def alterDropPK(database: str, table: str) -> int:
dbs = databases.find_all(database)
if dbs == []:
return 2
for db in dbs:
if db.mode == "avl":
result = avlMode.alterDropPK(database, table)
elif db.mode == "b":
result = BMode.alterDropPK(database, table)
elif db.mode == "bplus":
result = BPlusMode.alterDropPK(database, table)
elif db.mode == "dict":
result = DictMode.alterDropPK(database, table)
elif db.mode == "isam":
result = ISAMMode.alterDropPK(database, table)
elif db.mode == "json":
result = jsonMode.alterDropPK(database, table)
elif db.mode == "hash":
result = HashMode.alterDropPK(database, table)
if result != 3:
if result == 0:
db.tables.search(table).pk = []
for x in range(5):
try:
Serializable.commit(databases, "lista_bases_de_datos")
return result
except:
break
return 1
break
return result
def alterDropPK(database: str, table: str) -> int:
try:
retorno = 1
db = __buscarLlaveBaseDato(database)
if db is not None:
modoDB = db[0]
tablas = db[2]
if tablas:
if tablas.get(table) is not None:
modoDB = tablas[table]
if modoDB == "avl":
retorno = avl.alterDropPK(database, table)
elif modoDB == "b":
retorno = b.alterDropPK(database, table)
elif modoDB == "bplus":
retorno = bPlus.alterDropPK(database, table)
elif modoDB == "dict":
retorno = dic.alterDropPK(database, table)
elif modoDB == "isam":
retorno = isam.alterDropPK(database, table)
elif modoDB == "json":
retorno = json.alterDropPK(database, table)
elif modoDB == "hash":
retorno = hash.alterDropPK(database, table)
if retorno == 0:
pk = generalDict[database][3]
del pk[table]
generalDict[database][3] = pk
ser("data/info/datos.bin", generalDict)
return retorno
else:
return 2
except Exception:
return 1
def alterDropPK(database: str, table: str) -> int:
"""Deletes PKs of a table in a database
Parameters:\n
database (str): name of the database
table (str): name of the table
Returns:\n
0: successful operation
1: an error ocurred
2: non-existent database
3: non-existent table
4: non-existent PK
"""
bd = _database(database)
if bd:
tb = _table(database, table)
if tb:
mode = tb["modo"]
val = -1
if mode == "avl":
val = avl.alterDropPK(database, table)
elif mode == "b":
val = b.alterDropPK(database, table)
elif mode == "bplus":
val = bplus.alterDropPK(database, table)
elif mode == "hash":
val = hash.alterDropPK(database, table)
elif mode == "isam":
val = isam.alterDropPK(database, table)
elif mode == "json":
val = json.alterDropPK(database, table)
elif mode == "dict":
val = dict.alterDropPK(database, table)
if val == 0:
_table(database, table)["pk"]=[]
_Guardar()
return val
else:
return 3
else:
return 2