Question

i have a problem in inserting some data into a table.

I have done a program with a simple DB.
I use

• c#
• framework 3.5
• sql server mobile
• The program run on a GPRS device. Every day it receive a zip file,
  extract it and insert the rows into
  some tables.

Some quotes

Open the connection :

SqlCeConnection conn = new SqlCeConnection("DataSource = " + file);
conn.Open();                

Write a row :

String sql = "INSERT INTO Mercati(id,descr) VALUES(643,'SHAMPOO')"
SqlCeCommand execute = conn.CreateCommand();
execute.CommandText = sql;
int result = execute.ExecuteNonQuery();
execute.Dispose();

The data table is like that :

CREATE TABLE Mercati(id int PRIMARY KEY,descr nvarchar(40));

This is inside a try / catch. And every time result is 1 ( i cutted away debugging code ).
I repeat that on different tables, with different data.

But SOMETIMES (1 time avery 4/5 transmissions) with one table the data are not inserted, with result=1 and no exceptions.

• Every time I transmit i reset the
  device and my program it’s restarted.
• The tables are emptied every time
  (DELETE FROM Mercati)
• The data are
  every times the same (those are the
  base for a work, but they could
  change sometimes a months)

I’m really out of ideas. I cant understand what’s the problem. Or simply how can i resolve that issue.
Any solution or advise ?

Thanks a lot
Daniele

Answer 1

I have resolved.

After INSERTs i do some backups, then i reset the device.
BUT i didn’t close the DB.

The strange is that i did the advice of SeaDrive, and after my insertions the table contains the exact number of rows.
I did 9 INSERT and my select return 9 Rows.After reset i have only 1 row.

I think there is some sort of cache, that is transparent during execution, but leave the fisical file unchanged, unless the DB it’s closed.

I hope that will help other poor developper like me to close their DB 😀