标签：comm 安装mysql word 新建 命令 调用 none 乱码 color
一、安装mysql
二、安装第三方模块（python2.7下）
三、新建数据库
四、数据库的增、删、改、查
五、封装
1.1 首先安装mysql
sudo apt-get install mysql-server mysql-client
1.2 mysql的启动、停止、重启
service mysql start
service mysql stop
service mysql restart
1.3 允许远程连接
1.找到mysql配置文件并修改 sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf # bind-address=127.0.0.1 2.登录mysql，运行命令 grant all privileges on *.* to ‘root‘@‘%‘ identified by ‘mysql‘ with grant option; flush privileges;
3.重启 mysql
2.1 安装mysql模块
sudo pip install MySQL-python
pip install pymysql（python3）
2.2 建立与数据库的连接
1.创建对象：调用connect()方法
conn=connect(参数列表)
2.3 对象的方法
执行sql语句
创建对象：调用Connection对象的cursor()方法
cursor1=conn.cursor()
2.4 对象的属性
3.1 在student数据库中新建users表
使用sha1加密
create table users( id int primary key auto_increment, uname varchar(20), upwd char(40), isdelete bit default 0 );
3.2 加入测试数据
INSERT INTO users(`id`, `uname`, `upwd`, `isdelete`) VALUES (1, ‘user1‘, ‘40bd001563085fc35165329ea1ff5c5ecbdbbeef‘, b‘0‘); INSERT INTO users(`id`, `uname`, `upwd`, `isdelete`) VALUES (2, ‘user2‘, ‘51eac6b471a284d3341d8c0c63d0f1a286262a18‘, b‘0‘);
4.1 增加、修改、删除
1 # encoding=utf-8 2 import MySQLdb 3 4 try: 5 conn = MySQLdb.connect(host=‘localhost‘, port=3306, db=‘student‘, user=‘root‘, passwd=‘root‘, charset=‘utf8‘) 6 cur = conn.cursor() 7 # 增加 8 sql1 = "insert into users(id,uname) values(3,‘张三‘)" 9 # 修改 10 # sql = "update users set uname=‘李四‘ where id=4" 11 # 删除 12 # sql = "delete from users where id=5" 13 count = cur.execute(sql) 14 conn.commit() 15 cs1.close() 16 conn.close() 17 except Exception as e: 18 print e.message
4.2 查询
1. 查询一行数据 #encoding=utf8 import MySQLdb try: conn=MySQLdb.connect(host=‘localhost‘,port=3306,db=‘student‘,user=‘root‘,passwd=‘mysql‘,charset=‘utf8‘) cur=conn.cursor() cur.execute(‘select * from users where id=1‘) result=cur.fetchone() print result cur.close() conn.close() except Exception,e: print e.message 2. 查询多行数据 #encoding=utf8 import MySQLdb try: conn=MySQLdb.connect(host=‘localhost‘,port=3306,db=‘student‘,user=‘root‘,passwd=‘mysql‘,charset=‘utf8‘) cur=conn.cursor() cur.execute(‘select * from users‘) result=cur.fetchall() print result cur.close() conn.close() except Exception,e: print e.message
5.1 封装
# encoding=utf8 import MySQLdb import hashlib class MysqlHelper(): def __init__(self, host, port, db, user, passwd, charset=‘utf8‘): self.host = host self.port = port self.db = db self.user = user self.passwd = passwd self.charset = charset def connect(self): # 创建对象：调用connect()方法 self.conn = MySQLdb.connect(host=self.host, port=self.port, db=self.db, user=self.user, passwd=self.passwd, charset=self.charset) self.cursor = self.conn.cursor() def close(self): self.cursor.close() self.conn.close() # fetchone() ： # 返回单个的元组，也就是一条记录(row)，如果没有结果 # 则返回 # None # fetchall() ： # 返回多个元组，即返回多个记录(rows), 如果没有结果 # 则返回() # 需要注明：在MySQL中是NULL，而在Python中则是None def get_one(self, sql, params=()): result = None try: self.connect() self.cursor.execute(sql, params) result = self.cursor.fetchone() self.close() except Exception, e: print e.message return result def get_all(self, sql, params=()): list = () try: self.connect() self.cursor.execute(sql, params) list = self.cursor.fetchall() self.close() except Exception, e: print e.message return list def insert(self, sql, params=()): return self.__edit(sql, params) def update(self, sql, params=()): return self.__edit(sql, params) def delete(self, sql, params=()): return self.__edit(sql, params) def __edit(self, sql, params): count = 0 try: self.connect() # 创建对象：调用Connection对象的cursor() 方法 # 执行语句，返回受影响的行数: execute(operation[, parameters]) count = self.cursor.execute(sql, params) self.conn.commit() self.close() except Exception as e: print e return count
# encoding=utf-8 from MysqlHelper import MysqlHelper from hashlib import sha1 def main(): sqlhelper = MysqlHelper(‘127.0.0.1‘, 3306, ‘student‘, ‘root‘, ‘root‘) # 用户登录 sname = raw_input("请输入用户名：") spwd = raw_input("请输入密码:") # - update(arg):根据参数来更新hash对象， # 多个update调用相当于把所有参数连接起来的单个update调用 # - digest():返回hash字符串 # - hexdigest():返回hash字符串，16进制 # - copy():返回一个clone对象 s1 = sha1() s1.update(spwd) spwdSha1 = s1.hexdigest() sql = "select upwd from users where uname=%s" params = [sname] userinfo = sqlhelper.get_one(sql, params) if userinfo == None: print ‘用户名错误‘ elif userinfo[0] == spwdSha1: print ‘登录成功‘ else: print ‘密码错误‘ if __name__ == ‘__main__‘: main()
标签：comm 安装mysql word 新建 命令 调用 none 乱码 color
原文地址：https://www.cnblogs.com/Mint-diary/p/9601196.html
