asp.net - 我正在使用 sql select 命令选择日期在两个值之间的表中的所有记录

Question

这是我所拥有的，但目前它不起作用..

帮助？

sqlGVQuarterly.SelectCommand = "SELECT [CleaningID], [WorkType], [QuarterSection],
[BasinID], [RecordDate], [TotalFootage], [H2O], [GritRemoved], [StartingStreet],
[LocationPurpose], [Operators], [JobHours], [LaborHours], [ChaseTruckHours],
[VacTruckHours], [JetTruckHours] FROM [SanSewerCleaning] 
WHERE [RecordDate] BETWEEN '1/1/ + ddlSelectYear.SelectedValue' AND '3/31/+ ddlSelectYear.SelectedValue'"

Answer 1

您正在错误地构建字符串：

sqlGVQuarterly.SelectCommand = "SELECT [CleaningID], [WorkType], [QuarterSection],
[BasinID], [RecordDate], [TotalFootage], [H2O], [GritRemoved], [StartingStreet],
[LocationPurpose], [Operators], [JobHours], [LaborHours], [ChaseTruckHours],
[VacTruckHours], [JetTruckHours] FROM [SanSewerCleaning] 
WHERE [RecordDate] BETWEEN '1/1/"  + ddlSelectYear.SelectedValue +
"' AND '3/31/" + ddlSelectYear.SelectedValue + "'";

Answer 2

此外，如果您的时间/日期值默认为午夜，您将获得：

开始：1/1/YYYY 00:00:00 结束：3/31/YYYY 00:00:00

任何时间戳为 3 月 31 日午夜之后的记录都不会包含在您选择的记录中。

Answer 3

您正在发送字符串文字“ddlSelectYear.SelectedValue”。确保在“1/1/”之后和“AND”之前有双引号。

您的代码应如下所示：

sqlGVQuarterly.SelectCommand = "SELECT [CleaningID], [WorkType], [QuarterSection],
[BasinID], [RecordDate], [TotalFootage], [H2O], [GritRemoved], [StartingStreet],
[LocationPurpose], [Operators], [JobHours], [LaborHours], [ChaseTruckHours],
[VacTruckHours], [JetTruckHours] FROM [SanSewerCleaning] 
WHERE [RecordDate] BETWEEN '1/1/" + ddlSelectYear.SelectedValue+"' AND '3/31/"+ ddlSelectYear.SelectedValue+"'";

Answer 4

您使查询字符串错误。我想你想要这样的东西：

sqlGVQuarterly.SelectCommand = "SELECT [CleaningID], [WorkType], [QuarterSection],
[BasinID], [RecordDate], [TotalFootage], [H2O], [GritRemoved], [StartingStreet],
[LocationPurpose], [Operators], [JobHours], [LaborHours], [ChaseTruckHours],
[VacTruckHours], [JetTruckHours] FROM [SanSewerCleaning] 
WHERE [RecordDate] BETWEEN '1/1/" + ddlSelectYear.SelectedValue + "' 
AND '3/31/" + ddlSelectYear.SelectedValue+"'";

因为值 ddlSelectYear.SelectedValue 在 SQL 引擎中不存在，它会抛出一个语法错误

Answer 5

我也会使用 yyyy-M-dd 模式，而不是这样：

WHERE [RecordDate] BETWEEN '" + ddlSelectYear.SelectedValue + "-01-01' AND '" + ddlSelectYear.SelectedValue + "-03-31'"