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added insert method, can be used to add one touple per time into a relation and does integrity check (just prevents inserting duplicated entries)

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git-svn-id: http://galileo.dmi.unict.it/svn/relational/trunk@80 014f5005-505e-4b48-8d0a-63407b615a7c
This commit is contained in:
LtWorf 2009-02-10 12:11:32 +00:00
parent 907d95268b
commit 8d0830fd6b
1 changed files with 16 additions and 20 deletions
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36
relation.py
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@ -1,3 +1,4 @@
# -*- coding: utf-8 -*-
# Relational # Relational
# Copyright (C) 2008 Salvo "LtWorf" Tomaselli # Copyright (C) 2008 Salvo "LtWorf" Tomaselli
# #
@ -449,30 +450,25 @@ class relation (object):
i[f_ids[k]]=str(dic[keys[k]]) i[f_ids[k]]=str(dic[keys[k]])
return affected return affected
def insert(self,values): def insert(self,values):
'''Inserts the values in the relation. If values[0] is not a list | tuple, '''Inserts a touple in the relation.
values will be inserted as a tuple. Otherwise values will be considered as a
table containing many tuples that will be inserted.
This function will not insert duplicate tuples. This function will not insert duplicate tuples.
All the values will be converted in string. All the values will be converted in string.
Will return the number of inserted rows.''' Will return the number of inserted rows.'''
affected=0
l=len(self.header.attributes) #Returns if touple doesn't fit the number of attributes
if str(values[0].__class__) == "<type 'tuple'>" or str(values[0].__class__) == "<type 'list'>": if len(self.header.attributes) != len(values):
for i in values: return 0
if l==len(i) and i not in self.content:
affected+=1 #Creating list containing only strings
t=[] t=[]
for q in i: for i in values:
t.append(str(i)) t.append(str(i))
self.content.append(t)
if t not in self.content:
self.content.append(t)
return 1
else: else:
if len(values)== l and values not in self.content: return 0
t=[]
for q in values:
t.append(str(q))
self.content.append(t)
return 1
return affected
def delete(self,expr): def delete(self,expr):
'''Delete, expr must be a valid boolean expression, can contain field names, '''Delete, expr must be a valid boolean expression, can contain field names,