_query_single_row()

rtreader.RasterReader._query_single_row (   self,   sql  )

protected

Definition at line 141 of file rtreader.py.

    def _query_single_row(self, sql):
        assert self._conn is not None
        #self._log(sql)
 
        try:
            cur = self._conn.cursor()
            cur.execute(sql)
        except Exception as e:
            raise RasterError("Failed to execute query %s: %s" % (sql, e))
 
        row = cur.fetchone()
        if row is None:
            raise RasterError("No tuples returned for query: %s" % sql)
        return row
 

References rtreader.RasterReader._conn.

Referenced by rtreader.RasterReader._query_pixel_types(), rtreader.RasterReader._query_raster_size(), and rtreader.RasterReader._query_value().

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