从数据库获取数据

Question

I'm using visual web developer C#, I set the storeid to default value of 100 from Sql Server. I then set the column storeid to visible false cause I want to automatically insert 100 without showing on my form. But every time I try inserting a new record from my form it only shows null in the database storeid column.

This is the storeid datagridview column code:

<asp:BoundField DataField="StoreID" HeaderText="Store ID" 
SortExpression="StoreID" ConvertEmptyStringToNull="False" ReadOnly="True" Visible="False">

This is the storeid details view code:

<asp:BoundField DataField="StoreID" HeaderText="Store ID" 
 SortExpression="StoreID" ConvertEmptyStringToNull="False" ReadOnly="Visible="False">

This is my storeid column database:

ALTER TABLE [dbo].[StaffCCD] ADD  CONSTRAINT [DF_StaffCCD_StoreID]  DEFAULT ((100)) FOR [StoreID]

Answer 1

I suspect what is happening is even though the column is hidden, a value of 'Null' for StoreID is still being passed in the Insert. A default constraint will only work when no other value is supplied for the column.

I'd test the default value is correctly configured by running an insert statement (without setting Store ID) in SQL Management Studio and checking that Store ID is in fact defaulting correctly to 100.