From c6e0c1a1d40b958b84954d523f4dadc97adeff85 Mon Sep 17 00:00:00 2001 From: Administrator Date: Fri, 2 Feb 2024 00:17:10 +0100 Subject: [PATCH] docs: create test_transfer_odt_5 --- test_transfer_odt_5.html | 1808 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 1808 insertions(+) create mode 100644 test_transfer_odt_5.html diff --git a/test_transfer_odt_5.html b/test_transfer_odt_5.html new file mode 100644 index 0000000..197ab26 --- /dev/null +++ b/test_transfer_odt_5.html @@ -0,0 +1,1808 @@ + + + + + + + + + + + + + +

+
+ +

+


+ +

+


+ +

+


+ +

+

enabling +SSH

+

https://randomnerdtutorials.com/installing-raspbian-lite-enabling-and-connecting-with-ssh/

+ +


+ +

+

Establishing +an SSH Communication

+

$ +sudo ssh pi@192.168.178.25

+

user: +pi, pass: pi

+


+ +

+

Shutting +Down

+

$ +sudo poweroff

+


+ +

+


+ +

+


+ +

+


+ +

+

https://randomnerdtutorials.com/raspberry-pi-apache-mysql-php-lamp-server/

+

https://www.instructables.com/Installing-LAMP-Linux-Apache-MySQL-PHP-on-a-Raspbe/

+


+ +

+


+ +

+

Updating +and Upgrading

+

$ +sudo apt update && sudo apt upgrade -y

+


+ +

+


+ +

+


+ +

+


+ +

+

Install +Apache2

+

$ +sudo apt install apache2 -y

+


+ +

+

Testing +Apache installation

+

$ +cd /var/www/html

+

$ +ls -al

+

This +should show “index.html”

+


+ +

+

get +RasPi IP address

+

$ +hostname -I

+


+ +

+

enter +IP address into Browser → the Apache Debian page should appear

+


+ +

+


+ +

+


+ +

+


+ +

+

Install +PHP

+

$ +cd /var/www/html

+

$ +sudo apt install php -y

+

$ +sudo rm index.html

+


+ +

+

$ +sudo nano index.php

+

Add +following script into the php file:

+

<?php +echo "hello world"; ?>

+

Save +with Ctrl+X >> y >> Enter, or +Ctrl+O >> Enter >> Ctrl+X

+

OR

+

<?php +phpinfo(); ?>

+

OR

+

$ +echo "<?php phpinfo ();?>" > +/var/www/html/index.php

+


+ +

+

Restart +Apache

+

$ +sudo service apache2 restart

+


+ +

+

test +if Apache2 is serving .php files by opening RasPi IP address in +browser +

+


+ +

+

if +all is fine, index.php can be removed

+

$ +sudo rm index.php

+


+ +

+


+ +

+


+ +

+

Install +MySQL (MariaDB Server)

+

$ +sudo apt install mariadb-server php-mysql -y

+

$ +sudo service apache2 restart

+

$ +sudo mysql_secure_installation

+

In +all cases, answer with y

+


+ +

+

create +new user “admin” with password +“your_password”

+

$ +sudo mysql --user=root --password

+

> +create user admin@localhost identified by 'your_password';

+

> +grant all privileges on *.* to admin@localhost;

+

> +FLUSH PRIVILEGES;

+

> +exit;

+


+ +

+

Important +to generate user that is not limited to a certain domain!!

+

> +grant all privileges on *.* to +'admin3'@'%';

+


+ +

+


+ +

+


+ +

+


+ +

+

Install +phpMyAdmin

+

$ +cd /var/www/html

+

$ +sudo apt install phpmyadmin -y

+


+ +

+

Options:

+ +


+ +

+

$ +sudo phpenmod mysqli

+

$ +sudo service apache2 restart

+


+ +

+

open +following address

+

+http://192.168.178.25/phpmyadmin

+


+ +

+

if +“Not Found”

+

$ +cd /var/www/html

+

$ +sudo ln -s /usr/share/phpmyadmin /var/www/html/phpmyadmin

+

$ +ls

+

>> +phpmyadmin

+


+ +

+

again, +open following address

+

http://192.168.178.25/phpmyadmin

+


+ +

+

login +with username=root, password=pi

+


+ +

+


+ +

+


+ +

+


+ +

+

change +the permissions for your /var/www/html/ folder.

