1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 import pymysql 4    5 # 创建连接 6 conn = pymysql.connect(host=‘127.0.0.1‘, port=3306, user=‘root‘, passwd=‘123‘, db=‘t1‘) 7 # 创建游标 8 cursor = conn.cursor() 9   10 # 执行SQL，并返回收影响行数11 effect_row = cursor.execute("update hosts set host = ‘1.1.1.2‘")12   13 # 执行SQL，并返回受影响行数14 #effect_row = cursor.execute("update hosts set host = ‘1.1.1.2‘ where nid > %s", (1,))15   16 # 执行SQL，并返回受影响行数17 #effect_row = cursor.executemany("insert into hosts(host,color_id)values(%s,%s)", [("1.1.1.11",1),("1.1.1.11",2)])18   19   20 # 提交，不然无法保存新建或者修改的数据21 conn.commit()22   23 # 关闭游标24 cursor.close()25 # 关闭连接26 conn.close()

 1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 import pymysql 4    5 conn = pymysql.connect(host=‘127.0.0.1‘, port=3306, user=‘root‘, passwd=‘123‘, db=‘t1‘) 6 cursor = conn.cursor() 7 cursor.executemany("insert into hosts(host,color_id)values(%s,%s)", [("1.1.1.11",1),("1.1.1.11",2)]) 8 conn.commit() 9 cursor.close()10 conn.close()11   12 # 获取最新自增ID13 new_id = cursor.lastrowid

 1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 import pymysql 4    5 conn = pymysql.connect(host=‘127.0.0.1‘, port=3306, user=‘root‘, passwd=‘123‘, db=‘t1‘) 6 cursor = conn.cursor() 7 cursor.execute("select * from hosts") 8    9 # 获取第一行数据10 row_1 = cursor.fetchone()11   12 # 获取前n行数据13 # row_2 = cursor.fetchmany(3)14 # 获取所有数据15 # row_3 = cursor.fetchall()16   17 conn.commit()18 cursor.close()19 conn.close()

 1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 import pymysql 4    5 conn = pymysql.connect(host=‘127.0.0.1‘, port=3306, user=‘root‘, passwd=‘123‘, db=‘t1‘) 6    7 # 游标设置为字典类型 8 cursor = conn.cursor(cursor=pymysql.cursors.DictCursor) 9 r = cursor.execute("call p1()")10   11 result = cursor.fetchone()12   13 conn.commit()14 cursor.close()15 conn.close()

 1     作业： 2         参考表结构： 3             用户类型 4  5             用户信息 6  7             权限 8  9             用户类型&权限10         功能：11 12             # 登陆、注册、找回密码13             # 用户管理14             # 用户类型15             # 权限管理16             # 分配权限17 18         特别的：程序仅一个可执行文件

 1 import pymysql 2  3 user = input("username:") 4 pwd = input("password:") 5  6 conn = pymysql.connect(host="localhost",user=‘root‘,password=‘‘,database="db666") 7 cursor = conn.cursor() 8 sql = "select * from userinfo where username=‘%s‘ and password=‘%s‘" %(user,pwd)    #这段代码提到了注入问题，直接拼接会被他人任意登入，风险很大，所以不能这样写！ 9 # select * from userinfo where username=‘uu‘ or 1=1 -- ‘ and password=‘%s‘    #这里就是利用了注入问题登入了数据库10 cursor.execute(sql)11 result = cursor.fetchone()12 cursor.close()13 conn.close()14 15 if result:16     print(‘登录成功‘)17 else:18     print(‘登录失败‘)

 1 import pymysql 2  3 user = input("username:") 4 pwd = input("password:") 5  6 conn = pymysql.connect(host="localhost",user=‘root‘,password=‘‘,database="db666") 7 cursor = conn.cursor() 8 sql = "select * from userinfo where username=%s and password=%s" 9 cursor.execute(sql,user,pwd)10 # cursor.execute(sql,[user,pwd])11 # cursor.execute(sql,{‘u‘:user,‘p‘:pwd})12 result = cursor.fetchone()13 cursor.close()14 conn.close()15 if result:16     print(‘登录成功‘)17 else:18     print(‘登录失败‘)

