ResultSetMetaData.isNullable
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 public abstract int isNullable( int column ) throws SQLException
Parameters
-  column 
-  the first column is 1, the second is 2, ...
    
Returns
     columnNoNulls, columnNullable or columnNullableUnknown
    Description
 Can you put a NULL in this column?
  
Exceptions
 SQLException
     if a database-access error occurs.