sqlite3.OperationalError：靠近“'...'”：語法錯誤

Question

輸入文件：

$ cat inputs.csv
'18-01-2019', 296.0
'18-01-2019', 296.0
'18-01-2019', 296.0

代碼：

import csv
import sqlite3
import pprint

conn = sqlite3.connect('metrics.db')
c = conn.cursor()

def read_file(filename):
    with open(filename, 'r') as f:
        yield from f

for row in read_file('inputs.csv'):

    data = row.split(',')
    values = '({}, {})'.format(data[0], data[1].strip())
    print('Values are: {}'.format(values))

    try:
        query = '\'INSERT INTO metric_db VALUES (?, ?)\', {}'.format(values)
        print('Query is: {}'.format(query))
        c.execute(query)
    except sqlite3.IntegrityError as e:
        pass

conn.commit()
conn.close()

輸出錯誤：

Values are: ('18-01-2019', 296.0)
Query is: 'INSERT INTO metric_db VALUES (?, ?)', ('18-01-2019', 296.0)
Traceback (most recent call last):
  File "write_to_db.py", line 21, in <module>
    c.execute(query)
sqlite3.OperationalError: near "'INSERT INTO metric_db VALUES (?, ?)'": syntax error

我認為這更容易。 關於此錯誤的很多 SO 線程。 但我還沒有到那里:(

Answer 1

更改您的查詢語句：

query = 'INSERT INTO metric_db VALUES  {}'.format(values)

編輯

為了避免SQL注入並使用正確的日期格式：

import csv
import sqlite3
import pprint
from datetime import datetime

conn = sqlite3.connect('metrics.db')
c = conn.cursor()

def read_file(filename):
    with open(filename, 'r') as f:
        yield from f

for row in read_file('inputs.csv'):

    data = row.split(',')
    values = '({}, {})'.format(data[0], data[1].strip())
    print('Values are: {}'.format(values))
    date_readed = datetime.strptime(data[0], '%d-%m-%Y').strftime('%Y-%m-%d')

    try:
        query = 'INSERT INTO metric_db VALUES (?, ?)'
        c.execute(query,(date_readed,data[1],))
    except sqlite3.IntegrityError as e:
        pass

conn.commit()
conn.close()

Answer 2

檢查您的 schema.sql 文件。 只需嘗試從教程中復制粘貼此文件即可。