在 python 和 mysql 中的特定日期范围内插入 csv 数据

Question

我只想将某个日期插入我的表中。我有这个代码。

当我只使用这段代码时，插入了 csv 中的所有数据

for row in readers:
     query4 = """INSERT INTO csv(
                 csv_id, Mchn, EnNO, Mode1,
                 IODMd, Date_Time)
                 VALUES(%s,%s,%s,%s,%s,%r)
                 """

     db.session.execute(query4 % (row[0], row[1], row[2], row[4], row[5], row[6],))
db.session.commit()

但我只想插入某个日期 所以我尝试在其上添加 WHERE。像这样

for row in readers:
    query4 = """INSERT INTO csv(
                csv_id, Mchn, EnNO, Mode1,
                IODMd, Date_Time)
                VALUES(%s,%s,%s,%s,%s,%r)
                WHERE Date_Time >= (select c_start_date from c_temp c where c.id = :id)
                AND Date_Time <= (select DATE_ADD(c_end_date,interval 1 day) from c_temp c where c.id = :id)"""

     db.session.execute(query4 % (row[0], row[1], row[2], row[4], row[5], row[6],))
db.session.commit()

但是当我尝试它时，它有一个错误并停止它。谢谢。

Answer 1

如果您想根据数据的日期时间过滤要插入的数据，您应该在创建 INSERT 语句之前评估数据。

import datetime

start_date = datetime.datetime(<value from db>)
db_end_date = datetime.datetime(<value from db>)
end_date = db_end_date + datetime.timedelta(days=1)

for row in readers:
     csvid, mchn, enno, model, iodmd, dt = row[:7]
     # parse incoming datetime value into a python datetime object
     # not sure what your format is here
     parsed_date = datetime.datetime.strptime(dt, "%Y-%m-%D")
     if start_date <= parsed_date <= end_date:
         query4 = """INSERT INTO csv(
                     csv_id, Mchn, EnNO, Mode1,
                     IODMd, Date_Time)
                     VALUES(%s,%s,%s,%s,%s,%r)
                  """

         db.session.execute(query4 % (csvid, mchn, enno, model, iodmd, dt,))
db.session.commit()