Django 数据库操作之数据库连接

Posted 2021-02-05 randomlee

修改settings.py文件

"""
Django settings for db_operation_demo project.

Generated by ‘django-admin startproject‘ using Django 2.1.5.

For more information on this file, see
https://docs.djangoproject.com/en/2.1/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/2.1/ref/settings/
"""

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/2.1/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = ‘[email protected]^55ibyauzd2c_*^[email protected]+44pj5g8u4hq)[email protected]$3u4z%)‘

# SECURITY WARNING: don‘t run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = [
    ‘django.contrib.admin‘,
    ‘django.contrib.auth‘,
    ‘django.contrib.contenttypes‘,
    ‘django.contrib.sessions‘,
    ‘django.contrib.messages‘,
    ‘django.contrib.staticfiles‘,
]

MIDDLEWARE = [
    ‘django.middleware.security.SecurityMiddleware‘,
    ‘django.contrib.sessions.middleware.SessionMiddleware‘,
    ‘django.middleware.common.CommonMiddleware‘,
    ‘django.middleware.csrf.CsrfViewMiddleware‘,
    ‘django.contrib.auth.middleware.AuthenticationMiddleware‘,
    ‘django.contrib.messages.middleware.MessageMiddleware‘,
    ‘django.middleware.clickjacking.XFrameOptionsMiddleware‘,
]

ROOT_URLCONF = ‘db_operation_demo.urls‘

TEMPLATES = [
    {
        ‘BACKEND‘: ‘django.template.backends.django.DjangoTemplates‘,
        ‘DIRS‘: [os.path.join(BASE_DIR, ‘templates‘)]
        ,
        ‘APP_DIRS‘: True,
        ‘OPTIONS‘: {
            ‘context_processors‘: [
                ‘django.template.context_processors.debug‘,
                ‘django.template.context_processors.request‘,
                ‘django.contrib.auth.context_processors.auth‘,
                ‘django.contrib.messages.context_processors.messages‘,
            ],
        },
    },
]

WSGI_APPLICATION = ‘db_operation_demo.wsgi.application‘


# Database
# https://docs.djangoproject.com/en/2.1/ref/settings/#databases

DATABASES = {
    ‘default‘: {
        ‘ENGINE‘: ‘django.db.backends.mysql‘,
        ‘NAME‘: ‘django_db1‘,
        ‘USER‘: ‘root‘,
        ‘PASSWORD‘: ‘passwd‘,
        ‘HOST‘: ‘localhost‘,
        ‘PORT‘: ‘3306‘

    }
}


# Password validation
# https://docs.djangoproject.com/en/2.1/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        ‘NAME‘: ‘django.contrib.auth.password_validation.UserAttributeSimilarityValidator‘,
    },
    {
        ‘NAME‘: ‘django.contrib.auth.password_validation.MinimumLengthValidator‘,
    },
    {
        ‘NAME‘: ‘django.contrib.auth.password_validation.CommonPasswordValidator‘,
    },
    {
        ‘NAME‘: ‘django.contrib.auth.password_validation.NumericPasswordValidator‘,
    },
]


# Internationalization
# https://docs.djangoproject.com/en/2.1/topics/i18n/

LANGUAGE_CODE = ‘en-us‘

TIME_ZONE = ‘Asia/Shanghai‘

USE_I18N = True

USE_L10N = True

USE_TZ = False


# Static files (CSS, javascript, Images)
# https://docs.djangoproject.com/en/2.1/howto/static-files/

STATIC_URL = ‘/static/‘

# pip3 install pymysql

修改__init__.py 文件

import pymysql
pymysql.install_as_MySQLdb()

 views.py

from django.shortcuts import render
from django.db import connection

def index(request):
    cursor = connection.cursor()
    # cursor.execute("insert into book(id,name,author) values(null,‘三国演义‘,‘罗贯中‘)")
    # cursor.executemany("insert into book(id,name,author) values(null,‘三国演义‘,‘罗贯中‘)")
    ‘‘‘执行多条sql语句‘‘‘
    cursor.execute("select * from book")
    # rows = cursor.fetchone()
    # rows = cursor.fetchmany(2)
    rows = cursor.fetchall()
    for i in rows:
        print(i)
    return render(request,‘index.html‘)

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