private void InsertWithDbComputedColumnsAndOutput()
{
using (var context = new TestContext(ContextUtil.GetOptions()))
{
context.BulkDelete(context.Documents.ToList());
var entities = new List <Document>();
for (int i = 0; i < EntitiesNumber; i++)
{
entities.Add(new Document
{
Content = "Some data " + i,
});
}
//context.BulkInsert(entities, new BulkConfig { SetOutputIdentity = true });
context.BulkInsert(entities, bulkAction => bulkAction.SetOutputIdentity = true); // example of setting BulkConfig with Action argument
}
using (var context = new TestContext(ContextUtil.GetOptions()))
{
var entities = context.Documents.ToList();
Assert.Equal(EntitiesNumber, entities.Count());
}
}
private void RunInsert(bool isBulkOperation)
{
using (var context = new TestContext(GetOptions()))
{
var entities = new List <Item>();
var subEntities = new List <ItemHistory>();
for (int i = 1; i < EntitiesNumber; i++)
{
var entity = new Item
{
ItemId = isBulkOperation ? i : 0,
Name = "name " + i,
Description = "info " + Guid.NewGuid().ToString().Substring(0, 3),
Quantity = i % 10,
Price = i / (i % 5 + 1),
TimeUpdated = DateTime.Now,
ItemHistories = new List <ItemHistory>()
};
var subEntity1 = new ItemHistory
{
ItemHistoryId = SeqGuid.Create(),
Remark = $"some more info {i}.1"
};
var subEntity2 = new ItemHistory
{
ItemHistoryId = SeqGuid.Create(),
Remark = $"some more info {i}.2"
};
entity.ItemHistories.Add(subEntity1);
entity.ItemHistories.Add(subEntity2);
entities.Add(entity);
}
if (isBulkOperation)
{
using (var transaction = context.Database.BeginTransaction())
{
context.BulkInsert(
entities,
new BulkConfig
{
PreserveInsertOrder = true,
SetOutputIdentity = true,
BatchSize = 4000,
UseTempDB = true,
UnderlyingConnection = GetUnderlyingConnection,
UnderlyingTransaction = GetUnderlyingTransaction
}
);
foreach (var entity in entities)
{
foreach (var subEntity in entity.ItemHistories)
{
subEntity.ItemId = entity.ItemId; // setting FK to match its linked PK that was generated in DB
}
subEntities.AddRange(entity.ItemHistories);
}
context.BulkInsert(subEntities, new BulkConfig()
{
UnderlyingConnection = GetUnderlyingConnection, UnderlyingTransaction = GetUnderlyingTransaction
});
transaction.Commit();
}
}
else
{
context.Items.AddRange(entities);
context.SaveChanges();
}
}
using (var context = new TestContext(GetOptions()))
{
int entitiesCount = ItemsCountQuery(context);
Item lastEntity = LastItemQuery(context);
Assert.Equal(EntitiesNumber - 1, entitiesCount);
Assert.NotNull(lastEntity);
Assert.Equal("name " + (EntitiesNumber - 1), lastEntity.Name);
}
}
private void RunInsert(bool isBulkOperation)
{
using (var context = new TestContext(ContextUtil.GetOptions()))
{
var entities = new List <Item>();
var subEntities = new List <ItemHistory>();
for (int i = 1, j = -(EntitiesNumber - 1); i < EntitiesNumber; i++, j++)
{
var entity = new Item
{
ItemId = isBulkOperation ? j : 0,
Name = "name " + i,
Description = "info " + Guid.NewGuid().ToString().Substring(0, 3),
Quantity = i % 10,
Price = i / (i % 5 + 1),
TimeUpdated = DateTime.Now,
ItemHistories = new List <ItemHistory>()
};
var subEntity1 = new ItemHistory
