SGBD/table.py

81 lines
2.2 KiB
Python

class Table:
def __init__(self, name):
self.name = name
self.columns = []
self.rows = []
def __str__(self):
return self.name
def __repr__(self):
return self.name
def _try_parse_int(self, value: str) -> int:
try:
return int(value)
except ValueError:
return value
def load_from_csv(self, csv_file):
with open(csv_file, 'r') as f:
reader = f.read().splitlines()
# Primeira linha contêm o nome das colunas
self.columns = reader[0].split(',')
reader.pop(0)
for row in reader:
row = row.split(',')
row_list = []
for column in row:
row_list.append(self._try_parse_int(column))
self.rows.append(row_list)
def load_from_mysql(self, table_name, cursor):
cursor.execute("SELECT * FROM " + table_name)
rows = cursor.fetchall()
for row in rows:
row_list = []
for col in row:
row_list.append(col)
self.rows.append(row_list)
'''
self.rows = [
["dp001", "Customer Service"]
]
'''
cursor.execute("SHOW COLUMNS FROM " + table_name)
columns = cursor.fetchall()
for row in columns:
self.columns.append(row[0])
def save_to_csv(self):
f = open("./source/" + self.name + ".csv", "w")
# gravar o cabeçalho
columns_line = ""
for i in range(len(self.columns)):
columns_line = columns_line + self.columns[i]
if i < len(self.columns) - 1:
columns_line = columns_line + ","
f.write(columns_line + '\n')
for line in range(len(self.rows)):
data_line = ""
for column in range(len(self.columns)):
data_line = data_line + str(self.rows[line][column])
if column < len(self.columns) - 1:
data_line = data_line + ","
f.write(data_line + '\n')
f.close()