‘壹’ python 如何把变量的值传递给execute的sql中去
python 把变量的值传递给execute的sql中去的代码:
import pymysql
db = pymysql.connect(host="119.XX.XX.XX",
port=3306,
user="XXXXXXXX",
passwd="XXXXXXXXXXXXX",
db="XXXXXX",
charset='utf8')
# %s 占位符为需要传递的参数,切记不要加''双引号,要不然会报错
sql = "SELECT totalusercount * 1.4 FROM mm_project_uv_outdoor WHERE poiid = %s AND currenttime = %s"
cursor = db.cursor()
# 以下为传递多个参数的用法
cursor.execute(sql,['B00140N5CS','2019-04-23'])
# 传递单个参数时 cursor.execute(sql,'B00140N5CS')
print(cursor.fetchall())
db.close()
(1)pythonsql变量赋值扩展阅读:
函数
Python的函数支持递归、默认参数值、可变参数,但不支持函数重载。为了增强代码的可读性,可以在函数后书写“文档字符串”(Documentation Strings,或者简称docstrings),用于解释函数的作用、参数的类型与意义、返回值类型与取值范围等。可以使用内置函数help()打印出函数的使用帮助。比如:
>>> def randint(a, b):
... "Return random integer in range [a, b], including both end points."...
>>> help(randint)
Help on function randint in mole __main__:
randint(a, b)
Return random integer inrange[a, b], including both end points.