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SQLITE3_CHANGES(3)         Library Functions Manual         SQLITE3_CHANGES(3)

NAME
     sqlite3_changes - Count The Number Of Rows Modified

SYNOPSIS
     int
     sqlite3_changes(sqlite3*);

DESCRIPTION
     This function returns the number of rows modified, inserted or deleted by
     the most recently completed INSERT, UPDATE or DELETE statement on the
     database connection specified by the only parameter.  Executing any other
     type of SQL statement does not modify the value returned by this
     function.

     Only changes made directly by the INSERT, UPDATE or DELETE statement are
     considered - auxiliary changes caused by  triggers, foreign key actions
     or REPLACE constraint resolution are not counted.

     Changes to a view that are intercepted by  INSTEAD OF triggers are not
     counted.  The value returned by sqlite3_changes() immediately after an
     INSERT, UPDATE or DELETE statement run on a view is always zero.  Only
     changes made to real tables are counted.

     Things are more complicated if the sqlite3_changes() function is executed
     while a trigger program is running.  This may happen if the program uses
     the changes() SQL function, or if some other callback function invokes
     sqlite3_changes() directly.  Essentially:

        Before entering a trigger program the value returned by
         sqlite3_changes() function is saved.  After the trigger program has
         finished, the original value is restored.

        Within a trigger program each INSERT, UPDATE and DELETE statement
         sets the value returned by sqlite3_changes() upon completion as
         normal.  Of course, this value will not include any changes performed
         by sub-triggers, as the sqlite3_changes() value will be saved and
         restored after each sub-trigger has run.

     This means that if the changes() SQL function (or similar) is used by the
     first INSERT, UPDATE or DELETE statement within a trigger, it returns the
     value as set when the calling statement began executing.  If it is used
     by the second or subsequent such statement within a trigger program, the
     value returned reflects the number of rows modified by the previous
     INSERT, UPDATE or DELETE statement within the same trigger.

     See also the sqlite3_total_changes() interface, the count_changes pragma,
     and the changes() SQL function.

     If a separate thread makes changes on the same database connection while
     sqlite3_changes() is running then the value returned is unpredictable and
     not meaningful.

SEE ALSO
     sqlite3_changes(3), sqlite3_total_changes(3)

NetBSD 8.0                      March 11, 2017                      NetBSD 8.0