With this method, you are working with the lowest set of the BF APIs. There is no business logic other than SQL data constraints checks. Therefore, it is preferred that you _do not use this method_. See [Entity objects](🔗) for other options for working with data.
Classes in this topic are available in the Mediachase.BusinessFoundation.Data.Sql and Mediachase.BusinessFoundation.Data.Sql.Management namespaces.
## CustomTableRow class
A CustomTableRow object represents an SQL user row. Use the CustomTableRow object and its properties and methods to retrieve, evaluate, insert, delete, and update the values in the table.
Create a new CustomTableRow object, passing the Table object to create a new record. After creating a new CustomTableRow, use the **index** property to set the column values. Finally, call the Update method of the CustomTableRow object to confirm the addition.
You can delete a row from the table by calling the Delete method of the CustomTableRow object. The removal occurs when you call the Delete method.
### Create a new record
Create a new CustomTableRow object, passing the Table object to create a new record. After creating a new CustomTableRow, use the index property to set the column values. Finally, call the Update method of the CustomTableRow object to confirm the addition. Use the PrimaryKeyId property to get the primary key for the record.
Business Foundation (BF) supports **Integer** and **Guid** as primary keys.
### Load a record from a table
You can load a record from a table by creating a new CustomTableRow bject with primary key id. If the record is not found, an ObjectNotFoundException exception is thrown.
### Select records from a table
Call the CustomTableRow.List statement to return an array of CustomTableRow objects from the table. The CustomTableRow class has several List methods.
|**Method **||**Description **|
|List(Table table)||Returns records from table|
|List(Table table, params SortingElement\ sorting)||Returns records from table sorted by specified sorting elements|
|List(Table table, params FilterElement\ filters)||Returns filtered records by specified filters|
|List(Table table, FilterElementCollection filters, SortingElementCollection sorting)||Returns filtered records by specified filters and sorted by specified sorting elements|
|List(Table table, FilterElementCollection filters, SortingElementCollection sorting, int start, int count)||Returns records at a specified position and a specified count only.|
See [Filtering and sorting](🔗).
### Get the total records count
Call the CustomTableRow.GetTotalCount statement to return the total record count.
### Extended methods
You can use the extended CustomTableRow.GetReader and CustomTableRow.GetTable methods to get records in the inner .NET formats.
### Delete a row
To delete a row from a table, call the Delete method of the CustomTableRow object. The removal occurs when you call the Delete method.
Use the CustomTableRow.Delete static method to delete rows without row loading.
**Example:** Deleting rows without reloading
Upon instantiating a SqlTransactionScope by calling SqlContext.BeginTransaction statement, the transaction manager determines which transaction to participate in. Once determined, the scope always participates in that transaction. You can obtain a reference to the ambient transaction by calling the TransactionScope property of the SqlContext class.
If no exception occurs within the transaction scope (that is, between the initialization of the SqlTransactionScope object and the calling of its Dispose method), the transaction in which the scope participates is allowed to proceed. If an exception occurs within the transaction scope, the transaction in which it participates is rolled back.
When your application completes work it wants to perform in a transaction, you should call the Commit method once to inform that transaction manager that it can commit the transaction. Failing to call this method aborts the transaction.
A call to the Dispose method marks the end of the transaction scope. Exceptions that occur after calling this method may not affect the transaction.
A call to the AddCallback method registers custom callback. You can use transaction callback to handle final transaction commit or rollback.
**Example:** Create a new record in the transaction scope
## SqlBlobStream class
A SqlBlobStream object exposes a Stream around a text, ntext, or image column, supporting both synchronous and asynchronous read and write operations.
To reduce the amount of memory used when writing a BLOB value, a common practice is to write the BLOB to the database in _chunks_. The process of writing a BLOB to a database in this way depends on the capabilities of your database.
Use the SqlBlobStream class to read, write, create or close text, ntext, or image values from a text, ntext, or image column, and to manipulate other file-related operating system handles, such as file.
SqlBlobStream objects support random access to files using the Seek method. Seek allows the read/write position to be moved to any position within the file. This is done with byte offset reference point parameters. The byte offset is relative to the seek reference point, which can be the beginning, the current position, or the end of the underlying file, as represented by the three properties of the SeekOrigin class.
**Example:** Using the SqlBlobStream class