如何解决如何使用 MySQLdb 库使用 python 脚本执行 MySQL 查询?
我试图修改一个 ETL,但我发现老开发人员直接在连接上执行他的命令(ETL 已经运行了几年)。当我自己尝试执行此操作时,出现错误(因为我的编译器希望我从游标执行此操作)。
from etl.utils.logging import info
from etl.MysqL.connect import db,db_name
from etl.MysqL.operations import add_column_if_not_exists
from etl.utils.array import chunks
from pprint import pprint
def add_column_exclude_from_statistics():
with db as c:
# Create new columns where exclude_from_statistics
info("Creating column exclude from statistics")
c.execute("""
UPDATE orders
INNER JOIN contacts ON orders.id = contacts.`Contact ID`
IF contacts.`Great Benefactor` = true OR orders.Campaign = `nuit-pour-la-mission`
SET orders.exclude_from_statistics = 1
ELSE
SET orders.exclude_from_statistics = 0
;
""")
def main():
info("Table crm.orders")
add_column_exclude_from_statistics()
if __name__ == '__main__':
main()
但它返回'Connection' object has no attribute 'execute'
:
(venv) C:\Users\antoi\Documents\Programming\Work\data-tools>py -m etl.task.crm_orders_exclude_from_statistics
2021-06-25 17:12:44.357297 - Connecting to database hozana_data...
2021-06-25 17:12:44.365267 - Connecting to archive database hozana_archive...
2021-06-25 17:12:44.365267 - Table crm.orders
2021-06-25 17:12:44.365267 - Creating column exclude from statistics
Traceback (most recent call last):
File "C:\Users\antoi\AppData\Local\Programs\Python\python39\lib\runpy.py",line 197,in _run_module_as_main
return _run_code(code,main_globals,None,File "C:\Users\antoi\AppData\Local\Programs\Python\python39\lib\runpy.py",line 87,in _run_code
exec(code,run_globals)
File "C:\Users\antoi\Documents\Programming\Work\data-tools\etl\task\crm_orders_exclude_from_statistics.py",line 28,in <module>
main()
File "C:\Users\antoi\Documents\Programming\Work\data-tools\etl\task\crm_orders_exclude_from_statistics.py",line 24,in main
add_column_exclude_from_statistics()
File "C:\Users\antoi\Documents\Programming\Work\data-tools\etl\task\crm_orders_exclude_from_statistics.py",line 12,in add_column_exclude_from_statistic
s
c.execute("""
AttributeError: 'Connection' object has no attribute 'execute'
import os
import MysqLdb
from etl.utils.logging import info
db_host = os.environ['DB_HOST']
db_port = int(os.environ['DB_PORT'])
db_user = os.environ['DB_USER']
db_password = os.environ['DB_PASSWORD']
db_name = os.environ['DB_NAME']
db_name_archive = os.environ['DB_ARCHIVE_NAME']
info("Connecting to database {}...".format(db_name))
db = MysqLdb.connect(host=db_host,port=db_port,db=db_name,user=db_user,passwd=db_password)
这样做很奇怪,不是吗?是不是我的 MysqLdb
库不是最新的?
(venv) C:\Users\antoi\Documents\Programming\Work\data-tools>pip list |findstr MysqL
MysqL 0.0.3
mysql-connector-python 8.0.25
MysqLclient 2.0.3
解决方法
根据 documentation,您首先需要在连接打开后创建一个游标,因为“Connection”对象没有执行方法,但 Cursor 有,因此使用您的代码示例:
from etl.utils.logging import info
from etl.mysql.connect import db,db_name
from etl.mysql.operations import add_column_if_not_exists
from etl.utils.array import chunks
from pprint import pprint
def add_column_exclude_from_statistics():
with db as c:
# Create new columns where exclude_from_statistics
info("Creating column exclude from statistics")
cursor = c.cursor() #Get the cursor
cursor.execute("""
UPDATE orders
INNER JOIN contacts ON orders.id = contacts.`Contact ID`
IF contacts.`Great Benefactor` = true OR orders.Campaign = `nuit-pour-la-mission`
SET orders.exclude_from_statistics = 1
ELSE
SET orders.exclude_from_statistics = 0
;
""")
def main():
info("Table crm.orders")
add_column_exclude_from_statistics()
if __name__ == '__main__':
main()
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