如何连接到 Python 中的 MySQL 数据库？

Question

How do I connect to a MySQL database using a python program?

Answer 1

Connecting to MYSQL with Python 2 in three steps

1 - Setting

You must install a MySQL driver before doing anything. Unlike PHP, Only the SQLite driver is installed by default with Python. The most used package to do so is MySQLdb but it's hard to install it using easy_install. Please note MySQLdb only supports Python 2.

For Windows user, you can get an exe of MySQLdb .

For Linux, this is a casual package (python-mysqldb). (You can use sudo apt-get install python-mysqldb (for debian based distros), yum install MySQL-python (for rpm-based), or dnf install python-mysql (for modern fedora distro) in command line to download.)

For Mac, you can install MySQLdb using Macport .

2 - Usage

After installing, Reboot. This is not mandatory, But it will prevent me from answering 3 or 4 other questions in this post if something goes wrong. So please reboot.

Then it is just like using any other package :

#!/usr/bin/python
import MySQLdb

db = MySQLdb.connect(host="localhost",    # your host, usually localhost
                     user="john",         # your username
                     passwd="megajonhy",  # your password
                     db="jonhydb")        # name of the data base

# you must create a Cursor object. It will let
#  you execute all the queries you need
cur = db.cursor()

# Use all the SQL you like
cur.execute("SELECT * FROM YOUR_TABLE_NAME")

# print all the first cell of all the rows
for row in cur.fetchall():
    print row[0]

db.close()

Of course, there are thousand of possibilities and options; this is a very basic example. You will have to look at the documentation. A good starting point .

3 - More advanced usage

Once you know how it works, You may want to use an ORM to avoid writing SQL manually and manipulate your tables as they were Python objects. The most famous ORM in the Python community is SQLAlchemy .

I strongly advise you to use it: your life is going to be much easier.

I recently discovered another jewel in the Python world: peewee . It's a very lite ORM, really easy and fast to setup then use. It makes my day for small projects or stand alone apps, Where using big tools like SQLAlchemy or Django is overkill :

import peewee
from peewee import *

db = MySQLDatabase('jonhydb', user='john', passwd='megajonhy')

class Book(peewee.Model):
    author = peewee.CharField()
    title = peewee.TextField()

    class Meta:
        database = db

Book.create_table()
book = Book(author="me", title='Peewee is cool')
book.save()
for book in Book.filter(author="me"):
    print book.title

This example works out of the box. Nothing other than having peewee ( pip install peewee ) is required.

Answer 2

Here's one way to do it, using MySQLdb , which only supports Python 2:

#!/usr/bin/python
import MySQLdb

# Connect
db = MySQLdb.connect(host="localhost",
                     user="appuser",
                     passwd="",
                     db="onco")

cursor = db.cursor()

# Execute SQL select statement
cursor.execute("SELECT * FROM location")

# Commit your changes if writing
# In this case, we are only reading data
# db.commit()

# Get the number of rows in the resultset
numrows = cursor.rowcount

# Get and display one row at a time
for x in range(0, numrows):
    row = cursor.fetchone()
    print row[0], "-->", row[1]

# Close the connection
db.close()

Reference here

Answer 3

If you do not need MySQLdb, but would accept any library, I would very, very much recommend MySQL Connector/Python from MySQL: http://dev.mysql.com/downloads/connector/python/ .

It is one package (around 110k), pure Python, so it is system independent, and dead simple to install. You just download, double-click, confirm license agreement and go. There is no need for Xcode, MacPorts, compiling, restarting …

Then you connect like:

import mysql.connector    
cnx = mysql.connector.connect(user='scott', password='tiger',
                              host='127.0.0.1',
                              database='employees')

try:
   cursor = cnx.cursor()
   cursor.execute("""
      select 3 from your_table
   """)
   result = cursor.fetchall()
   print result
finally:
    cnx.close()

Answer 4

Oracle (MySQL) now supports a pure Python connector. That means no binaries to install: it's just a Python library. It's called "Connector/Python".

http://dev.mysql.com/downloads/connector/python/

After installations, you can see some usage examples here

Answer 5

Stop Using MySQLDb if you want to avoid installing mysql headers just to access mysql from python.

Use pymysql . It does all of what MySQLDb does, but it was implemented purely in Python with NO External Dependencies . This makes the installation process on all operating systems consistent and easy. pymysql is a drop in replacement for MySQLDb and IMHO there is no reason to ever use MySQLDb for anything... EVER! - PTSD from installing MySQLDb on Mac OSX and *Nix systems , but that's just me.

