python3將變量寫入SQL語句的實現(xiàn)方式
試了一下python操作數(shù)據(jù)庫,準備將前端傳回來的用戶名和密碼寫入表中
試了半天不會把變量加在在sql語句里面
網(wǎng)上搜索了一下,要用元組來傳遞多個參數(shù)
sql = "insert into userinfo values(%s,%s)" cursor.execute(sql,(name,password))
補充拓展:python往mysql數(shù)據(jù)庫中寫入數(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. 多字段動態(tài)插入mysql數(shù)據(jù)庫中
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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