pthon 基础 9.8 增加数据

#/usr/bin/python

#-*- coding:utf-8 -*-

#@Time   :2017/11/24 2:59

#@Auther :liuzhenchuan

#@File   :增加#数据.py

 

#select * from tmp     10行数据

#select * from tmp a ,tmp b, tmp c:   1000行数据=10*10*10

#tmp a   tmp b   tmp c   对应表1  表2  表3

 

#获得随机字符串的设计

#增加的数据是随机数据，rand()  函数生成0-1 的一个随机数

#shal()    对数字进行加密，然后就生成了一堆字符串

#concat()   拼接多个字符串的函数

#substr()    取多少个字符

 

#获得随机整数的设计

# rand()*50  通过rand() 函数获得一个0-1的数，然后再乘以50 取到的数就是0-50

# floor()  这个函数代表的是去尾法取整数

 

# 男女的设计

# rand()*10 /2  最后取余数

# 如果余数为1，就设置为M

#如果余数为0，就设置为F

 

import  MySQLdb

student = '''

    set @a = 10000;

    insert into student select @a := @a + 1, substr(concat(sha1(rand()), sha1(rand())), 1, 5+floor(rand()* 50)), case floor(rand()*10) mod 2 when 1 then "M" else "F" end, 20+floor(rand() * 8) from tmp a, tmp b, tmp c, tmp d;

'''

# insert into student select @i:=@i+1, substr(concat(sha1(rand()), sha1(rand())), 1, 3 + floor(rand() * 75)), case floor(rand()*10) mod 2 when 1 then 'M' else 'F' end, 25-floor(rand() * 5)  from tmp a, tmp b, tmp c, tmp d;

# 我用下去这种insert就会有同名字的学生名

 

course = '''set @i := 10;

            insert into course select @i:=@i+1, substr(concat(sha1(rand()), sha1(rand())), 1, 5 + floor(rand() * 45)),  100 + floor(rand() * 100) from tmp a;

'''

 

score = '''set @i := 10000;

            insert into score select @i := @i +1, floor(10001 + rand()*10000), floor(11 + rand()*10), floor(1+rand()*100) from tmp a, tmp b, tmp c, tmp d;

'''

teacher = '''set @i := 100;

           insert into teacher select @i:=@i+1, substr(concat(sha1(rand()), sha1(rand())), 1, 5 + floor(rand() * 80)) from tmp a, tmp b;

'''

 

 

def connect_mysql():

    db_config = {

        "host": "192.168.16.70",

        "port": 3306,

        "user": "root",

        "passwd": "123123",

        "db": "students",

        "charset": "utf8"

    }

    try:

        cnx = MySQLdb.connect(**db_config)

    except Exception as e:

        raise e

    return cnx

 

 

if __name__ == "__main__":

    cnx = connect_mysql()

    try:

        cus = cnx.cursor()

        cus.execute(student)

        cus.close()

 

        cus = cnx.cursor()

        cus.execute(course)

        cus.close()

 

        cus = cnx.cursor()

        cus.execute(score)

        cus.close()

 

        cus = cnx.cursor()

        cus.execute(teacher)

        cus.close()

 

        cnx.commit()

    except Exception as e:

        cnx.rollback()

        raise e

    finally:

        cnx.close()

 

 

查看数据库：

 

ysql> show tables;

+--------------------+

| Tables_in_students |

+--------------------+

| course             |

| score              |

| student            |

| teacher            |

| tmp                |

+--------------------+

mysql> select *from course limit 10;

+-------+---------------------------------------------+-----+

| couid | cname                                       | tid |

+-------+---------------------------------------------+-----+

|    11 | 86c85fe76342ff5e376264621                   | 100 |

|    12 | ccef65aa5b377ac39ddd7dc44                   | 143 |

|    13 | 0e8a391f36                                  | 146 |

|    14 | 6755d9fa73                                  | 146 |

|    15 | 8c79d4684d88065b1cecbe76                    | 143 |

|    16 | 6bf78ad3dd4f5db7751fcfff6e661d526e814c54    | 166 |

|    17 | 2210cf9debd4a096373fd452d057f5c0f           | 141 |

|    18 | 16e99f932a599ca8f940eeabebc04996c           | 126 |

|    19 | a839d37dffd0cdd80bc7d                       | 181 |

|    20 | 17601ade7e74aa81f3fdf23d47af85bf2e8ed232288 | 152 |

+-------+---------------------------------------------+-----+

10 rows in set (0.00 sec)

mysql> select *from score limit 10;

+-------+-------+-----+-------+

| sid   | stdid | cid | grade |

+-------+-------+-----+-------+

| 10001 | 10742 |  19 |    78 |

| 10002 | 14902 |  12 |    12 |

| 10003 | 12126 |  18 |    99 |

| 10004 | 17672 |  19 |     5 |

| 10005 | 16303 |  11 |    15 |

| 10006 | 17104 |  12 |    43 |

| 10007 | 18091 |  18 |    37 |

| 10008 | 15446 |  17 |    53 |

| 10009 | 17175 |  11 |    96 |

| 10010 | 16939 |  17 |   100 |

+-------+-------+-----+-------+

10 rows in set (0.00 sec)

mysql> select *from student limit 10;

+-------+-------------------------------------------------------+--------+-------+

| stdid | stdname                                               | gender | agent |

+-------+-------------------------------------------------------+--------+-------+

| 10001 | 05be2e1f6be2dba3496d                                  | M      |    27 |

| 10002 | 8d21176c8a4cad420d9adec8dd6022146ed0b69dabe80c56c91   | F      |    24 |

| 10003 | 582cf648fbb65fcae2eb0                                 | F      |    22 |

| 10004 | ece0f0bb303e98859d9d41b6f246864e22d86ad405048ee       | M      |    23 |

| 10005 | e484bfbd4011fcebfa0d18271975b0834a1ccedd              | M      |    26 |

| 10006 | bb1ecba374c1dbdda1be                                  | F      |    22 |

| 10007 | 0b30cf54b756d4665e8fc41c7450433f590aefc37c8ea9afbbe8e | M      |    27 |

| 10008 | 3cdf0dddcd8911386fd36b2bf3                            | F      |    27 |

| 10009 | f699c14f237ad1778fe2f1d                               | F      |    20 |

| 10010 | a4b36903fd1c0e2f8f4151706e9d95ebfdf068b2f             | F      |    27 |

+-------+-------------------------------------------------------+--------+-------+

10 rows in set (0.00 sec)

mysql> select *from teacher limit 10;

+-----+------------------------------------------------------------------------+

| tid | tname                                                                  |

+-----+------------------------------------------------------------------------+

| 101 | 7684b4b                                                                |

| 102 | 497c1eeb229d5faf8a88213f1a28ad5ceab755e222b832f50ef3b71f73860          |

| 103 | f7307                                                                  |

| 104 | 9c44341e4fd84d1545f5293df4762695e962540b39ebb528d58c509ab5             |

| 105 | d1cd631d236e48a8efccb032c833f867e863bbe361ef8cfd0869601                |

| 106 | 2cf3b9da2484eb560a8000be460f529dd17c                                   |

| 107 | edc0ad15105a4dde02214a482fd0ac695517e307999fb7695bf1f6cfead6           |

| 108 | 8109966982f40ad1819d9c94023f4227eb019bd779305c0b8e9a87a7b0ddd436e97842 |

| 109 | 76433                                                                  |

| 110 | 438032fb74888de54a09e2cbd846650c85079f8feda82                          |

+-----+------------------------------------------------------------------------+

10 rows in set (0.00 sec)