Dapper Plus Then Bulk Update

Description

The Dapper Plus ThenBulkUpdate method allows to UPDATE entities in a database table or a view using a lambda expression.

The lambda expression uses the entity or the IEnumerable from the last Bulk[Action] or ThenBulk[Action] chained method. (The action can be an insert, update, delete or merge operation).

Then Bulk Update Async

To implement chaining with the ThenBulkUpdateAsync method, start with an asynchronous operation and follow it up with this method.

You must use an await for every database operation you perform asynchronously.

In this C# example, we show how to update a list of orders and their associated invoices in our database asynchronously:

await (await connection.BulkUpdateAsync(orders)).ThenBulkUpdateAsync(order => order.Invoice);

Then Bulk Update with "One to One" Relation

The Dapper Plus ThenBulkUpdate method allows updating a related item with a "One to One" relation.

//Update an order and then the related invoice.
connection.BulkUpdate(orderTransaction)
          .ThenBulkUpdate(transaction => transaction.order)
          .ThenBulkUpdate(order => order.Invoice);

//Update a list of orders and then the related invoice to every order.
connection.BulkUpdate(orderTransaction)
          .ThenBulkUpdate(transaction => transaction.orders)
          .ThenBulkUpdate(order => order.Invoice);

Then Bulk Update with "One to Many" Relation

The Dapper Plus ThenBulkUpdate method allows updating related items with a "One to Many" relation.

//Update an order and then all related items.
connection.BulkUpdate(orderTransaction)
          .ThenBulkUpdate(transaction => transaction.order)
          .ThenBulkUpdate(order => order.Items);

//Update a list of orders and then all related items to every order.
connection.BulkUpdate(orderTransaction)
          .ThenBulkUpdate(transaction => transaction.orders);
          .ThenBulkUpdate(order => order.Items);

Then Bulk Update Chaining

The Dapper Plus ThenBulkUpdate method allows chaining multiple bulk action methods.

//Update an order and then all related items. Update an invoice and then all related items.
connection.BulkUpdate(orderTransaction)
          .ThenBulkUpdate(transaction => transaction.order)
          .ThenBulkUpdate(order => order.Items)
          .BulkUpdate(invoiceTransaction)
          .ThenBulkUpdate(transaction => transaction.invoice)
          .ThenBulkUpdate(invoice => invoice.Items);

//Update a list of orders and then all related items to every order. Update a list of invoices 
//and then all related items to every invoice.
connection.BulkUpdate(orderTransaction)
          .ThenBulkUpdate(transaction => transaction.orders)
          .ThenBulkUpdate(order => order.Items)
          .BulkUpdate(invoiceTransaction)
          .ThenBulkUpdate(transaction => transaction.invoices)
          .ThenBulkUpdate(invoice => invoice.Items);
Last updated: 2024-04-24
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