+

$ +cd ~

+

$ +ls -lh /var/www/

+

$ +sudo chown -R pi:www-data /var/www/html/

+

$ +sudo chmod -R 770 /var/www/html/

+

$ +ls -lh /var/www/

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+

https://randomnerdtutorials.com/esp32-esp8266-raspberry-pi-lamp-server/

+


+ +

+


+ +

+

Create +database:

+ +


+ +

+


+ +

+

Create +table by calling SQL query:

+

CREATE +TABLE SensorData (

+

+ id INT(6) UNSIGNED AUTO_INCREMENT +PRIMARY KEY,

+

+ sensor VARCHAR(30) NOT NULL,

+

+ location VARCHAR(30) NOT NULL,

+

+ value1 VARCHAR(10),

+

+ value2 VARCHAR(10),

+

+ value3 VARCHAR(10),

+

+ reading_time TIMESTAMP DEFAULT +CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP

+

)

+


+ +

+


+ +

+

PHP +script that is responsible for receiving incoming requests from the +ESP32 or ESP8266 and inserting the data into a MySQL database.

+

$ +cd ~

+

$ +nano /var/www/html/post-esp-data.php

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+

https://github.com/ChuckBell/MySQL_Connector_Arduino/wiki/Troubleshooting

+

tr +to connect to msql from another computer:

+

$ +mysql -uadmin +-ppi +–h192.168.178.25 –port=3306

+

$ +mysql --user=admin +--password=pi +--host=192.168.178.25 +--port=3306

+

$ +mysql --user=admin +--password=pi +--host= 127.0.0.1 +--port=3306

+


+ +

+

$ +mysql -u admin +-p pi +-h 127.0.0.1 test_arduino

+


+ +

+


+ +

+


+ +

+

Important +in case of “ERROR 2003 (HY000): Can't connect to local MySQL server +through socket”

+

$ +sudo nano /etc/mysql/mariadb.conf.d/50-server.cnf +

+

Here, +the binding address = 127.0.0.1 must be commented out!!!

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+

https://pawelrychlicki.pl/Article/Details/65/fixing-sqlstatehy000-2002-in-the-nextcloudowncloud-with-the-mysqlmariadb-and-the-tlsssl-ubuntu-linux-1804-server

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+

1Configuring WiFi in +headless mode

+

https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md

+

https://www.seeedstudio.com/blog/2021/01/25/three-methods-to-configure-raspberry-pi-wifi/

+


+
+ +

+

1.1ssh

+

To enable SSH on a headless Raspberry Pi, +simply place a file named “ssh”, without any extension, onto the +boot partition of the SD card from another computer. This will tell +Raspberry Pi to enable SSH when booting. The content of the file does +not matter.

+


+
+ +

+

1.2wpa_supplicant.conf +

+

$ sudo nano +/etc/wpa_supplicant/wpa_supplicant.conf

+


+
+ +

+

ctrl_interface=DIR=/var/run/wpa_supplicant +GROUP=netdev

+

update_config=1

+

country=<Country +Code>

+

network={

+

ssid="<SSID>"

+

psk="<PASSWORD>"

+

scan_ssid=1

+

}

+


+
+ +

+

2Arduino script for writing +to MariaDB/MySQL database

+

Check sketch “Complex_Insert_WiFi_BE”

+


+
+ +

+


+
+ +

+


+
+ +

+

3Showing DB content as html +page

+

https://randomnerdtutorials.com/esp32-esp8266-raspberry-pi-lamp-server/

+


+
+ +

+

$ nano /var/www/html/esp-data.php

+


+
+ +

+

open page http://192.168.178.25/esp-data.php

+


+
+ +

+

3.1esp-data.php

+

<!DOCTYPE html>

+

<html><body>

+

<?php

+

/*

+

Rui Santos

+

Complete +project details at +https://RandomNerdTutorials.com/esp32-esp8266-mysql-database-php/

+

+

+

Permission is +hereby granted, free of charge, to any person obtaining a copy

+

of this +software and associated documentation files.

