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clear -- clear a database table
Name of table.
A dictionary of values.
A dictionary with an empty row.
This method clears all the attributes to values determined by
the types. Numeric types are set to 0, dates are set to
'today' and everything else is set to
the empty string. If the array argument is present, it is used as
the array and any entries matching attribute names are cleared
with everything else left unchanged.