想要显示未插入数据库的日期

Question

我正在从Mysql数据库中检索数据，查询是这样的：

SELECT
DATE(cap_newspaper_page.insertDate) AS _Date,
count(*) AS Image_Captured
FROM
cap_newspaper_page
WHERE 
cap_newspaper_page.insertDate BETWEEN '2012-11-01' AND '2012-11-13'
GROUP BY
DATE(cap_newspaper_page.insertDate)
ORDER BY
DATE(cap_newspaper_page.insertDate)

，数据显示为

但我还想显示未插入数据库的Null值。如2012-11-03,2012-11-04,2012-11-09,2012-11-11未插入数据库但我想将它们显示为Null或0.喜欢

1. 2012-11-01 581
2. 2012-11-02 587
3. 2012-11-03 0 / null
4. 2012-11-04 0 / null
5. 2012-11-05 752
6. 2012-11-06 690
7. 2012-11-07 495
8. 2012-11-08 623
9. 2012-11-09 0 / null
10. 2012-11-10 921
11. 2012-11-11 0 / null
12. 2012-11-12 755

任何想法??

Answer 1

我假设您的日期在从数据库中读取后处于某种数据结构中。让我们假设它可以是一个数组，你可以使用这样的东西（只是一个例子）：

DateTime[] dts = new DateTime[4];
dts[0] = DateTime.Now.AddDays(-15);
dts[1] = DateTime.Now.AddDays(-4);
dts[2] = DateTime.Now.AddDays(1);
dts[3] = DateTime.Now.AddDays(4);

DateTime dtMax = dts.Max();
DateTime dtMin = dts.Min();
string str = string.Empty;
for (DateTime i = dtMin; i <= dtMax; i = i.AddDays(1))
{
     str += i.ToString("MM.dd.yyyy");
     str += Environment.NewLine;
}