python使用Django框架pymysql库操作MySQL数据库

表格

数据库的基本使用语法

# 导入pymysql模块
import pymysql
 
# 连接database
conn = pymysql.connect(
    host=“你的数据库地址”,
    user=“用户名”,password=“密码”,
    database=“数据库名”,
    charset=“utf8”)
 
# 得到一个可以执行SQL语句的光标对象
cursor = conn.cursor()  # 执行完毕返回的结果集默认以元组显示
# 得到一个可以执行SQL语句并且将结果作为**字典返回**的游标
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
# 执行SQL语句
cursor.execute(sql)
 
# 关闭光标对象
cursor.close()
 
# 关闭数据库连接
conn.close()

从数据库里面显示数据

    conn = pymysql.connect(
            host='localhost', port=3306,
            user='root', passwd='123',
            db='本地', charset='utf8')
    cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
    cursor.execute('select  id, name from teachers')
    teachers_list = cursor.fetchall()
    cursor.close()
    conn.close()

向数据库里面添加数据

		conn = pymysql.connect(
            host='localhost', port=3306,
            user='root', passwd='123',
            db='本地', charset='utf8')
        cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
        cursor.execute('insert into teachers(name) values(%s) ', [v,])
        conn.commit()
        cursor.close()
        conn.close()

删除数据库里面的数据

	conn = pymysql.connect(
        host='localhost', port=3306,
        user='root', passwd='123',
        db='本地', charset='utf8')
    cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
    cursor.execute('delete from teachers where id= %s ', nid)
    conn.commit()
    cursor.close()
    conn.close()

修改数据库里面的数据

        conn = pymysql.connect(host='localhost', port=3306, user='root', passwd='123', db='本地', charset='utf8')
        cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
        cursor.execute('update class set title=%s where id = %s', [title, nid, ])
        conn.commit()
        cursor.close()
        conn.close()
        return redirect('/classes/')