adamtrask
asked on
How to save code for data access in a central place
I am a novice C# programmer and need to learn where and how to store the data access code in a central place in a windows applications, developed using Visual Studio 2012.
I know that in ASP.Net I use the configuration file to place and access reference to the code. But how does this apply to a C# Windows application?
What I have been doing for a long time is to write almost the same code or almost the same code for data access over and over:
Something like the method below with little variations (it could be "void" instead of data type):
public DataTable GetMyData()
{
SqlConnection con;
con = new SqlConnection("Server=mySe
SqlCommand comm = new SqlCommand("Select id,Name from myTable order by LastName", con);
SqlDataAdapter dataAdapter1 = new SqlDataAdapter(comm);
DataSet ds1 = new DataSet();
dataAdapter1.Fill(ds1, "tableNamef");
return ds1.Tables["tablwNamw"];
}
Please give example if possible.
Thanks
Adam
I know that in ASP.Net I use the configuration file to place and access reference to the code. But how does this apply to a C# Windows application?
What I have been doing for a long time is to write almost the same code or almost the same code for data access over and over:
Something like the method below with little variations (it could be "void" instead of data type):
public DataTable GetMyData()
{
SqlConnection con;
con = new SqlConnection("Server=mySe
SqlCommand comm = new SqlCommand("Select id,Name from myTable order by LastName", con);
SqlDataAdapter dataAdapter1 = new SqlDataAdapter(comm);
DataSet ds1 = new DataSet();
dataAdapter1.Fill(ds1, "tableNamef");
return ds1.Tables["tablwNamw"];
}
Please give example if possible.
Thanks
Adam
You can have it in the Busines Logic layer, or a generic function that'll take the sql as string parameter. And reuse the connection object as much as possible. What is the purpose you are trying to solve here exactly?
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Connectonstrings should e stored in config file or in strings in the Resources. Check it out.
ASKER
Thank you both...
Yes, the main purpose is to avoid hard coding the code. I used it when I was experimenting with ASP.Net and learned to store the connection in a configuration file which was automatically created in each project. It looks like I need to learn to create one myself in C#.
I intend to use the example referred by expert Anarki but I need to check if i can use SqlServer instead of MS.Access. This is the plan for the weekend and I will see if I can figure it out.
P.S. Thank your for the try-catch remark anarki_jimbel. Yes, I will use it.
Yes, the main purpose is to avoid hard coding the code. I used it when I was experimenting with ASP.Net and learned to store the connection in a configuration file which was automatically created in each project. It looks like I need to learn to create one myself in C#.
I intend to use the example referred by expert Anarki but I need to check if i can use SqlServer instead of MS.Access. This is the plan for the weekend and I will see if I can figure it out.
P.S. Thank your for the try-catch remark anarki_jimbel. Yes, I will use it.
ASKER
Thank you
http://msdn.microsoft.com/en-us/library/ms243192.aspx
In some cases I just create a custom xml file with required entries and read it. Depends on a task.