Python 使用mysql-connector连接数据库实现基本的CRUD操作

1.引入依赖库

版本：mysql 5.7

pip install mysql-connector

2.连接操作

import mysql.connector
from mysql.connector import errorcode 
## 连接数据库

## 第一种连接方式
mysql_db = mysql.connector.connect(
  host="192.168.10.222", # 数据库主机地址
  port=3306, #端口号
  database="test", # 数据库
  user="root", # 数据库用户名
  passwd="root" # 数据库密码
)
print("是否连接：",mysql_db.is_connected())
print(mysql_db)

## 第二种连接方式
from mysql.connector import (connection)

mysql_connection = connection.MySQLConnection(user='root', password='root',
                                 host='192.168.10.222',
                                 database='test',port=3306)
print("是否连接：",mysql_connection.is_connected())
cursor = mysql_connection.cursor()
## 关闭连接
mysql_connection.close()

## 第三种连接方式
database_config = {
  'user': 'root',
  'password': 'root',
  'host': '192.168.10.222',
  'database': 'test',
  'raise_on_warnings': True
}

cnx = mysql.connector.connect(**database_config)
print("是否连接：",cnx.is_connected())
cnx.close()

3.创建表操作

import mysql.connector
from mysql.connector import errorcode
## 第二种连接方式
from mysql.connector import connection

## 创建表sql
sql = "create table user_test(user_id VARCHAR(10) not null,user_name VARCHAR(20) null )"


mysql_connection = connection.MySQLConnection(user='root', password='root',
                                 host='192.168.10.222',
                                 database='test',port=3306)
print("是否连接is_connected：",mysql_connection.is_connected())
print("连接信息get_server_info：",mysql_connection.get_server_info())
print("连接信息get_server_version：",mysql_connection.get_server_version())

cursor = mysql_connection.cursor()
try:
    ## 创建数据库
    cursor.execute(sql)
    ## 提交
    mysql_connection.commit()
    print("创建成功")
except mysql.connector.Error as error:
    ## 报错是否存在
    if error.errno == errorcode.ER_TABLE_EXISTS_ERROR:
        print("already exists.")
    else:
        print(error.msg)
else:
    cursor.close()
    ## 关闭连接
    mysql_connection.close()

4.插入数据操作

import mysql.connector
from mysql.connector import errorcode
## 第二种连接方式
from mysql.connector import connection

## 创建表sql
sql = "INSERT INTO `test`.`user_test` (`user_id`, `user_name`) VALUES ('2', '1')"


mysql_connection = connection.MySQLConnection(user='root', password='root',
                                 host='192.168.10.222',
                                 database='test',port=3306)
print("是否连接is_connected：",mysql_connection.is_connected())
print("连接信息get_server_info：",mysql_connection.get_server_info())
print("连接信息get_server_version：",mysql_connection.get_server_version())

cursor = mysql_connection.cursor()
try:
    ## 创建数据库
    cursor.execute(sql)
    ## 提交
    mysql_connection.commit()
    print("创建成功")
except mysql.connector.Error as error:
    ## 报错是否存在
    if error.errno == errorcode.ER_TABLE_EXISTS_ERROR:
        print("already exists.")
    else:
        print(error.msg)
else:
    cursor.close()
    ## 关闭连接
    mysql_connection.close()

5.读取数据

import mysql.connector
from mysql.connector import errorcode
## 第二种连接方式
from mysql.connector import connection
from mysql.connector.cursor import MySQLCursor

class MysqlTest:
    ## 创建表sql
    sql = "SELECT * FROM user_test "
   
    ## 查询所有数据
    def selectAll(self):
        mysql_connection = connection.MySQLConnection(user='root', password='root',
                                host='192.168.10.222',
                                database='test',port=3306)
        print("是否连接is_connected：",mysql_connection.is_connected())
        print("连接信息get_server_info：",mysql_connection.get_server_info())
        print("连接信息get_server_version：",mysql_connection.get_server_version())
        cursor = MySQLCursor(mysql_connection)
        try:
            ## 创建数据库
            cursor.execute(self.sql)
            ## 抓取所有数据
            data_rows = cursor.fetchall()
            for data in data_rows:
                print(data)
            print("查询成功")
            print("总行数：",cursor.rowcount)
        except mysql.connector.Error as error:
            ## 报错是否存在
            if error.errno == errorcode.ER_TABLE_EXISTS_ERROR:
                print("already exists.")
            else:
                print(error.msg)
        else:
            cursor.close()
            # ## 关闭连接
            mysql_connection.close()

    ## 查询一条数据
    def selectOne(self):
        mysql_connection = connection.MySQLConnection(user='root', password='root',
                                host='192.168.10.222',
                                database='test',port=3306)
        print("是否连接is_connected：",mysql_connection.is_connected())
        print("连接信息get_server_info：",mysql_connection.get_server_info())
        print("连接信息get_server_version：",mysql_connection.get_server_version())
        cursor = MySQLCursor(mysql_connection)
        try:
            ## 创建数据库
            cursor.execute(self.sql)
            ## 查询一条数据
            data_rows = cursor.fetchone()
            for data in data_rows:
                print(data)
            print("查询成功")
            print("总行数：",cursor.rowcount)
        except mysql.connector.Error as error:
            ## 报错是否存在
            if error.errno == errorcode.ER_TABLE_EXISTS_ERROR:
                print("already exists.")
            else:
                print(error.msg)
        else:
            # cursor.close()
            ## 关闭连接
            mysql_connection.close()


test = MysqlTest()
print("查一个")
test.selectOne()
test1 = MysqlTest()
print("查所有")
test1.selectAll()

以上为python 连接数据库的基本操作 主要使用 execute 方法