+

+

+

The above +copyright notice and this permission notice shall be included in all

+

copies or +substantial portions of the Software.

+

*/

+


+
+ +

+

$servername = "192.168.178.25";

+


+
+ +

+

// REPLACE with your Database name

+

$dbname = "test_arduino";

+

// REPLACE with Database user

+

$username += "admin3";

+

// +REPLACE with Database user password

+

$password += "pi";

+


+
+ +

+

// Create connection

+

$conn = new mysqli($servername, $username, +$password, $dbname);

+

// Check connection

+

if ($conn->connect_error) {

+

die("Connection +failed: " . $conn->connect_error);

+

} +

+


+
+ +

+

$sql = "SELECT num, +message, +sensor_num, +value, +recorded +FROM hello_sensor +ORDER BY num +DESC";

+


+
+ +

+

echo '<table cellspacing="5" +cellpadding="5">

+

<tr> + +

+

<td>num</td> + +

+

<td>message</td> + +

+

<td>sensor_num</td> + +

+

<td>value</td> + +

+

<td>recorded</td> + +

+

</tr>';

+

+

+

if ($result = $conn->query($sql)) {

+

while ($row += $result->fetch_assoc()) {

+

$row_num += $row["num"];

+

$row_message += $row["message"];

+

$row_sensor_num += $row["sensor_num"];

+

$row_value += $row["value"];

+

$row_recorded += $row["recorded"];

+

// +Uncomment to set timezone to - 1 hour (you can change 1 to any +number)

+

//$row_reading_time += date("Y-m-d H:i:s", strtotime("$row_reading_time - 1 +hours"));

+

+

+

// +Uncomment to set timezone to + 4 hours (you can change 4 to any +number)

+

//$row_reading_time += date("Y-m-d H:i:s", strtotime("$row_reading_time + 4 +hours"));

+

+

+

echo +'<tr> +

+

<td>' +. $row_num +. '</td> +

+

<td>' +. $row_message +. '</td> +

+

<td>' +. $row_sensor_num +. '</td> +

+

<td>' +. $row_value +. '</td> +

+

<td>' +. $row_recorded +. '</td> +

+

</tr>';

+

}

+

$result->free();

+

}

+


+
+ +

+

$conn->close();

+

?> +

+

</table>

+

</body>

+

</html>

+


+
+ +

+


+
+ +

+


+
+ +

+

4Plotting of data from +MariaDB/MySQL database

+

https://randomnerdtutorials.com/visualize-esp32-esp8266-sensor-readings-from-anywhere/

+


+
+ +

+

$ sudo nano +/var/www/html/esp-chart.php

+

4.1esp-chart.php

+


+
+ +

+

<!--

+

Rui Santos

+

Complete +project details at https://RandomNerdTutorials.com

+

+

+

Permission is +hereby granted, free of charge, to any person obtaining a copy

+

of this +software and associated documentation files.

+

+

+

The above +copyright notice and this permission notice shall be included in all

+

copies or +substantial portions of the Software.

+


+
+ +

+

-->

+

<?php

+


+
+ +

+

$servername = "192.168.178.25";

+


+
+ +

+

// REPLACE with your Database name

+

$dbname = "test_arduino";

+

// REPLACE with Database user

+

$username += "admin3";

+

// +REPLACE with Database user password

+

$password += "pi";

+


+
+ +

+

// Create connection

+

$conn = new mysqli($servername, $username, +$password, $dbname);

+

// Check connection

+

if ($conn->connect_error) {

+

die("Connection +failed: " . $conn->connect_error);

+

} +

+


+
+ +

+

$sql = "SELECT num, +message, +sensor_num, +value, +value_h, +recorded +FROM hello_sensor +WHERE +sensor_num = 0 ORDER BY num +DESC limit 40";

+


+
+ +

+

$result = $conn->query($sql);

+


+
+ +

+

while ($data = $result->fetch_assoc()){

+

$sensor_data[] += $data;

+

}

+


+
+ +

+

$recorded += array_column($sensor_data, 'recorded');

+


+
+ +

+

// ******* Uncomment to convert readings +time array to your timezone ********

+

/*$i = 0;

