如何使用python插入mysql數據庫

Question

我正在寫一個python腳本，它允許插入到數據庫mysql中。 它沒有錯誤，並且“ select *” Python代碼提供了我發布的列表，但是當我在終端中編寫mysql -u root -p並select *它僅給出了我從終端放入數據庫的行–我從代碼中插入的那行不存在。

請你幫我一下。 謝謝。

cur.execute("INSERT INTO ALL_DEVICES(HOST_NAME,ADDRESS_MAC,ADDRESS_IP,TIME_SCAN,DATE,ETAT) VALUES(%s,%s,%s,%s,%s,%s)",(host_name1, address_mac1,address_ip1,time_scan1,date1,etat))   

cur.execute("SELECT * FROM ALL_DEVICES")

rows = cur.fetchall()

print rows 

結果是：

((2L, 'LKK', 'LLKK', 'KLK', 'KK', 'KJH', 'KLO'), (4L, 'LKK', 'LLKK', 'KLK', 'KK', 'KJH', 'KLO'), (5L, 'host_name1', 'address_mac1', 'address_ip1', 'tim', 'da', 'etat'), (9L, 'host_name1', 'address_mac1', 'address_ip1', 'tim', 'da', 'etat'), (19L, '', 'D8:3C:69:AA:02:E9', '192.168.1.3', '14:07', '21/03/15', 'Interdit'), (20L, '', 'D8:3C:69:AA:02:E9', '192.168.1.2', '4:07', '21/03/15', 'Interdit'), (21L, '', '2C:E4:12:54:7D:4F', '192.168.1.1', '14:07', '21/03/15', 'Interdit'))

然后在終端中選擇*給我：

mysql> select * from ALL_DEVICES;

| Id | HOST_NAME  | ADDRESS_MAC  | ADDRESS_IP  | TIME_SCAN | DATE | ETAT |
+----+------------+--------------+-------------+-----------+------+------+
|  2 | LKK        | LLKK         | KLK         | KK        | KJH  | KLO  |
|  4 | LKK        | LLKK         | KLK         | KK        | KJH  | KLO  |
|  5 | host_name1 | address_mac1 | address_ip1 | tim       | da   | etat |
|  9 | host_name1 | address_mac1 | address_ip1 | tim       | da   | etat |
+----+------------+--------------+-------------+-----------+------+------+
4 rows in set (0,00 sec)

Answer 1

您必須使用.commit() 。

讓

conn = connect("database")
cur = conn.cursor()
cur.execute("INSERT into ...")  #insert query

conn.commit() #you missed it

cur.execute("SELECT ...") #select query

Answer 2

itzmeontv說的是正確的。 除非您commit（），否則對數據庫的更改將不會保存。

從Python與sql數據庫進行交互的另一種方法是使用“ sqlalchemy”模塊。 這是一般流程：

from sqlalchemy import Column, ForeignKey, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

 database = "sqlite:////" + path + "/" + db_file
 self.engine = create_engine(database)
 Session = sessionmaker()
 Session.configure(bind=self.engine)
 self.session = Session()
 self.base = Base

# An example Table called train_info
class Traininfo(Base):
    __tablename__ = "train_info"
    train_name =   Column(String(250), primary_key=True)
    from_station = Column(String(150))
    to_station =   Column(String(150))
    direction =    Column(String(2))
    mode =         Column(String(2))
    date =         Column(String(64))

# Creating table and saving records in the table.
train_info = Traininfo(train_name = train_record[0],
                       from_station=train_record[1],
                       to_station=train_record[2],
                       direction=str(train_record[3]),
                       mode=str(train_record[4]),
                       date = train_record[5])
train_info.__table__.create(self.engine, checkfirst = True)

self.session.add(train_info)
self.session.commit()