Result (gb.db)

This class represents the result of a SQL request.

Свойства

Available	Returns True if the result object contains one or more accessible database rows.
Connection	Returns the parent connection object.
Count	Returns the number of rows in the query result.
Editable	Return if the result is editable.
Fields	Returns a collection of the fields of the result.
Index	Returns the index of the current record, starting from zero.
Length	This is a synonymous for the Count property.
Max	Returns Result.Count - 1 (as long as the count is >= 0, otherwise -1 is returned).

Методы

All	Return the value of the specified field of each result record as an array.
Delete	Deletes the current record.
MoveFirst	Moves to the first record of the result.
MoveLast	Moves to the last record of the result.
MoveNext	Moves to the next record of the result.
MovePrevious	Moves to the previous record of the result.
MoveTo	Moves to a specified record.
Update	Updates the current record into the database, if this record has been modified and the Result is a read/write cursor.

Result Cursors

The Result object is a cursor i.e. a view of a constrained set of rows arising from the execution of the query by the database engine. The cursor, depending on how it was executed may or may not "lock" rows and tables in the database. Such locking enables guaranteed updates to be made to data in the database by only one user at a time. (This is fundamental to rdbms theory.)

In the Gambas db world these cursors are described, naturally enough, as read only and read/write. Different result returning methods from the Connection class return different cursor types:

Method	Result Type
Create	Read/Write
Edit	Read/Write
Exec	Read Only
Find	Read Only