python 读取mysql数据

1 python读取mysql数据

import pymysql
import pandas as pd
def load_data_from_mysql():
	conn = pymysql.connect(host="127.0.0.1",
	                       port=3306,
	                       user="test",
	                       password="test",
	                       db="database",
	                       charset="utf8")
	cursor = conn.cursor()
	sql = "SELECT * FROM table1"
	cursor.execute(sql)
	result = cursor.fetchall()
	return result
if __name__=="__main__":
	load_data_from_mysql()

2 pandas加载mysql数据

import pymysql
import pandas as pd
def load_data_frame_from_mysql():
    conn = pymysql.connect(host="127.0.0.1",
                           port=3306,
                           user="test",
                           password="test",
                           db="database",
                           charset="utf8")
    sql = "SELECT * FROM table1"
    data_frame = pd.read_sql(sql, conn)
    return data_frame

3 Python通过SSH读取mysql

  在实际应用中，我们可能有使用SSH读取MySQL数据库的情况。由于限制了两台机器之间只能通过私钥连接，所以整个过程的结果如下。

1. 安装 sshtunnel

pip install sshtunnel

2. python代码

with SSHTunnelForwarder(
    ssh_address_or_host=('跳板机地址', 跳板机端口),
    ssh_username='跳板机账户名',
    ssh_pkey='本机id_rsa地址',
    remote_bind_address=('远程数据库地址', 数据库端口)
) as tunnel:
    conn = pymysql.connect(host="127.0.0.1", //必须是127.0.0.1
                           port=server.local_bind_port,
                           user="数据库用户名",
                           password="数据库密码",
                           db="数据库")
    
    cursor = conn.cursor()
    sql = "SELECT * FROM 表名"
    cursor.execute(sql)
    result = cursor.fetchall()
    print(result)