使用python将数据添加到sqlite3，然后使用php5在python，php5，sqlite3中动态检索apache2服务器上的数据

Question

*更新我正在尝试为我的儿子做一个游戏，它有2个振动传感器，分别代表Balls and Strikes（用于棒球）。 当传感器被击中时，我有一个循环，可在击球或球上增加一个刻度。 当传感器被击中时，我还希望它也进入我的sqlite数据库。 然后我有一个php文件，该文件读取sqlite db并显示实时发生的球和打击。 我正在使用php5，sqlite3和apache2服务器。 我已经安装了服务器，python脚本正确地检测了传感器并更新了2个变量，球和打击。 我似乎无法将py文件链接到php文件，因此当我导航到basesloaded.php时，它将执行sensor.py。 如果我先在空闲状态下运行py脚本，然后导航到php页面，它将正确更新，只是不会从php文件运行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脚本，用于检索sqlite数据-

#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>';
?>

Answer 1

如@Parfait的评论中所述，您需要提交更新以使其持久化。 您的PHP代码未看到更新，因为未提交。

您可以在代码中调用conn.commit() ，但是，一种确保提交更新（或在发生错误时回滚）的简便方法是使用上下文管理器打开数据库，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，在with语句终止时（在这种情况下，函数knock()返回时knock()将自动提交更新，或者在发生异常时回滚更新。

---

更新资料

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

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()  

您需要一直运行此Python脚本。 它独立于仅通过Web服务器响应HTTP请求而运行的PHP脚本。 您可以将Python脚本作为后台进程运行：

$ python sensor.py &

另外，从您的PHP脚本中删除exec()调用。