連接數據庫
1.導入第三方庫
as:別名
import pymysql as mysql #加載所有
from pymysql import connect #加載局部
2.conncet連接函數
host = "localhost" #127.0.0.1=本機IP
user = "root"
password = "123456"
db = "mysql" #數據z庫
port = 3306 #number類型
dbHelp=mysql.connect(host=host,user=user,password=password,db=db,port=port)
print("連接成功")
3.獲取遊標:執行、編譯str類型SQL語句
cur=dbHelp.cursor()
4.創建表結構
cur.execute("CREATE TABLE IF NOT EXISTS user_info(ID INT PRIMARY KEY AUTO_INCREMENT"
",name VARCHAR(25))")
#1.插入:返回值,0,失敗 >0:成功
i=cur.execute("INSERT INTO user_info(name) VALUES('Liyifeng')")
dbHelp.commit() #提交
print(i)
#2.修改:返回值,0,失敗 >0:成功
#格式化字符串: %s:string %d:int
sql = "UPDATE user_info SET name='%s' WHERE id=%d"
i=cur.execute(sql%(("cxk",1)))
dbHelp.commit() #提交
print(i)
#3.查詢 :返回值更新的條目,0,失敗 >0:成功
sql = "SELECT * FROM user_info "
cur.execute(sql)
list = cur.fetchall() #提交
for item in list:
print(item[0],item[1])
# print(i)
#4.刪除 :返回值更新的條目,0,失敗 >0:成功
sql = "DELETE * FROM user_info WHERE id=%d "
cur.execute(sql)
dbHelp.commit()
# print(i)