使用 python 将数据添加到 sqlite3,然后 php5 使用 python、php5、sqlite3 在 apache2 服务器上动态检索数据

Using python to add data to sqlite3, then php5 to retrieve data on apache2 server dynamically using python, php5, sqlite3

*更新 我正在尝试为我的儿子制作一个游戏,它有 2 个振动传感器代表 Balls 和 Strikes(用于棒球)。当传感器被击中时,我有一个循环,可以为击球或球添加一个滴答声。当传感器被击中时,我希望它也进入我的 sqlite 数据库。然后我有一个 php 文件,它读取 sqlite 数据库并实时显示球和击球。我正在使用 php5、sqlite3 和 apache2 服务器。我有服务器设置,python 脚本正确检测传感器并更新 2 个变量,balls 和 strikes。我似乎无法 link 将文件复制到 php 文件,所以当我导航到 basesloaded.php 时,它会执行 sensor.py。如果我 运行 py 脚本首先处于空闲状态,然后导航到 php 页面,它会正确更新 运行 来自 php 文件的 py 脚本。

#sensor.py file
#!/usr/bin/env python
import RPi.GPIO as GPIO
import time
import sqlite3

KnockPin = 12 
ShockPin = 13 

BtnPin = 15

inning = 1
runs = 0
strikes = 0
balls = 0

print ("Welcome to Bases Loaded!")

def setstr():
    global strikes
    strikes = 0
    global balls
    balls = 0

def setup():
    GPIO.setmode(GPIO.BOARD)         
    GPIO.setup(KnockPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(ShockPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(BtnPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)   

def knock(ev=None):

    with sqlite3.connect('basesLoaded.db') as conn;

        global strikes
        strikes += 1

        if strikes ==0:
            pass
        elif strikes == 1:            
            conn.execute("UPDATE bl set STRIKE = 1 WHERE ID =1");
            print ("Strike 1 :", conn.total_changes);

        elif strikes == 2:
            conn.execute("UPDATE bl set STRIKE = 2 WHERE ID=1");
            print ("Strike 2 :", conn.total_changes);

        elif strikes == 3:
            conn.execute("UPDATE bl set STRIKE = 0 WHERE ID=1");
            print ("Strike 3 Your Out :", conn.total_changes);

            global inning
            inning +=1
            conn.execute("UPDATE bl set INNING = inning WHERE ID=1");
            setstr()
            print ("Inning Number :", inning);

def shock(ev=None):
    with sqlite3.connect('basesLoaded.db') as conn;
        print ("Opened database successfully");
        global balls
        balls += 1

        if balls ==0:
            pass
        elif balls == 1:          
            conn.execute("UPDATE bl set BALL = 1 WHERE ID=1");
            print ("Ball 1 :", conn.total_changes);

        elif balls == 2:
            conn.execute("UPDATE bl set BALL = 2 WHERE ID=1");
            print ("Ball 2 :", conn.total_changes); 

        elif balls == 3:
            conn.execute("UPDATE bl set BALL = 3 WHERE ID=1");
            print ("Ball 3 :", conn.total_changes);

        elif balls == 4:

            global runs
            runs += 1
            conn.execute("UPDATE bl set BALL = 0 WHERE ID=1");
            conn.execute("UPDATE bl set RUN = 'runs' WHERE ID=1");
            print ("Run Scored! score is :", runs); 
            setstr()

def loop():

    GPIO.add_event_detect(ShockPin, GPIO.FALLING, callback=shock, bouncetime=2500)

    GPIO.add_event_detect(KnockPin, GPIO.FALLING, callback=knock, bouncetime=2500) 

if __name__ == '__main__':     # Program start from here
    setup()
    try:
        loop()

    except KeyboardInterrupt: 
        destroy()

这是我的 php 检索 sqlite 数据的脚本 -

#basesLoaded.php file
<?php
$try = exec('python sensor.py');
print_r ($try);
$db = new SQLite3('basesLoaded.db');

echo '<br>';
echo '<br>';
$strikes = ($db->querySingle('SELECT STRIKE FROM bl WHERE ID = 1'));
$balls = ($db->querySingle('SELECT BALL FROM bl WHERE ID = 1'));
$outs = ($db->querySingle('SELECT OUT FROM bl WHERE ID = 1'));
$runs = ($db->querySingle('SELECT RUN FROM bl WHERE ID = 1'));
$inning = ($db->querySingle('SELECT INNING FROM bl WHERE ID = 1'));


echo 'Strikes: ' . $strikes . '<br>';
echo 'Balls: ' . $balls . '<br>';
echo 'Outs: ' . $outs . '<br>';
echo 'Runs: ' . $runs . '<br>';
echo 'Inning: ' . $inning . '<br>';
?>

正如@Parfait 在评论中提到的,您需要提交更新以使其持久化。您的 PHP 代码没有看到更新,因为它们没有提交。

您可以在代码中调用 conn.commit(),但是,保证更新已提交(或在出现错误时回滚)的简单方法是使用 [=18= 打开数据库],即使用 with 语句,例如:

def knock(ev=None):
    with sqlite3.connect('basesLoaded.db') as conn:
        conn.execute("UPDATE bl set STRIKE = 1 WHERE ID =1")

现在您的更新将在 with 语句终止时自动提交,在本例中为函数 knock() returns 时,或者如果发生异常则回滚。


更新

如评论中所述,事件处理似乎存在问题。我怀疑您的代码需要显式保留 运行ning 否则,一旦主线程终止,整个程序将终止。你可以这样做:

WAIT_PIN = 14

def register_callbacks():
    GPIO.add_event_detect(ShockPin, GPIO.FALLING, callback=shock, bouncetime=2500)
    GPIO.add_event_detect(KnockPin, GPIO.FALLING, callback=knock, bouncetime=2500) 

def wait():
    GPIO.wait_for_edge(WAIT_PIN, GPIO.BOTH)    # wait for level change

#    # Or wait in a while loop        
#    while True:
#        time.sleep(0.1)

#    # Or wait for keyboard input
#    input('Press <ENTER> to quit: ')

if __name__ == '__main__':
    try:
        setup()
        register_callbacks()
        wait()    # block the main thread
    except KeyboardInterrupt: 
        destroy()  

您需要一直使用此 Python 脚本 运行ning。它独立于 PHP 脚本,后者 运行 仅用于响应通过您的网络服务器的 HTTP 请求。您可以 运行 Python 脚本作为后台进程:

$ python sensor.py &

此外,从您的 PHP 脚本中删除 exec() 调用。