将null传递为SQLParameter DateTime值 [英] Passing null as SQLParameter DateTime value

问题描述

我有以下查询:

INSERT INTO CWS_FORWARDING_PROFILE
           (TNR_COMPANY_PROFILE,BOL_FORWARD_MAIL,BOL_FORWARD_SMS,BOL_FORWARD_MESSAGES
           ,DT_MO_FROM1,DT_MO_FROM2,DT_MO_FROM3,DT_MO_TO1,DT_MO_TO2,DT_MO_TO3
           ,DT_TU_FROM1,DT_TU_FROM2,DT_TU_FROM3,DT_TU_TO1,DT_TU_TO2,DT_TU_TO3
           ,DT_WE_FROM1,DT_WE_FROM2,DT_WE_FROM3,DT_WE_TO1,DT_WE_TO2,DT_WE_TO3
           ,DT_TH_FROM1,DT_TH_FROM2,DT_TH_FROM3,DT_TH_TO1,DT_TH_TO2,DT_TH_TO3
           ,DT_FR_FROM1,DT_FR_FROM2,DT_FR_FROM3,DT_FR_TO1,DT_FR_TO2,DT_FR_TO3
           ,DT_SA_FROM1,DT_SA_FROM2,DT_SA_FROM3,DT_SA_TO1,DT_SA_TO2,DT_SA_TO3
           ,DT_SU_FROM1,DT_SU_FROM2,DT_SU_FROM3,DT_SU_TO1,DT_SU_TO2,DT_SU_TO3)

            VALUES(@tnrProfile, @forwardMail, @forwardSms, @forwardMessages,
                    @MoFrom1, @MoFrom2, @MoFrom3, @MoTo1, @MoTo2, @MoTo3,
                    @TuFrom1, @TuFrom2, @TuFrom3, @TuTo1, @TuTo2, @TuTo3,
                    @WeFrom1, @WeFrom2, @WeFrom3, @WeTo1, @WeTo2, @WeTo3,
                    @ThFrom1, @ThFrom2, @ThFrom3, @ThTo1, @ThTo2, @ThTo3,
                    @FrFrom1, @FrFrom2, @FrFrom3, @FrTo1, @FrTo2, @FrTo3,
                    @SaFrom1, @SaFrom2, @SaFrom3, @SaTo1, @SaTo2, @SaTo3,
                    @SuFrom1, @SuFrom2, @SuFrom3, @SuTo1, @SuTo2, @SuTo3);

我添加我的DateTime参数如下:

I add my DateTime parameters as follows:

SqlParameter moFrom1Param = new SqlParameter("@MoFrom1", dTOForwarding.MoFrom1);
            moFrom1Param.IsNullable = true;
            moFrom1Param.Direction = ParameterDirection.Input;
            moFrom1Param.SqlDbType = SqlDbType.DateTime;
            cmd.Parameters.Add(moFrom1Param);

当我执行此操作时，但仅将实际日期时间指定给某些参数，其余所有参数都为null.因此要清楚一点，从星期一到星期三的所有参数都具有日期时间值.其余的星期四到星期日没有.因此，这些将作为null传递.我收到这样的错误:

When I execute this, but only give an actual datetime to certain parameters and all the rest is null. So to be clear, all parameters from monday till wednesday have a datetime value. The rest thursday till sunday hasn't. So those are passed as null. I get an error like this:

The parameterized query '(@tnrProfile int,@forwardMail bit,@forwardSms bit,@forwardMessag' expects the parameter '@ThFrom1', which was not supplied.

我在这里找到了关于stackoverflow和google的一些答案，但是我发现的答案对我没有用..

I have looked for some answers here on stackoverflow and google, but the answers I've found never worked for me..

所以我的问题是，如果我的DateTime参数具有null作为值，那么如何确保该值被sql理解并实际上传递为null而不是告诉我未提供该参数.

So my question is, how can I make sure that if my DateTime parameter has null as value, that value is understood by sql and actually passed as null instead of telling me the parameter was not supplied.

希望这里有人可以帮助我.

Hope someone here can help me.

谢谢.

这是解决方案:

SqlParameter moFrom1Param = new SqlParameter("@MoFrom1", dTOForwarding.MoFrom1 == null ?
                (Object)DBNull.Value : dTOForwarding.MoFrom1);
            moFrom1Param.IsNullable = true;
            moFrom1Param.Direction = ParameterDirection.Input;
            moFrom1Param.SqlDbType = SqlDbType.DateTime;
            cmd.Parameters.Add(moFrom1Param);

推荐答案

SqlParameter moFrom1Param = new SqlParameter("@MoFrom1", dTOForwarding.MoFrom1 == null ? DBNull.Value : dTOForwarding.MoFrom1);
            moFrom1Param.IsNullable = true;
            moFrom1Param.Direction = ParameterDirection.Input;
            moFrom1Param.SqlDbType = SqlDbType.DateTime;
            cmd.Parameters.Add(moFrom1Param);

这篇关于将null传递为SQLParameter DateTime值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！