DAY 10 | PHP AND MYSQL | VI SEM | B.CA | ACCESSING MYSQL | L1

Summary

The video script introduces the concept of databases, explaining them as organized collections of related data. It delves into Database Management Systems (DBMS), highlighting their role in managing and manipulating databases through various commands. The script focuses on MySQL, a popular relational DBMS, and its integration with PHP for creating dynamic web pages. It covers essential MySQL commands, such as creating and manipulating tables, inserting data, and setting up connections using PHP. The session aims to equip viewers with foundational knowledge to work effectively with databases and PHP.

Takeaways

• 😀 A database is a collection of related data, organized in a structured format.
• 🔐 To interact with a database, one must know specific commands that allow manipulation and management of the data.
• 🏫 The speaker is a faculty member from the Department of Computer Science at Vidyashram First Grade College, introducing a PHP and MySQL class.
• 📚 The session covers the basics of MySQL, a structured query language used for relational database management systems (RDBMS).
• 💾 Data is defined as raw facts, which can be static or figures, and is categorized by type such as text, number, or image.
• 📈 A database management system (DBMS) is application software used to manage and manipulate databases effectively.
• 🔑 MySQL is a popular RDBMS developed by Oracle Corporation, which uses tables organized in rows and columns.
• 🛠️ Commands like CREATE, INSERT, SELECT, UPDATE, and DROP are essential for database operations such as creating tables, inserting data, querying information, and deleting tables.
• 🔗 The script demonstrates how to connect PHP with MySQL, highlighting the use of variables for server name, username, and password.
• 💻 The session concludes with a practical example of connecting to a MySQL database using PHP, emphasizing the importance of checking the connection for errors.

Q & A

What is a database?

A database is a collection of related data, organized in a way that makes it easily accessible and manageable.

Why is it necessary to know commands to work with a database?

Commands are essential to interact with a database, allowing users to perform operations such as creating tables, inserting values, querying data, and managing the database.

What is the role of a Database Management System (DBMS)?

A DBMS is application software used to manage and manipulate databases. It facilitates the creation, querying, maintenance, and modification of databases.

What is the difference between data and a database?

Data refers to raw facts or figures, which can be static or dynamic. A database, on the other hand, is a structured collection of related data, typically organized in tables with rows and columns.

Can you explain the concept of a relational database management system?

A relational database management system (RDBMS) organizes data in tables with rows and columns. It uses a structured query language, like MySQL, to manage the data.

What is MySQL and how does it relate to PHP?

MySQL is a structured query language used for RDBMS. It can be used with PHP, a server-side scripting language, to create dynamic web pages and websites by connecting to MySQL databases and executing queries.

What command is used to create a new database in MySQL?

The command to create a new database in MySQL is 'CREATE DATABASE' followed by the database name, used to check if the database name already exists before creating it.

How do you insert values into a table in MySQL?

To insert values into a table in MySQL, you use the 'INSERT INTO' command followed by the table name and the values you want to insert into the specified columns.

What is the purpose of a primary key in a database?

A primary key is used to uniquely identify each record in a database table. It ensures that no two records have the same value for the primary key field.

How can you connect to a MySQL database using PHP?

In PHP, you can connect to a MySQL database using the 'mysqli' or 'PDO' extension. You need to provide the server name, username, and password to establish a connection.

What is the significance of the 'ALTER TABLE' command in MySQL?

The 'ALTER TABLE' command in MySQL is used to modify the structure of an existing table, such as adding or dropping columns, or modifying existing columns.

Outlines

00:00

📚 Introduction to Databases and MySQL

This paragraph introduces the concept of a database as a collection of related data and the necessity of commands to interact with it. It sets the stage for a PHP and MySQL class, explaining the basics of database management systems (DBMS) and differentiating between data and databases. The speaker, a faculty member from the Department of Computer Science, discusses the role of DBMS in managing and manipulating databases, giving examples of various types of databases and their applications.