{
ItemHistoryId = SeqGuid.Create(),
Remark = $"some more info {i}.1"
};
var subEntity2 = new ItemHistory
{
ItemHistoryId = SeqGuid.Create(),
Remark = $"some more info {i}.2"
};
entity.ItemHistories.Add(subEntity1);
entity.ItemHistories.Add(subEntity2);
entities.Add(entity);
}
if (isBulkOperation)
{
if (ContextUtil.DbServer == DbServer.SqlServer)
{
using (var transaction = context.Database.BeginTransaction())
{
context.BulkInsert(
entities,
new BulkConfig
{
PreserveInsertOrder = true,
SetOutputIdentity = true,
BatchSize = 4000,
UseTempDB = true
},
(a) => WriteProgress(a)
);
foreach (var entity in entities)
{
foreach (var subEntity in entity.ItemHistories)
{
subEntity.ItemId = entity.ItemId; // setting FK to match its linked PK that was generated in DB
}
subEntities.AddRange(entity.ItemHistories);
}
context.BulkInsert(subEntities);
transaction.Commit();
}
}
else if (ContextUtil.DbServer == DbServer.Sqlite)
{
using (var connection = (SqliteConnection)context.Database.GetDbConnection())
{
connection.Open();
using (var transaction = connection.BeginTransaction())
{
var bulkConfig = new BulkConfig()
{
SqliteConnection = connection,
SqliteTransaction = transaction,
SetOutputIdentity = true,
};
context.BulkInsert(entities, bulkConfig);
foreach (var entity in entities)
{
foreach (var subEntity in entity.ItemHistories)
{
subEntity.ItemId = entity.ItemId; // setting FK to match its linked PK that was generated in DB
}
subEntities.AddRange(entity.ItemHistories);
}
bulkConfig.SetOutputIdentity = false;
context.BulkInsert(subEntities, bulkConfig);
transaction.Commit();
}
}
}
}
else
{
context.Items.AddRange(entities);
context.SaveChanges();
}
}
using (var context = new TestContext(ContextUtil.GetOptions()))
{
var temp = context.ItemHistories.FirstOrDefault();
int entitiesCount = ItemsCountQuery(context);
Item lastEntity = LastItemQuery(context);
Assert.Equal(EntitiesNumber - 1, entitiesCount);
Assert.NotNull(lastEntity);
Assert.Equal("name " + (EntitiesNumber - 1), lastEntity.Name);
}
}
private void TablePerTypeInsertTest()
{
ContextUtil.DbServer = DbServer.SQLServer;
using var context = new TestContext(ContextUtil.GetOptions());
context.LogPersonReports.Add(new LogPersonReport {
}); // used for initial add so that after RESEED it starts from 1, not 0
context.SaveChanges();
context.Truncate <LogPersonReport>();
context.Database.ExecuteSqlRaw($"DELETE FROM {nameof(Log)}");
context.Database.ExecuteSqlRaw($"DBCC CHECKIDENT('{nameof(Log)}', RESEED, 0);");
int nextLogId = GetLastRowId(context, tableName: nameof(Log));
int numberOfNewToInsert = 1000;
var entities = new List <LogPersonReport>();
for (int i = 1; i <= numberOfNewToInsert; i++)
{
nextLogId++; // OPTION 1.
var entity = new LogPersonReport
{
LogId = nextLogId, // OPTION 1.
PersonId = (i % 22),
RegBy = 15,
CreatedDate = DateTime.Now,
ReportId = (i % 22) * 10,
LogPersonReportTypeId = 4,
};
entities.Add(entity);
}
var bulkConfigBase = new BulkConfig
{
SqlBulkCopyOptions = Microsoft.Data.SqlClient.SqlBulkCopyOptions.KeepIdentity, // OPTION 1. - to ensure insert order is kept the same since SqlBulkCopy does not guarantee it.
