Create DataTable Schema from SQL

Question

I want to use a dataadapter with a datatable to insert thousands of record into a 30-column sql table.

SqlDataAdapter adapter = new SqlDataAdapter();
DataTable table = new DataTable();
adapter.InsertCommand = new SqlCommand("INSERT INTO ...");
adapter.UpdateBatchSize = 1000;
DataRow r = null;
foreach(var entry in list) 
{
    r = table.NewRow();
    r["lastchange"] = entry.TryGet("LastChangeTime"); 
    // <- throws System.ArgumentException: Column does not belong to table
    ...
}

Is there any way to not manually define the schema of the datatable, but to read it from the table the insertions should take place in?

Answer 1

Define SelectCommand and apply Fill method to get data first. If you need only table schema just make the query which returns no rows.

SqlDataAdapter adapter = new SqlDataAdapter();
DataTable table = new DataTable();
adapter.SelectCommand = new SqlCommand("SELECT * FROM myTable WHERE 1=2");
adapter.Fill(table);

Answer 2

You can create/define dataset in your project and can use it in your subsequent operation wherever you need.

Have a look at below link showing how to add dataset to your project and add tables into it and also how to use data adapters with this dataset.

https://msdn.microsoft.com/en-us/library/04y282hb.aspx

https://msdn.microsoft.com/en-us/library/ms171919.aspx

https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/populating-a-dataset-from-a-dataadapter

I hope this will help you. :)