05:00

🔍 Exploring Database Management Systems and MySQL

The speaker delves deeper into the types of database management systems, including object-oriented, relational, multimedia, network, and hierarchical systems. MySQL is highlighted as a product of Oracle Corporation and a prime example of a relational DBMS, which organizes data in rows and columns. The paragraph explains the MySQL commands based on Structured Query Language (SQL) and its compatibility with various operating systems. The concept of a query is introduced, describing how users write queries that are executed by the server to process and return data.

10:03

🛠️ Database Operations and Table Management

This section focuses on the practical aspects of working with databases, including checking the existence of a database, creating and using databases, and manipulating tables. The speaker explains the commands for creating a database with 'create database if not exists', using a database with 'use', and deleting a database with 'drop database if exists'. The concept of tables as organized collections of related data in rows and columns is discussed, along with commands for creating, checking, and displaying tables.

15:06

📋 Inserting and Manipulating Data in Tables

The paragraph discusses the process of inserting data into a table using the 'insert into' command, specifying the table name and the values to be inserted. It also covers how to delete a table using the 'drop table' command and how to display all tables in a database with the 'show tables' command. Further, it explains how to add new columns to a table or delete existing columns using the 'alter table' command, emphasizing the importance of understanding these commands for effective database management.

20:07

🔑 Understanding Primary Keys and PHP MySQL Connection

The importance of primary keys in uniquely identifying records in a database is explained, with an example of how to add and delete primary keys using the 'alter table' command. The paragraph then transitions to a sample PHP program that demonstrates how to connect to a MySQL database, detailing the variables and functions involved in establishing a connection and checking for errors. The focus is on the practical application of PHP and MySQL in creating dynamic web pages or websites.

25:10

🎓 Conclusion and Course Overview

In the concluding paragraph, the speaker summarizes the unit on MySQL and its commands, emphasizing the importance of understanding these concepts for creating dynamic web content. The structure of the subject, with five different units each carrying 12 marks, is outlined, indicating what students can expect in their final exams. The speaker thanks the students for their engagement and encourages them to continue learning, promising to meet again in another subject video.

Keywords

💡Database

A database is an organized collection of data, typically stored and accessed electronically. In the context of the video, a database is a fundamental concept for managing structured sets of related data, such as a student database containing records with fields like role number, name, and marks. The script uses the term to explain the basic unit of data storage and manipulation in database management systems.

💡Database Management System (DBMS)

A DBMS is application software that interacts with the user, software, and hardware to capture and analyze data. It includes various functionalities such as creating, querying, and maintaining databases. The video script emphasizes the role of a DBMS in managing and manipulating data effectively, distinguishing between different types of DBMS like relational, object-oriented, and hierarchical systems.

💡MySQL

MySQL is a popular open-source relational database management system (RDBMS). It uses structured query language (SQL) for database management. The script introduces MySQL as an example of an RDBMS, highlighting its use in conjunction with PHP for creating dynamic web pages and applications.

💡Structured Query Language (SQL)

SQL is a standard language for managing and manipulating relational databases. It is used for creating, modifying, and querying databases. The video script explains SQL as the basis for MySQL commands and discusses its importance in interacting with databases through commands like 'CREATE', 'INSERT', and 'SELECT'.

💡Table

In the context of databases, a table is a collection of related data stored in rows and columns. The script describes a table as the primary structure for organizing data within a database, using examples such as a 'student' table with columns for role number, name, and marks.

💡Primary Key

A primary key is a unique identifier for a record in a database table. It ensures that each row within a table can be uniquely identified. The script explains the concept of a primary key as a way to uniquely identify records, such as assigning a unique role number to each student in a 'student' table.

💡PHP

PHP is a server-side scripting language used for web development. The script mentions PHP as the front-end design language used in conjunction with MySQL for creating dynamic web pages, indicating its role in server-side logic and database interaction.

