InsertCommand

An InsertCommand is a command object that represents the insertion of data into a target data store or collection. It is used within the Command design pattern to encapsulate all information needed to perform and undo an insertion, enabling features such as action replay, undo/redo, and queueing of operations. InsertCommand is applicable in systems ranging from text editors to databases and in-memory data structures.

Typical fields include target (the destination container or table), payload (the data to insert, such as a record or text segment), position or index (optional, for ordered collections), and options or metadata (such as conflict resolution or timestamp). The command may also include identifiers to locate the inserted item for undo operations.

Behavior: when executed, it performs the insertion and updates related state. When undone, it removes the inserted item. Some implementations support redo. Validation checks can verify that the insertion is valid and that no conflicts exist. Commands can be serialized for persistence or transmission.

Variants and context: in text editors, InsertCommand may insert characters or tokens; in databases, it corresponds to an INSERT operation or a row addition; in collections, it adds an element at a specific position. It can be combined with transactions or batched into groups.

See also: UpdateCommand, DeleteCommand, Command pattern, Undo/redo mechanisms.