Python操作使用MySQL数据库的实例代码

#!/usr/bin/python
# coding=utf-8
import pymysql
# 连接本地数据库
conn = pymysql.connect(host='localhost', port=3306, user='root', passwd='a123', db='samp_db1', charset='utf8')
cursor = conn.cursor()
cursor.execute('select * from bigstu')
for row in cursor.fetchall():
  print(row)
# 查
cursor.execute('select id, name from bigstu where age > 22')
for res in cursor.fetchall():
  print(str(res[0]) + ", " + res[1])
cursor.close()
print('-- end --')

(1, '张三', '男', 24, datetime.date(2017, 3, 29), '13666665555')
(6, '小刚', '男', 23, datetime.date(2017, 3, 11), '778899888')
(8, '小霞', '女', 20, datetime.date(2017, 3, 13), '13712345678')
(12, '小智', '男', 21, datetime.date(2017, 3, 7), '13787654321')
1, 张三
6, 小刚
-- end --

insertSql = "insert into bigstu (name, sex, age, mobile) values ('%s','%s',%d,'%s') "
xiuji = ('秀吉', '男', 15, '13400001111')
cursor.execute(insertSql % xiuji)
conn.commit() # 别忘了提交

addCo = "alter table bigstu add cash int after mobile"
cursor.execute(addCo)

addCo = "alter table bigstu add cash int default 0 after mobile"
cursor.execute(addCo)

deleteSql = "delete from bigstu where name = '%s'"
cursor.execute(deleteSql % '秀吉')

dropCo = "alter table bigstu drop cash"
cursor.execute(dropCo)

updateSql = "update bigstu set sex = '%s' where name = '%s'"
updateXiuji = ('秀吉', '秀吉') # 秀吉的性别是秀吉
cursor.execute(updateSql % updateXiuji)
conn.commit()

table = "bigstu"
addCash = "update " + table + " set cash = cash + '%d' where name = '%s'"
lucky = (1000, "秀吉")
try:
  cursor.execute(addCash % lucky)
except Exception as e:
  conn.rollback()
  print("加钱失败了")
else:
  conn.commit()

import pymysql
import json
import os
import secureUtils
mapping_keys = json.load(open("key_mapping_db.json", "r"))
db_keys = [] # json中所有的key
for k in mapping_keys.values():
  db_keys.append(k)
conn = pymysql.connect(host='localhost', port=3306, user='root',
            passwd='*****', db='db_name', charset='utf8')
cursor = conn.cursor()
table_main = "table_main"
main_table_keys = [] # 主表的列名
cursor.execute("show columns from " + table_main)
for row in cursor.fetchall():
  main_table_keys.append(row[0])
staff_table_keys = []
cursor.execute("show columns from table_second")
for row in cursor.fetchall():
  staff_table_keys.append(row[0])
need_to_insert_keys = []
for k in db_keys:
  if k not in staff_table_keys and k not in main_table_keys and k not in need_to_insert_keys:
    need_to_insert_keys.append(k)
print("need to insert " + str(len(need_to_insert_keys)))
print(need_to_insert_keys)
for kn in need_to_insert_keys:
  print("add key to db " + kn)
  cursor.execute("alter table staff_table add " + kn +" text")
conn.close()

# change column character set to utf8
for co in main_table_keys:
  change_sql = "alter table " + table_main + " modify " + co + " text character set utf8"
  print(change_sql)
  cursor.execute(change_sql)