def alterDropColumn(database: str, table: str, columnNumber: int) -> 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.alterDropColumn(database, table, columnNumber)
elif modoDB == "b":
retorno = b.alterDropColumn(database, table, columnNumber)
elif modoDB == "bplus":
retorno = bPlus.alterDropColumn(database, table, columnNumber)
elif modoDB == "dict":
retorno = dic.alterDropColumn(database, table, columnNumber)
elif modoDB == "isam":
retorno = isam.alterDropColumn(database, table, columnNumber)
elif modoDB == "json":
retorno = json.alterDropColumn(database, table, columnNumber)
elif modoDB == "hash":
retorno = hash.alterDropColumn(database, table, columnNumber)
return retorno
else:
return 2
except Exception:
return 1
def alterDropColumn(database, table, columnNumber):
if searchInMode(database) != None:
currentMode = searchInMode(database)
if currentMode == 'avl':
# avlList.append(tableNew)
return avl.alterDropColumn(database, table, columnNumber)
elif currentMode == 'b':
# bList.append(tableNew)
return b.alterDropColumn(database, table, columnNumber)
elif currentMode == 'bplus':
# bplusList.append(tableNew)
return bplus.alterDropColumn(database, table, columnNumber)
elif currentMode == 'dict':
# dictList.append(tableNew)
return DM.alterDropColumn(database, table, columnNumber)
elif currentMode == 'isam':
# isamList.append(tableNew)
return isam.alterDropColumn(database, table, columnNumber)
elif currentMode == 'json':
# jsonList.append(tableNew)
return j.alterDropColumn(database, table, columnNumber)
elif currentMode == 'hash':
# hashList.append(tableNew)
return Hash.alterDropColumn(database, table, columnNumber)
else:
return 2
def alterDropColumn(database: str, table: str, columnNumber: int) -> int:
"""Deletes a column of a table in a database
Parameters:\n
database (str): name of the database
table (str): name of the table
columnNumber (int): target column index
Returns:\n
0: successful operation
1: an error ocurred
2: non-existent database
3: non-existent table
4: column cannot be deleted
5: column index out of bounds
"""
bd = _Buscar(database)
if bd:
mode = bd[1]
val = -1
if mode == "avl":
val = avl.alterDropColumn(database, table, columnNumber)
elif mode == "b":
val = b.alterDropColumn(database, table, columnNumber)
elif mode == "bplus":
val = bplus.alterDropColumn(database, table, columnNumber)
elif mode == "hash":
val = hash.alterDropColumn(database, table, columnNumber)
elif mode == "isam":
val = isam.alterDropColumn(database, table, columnNumber)
elif mode == "json":
val = json.alterDropColumn(database, table, columnNumber)
elif mode == "dict":
val = dict.alterDropColumn(database, table, columnNumber)
return val
else:
return 2
def alterDropColumn(database, name_table, number_column):
ModeDB, indexDB = exist_Alter(database)
if ModeDB:
mode = ModeDB.get_mode()
if mode.lower().strip() == "avl":
return avl.alterDropColumn(database, name_table, number_column)
elif mode.lower().strip() == "b":
return b.alterDropColumn(database, name_table, number_column)
elif mode.lower().strip() == "bPlus".lower():
return bPlus.alterDropColumn(database, name_table, number_column)
elif mode.lower().strip() == "dict":
return diccionario.alterDropColumn(database, name_table, number_column)
elif mode.lower().strip() == "hash":
return hash.alterDropColumn(database, name_table, number_column)
elif mode.lower().strip() == "isam":
return isam.alterDropColumn(database, name_table, number_column)
elif mode.lower().strip() == "json":
return json.alterDropColumn(database, name_table, number_column)