💡Data

Data refers to raw facts or figures that can be stored and recorded. The script defines data as the basic building blocks of information, which can be in various forms such as text, numbers, images, or multimedia files, and are organized into databases for structured storage and retrieval.

💡Insert

The 'INSERT' command in SQL is used to add new records to a database table. The script explains how to use the 'INSERT' command to insert values into a specified table, illustrating the process with examples of inserting student data.

💡Alter

The 'ALTER' command in SQL is used to modify the structure of a database table, such as adding or dropping columns. The script describes the 'ALTER' command as a way to change the fields of a table, such as adding a new column or dropping an existing one.

💡Drop

The 'DROP' command in SQL is used to delete a database table or to remove a column from a table. The script explains the 'DROP' command as a means to delete an entire table or to remove specific columns, thus altering the structure of the database.

Highlights

A database is defined as a collection of related data.

Understanding database commands is essential for interaction with a database.

Introduction to PHP and MySQL as a class by a faculty member from the Department of Computer Science.

Data is presented as raw facts or figures and can be static or dynamic.

A database management system (DBMS) is application software used to manage and manipulate databases.

Different types of DBMS include object-oriented, relational, multimedia, network, and hierarchical systems.

MySQL is a product of Oracle Corporation and is an example of a relational DBMS.

MySQL commands are based on the Structured Query Language (SQL) and support various operating systems.

A query is a request for information from a database, written by the user and executed by the server.

The process of connecting to a MySQL server requires a username and password.

The 'CREATE DATABASE' command checks for the existence of a database before creation.

The 'USE' command allows the user to work with a specific database.

The 'DROP DATABASE' command is used to delete a database if it exists.

The 'SHOW DATABASES' command displays a list of databases stored on the server.

Tables are created using the 'CREATE TABLE' command with specified column names and data types.

The 'INSERT INTO' command is used to insert values into a specified table.

The 'ALTER TABLE' command is used to modify an existing table by adding or dropping columns.

Primary keys are used to uniquely identify records in a database table.

PHP and MySQL can be used together to create dynamic web pages or websites.

The importance of understanding MySQL commands for creating and managing databases in PHP programming.

The session concludes with an overview of the subject matter and the structure of the course.

