1.Dd December 19, 2018 2.Dt SQLITE3CHANGESET_PK 3 3.Os 4.Sh NAME 5.Nm sqlite3changeset_pk 6.Nd Obtain The Primary Key Definition Of A Table 7.Sh SYNOPSIS 8.Ft int 9.Fo sqlite3changeset_pk 10.Fa "sqlite3_changeset_iter *pIter" 11.Fa "unsigned char **pabPK" 12.Fa "int *pnCol " 13.Fc 14.Sh DESCRIPTION 15For each modified table, a changeset includes the following: 16.Bl -bullet 17.It 18The number of columns in the table, and 19.It 20Which of those columns make up the tables PRIMARY KEY. 21.El 22.Pp 23This function is used to find which columns comprise the PRIMARY KEY 24of the table modified by the change that iterator pIter currently points 25to. 26If successful, *pabPK is set to point to an array of nCol entries, 27where nCol is the number of columns in the table. 28Elements of *pabPK are set to 0x01 if the corresponding column is part 29of the tables primary key, or 0x00 if it is not. 30.Pp 31If argument pnCol is not NULL, then *pnCol is set to the number of 32columns in the table. 33.Pp 34If this function is called when the iterator does not point to a valid 35entry, SQLITE_MISUSE is returned and the output variables zeroed. 36Otherwise, SQLITE_OK is returned and the output variables populated 37as described above. 38