Defines column, column set, and index key structures.
The API has three key concepts: column, column set, and index key.
Column
A table in a database is defined by a set of columns. Each column has attributes such as a name, a type, and a maximum length (if text or binary).
A column definition is encapsulated by TDbCol .
Column set
A set of columns that describe a table are encapsulated in CDbColSet . The set can be iterated over using TDbColSetIter .
Index key
An index key orders one or more table columns (keys). It has attributes such as being unique or primary, a comparison specification for text columns, and a list of columns which make up the key.
The index key is encapsulated in CDbKey . A column for the key is encapsulated in TDbKeyCol .
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