Installation

pip install pymysql

That's it... you are ready to play.

Example usage from pymysql Github repo

import pymysql.cursors
import pymysql

# Connect to the database
connection = pymysql.connect(host='localhost',
                             user='user',
                             password='passwd',
                             db='db',
                             charset='utf8mb4',
                             cursorclass=pymysql.cursors.DictCursor)

try:
    with connection.cursor() as cursor:
        # Create a new record
        sql = "INSERT INTO `users` (`email`, `password`) VALUES (%s, %s)"
        cursor.execute(sql, ('webmaster@python.org', 'very-secret'))

    # connection is not autocommit by default. So you must commit to save
    # your changes.
    connection.commit()

    with connection.cursor() as cursor:
        # Read a single record
        sql = "SELECT `id`, `password` FROM `users` WHERE `email`=%s"
        cursor.execute(sql, ('webmaster@python.org',))
        result = cursor.fetchone()
        print(result)
finally:
    connection.close()

ALSO - Replace MySQLdb in existing code quickly and transparently

If you have existing code that uses MySQLdb, you can easily replace it with pymysql using this simple process:

# import MySQLdb << Remove this line and replace with:
import pymysql
pymysql.install_as_MySQLdb()

All subsequent references to MySQLdb will use pymysql transparently.

Answer 6

Try using MySQLdb . MySQLdb only supports Python 2.

There is a how to page here: http://www.kitebird.com/articles/pydbapi.html

---

From the page:

# server_version.py - retrieve and display database server version

import MySQLdb

conn = MySQLdb.connect (host = "localhost",
                        user = "testuser",
                        passwd = "testpass",
                        db = "test")
cursor = conn.cursor ()
cursor.execute ("SELECT VERSION()")
row = cursor.fetchone ()
print "server version:", row[0]
cursor.close ()
conn.close ()

Answer 7

As a db driver, there is also oursql . Some of the reasons listed on that link, which say why oursql is better:

• oursql has real parameterization, sending the SQL and data to MySQL completely separately.
• oursql allows text or binary data to be streamed into the database and streamed out of the database, instead of requiring everything to be buffered in the client.
• oursql can both insert rows lazily and fetch rows lazily.
• oursql has unicode support on by default.
• oursql supports python 2.4 through 2.7 without any deprecation warnings on 2.6+ (see PEP 218) and without completely failing on 2.7 (see PEP 328).
• oursql runs natively on python 3.x.

So how to connect to mysql with oursql?

Very similar to mysqldb:

import oursql

db_connection = oursql.connect(host='127.0.0.1',user='foo',passwd='foobar',db='db_name')
cur=db_connection.cursor()
cur.execute("SELECT * FROM `tbl_name`")
for row in cur.fetchall():
    print row[0]

The tutorial in the documentation is pretty decent.

And of course for ORM SQLAlchemy is a good choice, as already mentioned in the other answers.

Answer 8

Run this command in your terminal to install mysql connector:

pip install mysql-connector-python

And run this in your python editor to connect to MySQL:

import mysql.connector

mydb = mysql.connector.connect(
      host="localhost",
      user="yusername",
      passwd="password",
      database="database_name"
)

Samples to execute MySQL Commands (in your python edior):

mycursor = mydb.cursor()
mycursor.execute("CREATE TABLE customers (name VARCHAR(255), address VARCHAR(255))")    
mycursor.execute("SHOW TABLES")

mycursor.execute("INSERT INTO customers (name, address) VALUES ('John', 'Highway 21')")    
mydb.commit() # Use this command after insert or update

For more commands: https://www.w3schools.com/python/python_mysql_getstarted.asp

Answer 9

SqlAlchemy

---

SQLAlchemy is the Python SQL toolkit and Object Relational Mapper that gives application developers the full power and flexibility of SQL. SQLAlchemy provides a full suite of well known enterprise-level persistence patterns, designed for efficient and high-performing database access, adapted into a simple and Pythonic domain language.

