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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
# Copyright (C) 2008 Salvo "LtWorf" Tomaselli
#
@ -449,30 +450,25 @@ class relation (object):
i[f_ids[k]]=str(dic[keys[k]])
return affected
def insert(self,values):
'''Inserts the values in the relation. If values[0] is not a list | tuple,
values will be inserted as a tuple. Otherwise values will be considered as a
table containing many tuples that will be inserted.
'''Inserts a touple in the relation.
This function will not insert duplicate tuples.
All the values will be converted in string.
Will return the number of inserted rows.'''
affected=0
l=len(self.header.attributes)
if str(values[0].__class__) == "<type 'tuple'>" or str(values[0].__class__) == "<type 'list'>":
for i in values:
if l==len(i) and i not in self.content:
affected+=1
t=[]
for q in i:
t.append(str(i))
self.content.append(t)
#Returns if touple doesn't fit the number of attributes
if len(self.header.attributes) != len(values):
return 0
#Creating list containing only strings
t=[]
for i in values:
t.append(str(i))
if t not in self.content:
self.content.append(t)
return 1
else:
if len(values)== l and values not in self.content:
t=[]
for q in values:
t.append(str(q))
self.content.append(t)
return 1
return affected
return 0
def delete(self,expr):
'''Delete, expr must be a valid boolean expression, can contain field names,