笔记：Python连接MySQL数据库 类

1.导入pymysql库

import pymysql

2.实例属性

    def __init__(self,host,port,database,name,passwd,sql):
        self.host = host
        self.port = port
        self.database = database
        self.name = name
        self.passwd = passwd
        self.sql = sql

3.建立连接

def conn(self):
    coon = pymysql.connect( host=self.host,
                            port=self.port,
                            database=self.database,
                            user=self.name,
                            passwd=self.passwd)

4.建立游标

cur = coon.cursor()

5.判断SQL语句

try:
    if str(self.sql).startswith('s'):
        cur.execute(self.sql)
        all_score = cur.fetchall()
        for i in all_score:
            print(i)
    else:
        cur.execute(self.sql)
        coon.commit()

6.关闭游标，关闭连接

finally:
    cur.close()
    coon.close()

7.调用

if __name__ == '__main__':
    test1 = Mysql_Connect('127.0.0.1', 3306, 'mydb_test',
                          'root', '229544','select * from student_score')
    test1.conn()

8.完整代码

import pymysql

class Mysql_Connect():
    def __init__(self,host,port,database,name,passwd,sql):
        self.host = host
        self.port = port
        self.database = database
        self.name = name
        self.passwd = passwd
        self.sql = sql

    def conn(self):
        coon = pymysql.connect( host=self.host,
                                port=self.port,
                                database=self.database,
                                user=self.name,
                                passwd=self.passwd)
        cur = coon.cursor()

        try:
            if str(self.sql).startswith('s'):
                cur.execute(self.sql)
                all_score = cur.fetchall()
                for i in all_score:
                    print(i)
            else:
                cur.execute(self.sql)
                coon.commit()

        except:
            print('SQL有误')

        finally:
            cur.close()
            coon.close()

if __name__ == '__main__':
    test1 = Mysql_Connect('127.0.0.1', 3306, 'mydb_test',
                          'root', '229544','update student_score set name = "大狗" where id = 11')
    # test1.conn()
    test1.conn()