Data is not inserting into table?

Question

My table name is Customer. It has four columns

CustomerId
CustomerName
CustomerAddress
PhoneNo

This is my c# code. I am not ge

Answer 1

Is CustomerId setup as an AutoIncrementing PK on the Customer table? Also, you do not need the single quote (') on the '@CustAdd' param;

Answer 2

What you say simply doesn't happen. Either the query will insert a record, or you will get an exception.

There is an error in your query, though. There shouldn't be apostrophes around the @CustAdd parameter, that will make the database interpret that as a literal string, not a parameter:

string query = "insert into Customer(CustomerName,CustomerAddress,PhoneNo) values (@CustNm,@CustAdd,@Ph)";

I'm not certain how the database would react, but you would either get an exception telling you that you have a parameter that is never used in the query, or it would insert a record with the value @CustAdd as the address.

Answer 3

You didnt specify the same paramets, (forgot to add "@" do it like:

string query = "insert into Customer(CustomerName,CustomerAddress,PhoneNo) values (@CustNm,'@CustAdd',@Ph)";
        SqlCommand myCommand = new SqlCommand(query,myConnection);
        myCommand.Parameters.AddWithValue("@CustNm",Print[0].CustomerName);
        myCommand.Parameters.AddWithValue("@CustAdd",Print[0].Address);
        myCommand.Parameters.AddWithValue("@Ph",Print[0].Telephone);

Answer 4

As I've said before on this site - the whole User Instance and AttachDbFileName= approach is flawed - at best! Visual Studio will be copying around the .mdf file and most likely, your INSERT works just fine - but you're just looking at the wrong .mdf file in the end!

If you want to stick with this approach, then try putting a breakpoint on the myConnection.Close() call - and then inspect the .mdf file with SQL Server Mgmt Studio Express - I'm almost certain your data is there.

The real solution in my opinion would be to

1. install SQL Server Express (and you've already done that anyway)

2. install SQL Server Management Studio Express

3. create your database in SSMS Express, give it a logical name (e.g. VictoryDatabase)

4. connect to it using its logical database name (given when you create it on the server) - and don't mess around with physical database files and user instances. In that case, your connection string would be something like:

   Data Source=.\\SQLEXPRESS;Database=VictoryDatabase;Integrated Security=True
   

   and everything else is exactly the same as before...

Answer 5

1. Are you sure you're looking at the right database to verify that no data is being inserted?
2. Are you performing this insert within the context of a transaction that isn't being committed?