问题描述
这很好用
from sqlalchemy import create_engine
import pandas as pd
db_connection_str = 'MysqL+pyMysqL://User:PW@localhost/dbname'
db_connection = create_engine(db_connection_str)
df = pd.read_sql('SELECT * FROM tablename',con=db_connection)
如果我将localhost替换为IP，则不会
from sqlalchemy import create_engine
import pandas as pd
db_connection_str = 'MysqL+pyMysqL://User:PW@192.168.0.7/dbname'
db_connection = create_engine(db_connection_str)
df = pd.read_sql('SELECT * FROM tablename',con=db_connection)
OperationalError：（pyMysqL.err.OperationalError）（2003年，“无法连接到192.168.0.7上的MysqL服务器（[Errno 111]连接被拒绝）”） （此错误的背景位于：http://sqlalche.me/e/13/e3q8）
但是有必要用IP替换localhost，因为我想从客户端执行脚本。
编辑：在我的/etc/MysqL/my.cnf中没有bind-adddress:-所以我添加了最后一行：
# The MariaDB configuration file
#
# The MariaDB/MysqL tools read configuration files in the following order:
# 1. "/etc/MysqL/mariadb.cnf" (this file) to set global defaults,# 2. "/etc/MysqL/conf.d/*.cnf" to set global options.
# 3. "/etc/MysqL/mariadb.conf.d/*.cnf" to set MariaDB-only options.
# 4. "~/.my.cnf" to set user-specific options.
#
# If the same option is defined multiple times,the last one will apply.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# This group is read both both by the client and the server
# use it for options that affect everything
#
[client-server]
# Import all .cnf files from configuration directory
!includedir /etc/MysqL/conf.d/
!includedir /etc/MysqL/mariadb.conf.d/
bind-address = 0.0.0.0
并执行sudo systemctl restart mariadb
现在我收到新的错误消息：
InternalError：（pyMysqL.err.InternalError）数据包序列号 错误-预期值为1（此错误的背景位于： http://sqlalche.me/e/13/2j85）
解决方法
可以在此处找到 InternalError: Packet sequence number wrong - got 1 expected 0 错误的解决方案：https://github.com/PyMySQL/PyMySQL/issues/971