python3將變量寫(xiě)入SQL語(yǔ)句的實(shí)現(xiàn)方式
試了一下python操作數(shù)據(jù)庫(kù)，準(zhǔn)備將前端傳回來(lái)的用戶(hù)名和密碼寫(xiě)入表中
試了半天不會(huì)把變量加在在sql語(yǔ)句里面
網(wǎng)上搜索了一下，要用元組來(lái)傳遞多個(gè)參數(shù)
sql = "insert into userinfo values(%s,%s)" cursor.execute(sql,(name,password))
補(bǔ)充拓展：python往mysql數(shù)據(jù)庫(kù)中寫(xiě)入數(shù)據(jù)和更新插入數(shù)據(jù)
1. 連接mysql
import pymysql db = pymysql.connect(host='localhost', user='root', password='123456', port=3306, db='spiders') cursor = db.cursor() sql = 'select * from students;' cursor.execute(sql) cursor.close() db.close()
2. 多字段動(dòng)態(tài)插入mysql數(shù)據(jù)庫(kù)中
import pymysql
db = pymysql.connect(host='localhost',user='root', password='123456', port=3306, db='spiders')
data = {
'id': '20180606',
'name': 'Lily',
'age': 20
}
table = 'students'
keys = ', '.join(data.keys())
values = ', '.join(['%s'] * len(data))
sql = 'INSERT INTO {table}({keys}) VALUES ({values})'.format(table=table, keys=keys, values=values)
try:
cursor.execute(sql, tuple(data.values()))
print('Successful')
db.commit()
except:
print('Failed')
db.rollback()
cursor.close()
db.close()
3. 數(shù)據(jù)更新插入mysql數(shù)據(jù)庫(kù)中
import pymysql
db = pymysql.connect(host='localhost',user='root', password='123456', port=3306, db='spiders')
data = {
'id': '20180606',
'name': 'Lily',
'age': 25
}
table = 'students'
keys = ', '.join(data.keys())
values = ', '.join(['%s'] * len(data))
sql = 'INSERT INTO {table}({keys}) VALUES ({values}) ON DUPLICATE KEY UPDATE'.format(table=table, keys=keys, values=values)
update = ','.join([" {key} = %s".format(key=key) for key in data])
sql += update
try:
cursor.execute(sql, tuple(data.values())*2)
print('Successful')
db.commit()
except:
print('Failed')
db.rollback()
cursor.close()
db.close()
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