python3 mysql操作封装_Python3 Mysql连库及简单封装使用

#!/usr/bin/python

# -*- coding: UTF-8 -*-

# author: xu3352

# python3 环境"""

Python Mysql 工具包

1. 通过 db_config.json 加载数据库配置

2. 常规的增删改查进行封装

注意事项:

1. %s 为 mysql 占位符; 能用 %s 的地方就不要自己拼接 sql 了

2. sql 里有一个占位符可使用 string 或 number; 有多个占位符可使用 tuple|list

3. insertmany 的时候所有字段使用占位符 %s (预编译), 参数使用 tuple|list

4. queryall 结果集只有一列的情况, 会自动转换为简单的列表 参考:simple_list()

5. queryone 结果集只有一行一列的情况, 自动转为结果数据 参考:simple_value()

6. insertone 插入一条数据, 返回数据ID

"""

import os

import json

import traceback

import pymysql.cursors

from utils import loggerutils

logger = loggerutils.logger

def find(name, path):

""" 查找文件路径 """

for root, dirs, files in os.walk(path):

if name in files:

return os.path.join(root, name)

def connect_mysql():

""" 创建链接 """

try:

config = find("db_config.json", os.path.abspath("."))

with open(config, "r") as file:

load_dict = json.load(file)

return pymysql.connect(cursorclass=pymysql.cursors.DictCursor, **load_dict)

except Exception as e:

logger.error(traceback.format_exc())

logger.error("cannot create mysql connect")

def queryone(sql, param=None):

"""

返回结果集的第一条数据

:param sql: sql语句

:param param: string|tuple|list

:return: 字典列表 [{}]

"""

con = connect_mysql()

cur = con.cursor()

row = None

try:

cur.execute(sql, param)

row = cur.fetchone()

except Exception as e:

con.rollback()

logger.error(traceback.format_exc())

logger.error("[sql]:{} [param]:{}".format(sql, param))

cur.close()

con.close()

return simple_value(row)

def queryall(sql, param=None):

"""

返回所有查询到的内容 (分页要在sql里写好)

:param sql: sql语句

:param param: tuple|list

:return: 字典列表 [{},{},{}...] or [,,,]

"""

con = connect_mysql()

cur = con.cursor()

rows = None

try:

cur.execute(sql, param)

rows = cur.fetchall()

except Exception as e:

con.rollback()

logger.error(traceback.format_exc())

logger.error("[sql]:{} [param]:{}".format(sql, param))

cur.close()

con.close()

return simple_list(rows)

def insertmany(sql, arrays=None):

"""

批量插入数据

:param sql: sql语句

:param arrays: list|tuple [(),(),()...]

:return: 入库数量

"""

con = connect_mysql()

cur = con.cursor()

cnt = 0

try:

cnt = cur.executemany(sql, arrays)

con.commit()

except Exception as e:

con.rollback()

logger.error(traceback.format_exc())

logger.error("[sql]:{} [param]:{}".format(sql, arrays))

cur.close()

con.close()

return cnt

def insertone(sql, param=None):

"""

插入一条数据

:param sql: sql语句

:param param: string|tuple

:return: id

"""

con = connect_mysql()

cur = con.cursor()

lastrowid = 0

try:

cur.execute(sql, param)

con.commit()

lastrowid = cur.lastrowid

except Exception as e:

con.rollback()

logger.error(traceback.format_exc())

logger.error("[sql]:{} [param]:{}".format(sql, param))

cur.close()

con.close()

return lastrowid

def execute(sql, param=None):

"""

执行sql语句:修改或删除

:param sql: sql语句

:param param: string|list

:return: 影响数量

"""

con = connect_mysql()

cur = con.cursor()

cnt = 0

try:

cnt = cur.execute(sql, param)

con.commit()

except Exception as e:

con.rollback()

logger.error(traceback.format_exc())

logger.error("[sql]:{} [param]:{}".format(sql, param))

cur.close()

con.close()

return cnt

def simple_list(rows):

"""

结果集只有一列的情况, 直接使用数据返回

:param rows: [{'id': 1}, {'id': 2}, {'id': 3}]

:return: [1, 2, 3]

"""

if not rows:

return rows

if len(rows[0].keys()) == 1:

simple_list = []

# print(rows[0].keys()) key = list(rows[0].keys())[0]

for row in rows:

simple_list.append(row[key])

return simple_list

return rows

def simple_value(row):

"""

结果集只有一行, 一列的情况, 直接返回数据

:param row: {'count(*)': 3}

:return: 3

"""

if not row:

return None

if len(row.keys()) == 1:

# print(row.keys()) key = list(row.keys())[0]

return row[key]

return row

if __name__ == '__main__':

print("hello everyone!!!")

# print("删表:", execute('drop table test_users'))

sql = '''

CREATE TABLE `test_users` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`email` varchar(255) NOT NULL,

`password` varchar(255) NOT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='测试用的, 可以直接删除';

'''

print("建表:", execute(sql))

# 批量插入 sql_str = "insert into test_users(email, password) values (%s, %s)"

arrays = [

("aaa@126.com", "111111"),

("bbb@126.com", "222222"),

("ccc@126.com", "333333"),

("ddd@126.com", "444444")

]

print("插入数据:", insertmany(sql_str, arrays))

# 查询 print("只取一行:", queryone("select * from test_users limit %s,%s", (0, 1))) #尽量使用limit print("查询全表:", queryall("select * from test_users"))

# 条件查询 print("一列:", queryall("select email from test_users where id <= %s", 2))

print("多列:", queryall("select * from test_users where email = %s and password = %s", ("bbb@126.com", "222222")))

# 更新|删除 print("更新:", execute("update test_users set email = %s where id = %s", ('new@126.com', 1)))

print("删除:", execute("delete from test_users where id = %s", 4))

# 查询 print("再次查询全表:", queryall("select * from test_users"))

print("数据总数:", queryone("select count(*) from test_users"))

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