Installation

pip install sqlalchemy

RAW query

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, scoped_session

engine = create_engine("mysql://<user_name>:<password>@<host_name>/<db_name>")
session_obj = sessionmaker(bind=engine)
session = scoped_session(session_obj)

# insert into database
session.execute("insert into person values(2, 'random_name')")
session.flush()
session.commit()

ORM way

from sqlalchemy import Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, scoped_session

Base = declarative_base()
engine = create_engine("mysql://<user_name>:<password>@<host_name>/<db_name>")
session_obj = sessionmaker(bind=engine)
session = scoped_session(session_obj)

# Bind the engine to the metadata of the Base class so that the
# declaratives can be accessed through a DBSession instance
Base.metadata.bind = engine

class Person(Base):
    __tablename__ = 'person'
    # Here we define columns for the table person
    # Notice that each column is also a normal Python instance attribute.
    id = Column(Integer, primary_key=True)
    name = Column(String(250), nullable=False)

# insert into database
person_obj = Person(id=12, name="name")
session.add(person_obj)
session.flush()
session.commit()

Answer 10

Despite all answers above, in case you do not want to connect to a specific database upfront, for example, if you want to create the database still (!), you can use connection.select_db(database) , as demonstrated in the following.

import pymysql.cursors
connection = pymysql.connect(host='localhost',
                         user='mahdi',
                         password='mahdi',
                         charset='utf8mb4',
                         cursorclass=pymysql.cursors.DictCursor)
cursor = connection.cursor()
cursor.execute("CREATE DATABASE IF NOT EXISTS "+database)
connection.select_db(database)
sql_create = "CREATE TABLE IF NOT EXISTS "+tablename+(timestamp DATETIME NOT NULL PRIMARY KEY)"
cursor.execute(sql_create)
connection.commit()
cursor.close()

Answer 11

Best way to connect to MySQL from python is to Use MySQL Connector/Python because it is official Oracle driver for MySQL for working with Python and it works with both Python 3 and Python 2.

follow the steps mentioned below to connect MySQL

1. install connector using pip

   pip install mysql-connector-python

or you can download the installer from https://dev.mysql.com/downloads/connector/python/

2. Use connect() method of mysql connector python to connect to MySQL.pass the required argument to connect() method. ie Host, username, password, and database name.

3. Create cursor object from connection object returned by connect() method to execute SQL queries.

4. close the connection after your work completes.

Example :

import mysql.connector
 from mysql.connector import Error
 try:
     conn = mysql.connector.connect(host='hostname',
                         database='db',
                         user='root',
                         password='passcode')
     if conn.is_connected():
       cursor = conn.cursor()
       cursor.execute("select database();")
       record = cursor.fetchall()
       print ("You're connected to - ", record)
 except Error as e :
    print ("Print your error msg", e)
 finally:
    #closing database connection.
    if(conn.is_connected()):
       cursor.close()
       conn.close()

Reference - https://pynative.com/python-mysql-database-connection/

Important API of MySQL Connector Python

• For DML operations - Use cursor.execute() and cursor.executemany() to run query. and after this use connection.commit() to persist your changes to DB

• To fetch data - Use cursor.execute() to run query and cursor.fetchall() , cursor.fetchone() , cursor.fetchmany(SIZE) to fetch data

Answer 12

Even though some of you may mark this as a duplicate and get upset that I am copying someone else's answer, I would REALLY like to highlight an aspect of Mr. Napik's response. Because I missed this, I caused nationwide website downtime (9min). If only someone shared this information, I could have prevented it!

Here is his code:

import mysql.connector    
cnx = mysql.connector.connect(user='scott', password='tiger',
                              host='127.0.0.1',
                              database='employees')
try:
   cursor = cnx.cursor()
   cursor.execute("""select 3 from your_table""")
   result = cursor.fetchall()
   print(result)
finally:
    cnx.close()

The important thing here is the Try and Finally clause. This allows connections to ALWAYS be closed, regardless of what happens in the cursor/sqlstatement portion of the code. A lot of active connections cause DBLoadNoCPU to spike and could crash a db server.

I hope this warning helps to save servers and ultimately jobs! :D

Answer 13

MySQLdb is the straightforward way. You get to execute SQL queries over a connection. Period.

My preferred way, which is also pythonic, is to use the mighty SQLAlchemy instead. Here is a query related tutorial, and here is a tutorial on ORM capabilities of SQLALchemy.

Answer 14

for Python3.6 I found two driver: pymysql and mysqlclient. I tested the performance between them and got the result: the mysqlclient is faster.

below is my test process(need install python lib profilehooks to analyze time elapse：

raw sql: select * from FOO;

immediatly execute in mysql terminal: 46410 rows in set (0.10 sec)

pymysql (2.4s):

from profilehooks import profile
import pymysql.cursors
import pymysql
connection = pymysql.connect(host='localhost', user='root', db='foo')
c = connection.cursor()

@profile(immediate=True)
def read_by_pymysql():
    c.execute("select * from FOO;")
    res = c.fetchall()

read_by_pymysql()

here's the pymysql profile:

mysqlclient (0.4s)

from profilehooks import profile
import MySQLdb

connection = MySQLdb.connect(host='localhost', user='root', db='foo')
c = connection.cursor()

@profile(immediate=True)
def read_by_mysqlclient():
    c.execute("select * from FOO;")
    res = c.fetchall()

read_by_mysqlclient()

here's the mysqlclient profile:

So, it seems that mysqlclient is much faster than pymysql

Answer 15

Just a modification in above answer. Simply run this command to install mysql for python

sudo yum install MySQL-python
sudo apt-get install MySQL-python

remember! It is case sensitive.