PropertiesToInclude = new List <string>
{
nameof(LogPersonReport.LogId),
nameof(LogPersonReport.PersonId),
nameof(LogPersonReport.RegBy),
nameof(LogPersonReport.CreatedDate)
}
};
var bulkConfig = new BulkConfig
{
PropertiesToInclude = new List <string> {
nameof(LogPersonReport.LogId),
nameof(LogPersonReport.ReportId),
nameof(LogPersonReport.LogPersonReportTypeId)
}
};
context.BulkInsert(entities, bulkConfigBase, type: typeof(Log)); // to base 'Log' table
//foreach(var entity in entities) { // OPTION 2. Could be set here if Id of base table Log was set by Db (when Op.2. used 'Option 1.' have to be commented out)
// entity.LogId = ++nextLogId;
//}
context.BulkInsert(entities, bulkConfig); // to 'LogPersonReport' table
Assert.Equal(nextLogId, context.LogPersonReports.OrderByDescending(a => a.LogId).FirstOrDefault().LogId);
}
//[InlineData(DbServer.Sqlite)] Not supported
private void ShadowFKPropertiesTest(DbServer dbServer) // with Foreign Key as Shadow Property
{
ContextUtil.DbServer = dbServer;
using var context = new TestContext(ContextUtil.GetOptions());
if (dbServer == DbServer.SQLServer)
{
context.Truncate <ItemLink>();
context.Database.ExecuteSqlRaw("TRUNCATE TABLE [" + nameof(ItemLink) + "]");
}
else
{
//context.ChangeLogs.BatchDelete(); // TODO
context.BulkDelete(context.ItemLinks.ToList());
}
//context.BulkDelete(context.Items.ToList()); // On table with FK Truncate does not work
if (context.Items.Count() == 0)
{
for (int i = 1; i <= 10; ++i)
{
var entity = new Item
{
ItemId = 0,
Name = "name " + i,
Description = "info " + Guid.NewGuid().ToString().Substring(0, 3),
Quantity = i % 10,
Price = i / (i % 5 + 1),
TimeUpdated = DateTime.Now,
ItemHistories = new List <ItemHistory>()
};
context.Items.Add(entity);
}
context.SaveChanges();
}
var items = context.Items.ToList();
var entities = new List <ItemLink>();
for (int i = 0; i < EntitiesNumber; i++)
{
entities.Add(new ItemLink
{
ItemLinkId = 0,
Item = items[i % items.Count]
});
}
context.BulkInsert(entities);
if (dbServer == DbServer.SQLServer)
{
List <ItemLink> links = context.ItemLinks.ToList();
Assert.True(links.Count() > 0, "ItemLink row count");
foreach (var link in links)
{
Assert.NotNull(link.Item);
}
}
context.Truncate <ItemLink>();
}
private void OwnedTypesTest(DbServer dbServer)
{
ContextUtil.DbServer = dbServer;
using var context = new TestContext(ContextUtil.GetOptions());
if (dbServer == DbServer.SQLServer)
{
context.Truncate <ChangeLog>();
context.Database.ExecuteSqlRaw("TRUNCATE TABLE [" + nameof(ChangeLog) + "]");
}
else
{
//context.ChangeLogs.BatchDelete(); // TODO
context.BulkDelete(context.ChangeLogs.ToList());
}
var entities = new List <ChangeLog>();
for (int i = 1; i <= EntitiesNumber; i++)
{
entities.Add(new ChangeLog
{
Description = "Dsc " + i,
Audit = new Audit
{
ChangedBy = "User" + 1,
ChangedTime = DateTime.Now,
InfoType = InfoType.InfoTypeA
},
AuditExtended = new AuditExtended
{
CreatedBy = "UserS" + 1,
Remark = "test",
CreatedTime = DateTime.Now
},
AuditExtendedSecond = new AuditExtended
{
CreatedBy = "UserS" + 1,
Remark = "sec",
CreatedTime = DateTime.Now
}
});
}
context.BulkInsert(entities);
if (dbServer == DbServer.SQLServer)
{
context.BulkRead(
entities,
new BulkConfig
{
UpdateByProperties = new List <string> {
nameof(Item.Description)
}
}
);
Assert.Equal(2, entities[1].ChangeLogId);
}
// TEST
entities[0].Description += " UPD";
entities[0].Audit.InfoType = InfoType.InfoTypeB;
context.BulkUpdate(entities);
if (dbServer == DbServer.SQLServer)
{
context.BulkRead(entities);
}
Assert.Equal("Dsc 1 UPD", entities[0].Description);
Assert.Equal(InfoType.InfoTypeB, entities[0].Audit.InfoType);
}
//[InlineData(DbServer.Sqlite)] // No TimeStamp column type but can be set with DefaultValueSql: "CURRENT_TIMESTAMP" as it is in OnModelCreating() method.
