该题涉及到mysql中一些指令,先熟悉一下

MySQL指令

参考:https://www.cnblogs.com/zhuyongzhe/p/7686105.html

 1 mysql -u root -p                     以root权限登录,默认密码为空
 2 show databases;                  列出所有数据库
 3 drop table if exists hst;           如果存在表hst则先删除
 4 create database hst;                 创建数据库
 5 use hst;                          进入数据库
 6 create table student(
 7 id int auto_increment primary key,
 8 name varchar(50),
 9 sex varchar(20),
10 date varchar(50),
11 content varchar(100)
12 )default charset=utf8;            创建表
13 drop table student;                删除表
14 describe student;               查看表结构(desc student;)
15 
16 insert into student values(null,'aa','','1988-10-12','.....');    插入数据
17 select * from student;
18 select id,name from student;             查询id,name列
19 
20 update student set sex='' where id=4;    修改id为4的行性别为男
21 
22 delete from student where id=5;          删除id为5的行
23 
24 select * from student where date>'1988-1-2' and date<'1988-12-1';    andor
25 
26 select * from student where date between '1988-1-2' and '1988-12-1';    between            

python中使用MySQL指令

安装了mysql,python3.0先装好pymysql,在IDLE中测试下import pymysql是否报错,没有报错,完美。

1 import pymysql
2 db = pymysql.connect("localhost", "root", "", "test")  连接test数据库
3 cursor=db.cursor()
4 cursor.execute(sql语句)
5 db.commit()
6 db.close()

完整代码

 1 #!/user/bin/python
 2 #-*-coding:UTF-8 *-*
 3 
 4 import pymysql
 5 import random,string,uuid
 6 
 7 def generateN(len, count, cursor, db, database):
 8     getChars = lambda: string.ascii_letters+string.digits
 9     generate = lambda len: "".join(random.sample(getChars(), len))
10     for i in range(count):
11         sql = "insert into {0} (id,value) values ({1},'{2}')".format(database,"null", generate(len))
12         cursor.execute(sql)
13         db.commit()
14 
15 #generateN(10, 20)
16 db = pymysql.connect("localhost", "root", "", "hst")
17 cursor = db.cursor()
18 cursor.execute("drop table if exists generateCodes")
19 sql = "create table generateCodes(id int auto_increment primary key, value varchar(50))"
20 cursor.execute(sql)
21 cursor.execute("show tables");
22 generateN(10, 20, cursor, db, "generateCodes")
23 db.close()

期间出了2个问题

问题1:pymysql.err.InternalError: (1054, "Unknown column '***' in 'field list'")

参考:https://blog.csdn.net/fk103/article/details/80139284,原因是字符串占位符那里没有写'',将(values ({1},{2})修改为(values ({1},'{2}'))

问题2:插入第2个数据的时候Duplicate entry for key 'PRIMARY'

参考:https://blog.csdn.net/m0_37664906/article/details/79612006,主键重复了,将(database,i,**)修改为(database,"null",**)

执行脚本后,在控制台中查看表内容

1 select * from generateCodes;

好,结束。

posted on 2019-06-07 22:07  AnotherICE  阅读(206)  评论(0编辑  收藏  举报