+

foreach ($readings_time as $reading){

+

// +Uncomment to set timezone to - 1 hour (you can change 1 to any +number)

+

$readings_time[$i] += date("Y-m-d H:i:s", strtotime("$reading - 1 +hours"));

+

// +Uncomment to set timezone to + 4 hours (you can change 4 to any +number)

+

//$readings_time[$i] += date("Y-m-d H:i:s", strtotime("$reading + 4 +hours"));

+

$i += 1;

+

}*/

+


+
+ +

+

$value += json_encode(array_reverse(array_column($sensor_data, 'value')), +JSON_NUMERIC_CHECK);

+

$value_h += json_encode(array_reverse(array_column($sensor_data, 'value_h')), +JSON_NUMERIC_CHECK);

+

$recorded += json_encode(array_reverse($recorded), +JSON_NUMERIC_CHECK);

+


+
+ +

+

/*echo $value1;

+

echo $value2;

+

echo $value3;

+

echo $reading_time;*/

+


+
+ +

+

$result->free();

+

$conn->close();

+

?>

+


+
+ +

+

<!DOCTYPE html>

+

<html>

+

<meta name="viewport" +content="width=device-width, initial-scale=1">

+

<script +src="https://code.highcharts.com/highcharts.js"></script>

+

<style>

+

body {

+

min-width: +310px;

+

max-width: +1280px;

+

height: +500px;

+

margin: 0 +auto;

+

}

+

h2 {

+

font-family: +Arial;

+

font-size: +2.5rem;

+

text-align: +center;

+

}

+

</style>

+

<body>

+

<h2>ESP +Weather Station</h2>

+

<div +id="chart-temperature" class="container"></div>

+

<div +id="chart-humidity" class="container"></div>

+

<script>

+


+
+ +

+

var value += <?php echo $value; +?>;

+

var value_h += <?php echo $value_h; +?>;

+

var recorded += <?php echo $recorded; +?>;

+


+
+ +

+

var chartT = new Highcharts.Chart({

+

chart:{ +renderTo : 'chart-temperature' },

+

title: { +text: 'BME280 Temperature' },

+

series: [{

+

showInLegend: +false,

+

data: value

+

}],

+

plotOptions: +{

+

line: { +animation: false,

+

dataLabels: +{ enabled: true }

+

},

+

series: { +color: '#059e8a' }

+

},

+

xAxis: { +

+

type: +'datetime',

+

categories: +recorded

+

},

+

yAxis: {

+

title: { +text: 'Temperature (Celsius)' }

+

//title: { +text: 'Temperature (Fahrenheit)' }

+

},

+

credits: { +enabled: false }

+

});

+


+
+ +

+


+
+ +

+


+
+ +

+

var chartH = new Highcharts.Chart({

+

chart:{ +renderTo:'chart-humidity' },

+

title: { +text: 'BME280 Humidity' },

+

series: [{

+

showInLegend: +false,

+

data: +value_h

+

}],

+

plotOptions: +{

+

line: { +animation: false,

+

dataLabels: +{ enabled: true }

+

}

+

},

+

xAxis: {

+

type: +'datetime',

+

//dateTimeLabelFormats: +{ second: '%H:%M:%S' },

+

categories: +recorded

+

},

+

yAxis: {

+

title: { +text: 'Humidity (%)' }

+

},

+

credits: { +enabled: false }

+

});

+


+
+ +

+

</script>

+

</body>

+

</html>

+


+
+ +

+


+
+ +

+


+
+ +

+


+
+ +

+


+
+ +

+

5Using canvas.js

+

https://canvasjs.com/php-charts/multiseries-chart/

+


+
+ +

+


+
+ +

+


+
+ +

+

6External access to LAMP +server

+

port 22 (ssh), port 80 (http)

+


+
+ +

+

https://raspberrypi.stackexchange.com/questions/105080/how-to-remote-to-raspberry-pi-from-outside-local-network

+


+
+ +

+

https://howtoraspberrypi.com/enable-mysql-remote-connection-raspberry-pi/

+

Configure MySQL to accept external +connections to Raspberry Pi

+

$ sudo nano /etc/mysql/my.cnf

+

#bind-address = 127.0.0.1 <<<<< +comment the line bind-address

+

optionally +modify +the MySQL port to reduce risk of +attacks, e.g.