 1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 from sqlalchemy import create_engine 4    5    6 engine = create_engine("mysql+pymysql://root:123@127.0.0.1:3306/t1", max_overflow=5) 7    8 # 执行SQL 9 # cur = engine.execute(10 #     "INSERT INTO hosts (host, color_id) VALUES (‘1.1.1.22‘, 3)"11 # )12   13 # 新插入行自增ID14 # cur.lastrowid15   16 # 执行SQL17 # cur = engine.execute(18 #     "INSERT INTO hosts (host, color_id) VALUES(%s, %s)",[(‘1.1.1.22‘, 3),(‘1.1.1.221‘, 3),]19 # )20   21   22 # 执行SQL23 # cur = engine.execute(24 #     "INSERT INTO hosts (host, color_id) VALUES (%(host)s, %(color_id)s)",25 #     host=‘1.1.1.99‘, color_id=326 # )27   28 # 执行SQL29 # cur = engine.execute(‘select * from hosts‘)30 # 获取第一行数据31 # cur.fetchone()32 # 获取第n行数据33 # cur.fetchmany(3)34 # 获取所有数据35 # cur.fetchall()

 1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 from sqlalchemy.ext.declarative import declarative_base 4 from sqlalchemy import Column, Integer, String, ForeignKey, UniqueConstraint, Index 5 from sqlalchemy.orm import sessionmaker, relationship 6 from sqlalchemy import create_engine 7   8 engine = create_engine("mysql+pymysql://root:123@127.0.0.1:3306/t1", max_overflow=5) 9  10 Base = declarative_base()11  12 # 创建单表13 class Users(Base):14     __tablename__ = ‘users‘15     id = Column(Integer, primary_key=True)16     name = Column(String(32))17     extra = Column(String(16))18  19     __table_args__ = (20     UniqueConstraint(‘id‘, ‘name‘, name=‘uix_id_name‘),21         Index(‘ix_id_name‘, ‘name‘, ‘extra‘),22     )23  24  25 # 一对多26 class Favor(Base):27     __tablename__ = ‘favor‘28     nid = Column(Integer, primary_key=True)29     caption = Column(String(50), default=‘red‘, unique=True)30  31  32 class Person(Base):33     __tablename__ = ‘person‘34     nid = Column(Integer, primary_key=True)35     name = Column(String(32), index=True, nullable=True)36     favor_id = Column(Integer, ForeignKey("favor.nid"))37  38  39 # 多对多40 class Group(Base):41     __tablename__ = ‘group‘42     id = Column(Integer, primary_key=True)43     name = Column(String(64), unique=True, nullable=False)44     port = Column(Integer, default=22)45  46  47 class Server(Base):48     __tablename__ = ‘server‘49  50     id = Column(Integer, primary_key=True, autoincrement=True)51     hostname = Column(String(64), unique=True, nullable=False)52  53  54 class ServerToGroup(Base):55     __tablename__ = ‘servertogroup‘56     nid = Column(Integer, primary_key=True, autoincrement=True)57     server_id = Column(Integer, ForeignKey(‘server.id‘))58     group_id = Column(Integer, ForeignKey(‘group.id‘))59  60  61 def init_db():62     Base.metadata.create_all(engine)63  64  65 def drop_db():66     Base.metadata.drop_all(engine)