Answer 16

mysqlclient is the best as others only provide support to specific versions of python

 pip install mysqlclient

example code

    import mysql.connector
    import _mysql
    db=_mysql.connect("127.0.0.1","root","umer","sys")
    #db=_mysql.connect(host,user,password,db)
    # Example of how to insert new values:
    db.query("""INSERT INTO table1 VALUES ('01', 'myname')""")
    db.store_result()
    db.query("SELECT * FROM new1.table1 ;") 
    #new1 is scheme table1 is table mysql 
    res= db.store_result()
    for i in range(res.num_rows()):
        print(result.fetch_row())

see https://github.com/PyMySQL/mysqlclient-python

Answer 17

Also take a look at Storm . It is a simple SQL mapping tool which allows you to easily edit and create SQL entries without writing the queries.

Here is a simple example:

from storm.locals import *

# User will be the mapped object; you have to create the table before mapping it
class User(object):
        __storm_table__ = "user" # table name
        ID = Int(primary=True) #field ID
        name= Unicode() # field name

database = create_database("mysql://root:password@localhost:3306/databaseName")
store = Store(database)

user = User()
user.name = u"Mark"

print str(user.ID) # None

store.add(user)  
store.flush() # ID is AUTO_INCREMENT

print str(user.ID) # 1 (ID)

store.commit() # commit all changes to the database

To find and object use:

michael = store.find(User, User.name == u"Michael").one()
print str(user.ID) # 10

Find with primary key:

print store.get(User, 1).name #Mark

For further information see the tutorial .

Answer 18

This is Mysql DB connection

from flask import Flask, render_template, request
from flask_mysqldb import MySQL

app = Flask(__name__)


app.config['MYSQL_HOST'] = 'localhost'
app.config['MYSQL_USER'] = 'root'
app.config['MYSQL_PASSWORD'] = 'root'
app.config['MYSQL_DB'] = 'MyDB'

mysql = MySQL(app)


@app.route('/', methods=['GET', 'POST']) 
def index():
    if request.method == "POST":
        details = request.form
        cur = mysql.connection.cursor()
        cur.execute ("_Your query_")
        mysql.connection.commit()
        cur.close()
        return 'success'
    return render_template('index.html')


if __name__ == '__main__':
    app.run()

Answer 19

you can connect your python code to mysql in this way.

import MySQLdb
db = MySQLdb.connect(host="localhost",
                 user="appuser",
                 passwd="",
                 db="onco")

cursor = db.cursor()

Answer 20

PyMySQL 0.10.1 - Released: Sep 10, 2020, has support for python3 as well.

python3 -m pip install PyMySQL

Simple code:

import pymysql

# Connect to the database
conn = pymysql.connect(host='127.0.0.1',user='root',passwd='root',db='fax')

# Create a Cursor object
cur = conn.cursor()

# Execute the query
cur.execute("SELECT * FROM fax.student")

# Read and print records
for row in cur.fetchall():
    print(row)

output:

(1, 'Petar', 'Petrovic', 1813, 'Njegusi')
(2, 'Donald', 'Tramp', 1946, 'New York')
(3, 'Bill', 'Gates', 1955, 'Seattle')

Answer 21

For python 3.3

CyMySQL https://github.com/nakagami/CyMySQL

I have pip installed on my windows 7, just pip install cymysql

(you don't need cython) quick and painless

Answer 22

first install the driver

pip install MySQL-python   

Then a basic code goes like this:

#!/usr/bin/python
import MySQLdb

try:
    db = MySQLdb.connect(host="localhost",      # db server, can be a remote one 
                     db="mydb"                  # database
                     user="mydb",               # username
                     passwd="mydb123",          # password for this username
                     )        

    # Create a Cursor object
    cur = db.cursor()

    # Create a query string. It can contain variables
    query_string = "SELECT * FROM MY_TABLE"

    # Execute the query
    cur.execute(query_string)

    # Get all the rows present the database
    for each_row in cur.fetchall():
        print each_row

    # Close the connection
    db.close()
except Exception, e:
    print 'Error ', e 

Answer 23

First install the driver (Ubuntu)

• sudo apt-get install python-pip

• sudo pip install -U pip

• sudo apt-get install python-dev libmysqlclient-dev

• sudo apt-get install MySQL-python

MySQL database connection codes

import MySQLdb
conn = MySQLdb.connect (host = "localhost",user = "root",passwd = "pass",db = "dbname")
cursor = conn.cursor ()
cursor.execute ("SELECT VERSION()")
row = cursor.fetchone ()
print "server version:", row[0]
cursor.close ()
conn.close ()

Answer 24

First step to get The Library: Open terminal and execute pip install mysql-python-connector . After the installation go the second step.

