python_操作MySQL 初解 之__<类方法调用并 增-删-改-查>

                 1
                #
                 导入模块
                 2
                import
                 pymysql

                 3
                from sqls import *
 4# 创建类 5class KaoShi(object):
 6 7# 初始化 8def__init__(self):
 9         self.db = pymysql.connect(
10                  host=‘localhost‘,
11                  port=3306,
12                  user=‘root‘,
13                  passwd=‘1234‘,
14                  db=‘test‘15            )
16         self.cur = self.db.cursor()
1718# 实例对象销毁的时候，关闭游标和数据库19def__del__(self):
20        self.cur.close()
21        self.db.close()
2223# 插入24def insert01(self, q1):
25         m = str(tuple(q1))
26         sql = "insert students values %s" % m
27        self.cur.execute(sql)
28        self.db.commit()
2930# 查询31def select02(self, q):
32for k, v in q.items():
33             sql = ‘select * from students where %s = "%s"‘ % (k, v)
34            self.cur.execute(sql)
35for i in self.cur:
36print(i)
37print()
38             ret = self.cur.fetchall()
39# 返回多个元组40if ret:
41print(ret)
42else:
43print(‘没有找到 %s‘ % v)
4445# 更新46def update03(self, q1, q2):
47for k1, v1 in q1.items():
48             sql = "update students set %s = ‘%s‘ " % (k1, v1)
4950for k2, v2 in q2.items():
51             sql += " where %s = %d " % (k2, v2)
52print(sql)
53        self.cur.execute(sql)
54        self.db.commit()
5556# 删除57def delete04(self, q):
58print(q)
59for k, v in q.items():
60             sql = "delete from students where %s = ‘%s‘ " % (k, v)
61            self.cur.execute(sql)
62            self.db.commit()
6364# 查询65def count05(self, q):
66print(q)
67for k, v in q.items():
68             sql = ‘select count(*) from students where %s = "%s"‘ % (k, v)
69            self.cur.execute(sql)
70             ret = self.cur.fetchall()
71print(ret)
7273print(‘查询到的数量为：‘, ret[0][0])
7475# 插入5条数据76def insert06(self, q):
77print(q)
78        self.cur.execute(q)
79        self.db.commit()
8081# 删除82def delete07(self):
83# cur.execute(‘delete from students‘)84         self.cur.execute(‘truncate students‘)
85        self.db.commit()
868788 ks = KaoShi()
89ks.insert01(q1)
90ks.select02(q2)
91ks.update03(q3_1, q3_2)
92ks.delete04(q2)
93ks.count05(q5)
94ks.insert06(q6)
95 ks.delete07()

q1 = [0, ‘张三‘, 12, 1, ‘汉族‘, ‘八维学校附近地下室八层999‘, 13899998888]

q2 = {‘name‘: ‘王五‘}

q3_1 = {‘name‘: ‘李四‘}
q3_2 = {‘age‘: 12}

q5 = {‘nation‘: ‘汉‘}


q6 = """
    insert students values
        (0, ‘孙越‘, 18, 1, ‘汉‘, ‘北京‘, 13899994444),
        (0, ‘越‘, 16, 1, ‘满‘, ‘上海‘, 13899994488),
        (0, ‘王祖‘, 98, 1, ‘蒙古‘, ‘深圳‘, 13899004422),
        (0, ‘刘能‘, 70, 1, ‘契丹‘, ‘大连‘, 13899997799),
        (0, ‘曹操‘, 40, 1, ‘汉‘, ‘天津‘, 13899994400);
    """"""
create table students(
id int primary key auto_increment,
name varchar(20),
age tinyint,
gender enum ("男","女"),
nation char(5),13
address varchar(30),
tel varchar(20)
);
"""
x={‘cui‘:"热心的网友"}
for k,v in x.items():
    print(k)
    print(v)