Question

基本上，我试图将超声波传感器的结果发送到mysql db。我能够将手动输入的数据发送到INSERT中。但是，我无法发送变量结果。

这是获取号码的脚本：

elapsed = stop - start    
# Distance pulse travelled in that time is time
# multiplied by the speed of sound (cm/s)
distance = elapsed * speedSound

# That was the distance there and back so halve the value
distance = distance / 2
distance = '{:f}'.format(distance)
print(distance)

结果看起来像6.110798。

然后，我尝试发送它做DB：

# Open database connection
db = MySQLdb.connect("192.168.2.3","DB","**********","Ultrasonic_IoT" )

# prepare a cursor object using cursor() method
cursor = db.cursor()

# Prepare SQL query to INSERT a record into the database.
sql = "INSERT INTO Pi (distance) VALUES (%distance)"

try:

    # Execute the SQL command
    cursor.execute(sql)
    # Commit your changes in the database
    db.commit()

except:
    # Rollback in case there is any error
    db.rollback()

    # disconnect from server
    db.close()

我在VALUE中尝试了不同的组合，但我仍然卡住了。

Answer 1

好的，这就是诀窍

sql = "INSERT INTO UltraSonic (distance) VALUES (%s)"

尝试：＃执行SQL命令 cursor.execute（sql，（distance））

从python脚本插入mysql变量

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