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Install Sqlite3:

opkg update
opkg install sqlite3-cli
sqlite3 /mnt/sda1/sensor.db
sqlite> CREATE TABLE sensor_data(
    id INTEGER PRIMARY KEY,
    temperature VARCHAR(64),
    sqlitetimestamp DATETIME DEFAULT CURRENT_TIMESTAMP
);
sqlite> INSERT INTO sensor_data (temperature) VALUES (30);
sqlite> select * from sensor_data;
sqlite>.quit

sqlitetimestamp DATETIME DEFAULT CURRENT_TIMESTAMP, will auto CURRENT_TIMESTAMP.

Php command line:

opkg update
opkg install php5-cli php5-mod-sqlite3
nano /mnt/sda1/sensor.php

#!/usr/bin/php-cli
<?php
$db = new SQLite3('/mnt/sda1/sensor.db');
$query = "INSERT INTO sensor_data (temperature) VALUES( ".$argv[1]." )";
$db->exec($query);
$db->close();
?>
chmod 755 /mnt/sda1/sensor.php
/mnt/sda1/sensor.php 50

ATmega32u4 code:

#include <Process.h>
void setup() {
 Bridge.begin();  // Initialize Bridge
}
void loop() {
 int temperature = 50 + random(0, 5);
 Process p;              
 p.begin("/mnt/sda1/sensor.php");      
 p.addParameter(String(temperature)); 
 p.run();
 delay(5000); 
}

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opkg update 
opkg install mysql-server
mysql -h192.168.0.20 -uroot -p
mysql> show databases;
mysql> CREATE DATABASE ARDUINO;
mysql> USE ARDUINO;
mysql> CREATE TABLE temperature (
id INT NOT NULL AUTO_INCREMENT,
sensor1 VARCHAR(20),
sensor2 VARCHAR(20),
insert_date TIMESTAMP,
PRIMARY KEY (id)
);
mysql> SHOW TABLES;

opkg update
opkg install python-mysql
nano /mnt/sda1/mysql.py

#!/usr/bin/python
# -*- coding: utf-8 -*-
import _mysql
import sys, string, os
try:
    	con = _mysql.connect('192.168.0.20', 'root', 'password', 'ARDUINO')
	sqlstr="INSERT INTO temperature(sensor1, sensor2) VALUES( '" + sys.argv[1] +"', '" + sys.argv[2] + "')"
	#print sqlstr
	con.query(sqlstr)   
except _mysql.Error, e:
    	print "Error %d: %s" % (e.args[0], e.args[1])
    	sys.exit(1)
finally:    
    	if con:
		con.close()

chmod 755  /mnt/sda1/mysql.py 
/mnt/sda1/mysql.py    'test1' 'test2'

Arduino code:

#include <Process.h>
int temperature;
void setup() {
 Bridge.begin();  // Initialize Bridge
}
void loop() {
 int sensor1 = random(0, 100);
 int sensor2 = random(0, 10);
 Process p;              
 p.begin("/mnt/sda1/mysql.py");      
 p.addParameter(String(sensor1)); 
 p.addParameter(String(sensor2)); 
 p.run();
 delay(5000); 
}

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At MYSQL console:

mysql> CREATE DATABASE sensors;
mysql> USE sensors;
mysql> CREATE TABLE sensor_data (
   -> id INT NOT NULL AUTO_INCREMENT,
   -> temperature INT,
   -> insert_date TIMESTAMP,
   -> PRIMARY KEY (id)
   -> );
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'password';
mysql> FLUSH PRIVILEGES;
mysql> INSERT INTO sensor_data (temperature) VALUES(20);
mysql> select * from sensor_data;
opkg update
opkg install php5-mod-mysqli
opkg install php5-cli
nano /mnt/sda1/db.php
#!/usr/bin/php-cli
<?php
$temperature = $argv[1]; 
$DBServer = '192.168.0.20'; 
$DBUser   = 'root';
$DBPass   = 'password';
$DBName   = 'sensors';  
$conn = new mysqli($DBServer, $DBUser, $DBPass, $DBName);
// check connection
if ($conn->connect_error) {
  trigger_error('Database connection failed: '  . $conn->connect_error, E_USER_ERROR);
}
$sql="INSERT INTO sensor_data (temperature) VALUES ($temperature)";
if($conn->query($sql) === false) {
  trigger_error('Wrong SQL: ' . $sql . ' Error: ' . $conn->error, E_USER_ERROR);
} 
?>
chmod 755 /mnt/sda1/db.php

Send test insert data:

/mnt/sda1/db.php  80

Arduino code:

#include <Process.h>
int temperature;
void setup() {
 Bridge.begin();  // Initialize Bridge
}
void loop() {
 int temperature = random(0, 100);
 Process p;              
 p.begin("/mnt/sda1/db.php");      
 p.addParameter(String(temperature)); 
 p.run();
 delay(5000); 
}

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The latest Yún shield's firmware should be "v2.0.5"

daef7d526145f6e314ea816cae14de5c *dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin

Model: Dragino v2
Version: Dragino-v2 common-2.0.5
Build Tue Jul 21 20:24:45 CST 2015

Yun Shield Firmware Change Log

If you have early version like this:

Version: Dragino-v2 common-1.3.4
Build Sat Aug  2 17:35:47 CST 2014

It is time to upgrade.

Download firmware image

Upgrading Using the Web Panel

Make sure the Yún shield and your computer are on the same network, and open a browser. Connect to the Yún shield's web panel page by entering the IP address.

Once logged in (default password:dragino), on the first page click upgade, on the upgrade page choose dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin at file system then click Upload buttom.

Upgrading Using the Command Line:

You can connect to the Yún shield via SSH and use a command line tool on your computer to upgrade the system's image.

To connect to your Yún via SSH, open the terminal application of your choice, and enter :

ssh root@ipaddress
cd /tmp/
wget http://www.ibuyopenwrt.com/images/dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin
md5sum  /tmp/dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin
daef7d526145f6e314ea816cae14de5c  /tmp/dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin
kill-bridge
exec sysupgrade -n "/tmp/dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin"
Sending TERM to remaining processes ... sleep uhttpd dbus-daemon dnsmasq thd ntpd link_arduino_ww rcS logger syslogd klogd hotplug2 ubusd netifd
Sending KILL to remaining processes ... uhttpd
Switching to ramdisk...
Performing system upgrade...
Unlocking firmware ...
Writing from  to firmware ...  [w]
Upgrade completed
Rebooting system...
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