private void TimeStampTest(DbServer dbServer)
{
ContextUtil.DbServer = dbServer;
using var context = new TestContext(ContextUtil.GetOptions());
context.Truncate <File>();
var entities = new List <File>();
for (int i = 1; i <= EntitiesNumber; i++)
{
var entity = new File
{
Description = "Some data " + i
};
entities.Add(entity);
}
context.BulkInsert(entities, bulkAction => bulkAction.SetOutputIdentity = true); // example of setting BulkConfig with Action argument
// Test BulkRead
var entitiesRead = new List <File>
{
new File {
Description = "Some data 1"
},
new File {
Description = "Some data 2"
}
};
context.BulkRead(entitiesRead, new BulkConfig
{
UpdateByProperties = new List <string> {
nameof(File.Description)
}
});
Assert.Equal(1, entitiesRead.First().FileId);
Assert.NotNull(entitiesRead.First().VersionChange);
// For testing concurrency conflict (UPDATE changes RowVersion which is TimeStamp column)
context.Database.ExecuteSqlRaw("UPDATE dbo.[File] SET Description = 'Some data 1 PRE CHANGE' WHERE [Id] = 1;");
var entitiesToUpdate = entities.Take(10).ToList();
foreach (var entityToUpdate in entitiesToUpdate)
{
entityToUpdate.Description += " UPDATED";
}
using var transaction = context.Database.BeginTransaction();
var bulkConfig = new BulkConfig {
SetOutputIdentity = true, DoNotUpdateIfTimeStampChanged = true
};
context.BulkUpdate(entitiesToUpdate, bulkConfig);
var list = bulkConfig.TimeStampInfo?.EntitiesOutput.Cast <File>().ToList();
Assert.Equal(9, list.Count());
Assert.Equal(1, bulkConfig.TimeStampInfo.NumberOfSkippedForUpdate);
if (bulkConfig.TimeStampInfo?.NumberOfSkippedForUpdate > 0)
{
//Options, based on needs:
// 1. rollback entire Update
transaction.Rollback(); // 1. rollback entire Update
// 2. throw Exception
//throw new DbUpdateConcurrencyException()
// 3. Update them again
// 4. Skip them and leave it unchanged
}
else
{
transaction.Commit();
}
}
private void RunInsert(bool isBulkOperation, bool insertTo2Tables = false)
{
using (var context = new TestContext(ContextUtil.GetOptions()))
{
var entities = new List <Item>();
var subEntities = new List <ItemHistory>();
for (int i = 1; i < entitiesNumber; i++)
{
entities.Add(new Item
{
ItemId = isBulkOperation ? i : 0,
Name = "name " + i,
Description = "info " + Guid.NewGuid().ToString().Substring(0, 3),
Quantity = i % 10,
Price = i / (i % 5 + 1),
TimeUpdated = DateTime.Now
});
}
if (insertTo2Tables)
{
foreach (var entity in entities)
{
subEntities.Add(new ItemHistory
{
ItemHistoryId = SeqGuid.Create(),
ItemId = entity.ItemId,
Remark = "some more info"
});
}
}
if (isBulkOperation)
{
if (!insertTo2Tables)
{
context.BulkInsert(entities);
}
else
{
using (var transaction = context.Database.BeginTransaction())
{
context.BulkInsert(entities, new BulkConfig {
PreserveInsertOrder = true, SetOutputIdentity = true, BatchSize = 4000
}, (a) => WriteProgress(a));
context.BulkInsert(subEntities);
transaction.Commit();
}
}
}
else
{
context.Items.AddRange(entities);
if (insertTo2Tables)
{
context.ItemHistories.AddRange(subEntities);
}
context.SaveChanges();
}
}
using (var context = new TestContext(ContextUtil.GetOptions()))
{
int entitiesCount = context.Items.Count();
Item lastEntity = context.Items.LastOrDefault();
Assert.Equal(entitiesNumber - 1, entitiesCount);
Assert.NotNull(lastEntity);
Assert.Equal("name " + (entitiesNumber - 1), lastEntity.Name);
}
}
private void RunInsert(bool isBulk)
{
using var context = new TestContext(ContextUtil.GetOptions());
var entities = new List <Item>();
var subEntities = new List <ItemHistory>();
for (int i = 1, j = -(EntitiesNumber - 1); i < EntitiesNumber; i++, j++)
