Bulk inserts taking longer than expected using Dapper

Question

After reading this article I decided to take a closer look at the way I was using Dapper.

I ran this code on an empty database

var members = new List         


        

Answer 1

Using the Execute method with only one insert statement will never do a bulk insert or be efficient. Even the accepted answer with a Transaction doesn't do a Bulk Insert.

If you want to perform a Bulk Insert, use the SqlBulkCopy https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlbulkcopy

You will not find anything faster than this.

Dapper Plus

Disclaimer: I'm the owner of the project Dapper Plus

This project is not free but offers all bulk operations:

• BulkInsert
• BulkUpdate
• BulkDelete
• BulkMerge

(Use under the hood SqlBulkCopy)

And some more options such as outputting identity values:

// CONFIGURE & MAP entity
DapperPlusManager.Entity()
                 .Table("Orders")
                 .Identity(x => x.ID);

// CHAIN & SAVE entity
connection.BulkInsert(orders)
          .AlsoInsert(order => order.Items);
          .Include(x => x.ThenMerge(order => order.Invoice)
                         .AlsoMerge(invoice => invoice.Items))
          .AlsoMerge(x => x.ShippingAddress);   

Our library supports multiple providers:

• SQL Server
• SQL Compact
• Oracle
• MySql
• PostgreSQL
• SQLite
• Firebird