Question

我正在运行此查询以更新表中的datetime列：

DateTime today = DateTime.Today;
string[] queries = new string[] { "UPDATE *** SET ExpirationDate = " + today.ToString("yyyy/MM/dd"),
"UPDATE *** SET WrittenDate = " + today.ToString("yyyy/MM/dd"),
"UPDATE *** SET SystemDate = " + today.ToString("yyyy/MM/dd"),
"UPDATE *** SET SystemDate = " + today.ToString("yyyy/MM/dd"),
"UPDATE *** SET EventDate = " + today.ToString("yyyy/MM/dd")};

此格式基于我在此线程中发现的内容： Operand type clash: int is incompatible with date + The INSERT statement conflicted with the FOREIGN KEY constraint

但是它不起作用。我知道它们是日期时间字段，因为我可以对它们成功执行DATEADD。我只想将这些列中的所有记录设置为当前日期，但是即使尝试了所有不同的方法，我仍然会遇到相同的错误。预先感谢您的帮助！

Answer 1

SQL中的DATE值必须放在单引号'

中

我正在运行此查询以更新表中的datetime列：

DateTime today = DateTime.Today;
string[] queries = new string[] { "UPDATE *** SET ExpirationDate = '" + today.ToString("yyyy/MM/dd") + "'",
"UPDATE *** SET WrittenDate = '" + today.ToString("yyyy/MM/dd") + "'",
"UPDATE *** SET SystemDate = '" + today.ToString("yyyy/MM/dd") + "'",
"UPDATE *** SET SystemDate = '" + today.ToString("yyyy/MM/dd") + "'",
"UPDATE *** SET EventDate = '" + today.ToString("yyyy/MM/dd") + "'"};

我不确定“ yyyy / MM / dd”，我猜应该将其放置为“ yyyyMMdd”。

操作数类型冲突：当我尝试更新数据库时，int与日期不兼容

1 个答案: