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Only the Books whose status is “Available” is listed in the lookup field.
You should exclusively use these functions in order to retrieve or modify database content because these functions provide a high level of abstraction and guarantee that your database manipulation will work against different RDBMSes.
If you need information for previous Moodle version, take a look to the DML functions - pre 2.0 page.
For a detailed reference of changes, see the migration docs.
Let us illustrate this with the help of an example.
The application Library Manager has three forms: Books – To enter the details about each book with fields Name, Status and Author. The column ‘Status’ with values ‘Available’ and ‘Issued’, indicates whether the book is available in the library or is issued to any user.