{
var entity = new Item
{
ItemId = 0, //isBulk ? j : 0, // no longer used since order(Identity temporary filled with negative values from -N to -1) is set automaticaly with default config PreserveInsertOrder=TRUE
Name = "name " + i,
Description = "info " + Guid.NewGuid().ToString().Substring(0, 3),
Quantity = i % 10,
Price = i / (i % 5 + 1),
TimeUpdated = DateTime.Now,
ItemHistories = new List <ItemHistory>()
};
var subEntity1 = new ItemHistory
{
ItemHistoryId = SeqGuid.Create(),
Remark = $"some more info {i}.1"
};
var subEntity2 = new ItemHistory
{
ItemHistoryId = SeqGuid.Create(),
Remark = $"some more info {i}.2"
};
entity.ItemHistories.Add(subEntity1);
entity.ItemHistories.Add(subEntity2);
entities.Add(entity);
}
if (isBulk)
{
if (ContextUtil.DbServer == DbServer.SqlServer)
{
using var transaction = context.Database.BeginTransaction();
var bulkConfig = new BulkConfig
{
//PreserveInsertOrder = true, // true is default
SetOutputIdentity = true,
BatchSize = 4000,
UseTempDB = true,
CalculateStats = true
};
context.BulkInsert(entities, bulkConfig, (a) => WriteProgress(a));
Assert.Equal(EntitiesNumber - 1, bulkConfig.StatsInfo.StatsNumberInserted);
Assert.Equal(0, bulkConfig.StatsInfo.StatsNumberUpdated);
Assert.Equal(0, bulkConfig.StatsInfo.StatsNumberDeleted);
foreach (var entity in entities)
{
foreach (var subEntity in entity.ItemHistories)
{
subEntity.ItemId = entity.ItemId; // setting FK to match its linked PK that was generated in DB
}
subEntities.AddRange(entity.ItemHistories);
}
context.BulkInsert(subEntities);
transaction.Commit();
}
else if (ContextUtil.DbServer == DbServer.Sqlite)
{
using var transaction = context.Database.BeginTransaction();
var bulkConfig = new BulkConfig()
{
SetOutputIdentity = true
};
context.BulkInsert(entities, bulkConfig);
foreach (var entity in entities)
{
foreach (var subEntity in entity.ItemHistories)
{
subEntity.ItemId = entity.ItemId; // setting FK to match its linked PK that was generated in DB
}
subEntities.AddRange(entity.ItemHistories);
}
bulkConfig.SetOutputIdentity = false;
context.BulkInsert(subEntities, bulkConfig);
transaction.Commit();
}
}
else
{
context.Items.AddRange(entities);
context.SaveChanges();
}
// TEST
int entitiesCount = ItemsCountQuery(context);
Item lastEntity = context.Items.OrderByDescending(a => a.ItemId).FirstOrDefault();
Assert.Equal(EntitiesNumber - 1, entitiesCount);
Assert.NotNull(lastEntity);
Assert.Equal("name " + (EntitiesNumber - 1), lastEntity.Name);
}
public void InsertTestPostgreSql(DbServer dbServer, bool isBulk)
{
ContextUtil.DbServer = dbServer;
using var context = new TestContext(ContextUtil.GetOptions());
context.Database.ExecuteSqlRaw($@"DELETE FROM ""{nameof(Item)}""");
context.Database.ExecuteSqlRaw($@"ALTER SEQUENCE ""{nameof(Item)}_{nameof(Item.ItemId)}_seq"" RESTART WITH 1");
context.Database.ExecuteSqlRaw($@"DELETE FROM ""{nameof(Box)}""");
context.Database.ExecuteSqlRaw($@"ALTER SEQUENCE ""{nameof(Box)}_{nameof(Box.BoxId)}_seq"" RESTART WITH 1");
context.Database.ExecuteSqlRaw($@"DELETE FROM ""{nameof(UserRole)}""");
var currentTime = DateTime.UtcNow; // default DateTime type: "timestamp with time zone"; DateTime.Now goes with: "timestamp without time zone"
var entities = new List <Item>();
for (int i = 1; i <= 2; i++)
{
var entity = new Item
{
//ItemId = i,
Name = "Name " + i,
Description = "info " + i,
Quantity = i,
Price = 0.1m * i,
TimeUpdated = currentTime,
};
entities.Add(entity);
}
var entities2 = new List <Item>();
for (int i = 2; i <= 3; i++)
{
var entity = new Item
{
ItemId = i,
Name = "Name " + i,
