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Update mode
Source position: db.pas line 61
type TUpdateMode = (  | 
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upWhereAll,  | 
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Use all old field values  | 
upWhereChanged,  | 
  | 
Use only old field values of modified fields  | 
upWhereKeyOnly  | 
  | 
Only use key fields in the where clause.  | 
);  | 
TUpdateMode determines how the WHERE clause of update queries for SQL databases should be constructed.