将csv中的行插入mysql数据库答案

【问题标题】：Inserting rows from csv into mysql database将csv中的行插入mysql数据库
【发布时间】：2020-02-06 21:19:33
【问题描述】：

我正在提取给定文件夹中的所有 csv，并尝试将它们逐行插入到 mysql 数据库中。这是我的代码：

def upload_to_db(table, folder):

print('Uploading...', end='')

files = grab_files(folder)

# Connect to dfeventlogger database
connection = pymysql.connect(**eventlogger_config, charset='utf8mb4', cursorclass=pymysql.cursors.DictCursor)

try:
    with connection.cursor() as cursor:

        # Open each csv in the files list
        # and ignore column headers
        for file in files:
            csv_file = open_csv(file)
            csv_headers = csv_file[0]
            #csv_headers = tuple(csv_file[0]) #tried this too with no luck
            csv_data = csv_file[1:]

            # Insert each row of each csv into eventlogger table
            for row in csv_data:
                placeholders = ', '.join(['%s'] * len(row))
                sql = "INSERT INTO %s ( %s ) VALUES ( %s )" % (table, csv_headers, placeholders)
                print(csv_headers, '\n')
                print(sql, '\n')
                print(row)
                cursor.execute(sql, row)
    # Connection is not autocommit by default.
    # So you must commit to save your changes.
    connection.commit()

finally:
    connection.close()

print('Finished')

upload_to_db('gsSearchAnalyticsTest', 'some_folder')

这是输出：

Uploading...['date', 'site_id', 'site', 'landing_page', 'keyword', 'source', 'impressions', 'clicks', 'position'] 

INSERT INTO gsSearchAnalyticsTest ( ['date', 'site_id', 'site', 'landing_page', 'keyword', 'source', 'impressions', 'clicks', 'position'] ) VALUES ( %s, %s, %s, %s, %s, %s, %s, %s, %s ) 

['2018-01-01', '2', 'something.co.uk', 'something.co.uk/somewhere_in_the_world', 'somewhere in the world', 'uk', '1', '1', '2.000000000000']

ProgrammingError: (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '['date', 'site_id', 'site', 'landing_page', 'keyword', 'source', 'impressions', ' at line 1")

这是我想要做的：

从源数据库中提取数据
导出为 csv 并保存在某个文件夹中
提取并循环遍历文件夹中的所有 csv 文件并插入到目标数据库中

问题是，我的代码哪里出错了？又该如何纠正呢？

【问题讨论】：

标签： python mysql pymysql

【解决方案1】：

从查询“INSERT INTO gsSearchAnalyticsTest (['date',...]) VALUES (...)”中删除方括号

【讨论】：

从placeholders = ', '.join('%s' * len(row)) 中删除了方括号，但得到了ValueError: unsupported format character ',' (0x2c) at index 150
还尝试将 csv_headers 转换为元组并从 INSERT INTO %s ( %s ) 中删除括号仍然没有执行并得到 ProgrammingError

【解决方案2】：

当我将 csv_headers = csv_file[0] 转换为 csv_headers = ', '.join(csv_file[0]) 时，它起作用了

【讨论】：