Transcripts

what is database it's a collection of

related data is known as datab base

suppose if I want to work with database

what I want I must know certain command

with the help of commands only I can

able to interact with the datab base

after creating a table okay what I want

to do I want to insert the values into

the table for that I'm going to have a

command called

insert hello to all a warm welcome to

PHP and MySQL class in this session I'm

going to deal about accessing my SQL I'm

your reati M faculty from the Department

of computer science vidyashram first

grade College the Temple of Excellence

mauru so dear student in my today's

session I'm going to deal with mySQL

along with the commands of the

MySQL so dear student we are familiar

with the concept datab base management

system so dear student at the beginning

I'm going to divide this database into

okay data okay then database

then I'm going to divide it into

database management system let me to

discuss what is data so what is data

data is nothing but the raw fact or it

can be a static or it can be a figure

and if it is stored or recorded then it

is called data for example if I consider

name okay it's soft typ what

text okay fine if I consider

age it's of what

number if I consider the

image it's of Type image so the example

for data is name number image audio file

video file and so on then what about

database database is nothing but the

collection of related data collection of

related

data so what is related data okay fine

if I consider think that I have a

database called

student if I consider student database

what are the thing I can have I can have

the role number that is nothing but the

usn then I can have the name of the

student at the same time I can have

the marks I can have the total even I

can have the percentage okay and if I

have certain records in this database

and each fields are related to each

other then it is called database so what

is database it's the collection of

related data is known as datab base then

what about database management system

see here I have the data I have the

database now what I want I want the

software to manage my database

effectively for that I'm going to have

the database management system so what

is database management system it's a

application software

used to manage and manipulate database

so what is manage and manipulate there

nothing but the creating the database

inserting the data to the database then

quering the quering the requirement or

quering the information maintaining the

database okay modifying the database all

these things are together called as

manipulation so what is data datase it's

a what is database it's a collection of

related data and what about database

management system it's a it's a

application software used to manage and

manipulate the

database and if I consider database I

can have the examples like student

database employee

database I can have the bank customer

database okay these are the example for

database and if I consider consider the

database management system I can have

the objectoriented database management

system even I can have the relational

database management system even I can

have the multimedia database management

system Network database management

system hierarchical database management

system so these are the example for

database management system then the

question arises what is my SQL so my SQL

is nothing but the my structured query

language it's example for relational

database management system so what is

relational database management system

that's nothing but the tables are stored

in the form of rows and columns that is

known as relational database management

system and this MySQL is the product of

Oracle Corporation

so what is myos stands for my structured

query language okay now I'm going to use

my SQL with the PHP so what is my front

end design okay I'm going to use I'm

going to use PHP and whatever the back

end that's nothing but the my SQL okay

fine see here MySQL commands are based

on this structured query language okay

which can support various operating

system in the sense what I can able to

install my

configuration with various operating

systems like Unix operating system or

Linux operating system Mac operating

system as well as Windows operating

system and this

MySQL command line command okay so we

have the we are going to get the command

prompt okay we are going to get the

screen so we are going to provide the

commands in the sense what we are going

to write the query okay so what is query

see here if I consider user okay users

are responsible for writing the query so

who is going to write the query that is

none other than user okay that query is

executed by the server okay if I

consider if I consider MySQL where I'm

going to execute MySQL is responsible

for executing the query after that

executing in the sense what it's going

to process the query and it's going to

return return the output so this command

allows us to connect with mySQL servers

with the user and that is username and

password suppose if I want to connect my

SQL Server what are the thing I want

want I want the username as well as

password anyway dear student we are

familiar with SQL right so that

structured query language so if I want

to connect to the database if I want to

connect what I want I want the username

as well as password similarly if I want

to connect with mySQL server what I

required I required the username as well

as password

so this is the example okay suppose if I

want to connect what's the command I

want to follow that's nothing but the

MySQL here U stands for username minus U

and you have to specify the username and

what about minus P okay it is minus P so

minus P stands for what it is password

suppose if I want to set the new

password

MySQL okay okay it is username minus U

to set new password minus P now see here

suppose if I want to work with database

so what is database the datas are

organized in the form of rows and

columns okay that is called as

database suppose if I want to work with

database what I want I must know certain

command

with the help of commands only I can

able to interact with the datab base so

a datab base stores the organized

collection of records records are

nothing but the data that can be

accessed and managed very easily and

datas are represented in the form of

tables so what is table see this is my

table what are the thing I have I have

the columns and I have the rows so this

is my column and what about this this is

my row so what is a database it's a

collection of related data and datas are

organized in the form of table okay fine

suppose if I want to check the existence

of the database okay in the sense what

suppose if I want to check the database

name is present in the database or not

so what I will do I'll use a command

called create so what's the command name