+

port = 8457

+


+
+ +

+

$ /etc/init.d/mysql +restart

+


+
+ +

+


+
+ +

+

7RasPi as Samba server

+

https://aallan.medium.com/adding-an-external-disk-to-a-raspberry-pi-and-sharing-it-over-the-network-5b321efce86a

+

SMB is the best protocol for use on multiple +platforms due to superior interoperability

+


+
+ +

+

in case of issue “chown: changing +ownership of '...': Operation not permitted”:

+

https://stackoverflow.com/questions/25559700/chown-command-returning-operation-not-permitted

+

get uid:

+

$ cat /etc/passwd |grep pi

+

get gid:

+

$ cat +/etc/group |grep pi

+

Give pi:pi access to the entire /mnt/usb +mount:

+

$ sudo mount -o remount,gid=<pi's +gid>,uid=<pi's +uid> /mnt/usb

+


+
+ +

+

Attention: FAT +file system doesn't support such permissions, so they can't be +applied after the drive is mounted

+

https://raspberrypi.stackexchange.com/questions/40408/how-to-change-permissions-on-external-hard-drive-connected-to-raspberry

+

Instead, drive should be formatted with pi +user and/or ntfs file sstem?

+


+
+ +

+


+
+ +

+

Mounting USB drive that +is NTFS???-formatted +under specific name:

+

$ sudo +fdisk -l

+

$ sudo umount /dev/sda1

+

$ sudo mkdir /mnt/usb

+

$ sudo chown -R pi:pi /mnt/usb

+

seems like this command has to be used each +time the usb drive is connected: $ sudo +mount /dev/sda1 /mnt/usb -o uid=pi,gid=pi

+


+
+ +

+

append following text to this file for +automatic mounting under the specified path:

+

$ sudo nano /etc/fstab

+

/dev/sda1 /mnt/usb auto defaults,user 0 1

+

OR:

+

/dev/sda1 /mnt/usb ntfs-3g +defaults,user,uid=1000,gid=1000,noatime 0 0

+

https://raspberrypi.stackexchange.com/questions/40408/how-to-change-permissions-on-external-hard-drive-connected-to-raspberry

+


+
+ +

+


+
+ +

+


+
+ +

+


+
+ +

+

Make the drive accessible from the network +by adding following text:

+

$ sudo apt-get install samba +samba-common-bin

+

$ sudo nano /etc/samba/smb.conf

+

[share]

+

Comment += Shared Folder

+

Path = +/mnt/usb

+

Browseable = yes

+

Writeable = Yes

+

only guest = no

+

create mask = 0777

+

directory mask = 0777

+

Public = yes

+

Guest ok = yes

+


+
+ +

+

$ chmod 1777 /mnt/usb +<<<< +the uSB should be mounted under this name

+

$ sudo /etc/init.d/samba restart

+


+
+ +

+


+
+ +

+

sudo service smbd restart

+

sudo service smbd status

+


+
+ +

+


+
+ +

+

https://www.raspberrypi.org/forums/viewtopic.php?t=56149

+

$ sudo df

+

$ cd /media

+

$ sudo mkdir +HDD

+

$ sudo nano +/etc/fstab

+

/dev/sda1 /media/HDD ntfs-3g + defaults,noatime 0 0

+

$ cp /etc/samba/smb.conf +/etc/samba/smb.conf.bak //Make a backup of the config file

+

$ nano +/etc/samba/smb.conf

+

[media] +

+

comment = Media share

+

path = /media/HDD

+

valid users = @users

+

force group = users

+

create mask = 0660

+

directory mask = 0771

+

read only = no

+


+
+ +

+


+
+ +

+

sudo service samba restart

+

sudo useradd ChooseUsernameHere -m -G users

+

sudo passwd TheChosenUsername //after this +choose a password for the new user

+

sudo smbpasswd -a TheChosenUsername //after +this enter passwd again

+

>>>>>>>>>>> +userA pi

+


+
+ +

+


+
+ +

+


+
+ +

+

mount in Win10/Linux/etc. as +smb://192.168.178.25/

+


+
+ +

+


+
+ +

+


+
+ +

+

https://raspberrytips.com/format-mount-usb-drive/

+

Formatting USB stick with RasPi:

