Using SqlBulkCopy with F# to export matrix in SQL

Question

I want to transfer a large amount of data from F# to an SQL table. Basically my F# code creates a matrix of three columns (UserID, ProductID and price) and N li

Answer 1

If you're okay with third party libraries, fastmember can be really useful here.

module DB =
    open System.Data
    open System.Data.SqlClient
    open FastMember

    // val bulk : conn:SqlConnection -> table:string -> columns:seq -> items:seq
    let bulk conn table columns items =        
        use bcp = new SqlBulkCopy(connection = conn)
        bcp.EnableStreaming <- true
        bcp.DestinationTableName <- table
        for n,v in columns do   
            bcp.ColumnMappings.Add(new SqlBulkCopyColumnMapping(sourceColumn = n, destinationColumn = v))               
            |> ignore
        bcp.WriteToServer(items |> ObjectReader.Create)

This leaves you with a generic method that you can just funnel any seq into. Along with some config parameters, which you can of course configure to your needs.