Difference between revisions of "ROLLBACK TIMELINE"

Revision as of 09:44, 6 July 2011

Purpose

Rolls back transactions stored in the database timeline

Syntax

ROLLBACK TIMELINE [RANGE <expC1> [, <expC2>]] [FOR <expL>]

See Also

CLEAR TIMELINE, DTOS(), DISPLAY TIMELINE, LIST TIMELINE, SET TIMELINE, SET TIMESTAMP, SYSTIMELINE, UNWATCH(), WATCH(), WATCHCHANGED(), WATCHING(), WATCHRESET()

Description

ROLLBACK TIMELINE rolls back transactions stored in the database timeline. Database timelines provide row versioning for Recital database applications. Whenever a change is made to a table that is timeline enabled, delta changes are automatically recorded for each transaction.

The optional RANGE <expC1> [, <expC2>] clause allows the rollback to be restricted to transactions from a particular date <expC1> or transactions that fall between two inclusive dates: <expC1> and <expC2>. The dates must be specified as strings in the format YYYYMMDDHH:MM:SS (including the time) or YYYYMMDD (date only). The DTOS() function can be used to convert date data type values to YYYYMMDD format. HH:MM:SS is the standard time format returned by the TIME() function.

The optional FOR <expL> clause, where <expL> is a valid logical expression, can also be used to restrict the rollback. For a structure listing of the database timeline storage table, please see SYSTIMELINE.

To enable database timelines simply issue the SET TIMELINE ON command in your Recital configuration file. SET TIMELINE is OFF by default.

Example

rollback timeline range dtos(date()-10), dtos(date()) for table = "example"

Products

Recital, Recital Server