecimal不能强制转换成 String类型,要用toString()作为中间桥梁转换。
同理:Object,BigDecimal转换成int doulbe ,long 也是一样的。
4.故修改为:
1.xml文件:
<!-- 积分查询:App端我的积分列表查询,根据用户id和用户类型查询我的总积分 --> <select id="countPointsAvail" parameterType="java.util.Map" resultType="java.util.Map"> select id,user_id AS userId,user_name AS userName,user_type AS userType, sum(points_avail) AS sumPointsAvail from ykat_integral where user_id=#{userId} and user_type=#{userType} and is_del=1 </select>
2.serverImpl文件:
//查询我的总积分 List<Map<String, Object>> sumIntegralList=integralDao.countPointsAvail(paramsMap); Integer sumPointsAvail=(Integer)sumIntegralList.get(0).get("sumPointsAvail");
3.原因分析:因为BigDecimal不能强制转换成 String类型,要用toString()作为中间桥梁转换。
同理:Object,BigDecimal转换成int doulbe ,long 也是一样的。
4.故修改为:
//查询我的总积分 List<Map<String, Object>> sumIntegralList=integralDao.countPointsAvail(paramsMap); Integer sumPointsAvail=Integer.valueOf(sumIntegralList.get(0).get("sumPointsAvail").toString()).intValue();
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