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ROLLBACK

Reverts a row in a tracked table to a previous revision.

Syntax

<ROLLBACK TABLE="TABLE_NAME" 
          ASSET="PRIMARY_KEY"
          [VERSION="VERSION_NUM"]/>

Parameters

TABLE (required)

Name of the table containing the row you want to revert to a previous version.

ASSET (required)

Value of the primary key for the row you want to revert to a previous version.

VERSION (optional)

Version to make current. Values for VERSION_NUM are:

• "first"- Roll back to earliest revision of record.
• "last"- Roll back to most recent revision of record.
• "#"- Roll back to a specific revision number.
• "date"- Roll back the record to whatever revision was current at the specified date. The date must be in SQL format (yyyy-mm-dd hh:mm:ss) and is expected to be GMT.

Description

The ROLLBACK tag reverts a row in a tracked table to a previous revision. The current user must have the row locked and have rtaudit privileges against the table to roll back the row. A row can be rolled back to its earliest revision, its most recent revision, a specific version number, or whatever revision was current at a specified date.

Error Numbers

The possible values of errno include:

Value	Description
-1000	Command failure. Check the errdetail variable for the specific error.

Example

This example assumes all ROLLBACK parameters are exposed on an HTML form. It first checks whether the parameters exist, clears any values from errno, and then performs a roll back on the row.

<!-- Make sure required parameters exist -->
<IF COND="IsVariable.tablename=false">
   <THEN>
      <SETVAR
 NAME="tablename" VALUE=""/>
   </THEN>
</IF>
<IF COND="IsVariable.asset=false">
   <THEN>
      <SETVAR
 NAME="asset" VALUE=""/>
   </THEN>
</IF>
<IF COND="IsVariable.version=false">
   <THEN>
      <SETVAR
 NAME="version" VALUE=""/>
   </THEN>
</IF>
<!-- clear out errno -->
<SETVAR
 NAME="errno" VALUE="0"/>
<!-- do the rollback -->
<ROLLBACK TABLE="Variables.tablename"
          ASSET="Variables.asset"
          VERSION="Variables.version"/>
<!-- see if the rollback succeeded -->
<IF COND="Variables.errno=0">
   <THEN>
      <!-- if succeeded, note it-->
      Rollback succeeded for 
      <CSVAR
 NAME="Variables.asset"/>
      <BR/>
   </THEN>
   <ELSE>
      <!-- otherwise, call an error reporting element -->
      Rollback failed.<BR/>
   </ELSE>
</IF> 

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