== Modifying QSOs En Masse ==

DXKeeper supports a 3-step workflow that lets you identify a particular set of QSOs, and then make changes ''en masse'' to every QSO in that set.

 1. backup your log ('''Config''' window, '''Log''' tab, '''Backup''' button)

 1. isolate the desired set of QSOs in the '''Log Page Display''' by using the appropriate [[QSOFiltering| filter]]

 1. make the changes using the '''Advanced Sorts, Filters, and Modifiers''' window's '''Modify QSOs''' panel


The first step is mandatory whenever the "Modify QSOs" panel is involved because a small mistake in steps 2 or 3 could incorrectly modify large numbers of QSOs. And knowing that you can easily return your log to its initial state makes steps 2 and 3 less nerve-wracking.

How you accomplish the [[QSOFiltering| filtering]] depends on the set of QSOs you're trying to isolate. If you're seeking all QSOs with a particular callsign or entity, or after a particular date, you can accomplish this filtering using the '''Filter''' panel at the bottom of the '''Main''' window's '''Log QSOs''' tab. If you're trying to isolate all QSOs made during a specific time range, or on a particular band, or in a particular mode, then you can use the '''Advanced...''' window's '''UTC Filter''', '''Band Filter''', or '''Mode Filter''' panels respectively. Anything else can be accomplished the '''Advanced''' window's '''SQL Query Filters''' panel, which lets you filter your Log with an SQL expression. Such expressions can be simple, e.g. "all QRP QSOs":

TX_Power <=5

or complex, e.g. "all RTTY QSOs made with European stations last March that have been confirmed via LotW but not via QSL card":

(MODE='RTTY') and (CONT='EU') and (QSO_BEGIN between #2009-03-01# and #2009-04-01#) and (APP_DXKEEPER_LOTW_QSL_RCVD in ('Y','S','V')) and (not (QSL_RCVD in ('Y','S','V')))


The modification step is accomplished with the '''Modify QSOs''' panel at the bottom of the '''Advanced Sorts, Filters, and Modifiers''' window, which can be displayed by clicking the '''Adv''' button on the '''Main''' window's '''Log QSOs''' tab. The use of this panel is straightforward:

 a. choose the QSO item you wish to modify by setting the '''Item ADIF field name''' selector (all items are documented [[https://www.dxlabsuite.com/dxkeeper/Help/Items.htm|here]])

 a. specify the new value of the item in the '''Item new value''' box

 a. click the '''Mod button''' to update that item with the specified new value in all QSOs in the '''Log Page Display'''

If you must frequently apply the same set of changes to, say, your newly-imported QSOs, these changes can be specified in a [[http://www.dxlabsuite.com/dxkeeper/Help/Scripts.htm|script]] that can be reliably executed with a few mouse clicks. 

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