/// <summary>
/// Bulk Insert Entities in DB
/// </summary>
/// <typeparam name="DB">DB Context Type</typeparam>
/// <typeparam name="T">Entity Type</typeparam>
/// <param name="dbContext">DB Context</param>
/// <param name="entities">List of Entities</param>
/// <param name="identificator">
/// Expression which generate unique value for each entity. It can be one column or combination
/// of columns
/// </param>
/// <param name="configAction">Configure Bulk Insert Options</param>
/// <returns></returns>
public static async Task <int> BulkInsertAsync <DB, T>(this DB dbContext, IEnumerable <T> entities, Expression <Func <T, object> > identificator, Action <BulkInsertOptions <T> > configAction = null)
where DB : DbContext
where T : class
{
var enumerable = entities.ToList();
if (!enumerable.Any())
{
return(0);
}
var options = new BulkInsertOptions <T>();
configAction?.Invoke(options);
if (options.FireTriggers)
{
TriggersBulk <T, DB> .RaiseInserting(enumerable, dbContext);
}
var config = new MapperConfiguration(conf =>
{
conf.CreateMap <T, T>().MaxDepth(1).ForAllMembers(c =>
{
if ((c.DestinationMember as PropertyInfo)?.PropertyType.CustomAttributes.Any(x => x.AttributeType == typeof(NotMappedAttribute)) ?? false)
{
c.Ignore();
}
if ((c.DestinationMember as PropertyInfo)?.PropertyType.CustomAttributes.Any(x => x.AttributeType == typeof(ComplexTypeAttribute)) ?? false)
{
return;
}
if ((c.DestinationMember as PropertyInfo)?.PropertyType.IsSimple() ?? false)
{
return;
}
c.Ignore();
});
});
var mapper = config.CreateMapper();
var distEnts = enumerable.Distinct(new GenericCompare <T>(identificator)).ToList();
var ent = mapper.Map <List <T> >(distEnts);
var bulkInsert = new BulkOperations().Setup <T>()
.ForCollection(ent)
.WithTable(string.IsNullOrEmpty(options.TableName) ? dbContext.GetTableName <T>() : options.TableName)
.WithBulkCopySettings(new BulkCopySettings()
{
BatchSize = options.BatchSize, BulkCopyTimeout = options.Timeout, SqlBulkCopyOptions = options.SqlBulkCopyOptions
})
.AddAllColumns()
.DetectColumnWithCustomColumnName()
.RemoveNotMappedColumns()
.BulkInsert();
if (options.IdentityColumn != null)
{
bulkInsert = bulkInsert.SetIdentityColumn(options.IdentityColumn, ColumnDirectionType.Input);
}
var num = await bulkInsert.CommitAsync(dbContext.Database.Connection as SqlConnection);
if (options.FireTriggers)
{
TriggersBulk <T, DB> .RaiseInserted(enumerable, dbContext, identificator);
}
return(num);
}