+

$ sudo fdisk -l

+

$ sudo fdisk +/dev/sda1

+

Create a +new partition table : g (for GPT, use help for other format)

+

Create a +new partition : n

+

You can +keep the default values for a single partition

+

Confirm +with Y to remove the signature

+

And finally +write and exit fdisk: w

+

$ sudo +mkfs.ext4 /dev/sda1
+OR: $ sudo +mkfs.vfat /dev/sda1
+OR: $ sudo +mkfs.ntfs /dev/sda1

+


+
+ +

+


+
+ +

+

https://thepihut.com/blogs/raspberry-pi-tutorials/17699796-formatting-and-mounting-a-usb-drive-from-a-terminal-window

+

$ +sudo +mkfs -t vfat -I /dev/sda1

+

$ +sudo +mount /dev/sda1 +/mnt/usb +-o umask=000

+

$ +sudo umount /mnt/usb

+


+
+ +

+


+
+ +

+


+
+ +

+

8Filtering rows with SQL

+

https://chartio.com/blog/simple-sql-filtering-rows/

+

SELECT column_name1, column_name2

+

FROM table_name

+

WHERE column_name1 operator value;

+


+
+ +

+

SELECT *

+

FROM +hello_sensor

+

WHERE +sensor_num = 0 +

+

ORDER BY +`hello_sensor`.`recorded` DESC

+


+
+ +

+


+
+ +

+

9Python +MySQL

+

9.1Python MySQL Querying +Data

+

https://stackoverflow.com/questions/44634810/fastest-way-to-fetch-table-from-mysql-into-pandas

+

MyEngine=create_engine('[YourDatabase]://[User]:[Pass]@[Host]/[DatabaseName]', +echo = True)

+

Downloading:

+

df = pd.read_sql_query('select * from +[TableName]', con= MyEngine)

+

Uploading:

+

df.to_sql([TableName], MyEngine, if_exists = +'append', index=False)

+


+
+ +

+


+
+ +

+

9.2Using mysql +module

+

https://www.mysqltutorial.org/python-mysql-query/

+

https://www.codespeedy.com/fetch-data-from-mysql-table-in-python-program/

+

https://www.krazyprogrammer.com/2020/11/fetch-and-display-data-from-mysql-using.html

+

pip install mysql-connector

+


+
+ +

+

https://www.tutorialspoint.com/python_mysql/python_mysql_select_data.htm

+


+
+ +

+

import mysql.connector

+


+
+ +

+

#establishing the connection

+

conn = mysql.connector.connect(

+

user='admin3', +password='pi', +host='192.168.178.25', database='test_arduino'

+

)

+


+
+ +

+

#Creating a cursor object using the cursor() +method

+

cursor = conn.cursor()

+


+
+ +

+

#Retrieving single row

+

query += '''SELECT * from hello_sensor'''

+


+
+ +

+

#Executing the query

+

cursor.execute(query)

+


+
+ +

+

#Fetching 1st row from the table

+

result = cursor.fetchone();

+

print(result)

+


+
+ +

+

#Fetching first +two rows +from the table

+

result = cursor.fetchmany(size=2);

+

print(result)

+


+
+ +

+

#Fetching all +rows from +the table

+

result = cursor.fetchall();

+

print(result)

+


+
+ +

+

#Closing the connection

+

conn.close()

+


+
+ +

+


+
+ +

+

9.3Create table

+

https://www.tutorialspoint.com/python_mysql/python_mysql_create_table.htm

+

import mysql.connector

+


+
+ +

+

#establishing the connection

+

conn = mysql.connector.connect(

+

user='root', +password='password', host='127.0.0.1', database='mydb'

+

)

+


+
+ +

+

#Creating a cursor object using the cursor() +method

+

cursor = conn.cursor()

+


+
+ +

+

#Dropping EMPLOYEE table if already exists.

