python 中的多个 sql 语句

Question

我尝试从 mysql 更新多个数据。这是我的代码：

que = "select id_pl from datapl
db = MySQLdb.connect("localhost", "root", "", "tuongdata")
cur = db.cursor()
cur.execute(que)
pl = cur.fetchall()
cur.close()
pl = [ i[0] for i in pl ]
di = './newsdata/'
for i in pl:
    lin = di + i + '/'
    numb = len([name for name in os.listdir(str(lin)) if os.path.isfile(os.path.join(lin, name))])
    qq = "update datapl set num = " + str(numb) + " where id_pl = " + str(i)
    cur = db.cursor()
    cur.execute(qq)
    cur.close()
    #print qq
db.close()

但是它不起作用，我不知道为什么:(

Answer 1

您似乎忘记在关闭连接之前提交更改。如果没有提交，数据库中将看不到任何更改。

que = "select id_pl from datapl"
db = MySQLdb.connect("localhost", "root", "", "tuongdata")
cur = db.cursor()
cur.execute(que)
pl = cur.fetchall()
cur.close()
pl = [ i[0] for i in pl ]
di = './newsdata/'
for i in pl:
    lin = di + i + '/'
    numb = len([name for name in os.listdir(str(lin)) if os.path.isfile(os.path.join(lin, name))])
    qq = "update datapl set num = " + str(numb) + " where id_pl = " + str(i)
    cur = db.cursor()
    cur.execute(qq)
    cur.close()
    db.commit() # <---- Commits after each execution.
    #print qq
db.close()

python 中的多个 sql 语句

Multiple sql statement in python

python

mysql-python

python-2.7