Description = "UPDATE " + i,
Quantity = i,
Price = 0.1m * i,
TimeUpdated = currentTime,
};
entities2.Add(entity);
}
var entities3 = new List <Item>();
for (int i = 3; i <= 4; i++)
{
var entity = new Item
{
//ItemId = i,
Name = "Name " + i,
Description = "CHANGE " + i,
Quantity = i,
Price = 0.1m * i,
TimeUpdated = currentTime,
};
entities3.Add(entity);
}
var entities56 = new List <Item>();
for (int i = 5; i <= 6; i++)
{
var entity = new Item
{
//ItemId = i,
Name = "Name " + i,
Description = "CHANGE " + i,
Quantity = i,
Price = 0.1m * i,
TimeUpdated = currentTime,
};
entities56.Add(entity);
}
// INSERT
context.BulkInsert(entities);
Assert.Equal("info 1", context.Items.Where(a => a.Name == "Name 1").AsNoTracking().FirstOrDefault().Description);
Assert.Equal("info 2", context.Items.Where(a => a.Name == "Name 2").AsNoTracking().FirstOrDefault().Description);
// UPDATE
context.BulkInsertOrUpdate(entities2, new BulkConfig()
{
NotifyAfter = 1
}, (a) => WriteProgress(a));
Assert.Equal("UPDATE 2", context.Items.Where(a => a.Name == "Name 2").AsNoTracking().FirstOrDefault().Description);
Assert.Equal("UPDATE 3", context.Items.Where(a => a.Name == "Name 3").AsNoTracking().FirstOrDefault().Description);
var configUpdateBy = new BulkConfig {
UpdateByProperties = new List <string> {
nameof(Item.Name)
}
};
configUpdateBy.SetOutputIdentity = true;
context.BulkUpdate(entities3, configUpdateBy);
Assert.Equal(3, entities3[0].ItemId); // to test Output
Assert.Equal(4, entities3[1].ItemId);
Assert.Equal("CHANGE 3", context.Items.Where(a => a.Name == "Name 3").AsNoTracking().FirstOrDefault().Description);
Assert.Equal("CHANGE 4", context.Items.Where(a => a.Name == "Name 4").AsNoTracking().FirstOrDefault().Description);
// Test Multiple KEYS
var userRoles = new List <UserRole> {
new UserRole {
Description = "Info"
}
};
context.BulkInsertOrUpdate(userRoles);
// DELETE
context.BulkDelete(new List <Item>()
{
entities2[1]
}, configUpdateBy);
// READ
var secondEntity = new List <Item>()
{
new Item {
Name = entities[1].Name
}
};
context.BulkRead(secondEntity, configUpdateBy);
Assert.Equal(2, secondEntity.FirstOrDefault().ItemId);
Assert.Equal("UPDATE 2", secondEntity.FirstOrDefault().Description);
// SAVE CHANGES
context.AddRange(entities56);
context.BulkSaveChanges();
Assert.Equal(5, entities56[0].ItemId);
// BATCH
var query = context.Items.AsQueryable().Where(a => a.ItemId <= 1);
query.BatchUpdate(new Item {
Description = "UPDATE N", Price = 1.5m
} /*, updateColumns*/);
var queryJoin = context.ItemHistories.Where(p => p.Item.Description == "UPDATE 2");
queryJoin.BatchUpdate(new ItemHistory {
Remark = "Rx",
});
var query2 = context.Items.AsQueryable().Where(a => a.ItemId > 1 && a.ItemId < 3);
query.BatchDelete();
var descriptionsToDelete = new List <string> {
"info"
};
var query3 = context.Items.Where(a => descriptionsToDelete.Contains(a.Description));
query3.BatchDelete();
// for type 'jsonb'
JsonDocument jsonbDoc = JsonDocument.Parse(@"{ ""ModelEL"" : ""Square""}");
var box = new Box {
DocumentContent = jsonbDoc, ElementContent = jsonbDoc.RootElement
};
context.BulkInsert(new List <Box> {
box
});
JsonDocument jsonbDoc2 = JsonDocument.Parse(@"{ ""ModelEL"" : ""Circle""}");
var boxQuery = context.Boxes.AsQueryable().Where(a => a.BoxId <= 1);
boxQuery.BatchUpdate(new Box {
DocumentContent = jsonbDoc2, ElementContent = jsonbDoc2.RootElement
});
//var incrementStep = 100;
//var suffix = " Concatenated";
//query.BatchUpdate(a => new Item { Name = a.Name + suffix, Quantity = a.Quantity + incrementStep }); // example of BatchUpdate Increment/Decrement value in variable
}
