How to insert pandas dataframe via mysqldb into database

Question

I can connect to my local mysql database from python  and I can create  select from  and insert individual rows   My question is  can I directly instruct mysqldb to take an entire dataframe and insert it into an existing table  or do I need to iterate over the rows    In either case  what would the python script look like for a very simple table with ID and two data columns  and a matching dataframe

User · Answer

This should do the trick  import pandas as pd import pymysql pymysql install as MySQLdb   from sqlalchemy import create engine    Create engine engine   create engine  mysql   USER NAME HERE PASS HERE HOST ADRESS HERE DB NAME HERE      Create the connection and close it whether successed of failed  with engine begin   as connection    df to sql name  INSERT TABLE NAME HERE INSERT NEW TABLE NAME   con connection  if exists  append   index False

User · Answer

You can  do it by using pymysql   For example  let s suppose you have a MySQL database with the next user  password  host and port and you want to write in the database  data 2   if it is already there or not   import pymysql user    root  passw    my-secret-pw-for-mysql-12ud  host     172 17 0 2  port   3306 database    data 2    If you already have the database created   conn   pymysql connect host host                         port port                         user user                          passwd passw                           db database                         charset  utf8    data to sql name database  con conn  if exists    replace   index False  flavor    mysql     If you do NOT have the database created  also valid when the database is already there   conn   pymysql connect host host  port port  user user  passwd passw   conn cursor   execute  CREATE DATABASE IF NOT EXISTS  0    format database   conn   pymysql connect host host                         port port                         user user                          passwd passw                           db database                         charset  utf8    data to sql name database  con conn  if exists    replace   index False  flavor    mysql     Similar threads    Writing to MySQL database with pandas using SQLAlchemy  to sql   Writing a Pandas Dataframe to MySQL

User · Answer

Python 2   3  Prerequesites   Pandas MySQL server sqlalchemy pymysql  pure python mysql client   Code  from pandas io import sql from sqlalchemy import create engine  engine   create engine  mysql pymysql    user   pw  localhost  db                           format user  root                                  pw  your password                                  db  pandas    df to sql con engine  name  table name   if exists  replace

User · Answer

You might output your DataFrame as a csv file and then use mysqlimport to import your csv into your mysql   EDIT  Seems pandas s build-in sql util provide a write frame function but only works in sqlite   I found something useful  you might try this

User · Answer

The to sql method works for me   However  keep in mind that the it looks like it s going to be deprecated in favor of SQLAlchemy   FutureWarning  The  mysql  flavor with DBAPI connection is deprecated and will be removed in future versions  MySQL will be further supported with SQLAlchemy connectables  chunksize chunksize  dtype dtype

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df to sql name    owner   con  db connection  schema    aws   if exists  replace   index    True  index label  id

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Update   There is now a to sql method  which is the preferred way to do this  rather than write frame   df to sql con con  name  table name for df   if exists  replace   flavor  mysql     Also note  the syntax may change in pandas 0 14     You can set up the connection with MySQLdb   from pandas io import sql import MySQLdb  con   MySQLdb connect      may need to add some other options to connect   Setting the flavor of write frame to  mysql  means you can write to mysql   sql write frame df  con con  name  table name for df                    if exists  replace   flavor  mysql     The argument if exists tells pandas how to deal if the table already exists      if exists    fail    replace    append    default  fail         nbsp  nbsp  nbsp  nbsp  fail  If table exists  do nothing         nbsp  nbsp  nbsp  nbsp  replace  If table exists  drop it  recreate it  and insert data         nbsp  nbsp  nbsp  nbsp  append  If table exists  insert data  Create if does not exist    Although the write frame docs currently suggest it only works on sqlite  mysql appears to be supported and in fact there is quite a bit of mysql testing in the codebase

User · Answer

Andy Hayden mentioned the correct function  to sql   In this answer  I ll give a complete example  which I tested with Python 3 5 but should also work for Python 2 7  and Python 3 x    First   let s create the dataframe     Create dataframe import pandas as pd import numpy as np  np random seed 0  number of samples   10 frame   pd DataFrame        feature1   np random random number of samples        feature2   np random random number of samples        class      np random binomial 2  0 1  size number of samples         columns   feature1   feature2   class     print frame    Which gives      feature1  feature2  class 0  0 548814  0 791725      1 1  0 715189  0 528895      0 2  0 602763  0 568045      0 3  0 544883  0 925597      0 4  0 423655  0 071036      0 5  0 645894  0 087129      0 6  0 437587  0 020218      0 7  0 891773  0 832620      1 8  0 963663  0 778157      0 9  0 383442  0 870012      0   To import this dataframe into a MySQL table     Import dataframe into MySQL import sqlalchemy database username    ENTER USERNAME  database password    ENTER USERNAME PASSWORD  database ip          ENTER DATABASE IP  database name        ENTER DATABASE NAME  database connection   sqlalchemy create engine  mysql mysqlconnector    0   1   2   3                                                   format database username  database password                                                         database ip  database name   frame to sql con database connection  name  table name for df   if exists  replace     One trick is that MySQLdb doesn t work with Python 3 x  So instead we use mysqlconnector  which may be installed as follows   pip install mysql-connector  2 1 4    version avoids Protobuf error   Output     Note that to sql creates the table as well as the columns if they do not already exist in the database

User · Answer

This has worked for me  At first I ve created only the database  no predefined table I created  from platform import python version print python version    3 7 3  path  glass data  df pd read csv path  df head      conda install sqlalchemy  conda install pymysql  pd   version        0 24 2   sqlalchemy   version    1 3 20   restarted the Kernel after installation  from sqlalchemy import create engine engine   create engine  mysql pymysql   USER PASSWORD HOST PORT DATABASE NAME   echo False   try  df to sql name  glasstable  con engine index False  if exists  replace   print  Sucessfully written to Database       except Exception as e      print e

[python] How to insert pandas dataframe via mysqldb into database?

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