Question

我的表中有一些字段，格式化为四位小数（即0.0125）。

我在Visual Basic中使用NumericUpDown对象来收集我想要传递给我的数据库的数字。

不幸的是，当我运行我的代码时，我收到以下错误：

从字符串“（CallType，ChargeCode，Destinatio”到“Double”类型的转换无效。

以下是我用来将值推送到数据库的代码的副本。

Using cmdc = New SqlCommand("INSERT INTO " & TextBox2.Text
                             & " (CallType,
                                  ChargeCode,
                                  Destination,
                                  TariffUsed,
                                  (case when chargecode in ('" + Combobox2.text + "') then '" + NumericUpDown1.value + "'
                                  else Peak*2 end) as Peak,
                                  (case when chargecode in ('" + Combobox2.text + "') then '" + NumericUpDown2.value + "'
                                  else OffPeak*2 end) as OffPeak,
                                 (case when chargecode in ('" + Combobox2.text + "') then '" + NumericUpDown3.value + "'
                                 else Weekend*2 end) as Weekend,
                                 (case when chargecode in ('" + Combobox2.text + "') then '" + NumericUpDown4.value + "'
                                 else Setup*2 end) as Setup,
                                 (case when chargecode in ('" + Combobox2.text + "') then '" + NumericUpDown5.value + "'
                                 else MinimumCharge*2 end) as MinimumCharge,
                                 ChargeCap,
                                 InitialUnits,
                                 InitialCharge,
                                 InitialPeak,
                                 InitialOffPeak,
                                 InitialWeekend,
                                 BillingUnit,
                                 MinimumUnits,
                                 RateType
                          FROM " & ComboBox1.Text & "", con)

con.Open()
cmdc.ExecuteNonQuery()
con.Close()
End Using
End Using

由于SQL中不存在DOUBLE，因此我将目标字段配置为FLOAT。

是否可以将NumericUpDown中的值传递到我的数据库中，如果是这样，那么正确的格式是什么？

Answer 1

非常感谢@Paqogomez：

ToString（）解决了这个问题。

以下是工作代码：

Using cmdc = New SqlCommand("Insert into " & TextBox2.Text & " Select CallType,ChargeCode,Destination,TariffUsed,(case when chargecode in ('" + ComboBox2.Text + "') then " + NumericUpDown1.Value.ToString() + " else Peak*2 end) as Peak,(case when chargecode in ('" + ComboBox2.Text + "') then " + NumericUpDown2.Value.ToString() + " else OffPeak*2 end) as OffPeak,(case when chargecode in ('" + ComboBox2.Text + "') then " + NumericUpDown3.Value.ToString() + " else Weekend*2 end) as Weekend,(case when chargecode in ('" + ComboBox2.Text + "') then " + NumericUpDown4.Value.ToString() + " else Setup*2 end) as Setup,(case when chargecode in ('" + ComboBox2.Text + "') then " + NumericUpDown5.Value.ToString() + " else MinimumCharge*2 end) as MinimumCharge,ChargeCap,InitialUnits,InitialCharge,InitialPeak,InitialOffPeak,InitialWeekend,BillingUnit,MinimumUnits,RateType from Daisy_March2014", con)
con.Open()
cmdc.Parameters.AddWithValue("@tarrif2", TextBox2.Text)
cmdc.Parameters.AddWithValue("@DateTime", DateTime.Now())
cmdc.ExecuteNonQuery()
con.Close()
End Using
End Using

*使用风险自负，应该真正参数化！

将值从NumericUpDown控件传递到SQL数据库

1 个答案: