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];
}

我有一个页面，可以按城市进行报告，现在我在其上添加了一个下拉列表，以按日期（即星期，今天，月份，年份等）过滤结果

一切正常，但是这段代码有问题，因为它给我一个错误“从字符串转换日期和/或时间时转换失败。”

PS这是我的存储过程

ALTER PROCEDURE [dbo]。[sp_admin_reports_city_filter_select]-在此处添加存储过程的参数-@ id INT = NULL @start_date DateTime，@end_date DateTime AS BEGIN-声明@startdate datetime set @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，它是一个正在解释的字符串。

我在德国工作，欧洲日期格式与美国日期格式不同，后者通常是SQL Server安装中的默认格式。 问题在于有时您不会注意到。

2013年2月11日是德国的11月2日。 以美国格式，它是2月11日。 除了您得到的日期错误之外，其他所有操作都没问题。 但是，如果您尝试保存2013年10月31日，则美国日期会被解释为它不理解的第31个月。

如评论中所述，问题出在您的SP中，而不是您发布的代码中。 检查日期解析或SQL字符串建立以及.exec。

编辑：基于您的存储过程。

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

您不能使用类型为datetime的变量，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，并为您显示错误。