python更新数据库脚本两种方法

 1 import MySQLdb
 2 #主机名
 3 HOST = '127.0.0.1'
 4 #用户名
 5 USER = "root"
 6 #密码
 7 PASSWD = "123456"
 8 #数据库名
 9 DB = "db_name"
10 # 打开数据库连接
11 db=MySQLdb.connect(HOST,USER,PASSWD,DB)
12 # 获取操作游标
13 cursor=db.cursor()
14 
15 if __name__ == '__main__':
16 
17     if cursor:
18         command_a = "update tables_one set status=5 where status=0"
19         # 使用execute方法执行SQL语句
20         cursor.execute(command_a)
21         # 提交到数据库执行
22         db.commit()
23 
24         command2 = "select field from tables_one where id =12"
25         ret2 = cursor.execute(command2)
26         # 获取所有记录列表
27         ret2=cursor.fetchall()
28         for item in ret2:
29                 command3 = "insert into tables_two(name) values (%s);" % (item[0])
30                 fin=cursor.execute(command3)
31                 db.commit()
32         # 关闭数据库连接
33         db.close()

 1 # -*- coding:utf-8 -*-
 2 from flask import Flask
 3 from flask_sqlalchemy import SQLAlchemy
 4 from sqlalchemy.sql import text
 5 
 6 HOST = '127.0.0.1'
 7 USER = "root"
 8 PASSWD = "123456"
 9 DB = "carrier_test"
10 CHARTSET = "utf8"
11 
12 app = Flask(__name__,instance_relative_config = True)
13 #链接数据库路径
14 app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://%s:%s@127.0.0.1:3306/%s?charset=%s' %(USER,PASSWD,DB,CHARTSET)
15 #如果设置成 True (默认情况)，Flask-SQLAlchemy 将会追踪对象的修改并且发送信号。这需要额外的内存， 如果不必要的可以禁用它。
16 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
17 #如果设置成 True，SQLAlchemy 将会记录所有 发到标准输出(stderr)的语句，这对调试很有帮助。
18 app.config['SQLALCHEMY_ECHO'] = False
19 # 数据库连接池的大小。默认是数据库引擎的默认值 （通常是 5）。
20 app.config['SQLALCHEMY_POOL_SIZE'] = 6
21 db = SQLAlchemy(app)
22 
23 class Table_one(db.Model):
24     __tablename__ = 'table_one'
25 
26     id = db.Column('id', db.Integer, primary_key=True, autoincrement=True)
27     com_name = db.Column('com_name', db.String(30), nullable=False)
28     com_about = db.Column('com_about', db.String(200), nullable=False)
29 
30     def __repr__(self):
31         return '<table_one com_name %r>' % self.com_name
32 
33 
34 class Table_two(db.Model):
35     __tablename__ = 'table_two'
36 
37     id = db.Column('id', db.Integer, primary_key=True, autoincrement=True)
38     reason = db.Column('reason', db.String(128), nullable=True)
39     create_time = db.Column('create_time', db.TIMESTAMP, server_default=text('now()'))
40     status = db.Column('status', db.Integer, nullable=False, default=0)
41 
42     def __repr__(self):
43         return '<table_two id %r>' % self.id
44 
45 def db_commit_all(lists):
46     try:
47         db.session.add_all(lists)
48         db.session.commit()
49         return 'SUCCESS'
50     except Exception,e:
51         return 'Fail!!!'
52 
53 def commits_to_three_judge():
54     com_sta_obj = Table_one.query.filter_by(com_name='只是测试使用,不用关心表间关系').all()
55     for ite in com_sta_obj:
56         ship_obj = Table_two.query.filter_by(id=ite.id).first()
57         if ship_obj:
58             if int(ship_obj.status) == 2:
59                 ite.status = 0
60                 print db_commit_all([ite])
61     print '表同步结束'
62 
63 64 
65 if __name__=='__main__':
66     #执行更新数据库函数
67     commits_to_three_judge()