Second Step to import the library: Open your python file and write the following code: import mysql.connector

Third step to connect to the server: Write the following code:

conn = mysql.connector.connect(host= you host name like localhost or 127.0.0.1 , username= your username like root , password = your password )

Third step Making the cursor: Making a cursor makes it easy for us to run queries. To make the cursor use the following code: cursor = conn.cursor()

Executing queries: For executing queries you can do the following: cursor.execute(query)

If the query changes any thing in the table you need to add the following code after the execution of the query: conn.commit()

Getting values from a query: If you want to get values from a query then you can do the following: cursor.excecute('SELECT * FROM table_name ') for i in cursor: print(i) #Or for i in cursor.fetchall(): print(i)

The fetchall() method returns a list with many tuples that contain the values that you requested ,row after row .

Closing the connection: To close the connection you should use the following code: conn.close()

Handling exception: To Handel exception you can do it Vai the following method: try: #Logic pass except mysql.connector.errors.Error: #Logic pass To use a database: For example you are a account creating system where you are storing the data in a database named blabla, you can just add a database parameter to the connect() method ,like

mysql.connector.connect(database = database name )

don't remove other informations like host,username,password.

Answer 25

如何使用python程序连接到MySQL数据库？

Answer 26

如果您只想从数据库中绘制一些数据，另一种选择是使用 Jupyter内核，它是为 MariaDB 设计的，但它也应该很容易在 MySQL 上工作。

Answer 27

Python does not come with an inbuilt Library to interact with MySQL, so in order to make a connection between the MySQL database and Python we need to install the MySQL driver or module for our Python Environment.

pip install mysql-connector-python

the mysql-connecter-python is an open source Python library that can connect your python code to the MySQL data base in a few lines of code. And it is very compatible with the latest version of Python.

After install the mysql-connector-python, you can connect to your MySQL database using the the following code snippet.

import mysql.connector

Hostname = "localhost"
Username = "root"
Password ="admin"   #enter your MySQL password
 
#set connection
set_db_conn = mysql.connector.connect(host= Hostname, user=Username, password=Password)

if set_db_conn:
    print("The Connection between has been set and the Connection ID is:")
    #show connection id
    print(set_db_conn.connection_id)

Connect Django with MySQL

In Django, to connect your model or project to the MySQL data base, you need to install the mysqlclient library.

pip install mysqlclient

And to configure your Django setting so your project can connect to the MySQL database, you can use the following setting.

DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.mysql',
            'NAME': 'database_name',
            'USER': 'username',
            'PASSWORD': 'databasepassword@123',
            'HOST': 'localhost',   # Or an IP Address that your DB is hosted on
            'PORT': '3306',
            }

I have written a dedicated Python tutorial on my blog that covers how you can connect to a MySQL database and create tables using Python. To know more about it, click here .

Answer 28

Here's what I do, if the database doesn't exist yet, it creates for you:

import sqlite3

conn = sqlite3.connect('data.db')
c = conn.cursor()

def create_table():
    c.execute('CREATE TABLE IF NOT EXISTS usersdata(idpedido INTEGER PRIMARY KEY ,cliente TEXT ,telefone TEXT ,prioridade TEXT ,data_entrada DATE ,data_prevista DATE ,horario_entrada TEXT , horario_saida TEXT , status TEXT)')


def add_data(idpedido,cliente,telefone,prioridade,data_entrada,data_prevista,horario_entrada,horario_saida,status):
    c.execute('INSERT INTO usersdata(idpedido,cliente,telefone,prioridade,data_entrada,data_prevista,horario_entrada,horario_saida,status ) VALUES (?,?,?,?,?,?,?,?,?)',(idpedido,cliente,telefone,prioridade,data_entrada,data_prevista,horario_entrada,horario_saida, status))
    conn.commit()

Answer 29

First, install python-mysql connector from https://dev.mysql.com/downloads/connector/python/

on Python console enter:

pip install mysql-connector-python-rf
import mysql.connector