How to trap this error (comes from sqlite3)

cl at isbd.net cl at isbd.net
Tue Feb 9 06:57:49 EST 2016


I have the following code snippet populating a wxPython grid with data
from a database. :-

        #
        #
        # populate grid with data 
        #
        all = self.cur.execute("SELECT * from " + table + " ORDER by id ")
        for row in all:
            row_num = row[0]
            cells = row[1:]
            for col in range(len(cells)):
                if cells[col] != None and cells[col] != "null":
                    xx = cells[col]
                    if not isinstance(xx, basestring):
                        xx = str(xx)
                    print("row: ",row_num, "col: ", col, "value: ", xx)

                    self.SetCellValue(row_num, col, xx)


It works fine until it hits an invalid character in one of the
columns.  The print is just a temporary diagnostic.

The output I get, when it hits an invalid character is:-

    ('row: ', 5814, 'col: ', 9, 'value: ', u'')
    ('row: ', 5814, 'col: ', 10, 'value: ', '10.5')
    ('row: ', 5814, 'col: ', 11, 'value: ', u'')
    ('row: ', 5814, 'col: ', 12, 'value: ', u' Fuel (with inter-tank tap open) is at about 10.5 - 11cm in the sight glass before setting out.')
    ('row: ', 6186, 'col: ', 0, 'value: ', '0')
    Traceback (most recent call last):
      File "/home/chris/bin/pg.py", line 100, in <module>
        grid = Grid(frame, dbCon, table)
      File "/home/chris/bin/pg.py", line 52, in __init__
        self.SetCellValue(row_num, col, xx)
      File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/grid.py", line 2016, in SetCellValue
        return _grid.Grid_SetCellValue(*args, **kwargs)
    sqlite3.OperationalError: Could not decode to UTF-8 column 'dayno' with text '�'


It's absolutely right, there is a non-UTF character in the column.
However I don't want to have to clean up the data, it would take
rather a long time.  How can I trap the error and just put a Null or
zero in the datagrid?

Where do I put the try:/except: ?

-- 
Chris Green
·


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