EFcore 使用 EFCore.BulkExtensions（不支持mysql）或 EntityFramework-Plus 批量增加、刪除、修改

EFCore.BulkExtensions，EntityFramework-Plus  都是Microsoft推薦的EFcore擴展 。

可以通過nuget安裝

一、EFCore.BulkExtensions

使用方法如下：

實體批量操作：

context.BulkInsert(entitiesList);                 context.BulkInsertAsync(entitiesList);
context.BulkUpdate(entitiesList);                 context.BulkUpdateAsync(entitiesList);
context.BulkDelete(entitiesList);                 context.BulkDeleteAsync(entitiesList);
context.BulkInsertOrUpdate(entitiesList);         context.BulkInsertOrUpdateAsync(entitiesList);       //Upsert
context.BulkInsertOrUpdateOrDelete(entitiesList); context.BulkInsertOrUpdateOrDeleteAsync(entitiesList); //Sync
context.BulkRead(entitiesList);                   context.BulkReadAsync(entitiesList);
context.Truncate<Entity>();                       context.TruncateAsync<Entity>();

按條件批量操作

// Delete
context.Items.Where(a => a.ItemId >  500).BatchDelete();
context.Items.Where(a => a.ItemId >  500).BatchDeleteAsync();
// Update (using Expression arg.) supports Increment/Decrement 
context.Items.Where(a => a.ItemId <= 500).BatchUpdate(a => new Item { Quantity = a.Quantity + 100 });
  // can be as value '+100' or as variable '+incrementStep' (int incrementStep = 100;)
  
// Update (via simple object)
context.Items.Where(a => a.ItemId <= 500).BatchUpdate(new Item { Description = "Updated" });
context.Items.Where(a => a.ItemId <= 500).BatchUpdateAsync(new Item { Description = "Updated" });
// Update (via simple object) - requires additional Argument for setting to Property default value
var updateColumns = new List<string> { nameof(Item.Quantity) }; // Update 'Quantity' to default value('0'-zero)
var q = context.Items.Where(a => a.ItemId <= 500);
int affected = q.BatchUpdate(new Item { Description = "Updated" }, updateColumns);//result assigned to variable

當直接使用這些操作是獨立的事務和自動提交。不需要手動savechange
然後如果我們需要多個操作單一過程應該使用顯式事務。如下

using (var connection = (SqliteConnection)context.Database.GetDbConnection())
{
    connection.Open();
    using (var transaction = connection.BeginTransaction())
    {
        var bulkConfig = new BulkConfig() { SqliteConnection = connection, SqliteTransaction = transaction };
        context.BulkInsert(entities, bulkConfig);
        context.BulkInsert(subEntities, bulkConfig);
        transaction.Commit();
    }
}

插件源碼在 github 

二、EntityFramework-Plus

主要是mssql和mysql都支持

// using Z.EntityFramework.Plus; // Don't forget to include this.

// DELETE all users which has been inactive for 2 years
ctx.Users.Where(x => x.LastLoginDate < DateTime.Now.AddYears(-2))
         .Delete();

// DELETE using a BatchSize
ctx.Users.Where(x => x.LastLoginDate < DateTime.Now.AddYears(-2))
         .Delete(x => x.BatchSize = 1000);

// using Z.EntityFramework.Plus; // Don't forget to include this.

// UPDATE all users which has been inactive for 2 years
ctx.Users.Where(x => x.LastLoginDate < DateTime.Now.AddYears(-2))
         .Update(x => new User() { IsSoftDeleted = 1 });