DB Schema with their Sizes on Postgresql

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Nodejs as a service with SYSTEMD

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Choose our best site for essay writing, Our professionals right. phd thesis university of toronto - Change the way you cope with your task with our. Create a file nodejsapp.service with the following content on /usr/lib/systemd/system.

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Now using systemctl to control our app with the following commands

//whenever any service file is changes use daemon-reload 

sudo systemctl daemon-reload

// enabling this service at machines start

sudo systemctl enable nodejsapp

sudo systemctl disable nodejsapp

// to start the app.js service

sudo systemctl start nodejsapp

sudo systemctl stop nodejsapp

sudo systemctl restart nodejsapp

//check the status of service active 

sudo systemctl status nodejsapp

Once the Nodejs service is started successfully with no configuration errors, launch the web browser and check your application its running without npm start :).


Storing large object files into database is much interesting then saving path of files.
Large object data like images, document can be save into database by two simple method:
1> Save images in base encoded form that i had explained in my earlier article PHP Encoding with base64
2> Use BYTEA Data type in Postgresql.
“The BYTEA Data type allows storage of binary strings” you may say as RAW Bytes.
When you SELECT a Bytea type, PostgreSQL returns octal byte values prefixed with ‘\’ (e.g. \032). Users are supposed to convert back to binary format manually.

To Start with create column doc_image having data type “Bytea” in a table.
Now when you use file upload on your PHP projects, you will get file data in file super-global variable $_FILES
and you first have to move file to your server like i have move files to upload folder

move_uploaded_file($_FILES["file"]["tmp_name"], "/upload/".$_FILES["file"]["name"]);
// get data of image from upload folder
$dataString = file_get_contents("/upload/".$_FILES["file"]["name"]);
$raw_data = pg_escape_bytea($dataString); //Store this string into your databse.

Use “pg_escape_bytea” function, it returns escaped string for insertion into a bytea field., and store this raw string ($raw_data) to database.

Now to retrieve that file data use “pg_unescape_bytea” function,  It returns the unescaped string, possibly containing binary data.

and if you had used  image file to upload then use “pg_unescape_bytea” function to convert into binary and display to browser as

header(‘Content-type: image/jpeg’);
echo pg_unescape_bytea($fileStringfromDB);

mysqldump, An easy way to restore MySQL Database

A few days ago, I have to take my database dump which is in my local system and stored in MySQL, i tried from software tool phpMyAdmin but its take too much time and cannot succeed.
so i thought to restore my database by command line and use MySQL utility Sales CV example, IT sales CV example. Also retail, sales executive, field sales, IT CV, sales manager. Curriculum Vitae, dissertation sur le theatre comique. “mysqldump”.
I found its very easy and in less then a minutes its take all my databases dump.

To use it traverse to mysql bin directory.
to take dump there are various parameters with this command.
for a simple use type the following command

mysqldump -u root -p dbname > C:dbdump1.sql

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Another example

mysqldump -u[dbuser] -p[password] dbname > dump2.sql

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if you want to take all of your database dump at on go, below is command

mysqldump --all-databases --single-transaction --user=root  > dump3.sql

if you have set any password for your database then include “–password=dbpassword” to the above command, this is again insecure.

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include –databases <db1> <db2>, this allow you to take your specific databases dump

mysqldump --databases db1 db2--single-transaction --user=root --password &gt; dump4.sql