Question

可能重复：
Python JSON serialize a Decimal object

我有以下SQL：

SELECT 
    concat(UNIX_TIMESTAMP(date), '000') as datetime, 
    SUM(royalty_price) as sales 
FROM 
    sales_raw 
GROUP BY 
    datetime

结果如下所示：

datetime        sales
1337151600000   1045.71 (decimal)
1337238000000   478.04
1337324400000   300.96
1337410800000   289.02

由此我得到以下错误：

Exception Type: TypeError at /ajax/graph/
Exception Value: Decimal('1045.71') is not JSON serializable

如何在mysql中将小数转换为可接受的格式以便能够序列化这些数据？

Answer 1

如果必须在MySQL中执行，只需CAST到字符串：

SELECT 
    CONCAT(UNIX_TIMESTAMP(date), '000') AS datetime, 
    CAST(SUM(royalty_price) AS CHAR)    AS sales
FROM 
    sales_raw 
GROUP BY 
    datetime

将MySQL十进制转换为可接受的格式，以便能够序列化它

1 个答案: