.Net Core how to implement SQLAdapter ./ DataTable function

Question

I have a simple .Net Framework routine which runs a query and returns a DataTable object. I need to port this to .Net Core, however I infer that SQLAdapter and DataTable ar

Answer 1

Instead of DataAdapter/DataTable you may use one of the existing DAL libraries for .NET Core that support CRUD operations over low-level ADO.NET interfaces. Recently I've published NReco.Data: provider-independent DAL that supports automatic SQL statements generation, abstract queries and simple record CRUD operations.

For example, code snippet from the question can be reimplemented in the following way:

var con = new SqlConnection(m_ConnectString);
var dbFactory = new NReco.Data.DbFactory(
    System.Data.SqlClient.SqlClientFactory.Instance);
var dbCmdBuilder = new NReco.Data.DbCommandBuilder(dbFactory);
var dbAdapter = new NReco.Data.DbDataAdapter(con, dbCmdBuilder);

var selectRecordsList = dbAdapter.Select( 
    new Query("some_table") ).ToList>();

Complex SQL queries may be executed as application-level data views:

dbCmdBuilder.Views["some_view"] = new DbDataView(
    @"SELECT @columns FROM Employee emp
      LEFT JOIN Company c ON (c.Id=emp.CompanyId)
      @where[ WHERE {0}] @orderby[ ORDER BY {0}]
    ") {
      FieldMapping = new Dictionary() {
        {"Id", "emp.Id"},
        {"*", "emp.*, c.Title as CompanyTitle"}
      }
    };
var someViewRS = dbAdapter.Select( new Query("some_view") ).ToRecordSet();

NReco.Data doesn't try to replace SQL with the its own Query (like LINQ does); instead of that it allows you to make simple DB-independent queries from business logic and encapsulate complex SQL syntax with special app-level dataviews that accessed like read-only tables.

Also it is possible to specify raw SQL query directly with Select method overload (like FromSql in EF Core):

var userModels = dbAdapter.Select("select * from users where id={0}", 5).ToList();