python3衔接mysql,Python3衔接MySQL数据库的具体教程

To connect to a MySQL database using Python, you can use the `mysql.connector` module. Here's a stepbystep guide:

1. Install the mysqlconnectorpython package: If you haven't already installed the `mysqlconnectorpython` package, you can do so using pip: ``` pip install mysqlconnectorpython ```

2. Establish a connection: Use the `connect` method from the `mysql.connector` module to establish a connection to the MySQL database. You'll need to provide the following parameters: `host`: The hostname or IP address of the MySQL server. `user`: The username for the MySQL database. `password`: The password for the MySQL database. `database`: The name of the database you want to connect to.

3. Create a cursor object: After establishing the connection, create a cursor object using the `cursor` method. The cursor object is used to execute SQL queries and fetch data from the database.

4. Execute a query: Use the `execute` method of the cursor object to execute an SQL query. For example, to select all rows from a table named `your_table`, you can use: ```python cursor.execute ```

5. Fetch data: Use the `fetchall` method to fetch all the rows returned by the query. This method returns a list of tuples, where each tuple represents a row in the table.

6. Close the cursor and connection: It's important to close the cursor and connection when you're done working with the database to free up resources. Use the `close` method to close the cursor and connection objects.

Here's a complete example that demonstrates how to connect to a MySQL database, execute a query, and fetch the results:

```pythonimport mysql.connector

Establish a connection to the MySQL databaseconn = mysql.connector.connect

Create a cursor object using the cursor methodcursor = conn.cursor

Execute a querycursor.execute

Fetch all the rows in a list of lists.results = cursor.fetchallfor row in results: print

Close the cursor and connectioncursor.closeconn.close```

Make sure to replace `yourusername`, `yourpassword`, `yourdatabase`, and `your_table` with your actual MySQL credentials and table name.

Python3衔接MySQL数据库的具体教程

跟着Python3的遍及，越来越多的开发者开端运用Python3进行数据库操作。MySQL作为一款盛行的开源数据库，与Python3的结合运用也日益频繁。本文将具体介绍怎么运用Python3衔接MySQL数据库，包含装置必要的库、装备数据库衔接以及履行根本的数据库操作。

一、准备工作

在开端之前，请保证您的电脑上已装置以下软件：

Python3：能够从Python官方网站下载并装置。

MySQL：能够从MySQL官方网站下载并装置。

PyMySQL：Python衔接MySQL的库，用于树立数据库衔接。

二、装置PyMySQL库

PyMySQL是Python衔接MySQL的库，能够经过pip指令进行装置。在指令行中输入以下指令：

pip3 install PyMySQL

装置完成后，您能够经过以下指令查看PyMySQL是否装置成功：

import pymysql

print(pymysql.__version__)

假如输出版本号，则表明PyMySQL已成功装置。

三、装备MySQL数据库

在衔接MySQL数据库之前，您需求保证MySQL数据库已装置并装备好。以下是装备MySQL数据库的过程：

翻开MySQL指令行东西。

输入以下指令创立一个新的数据库：

CREATE DATABASE test;

挑选该数据库：

USE test;

创立一个新用户并授权：

CREATE USER 'username'@'localhost' IDENTIFIED BY 'password';

GRANT ALL PRIVILEGES ON test. TO 'username'@'localhost';

FLUSH PRIVILEGES;

四、衔接MySQL数据库

在Python代码中，您能够运用以下代码衔接MySQL数据库：

import pymysql

数据库装备信息

config = {

'host': 'localhost',

'port': 3306,

'user': 'username',

'password': 'password',

'db': 'test',

'charset': 'utf8mb4',

'cursorclass': pymysql.cursors.DictCursor

树立数据库衔接

conn = pymysql.connect(config)

创立游标目标

cursor = conn.cursor()

履行SQL句子

cursor.execute(\