 1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 from sqlalchemy.ext.declarative import declarative_base 4 from sqlalchemy import Column, Integer, String, ForeignKey, UniqueConstraint, Index 5 from sqlalchemy.orm import sessionmaker, relationship 6 from sqlalchemy import create_engine 7  8 engine = create_engine("mysql+pymysql://root:123@127.0.0.1:3306/t1", max_overflow=5) 9 10 Base = declarative_base()11 12 # 创建单表13 class Users(Base):14     __tablename__ = ‘users‘15     id = Column(Integer, primary_key=True)16     name = Column(String(32))17     extra = Column(String(16))18 19     __table_args__ = (20     UniqueConstraint(‘id‘, ‘name‘, name=‘uix_id_name‘),21         Index(‘ix_id_name‘, ‘name‘, ‘extra‘),22     )23 24     def __repr__(self):25         return "%s-%s" %(self.id, self.name)26 27 # 一对多28 class Favor(Base):29     __tablename__ = ‘favor‘30     nid = Column(Integer, primary_key=True)31     caption = Column(String(50), default=‘red‘, unique=True)32 33     def __repr__(self):34         return "%s-%s" %(self.nid, self.caption)35 36 class Person(Base):37     __tablename__ = ‘person‘38     nid = Column(Integer, primary_key=True)39     name = Column(String(32), index=True, nullable=True)40     favor_id = Column(Integer, ForeignKey("favor.nid"))41     # 与生成表结构无关，仅用于查询方便42     favor = relationship("Favor", backref=‘pers‘)43 44 # 多对多45 class ServerToGroup(Base):46     __tablename__ = ‘servertogroup‘47     nid = Column(Integer, primary_key=True, autoincrement=True)48     server_id = Column(Integer, ForeignKey(‘server.id‘))49     group_id = Column(Integer, ForeignKey(‘group.id‘))50     group = relationship("Group", backref=‘s2g‘)51     server = relationship("Server", backref=‘s2g‘)52 53 class Group(Base):54     __tablename__ = ‘group‘55     id = Column(Integer, primary_key=True)56     name = Column(String(64), unique=True, nullable=False)57     port = Column(Integer, default=22)58     # group = relationship(‘Group‘,secondary=ServerToGroup,backref=‘host_list‘)59 60 61 class Server(Base):62     __tablename__ = ‘server‘63 64     id = Column(Integer, primary_key=True, autoincrement=True)65     hostname = Column(String(64), unique=True, nullable=False)66 67 68 69 70 def init_db():71     Base.metadata.create_all(engine)72 73 74 def drop_db():75     Base.metadata.drop_all(engine)76 77 78 Session = sessionmaker(bind=engine)79 session = Session()80 81 表结构 + 数据库连接

1 obj = Users(name="alex0", extra=‘sb‘)2 session.add(obj)3 session.add_all([4     Users(name="alex1", extra=‘sb‘),5     Users(name="alex2", extra=‘sb‘),6 ])7 session.commit()

 1 #　条件 2 ret = session.query(Users).filter_by(name=‘alex‘).all() 3 ret = session.query(Users).filter(Users.id > 1, Users.name == ‘eric‘).all() 4 ret = session.query(Users).filter(Users.id.between(1, 3), Users.name == ‘eric‘).all() 5 ret = session.query(Users).filter(Users.id.in_([1,3,4])).all() 6 ret = session.query(Users).filter(~Users.id.in_([1,3,4])).all() 7 ret = session.query(Users).filter(Users.id.in_(session.query(Users.id).filter_by(name=‘eric‘))).all() 8 from sqlalchemy import and_, or_ 9 ret = session.query(Users).filter(and_(Users.id > 3, Users.name == ‘eric‘)).all()10 ret = session.query(Users).filter(or_(Users.id < 2, Users.name == ‘eric‘)).all()11 ret = session.query(Users).filter(12     or_(13         Users.id < 2,14         and_(Users.name == ‘eric‘, Users.id > 3),15         Users.extra != ""16     )).all()17 18 19 # 通配符20 ret = session.query(Users).filter(Users.name.like(‘e%‘)).all()21 ret = session.query(Users).filter(~Users.name.like(‘e%‘)).all()22 23 # 限制24 ret = session.query(Users)[1:2]25 26 # 排序27 ret = session.query(Users).order_by(Users.name.desc()).all()28 ret = session.query(Users).order_by(Users.name.desc(), Users.id.asc()).all()29 30 # 分组31 from sqlalchemy.sql import func32 33 ret = session.query(Users).group_by(Users.extra).all()34 ret = session.query(35     func.max(Users.id),36     func.sum(Users.id),37     func.min(Users.id)).group_by(Users.name).all()38 39 ret = session.query(40     func.max(Users.id),41     func.sum(Users.id),42     func.min(Users.id)).group_by(Users.name).having(func.min(Users.id) >2).all()43 44 # 连表45 46 ret = session.query(Users, Favor).filter(Users.id == Favor.nid).all()47 48 ret = session.query(Person).join(Favor).all()49 50 ret = session.query(Person).join(Favor, isouter=True).all()51 52 53 # 组合54 q1 = session.query(Users.name).filter(Users.id > 2)55 q2 = session.query(Favor.caption).filter(Favor.nid < 2)56 ret = q1.union(q2).all()57 58 q1 = session.query(Users.name).filter(Users.id > 2)59 q2 = session.query(Favor.caption).filter(Favor.nid < 2)60 ret = q1.union_all(q2).all()