/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/table.py
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revision 627 by bh, Wed Apr 2 15:03:19 2003 UTC revision 628 by jonathan, Wed Apr 9 10:09:15 2003 UTC
# Line 85  class Table: Line 85  class Table:
85    
86          return None          return None
87    
88        def field_range(self, fieldName):
89            """Finds the first occurences of the minimum and maximum values
90            in the table for the given field.
91    
92            This assumes that the standard comparison operators (<, >, etc.)
93            will work for the given data.
94    
95            Returns a tuple ((min, rec), (max, rec)) where:
96                min is the minimum value
97                max is the maximum value
98                rec is the record number where the value was found. One
99                    should check that the record number of min is not
100                    the same as the record number of max.
101    
102            Returns None if there are no records
103    
104            """
105    
106    
107            count = self.record_count()
108    
109            if count == 0:
110                return None
111    
112            rec = self.read_record(0)
113    
114            min = rec[fieldName]
115            min_rec = 0
116    
117            max = rec[fieldName]
118            max_rec = 0
119    
120            for i in range(1, count):
121                rec = self.read_record(i)
122                data = rec[fieldName]
123    
124                if data < min:
125                    min = data
126                    min_rec = rec
127                elif data > max:
128                    max = data
129                    max_rec = rec
130    
131            return ((min, min_rec), (max, max_rec))
132    
133        def GetUniqueValues(self, fieldName):
134            """Return a list of all unique entries in the table for the given
135            field name.
136            """
137    
138            dict = {}
139    
140            for i in range(0, self.record_count()):
141                rec = self.read_record(i)
142                data = rec[fieldName]
143    
144                if not dict.has_key(data):
145                    dict[data] = 0
146    
147            return dict.keys()
148    
149      def read_record(self, record):      def read_record(self, record):
150          """Return the record no. record as a dict mapping field names to values          """Return the record no. record as a dict mapping field names to values
151          """          """
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