从字符串 DateTime 转换日期和/或时间时转换失败

Question

public static DataTable ReportsCityFilter(DateTime dtStart, DateTime dtEnd)
{
        //Dictionary<DateTime.TryParse((string DateString, IFormatProvider provider, System.Globalization.DateTimeStyles styles, "ddMMyyyy"), object> objDic = new Dictionary<DateTime, object>();

        Dictionary<string, object> objDic = new Dictionary<string, object>();
        objDic.Add("@start_date", dtStart);
        objDic.Add("@end_date", dtEnd);

        return dal.execute(objDic, "sp_admin_reports_city_filter_select").Tables[0];
}

我有一个按城市报告的页面，现在我在其上添加了一个下拉列表以按日期过滤结果，即周、今天、月、年等

其他一切正常，但这段代码有问题，因为它给我错误“从字符串转换日期和/或时间时转换失败。”

附：这是我的存储过程

更改程序 [dbo].[sp_admin_reports_city_filter_select] -- 这里添加存储过程的参数 --@id INT = NULL @start_date 日期时间 , @end_date 日期时间 作为 开始 --declare @startdate 日期时间 设置@start_date = '2999-01-01'

if @start_date = 'today'
begin
    select jp.id, city.name[City]
    , row_number() over (order by city.name) [sr_no]
    , count(jp.id) over (partition by name) as no_of_posts 
    , COUNT(od.id) over (partition by name) as no_of_employers
    ,CONVERT(varchar(12), jp.posting_date, 103) [date_created]

    from rs_job_posting jp

    inner join rs_job_posting_location jpl on jpl.id = jp.id
    inner join rs_cor_city city on city.id = jpl.city_fk
    inner join rs_organization_detail od on od.id = jp.id

    where DAY(posting_date) = DAY(GETDATE())
    order by no_of_posts Desc 

    select jp.date_updated
    from rs_job_posting jp
END

else if @start_date = 'weekly'
begin
select jp.id, city.name[City]
    , row_number() over (order by city.name) [sr_no]
    , count(jp.id) over (partition by name) as no_of_posts 
    , COUNT(od.id) over (partition by name) as no_of_employers
    ,CONVERT(varchar(12), jp.posting_date, 103) [date_created]

    from rs_job_posting jp

    inner join rs_job_posting_location jpl on jpl.id = jp.id
    inner join rs_cor_city city on city.id = jpl.city_fk
    inner join rs_organization_detail od on od.id = jp.id

    where DAY(posting_date) = DAY(GETDATE())
    order by no_of_posts Desc 

    select jp.date_updated
    from rs_job_posting jp
end

else if @start_date = 'byweekly'
begin
select jp.id, city.name[City]
    , row_number() over (order by city.name) [sr_no]
    , count(jp.id) over (partition by name) as no_of_posts 
    , COUNT(od.id) over (partition by name) as no_of_employers
    ,CONVERT(varchar(12), jp.posting_date, 103) [date_created]

    from rs_job_posting jp

    inner join rs_job_posting_location jpl on jpl.id = jp.id
    inner join rs_cor_city city on city.id = jpl.city_fk
    inner join rs_organization_detail od on od.id = jp.id

    where DAY(posting_date) = DAY(GETDATE())
    order by no_of_posts Desc 

    select jp.date_updated
    from rs_job_posting jp
end

else if @start_date = 'monthly'
begin
select jp.id, city.name[City]
    , row_number() over (order by city.name) [sr_no]
    , count(jp.id) over (partition by name) as no_of_posts 
    , COUNT(od.id) over (partition by name) as no_of_employers
    ,CONVERT(varchar(12), jp.posting_date, 103) [date_created]

    from rs_job_posting jp

    inner join rs_job_posting_location jpl on jpl.id = jp.id
    inner join rs_cor_city city on city.id = jpl.city_fk
    inner join rs_organization_detail od on od.id = jp.id

    where DAY(posting_date) = DAY(GETDATE())
    order by no_of_posts Desc 

    select jp.date_updated
    from rs_job_posting jp
end

else if @start_date = 'yearly'
begin
select jp.id, city.name[City]
    , row_number() over (order by city.name) [sr_no]
    , count(jp.id) over (partition by name) as no_of_posts 
    , COUNT(od.id) over (partition by name) as no_of_employers
    ,CONVERT(varchar(12), jp.posting_date, 103) [date_created]

    from rs_job_posting jp

    inner join rs_job_posting_location jpl on jpl.id = jp.id
    inner join rs_cor_city city on city.id = jpl.city_fk
    inner join rs_organization_detail od on od.id = jp.id

    where DAY(posting_date) = DAY(GETDATE())
    order by no_of_posts Desc 

    select jp.date_updated
    from rs_job_posting jp
end

结束

Answer 1

当针对数据库运行 SQL 查询时，我通常会在查询分析器中遇到这种错误。在查询分析器中，它是一个正在被解释的字符串。

我在德国工作，欧洲的日期格式不同于美国的日期格式，这通常是 SQL Server 安装中的默认设置。问题是有时你没有注意到。

02-11-2013 是 11 月 2 日的德国日期。在美国格式中，它是 2 月 11 日。一切都很好，除了你会得到错误的保存日期。但是，如果您尝试保存 31-10-2013，则美国日期将被解释为它不理解的第 31 个月。

正如评论中提到的，问题出在您的 SP，而不是您发布的代码中。检查日期解析或 SQL 字符串构建和 .exec。

编辑：基于您的存储过程。

declare @startdate datetime
if @startdate = 'weekly'
begin
select 1
end

您不能将变量的类型设为 datetime，然后将其与 varchar 进行比较。引擎将尝试将“每周”转换为日期格式，并为您提供您所看到的错误。