+

cursor.execute("DROP TABLE IF EXISTS +EMPLOYEE")

+


+
+ +

+

#Creating table as per requirement

+

sql ='''CREATE TABLE EMPLOYEE(

+

FIRST_NAME +CHAR(20) NOT NULL,

+

LAST_NAME +CHAR(20),

+

AGE INT,

+

SEX CHAR(1),

+

INCOME FLOAT

+

)'''

+

cursor.execute(sql)

+


+
+ +

+

#Closing the connection

+

conn.close()

+


+
+ +

+

9.4Insert data

+

https://www.tutorialspoint.com/python_mysql/python_mysql_insert_data.htm

+

import mysql.connector

+

#establishing the connection

+

conn = mysql.connector.connect(

+

user='root', +password='password', host='127.0.0.1', database='mydb'

+

)

+

#Creating a cursor object using the cursor() +method

+

cursor = conn.cursor()

+

# Preparing SQL query to INSERT a record +into the database.

+

insert_stmt = (

+

"INSERT +INTO EMPLOYEE(FIRST_NAME, LAST_NAME, AGE, SEX, INCOME)"

+

"VALUES +(%s, %s, %s, %s, %s)"

+

)

+

data = ('Ramya', 'Ramapriya', 25, 'F', 5000)

+

try:

+

# Executing +the SQL command

+

cursor.execute(insert_stmt, +data)

+

# Commit +your changes in the database

+

conn.commit()

+

except:

+

# Rolling +back in case of error

+

conn.rollback()

+

# Closing the connection

+

conn.close()

+


+
+ +

+


+
+ +

+


+
+ +

+

10Schedule periodic RasPi +reboot

+

https://raspberrypi.stackexchange.com/questions/2150/how-do-i-reboot-at-a-specific-time

+

https://smarthomepursuits.com/how-to-reboot-raspberry-pi-on-a-schedule/

+

$ sudo crontab +-e

+

>>>>> choose nano editor

+

>>>>> enter following command +at end of file for daily reboot +at 13:03:

+

03 13 * * * /sbin/shutdown -r now

+


+
+ +

+

Check time in Linux commandline:

+

https://www.lifewire.com/display-date-time-using-linux-command-line-4032698

+

$ date

+


+
+ +

+


+
+ +

+


+
+ +

+

11Install KeePass

+

https://keepass.info/download.html

+

https://sourceforge.net/p/keepass/discussion/329220/thread/17d1bd26/

+

sudo apt-add-repository ppa:jtaylor/keepass

+

sudo apt-get update

+

sudo apt-get install keepass2 +

+


+
+ +

+


+
+ +

+


+
+ +

+

12Clean +the repository of downloaded packages

+

https://askubuntu.com/questions/634820/how-can-i-delete-ubuntu-temp-files-which-are-created-during-software-installatio

+

sudo apt-get +autoclean

+

sudo apt-get +clean

+


+
+ +

+


+
+ +

+


+
+ +

+

13cleanup a +/var/log/journal in Linux

+


+
+ +

+

How to tell how much space is being taken?

+

$ journalctl +--disk-usage

+


+
+ +

+

Fix: Option 3 (RECOMMENDED!):

+

$ journalctl --vacuum-size=500M

+

This will delete old log files until the +directory reaches the threshold size stipulated, in our case, 500M.

+


+
+ +

+


+
+ +

+


+
+ +

+

14Change permission of +mounted drive

+

$ +sudo chmod -R 770 /media/bora/Medien

+

sudo mount -o rw,remount /media/bora/Medien

+


+
+ +

+

https://askubuntu.com/questions/948416/changing-ownership-of-read-only-file-system-i-cant-move-delete-rename-any-f

+

$ mount -v | +grep "^/" | awk '{print "\nPartition identifier: " +$1 "\n Mountpoint: " $3}'

+

$ sudo mount -o +remount,rw /dev/sda5 +/media/bora/Medien

+


+
+ +

+


+
+ +

+

“If you are +on a dual boot system and getting the error related to the read-only +file system. One probable cause could be that your other system is +not correctly shut down and might be in hibernation or sleep. So +login to that system and shut it down properly and religion to your +Linux system. this resolved the issue in my system”

+


+
+ +

+


+
+ +

+


+
+ +

+


+
+ +

+


+
+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+


+ +

+ + \ No newline at end of file