Database dataset from updating
Here's what happens: You add a database to some non-ASP. You run some code that makes some updates and everything seems to work with all of your updates accepted.You then do a second run…and it's like your previous run never happened!The Sql Data Adapter opens a connection only when required and closes it as soon as it has performed its task.For example, the Sql Data Adapter performs the following tasks when filling a Data Set with data: In between the Fill and Update operations, data source connections are closed and you are free to read and write data with the Data Set as you need.Data Sets only hold data and do not interact with a data source.It is the Sql Data Adapter that manages connections with the data source and gives us disconnected behavior.
But if you want one test run to build on the changes from a previous test run…well, you're out of luck.And sure enough, when you go to Server Explorer and browse to the rows that should have been changed in the first run you can see that the data is unchanged.That's because, when you press F5, Visual Studio quietly copies your database from your project's root folder to the bin/Debug folder, and that's the version of the database that your code updates.This is my code so far: Dim cn As New Sql Connection("Data Source=.\SQLEXPRESS; Attach Db Filename=|Data Directory|\Student ODPLog Book.mdf; Integrated Security=True; Connect Timeout=30; User Instance=True") Dim cmd As New Sql Command 'insert SQL command' cmd. Text) 'Open connection ,execute sql command and close connection' cn. Command Text = "Insert Into Operations Table (Operation Name, Operation Id) Values (@Operation Name,5)" 'Takes the text box data as the parameter to be stored in the dataset' cmd. Open() 'cmd Builder = New Sql Command Builder(Sql Data Adapter1) cmd.
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