EFCore.BulkExtensions,EntityFramework-Plus 都是Microsoft推荐的EFcore扩展 。
可以通过nuget安装
一、EFCore.BulkExtensions
使用方法如下:
实体批量操作:
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(); context.TruncateAsync();
按条件批量操作
//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 { 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
当直接使用这些操作是独立的事务和自动提交。不需要手动savechange
然后如果我们需要多个操作单一过程应该使用显式事务。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();
}
}
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 });