python 連接MySQL

1.安裝MySQL

進入cmd,輸入pip install PyMySQL，回車即可安裝，我用的是python3

2.導入pymysql模塊

在pycharm中輸入import pymysql，如果安裝之后仍然不能導入，

就在setting中手動安裝PyMySQL，setting安裝步驟請參考https://www.cnblogs.com/keqing1108/p/11936633.html

3.連接數據庫

import pymysql

def conn_mysql():
    conn = pymysql.connect(host='localhost', port=2020, user='username', password='password', db='db_name', charset='utf8')
    cur = conn.cursor()
    cur.execute('select * from TB_Name')
    result = cur.fetchall()
    cur.close()
    conn.close()
    print(result)

if __name__ == '__main__':
    conn_mysql()

備注：port必須為int型，否則會報錯：TypeError: %d format: a number is required, not str
　　　charset的值為utf8,不是utf-8，
     否則會報錯：AttributeError: 'NoneType' object has no attribute 'encoding'