python模块-pymysql源码分析及其常见使用

D:\soft\python36\Lib\site-packages\pymysql>tree /f
卷 新加卷 的文件夹 PATH 列表
卷序列号为 960E-961E
D:.
│  charset.py
│  connections.py
│  converters.py
│  cursors.py
│  err.py
│  optionfile.py
│  protocol.py
│  times.py
│  util.py
│  _auth.py
│  _compat.py
│  _socketio.py
│  __init__.py
│
├─constants
│  │  CLIENT.py
│  │  COMMAND.py
│  │  CR.py
│  │  ER.py
│  │  FIELD_TYPE.py
│  │  FLAG.py
│  │  SERVER_STATUS.py
│  │  __init__.py
│  │
│  └─__pycache__
│          CLIENT.cpython-36.pyc
│          COMMAND.cpython-36.pyc
│          CR.cpython-36.pyc
│          ER.cpython-36.pyc
│          FIELD_TYPE.cpython-36.pyc
│          FLAG.cpython-36.pyc
│          SERVER_STATUS.cpython-36.pyc
│          __init__.cpython-36.pyc
│
└─__pycache__
        charset.cpython-36.pyc
        connections.cpython-36.pyc
        converters.cpython-36.pyc
        cursors.cpython-36.pyc
        err.cpython-36.pyc
        optionfile.cpython-36.pyc
        protocol.cpython-36.pyc
        times.cpython-36.pyc
        util.cpython-36.pyc
        _auth.cpython-36.pyc
        _compat.cpython-36.pyc
        _socketio.cpython-36.pyc
        __init__.cpython-36.pyc
pymysql源码目录结构

 

# -*- coding: utf-8 -*-
# @Time : 2019/8/14 10:38
# @Author : wangmengmeng
import pymysql
from config.cfg import *


class ConnectDB:
    def __init__(self):
        print('start connecting MySQL...')
        try:
            self.host = host
            self.port = int(port)
            self.username = user_name
            self.password = pwd
            self.db_sf_full = db_auditcenter
        except Exception as e:
            print(e)
        else:
            print("数据库连接成功!")

    def connect(self):
        return pymysql.Connect(host=self.host, port=self.port, user=self.username, passwd=self.password,
                               database=self.db_sf_full, charset='utf8')



if __name__ == '__main__':
    con = ConnectDB()
    # cur = con.connect().cursor() # 返回格式为 元组里嵌套元组
    """
    如:((1002, '3', 'wangmm', '王萌萌', '122', '122', 0, datetime.datetime(2020, 3, 9, 14, 28, 18), None), (12002, '3', 'wangmm', '王萌萌', 'vvv', 'vvv', 0, datetime.datetime(2020, 3, 13, 13, 43, 11), None))
    """
    cur = con.connect().cursor(pymysql.cursors.DictCursor) # 返回格式为 列表里嵌套字典
    """
    如:[{'id': 1002, 'pharmacist_id': '3', 'pharmacist_name': 'wangmm', 'pharmacist_realname': '王萌萌', 'tag': '122', 'tag_py': '122', 'default_flag': 0, 'created_time': datetime.datetime(2020, 3, 9, 14, 28, 18), 'modified_time': None}, {'id': 12002, 'pharmacist_id': '3', 'pharmacist_name': 'wangmm', 'pharmacist_realname': '王萌萌', 'tag': 'vvv', 'tag_py': 'vvv', 'default_flag': 0, 'created_time': datetime.datetime(2020, 3, 13, 13, 43, 11), 'modified_time': None}]
    """
    cur.execute('SELECT * FROM `sf_collect_tag`')
    # print(cur.fetchone())  # 查询一条数据,返回一维元组,若查询结果集有多条,则只会取最上面一条,若没有结果则返回None
    # print(cur.fetchall())  # 查询多条数据,返回二维元组,若没有结果则返回()
    print(cur.fetchmany(2))  # 查询指定条数据

 

posted @ 2020-03-13 11:18  爱打盹的猫猫  阅读(911)  评论(0编辑  收藏  举报