Python3.6簡單的操作Mysql數據庫的三個實例

import pymysql
# 創建連接
# 參數依次對應服務器地址，用戶名，密碼，數據庫
conn = pymysql.connect(host='127.0.0.1', user='root', passwd='123456', db='demo')
# 創建游標
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
# 執行語句返回影響的行數
effect_row = cursor.execute("select * from course")
print(effect_row)
# 獲取所有數據
result = cursor.fetchall()
result = cursor.fetchone() # 獲取下一個數據
result = cursor.fetchone() # 獲取下一個數據（在上一個的基礎之上）
# cursor.scroll(-1, mode='relative') # 相對位置移動
# cursor.scroll(0,mode='absolute') # 絕對位置移動
# 提交，不然無法保存新建或者修改的數據
conn.commit()
# 關閉游標
cursor.close()
# 關閉連接
conn.close()

import pymysql
# 建立連接
conn = pymysql.connect(host='127.0.0.1', user='root', passwd='123456', db='demo')
# 創建游標
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
# 插入一條數據 %s是占位符 占位符之間用逗號隔開
effect_row = cursor.execute("insert into course(cou_name,time) values(%s,%s)", ("Engilsh", 100))
print(effect_row)
conn.commit()
cursor.close()
conn.close()

import pymysql.cursors
# 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()