#coding=utf-8
#連接數(shù)據(jù)庫測試
import pymysql
#打開數(shù)據(jù)庫
db = pymysql.connect(host="localhost",user="root",password="root",db="test")
#使用cursor()方法獲取操作游標(biāo)
cur = db.cursor()
#查詢操作
sql = "select * from books"
try:
 # 執(zhí)行sql語句
 cur.execute(sql) 
 results = cur.fetchall()
 #遍歷結(jié)果
 for rows in results:
  id = rows[0]
  name = rows[1]
  price = rows[2]
  bookcount = rows[3]
  author = rows[4]
  print("id: {}, name: {}, price: {}, bookcount: {}, author: {}".format(id,name,price,bookcount,author))
except Exception as e:
 raise e
finally:
 db.close()

#coding=utf-8
#插入操作
import pymysql
db = pymysql.connect(host="localhost",user="root",password="root",db="test")
cur = db.cursor()
sql = """insert into books(id,bookname,price,bookCount,author) values (4,'三體',20,3,'劉慈欣')"""
try:
 cur.execute(sql)
 #提交
 db.commit()
except Exception as e:
 #錯誤回滾
 db.rollback()
finally:
 db.close()

#coding=utf-8
#更新操作
import pymysql
db = pymysql.connect(host="localhost",user="root",password="root",db="test")
# 使用cursor()方法獲取游標(biāo)
cur = db.cursor()
sql_update = "update books set bookname = '%s',author = '%s' where id = %d"
try:
 cur.execute(sql_update % ("邊城","沈從文",4))
 #提交
 db.commit()
except Exception as e:
 #錯誤回滾
 db.rollback()
finally:
 db.close()

#coding=utf-8
#刪除操作
import pymysql
db = pymysql.connect(host="localhost",user="root",password="root",db="test")
#使用cursor()獲取操作游標(biāo)
cur = db.cursor()
sql_delete = "delete from books where id = %d"
try:
 #向sql語句傳遞參數(shù)
 cur.execute(sql_delete % (1))
 #提交
 db.commit()
except Exception as e:
 #錯誤回滾
 db.rollback()
finally:
 db.close()