here create is a command name and I'll

write the keyword

database if not exits okay then I'm

going to specify the database name it

mainly used to check the database is

already name of the database is already

present or

not now okay see here

MySQL use database name think that I

have a I have created a database what is

the name of the

database

student okay fine now what I want to do

I want to use this database okay inside

this database I want to create the

tables like course

I want to create the tables like fees

okay I want to create the table like

internal marks

Now to create a table what I want I want

the database so I want to use the

database for that I'm going to have the

command called use so what is the

command name use and I want to write the

database

name okay fine suppose there are certain

time I want to delete the database from

the date I want to delete the database

okay for that what I will do I'll use a

command called drop okay what's my

command name drop then specify the

database name if exits okay what you

have to do you have to write the

database name next suppose if I want to

display the

databases then I have the commands like

show what's the command name show

database so it's going to display the

list of the DAT list of the database

which is stored in the current

server okay fine now I have a concept

called working with tables so what is

table it's a collection of related data

stored in the form of rows and columns

in the form of in the format of what

database okay now we have certain

commands Okay at the same time we are

going to display the syntax how to

create a table how to check the

existence of the table and so on now see

here suppose if I want to create a table

what is the command I'm going to use

that is nothing but the create as a

command at the same time I want to

specify the user

defined table name okay use the defined

table name so what about this one table

it's a keyword it's a key word then what

about table name it's a user

defined so user

defined table name

name create table I want to check right

suppose whatever the table I'm going to

create it's already stored in the

current server or not for that okay I

have the condition not exits okay and

you have to specify the table name at

the same time what I'm doing here I'm

displaying the column list for example

okay say what is my table name table

name is

stud okay fine if I consider the student

what are the column I have that is role

number okay then

name then percentage I'll consider only

the percentage or I can consider only

the result so instead of percentage I

can

consider result

Okay so these role number name and

results are nothing but the column

list after creating a table okay what I

want to do I want to insert the values

into the table for that I'm going to

have a command called insert so what is

my command name insert is my command

name okay into as a

keyword and I want to write the table

name okay fine so field one field 2

field

n values okay and I'm going to specify

the values so here fields are nothing

but the name of the column so here if I

consider the example role number is

nothing but my field name is nothing but

my field and result is also my

field okay fine so what is the command

used to create a table create table

table I want to check the presence of

the table so not exits okay then table

name column okay it's a list of columns

then to insert a value what's the

command insert into table name and

specify the role that is specify the

columns that nothing but the field one

field two up to field n values you have

to enter the value so it is value one

value two value

n suppose if I want to delete a table

what's the command okay I'm going to use

the command called drop then I'm going

to specify the table okay is a keyword

if exits okay and I'm going to write the

table name so if I consider this example

what's my table name stud is nothing but

the table name

okay suppose if I want to show the

tables which is present in the

particular database what's the command I

have the command called show okay I have

the command called show and I'll write

tables so this command helps to display

long list of table names next suppose if

I want to add new column that's nothing

but the new field to the existing in

table then what's the command name alter

is my command name table okay specify

the table name add and I'm going to add

the column

names suppose if I want to delete any

column then what is the command name

alter is a command Okay table and I'm

going to write the table name okay fine

then I'll write drop

okay fine suppose if I want to alter the

table okay what is the command alter

table table name then suppose if I want

to delete the column after deleting the

column what's going to happen I'm just

changing the table okay I'm just

changing the fields of the table so what

I will do first I'm going to start with

the alter table table name then I'm

going to continue with drop which field

that's Nothing But The Columns I want to

drop I'm going to specify in my

query okay fine suppose if I want to add

any primary key so why I want primary

key so what is p primary key stands for

dear student if I consider class okay

for example final year sixth semester

BCA students so that is third third year

that's nothing the final year okay which

semester six semester BCA student in my

class okay I have three

members whose name is Arash okay so

three members name is Arash so what I

want to do how I'm going to identify the

names uniquely for that I'm going to

have the primary key so in order to

identify the fields uniquely I'm going

to use primary the key okay so first

what I will do for the first student

okay for example

say my primary key is integer so I'm

going to assign the value one next for

second student okay what's the primary

key it is two for the third one what is

the key it is three so what is primary

key it's a unique identification

number so I just want to identify two or

more records uniquely for that I'm going

to have the primary key now how to add a

primary key so what's the command alter

table why I use alter table because this

table is created already okay so I just

want to modify that table so I'll start

with the alter table I'm going to write

the table name what I want to do I want

to add the primary key so add primary

key and which field I want to add

primary key so it is nothing but the

role number right so I want to specify

the column name that's nothing but the

field name that's nothing but the row

number suppose if I want to delete the

primary key what's the command delete

primary key okay so alter as a command

alter table I'm going to specify the

table name at the same time I'm going to

drop the primary key okay fine now I

have some sample program how we can able

to connect the mySQL

database okay fine so what is MySQL I

object oriented so what is sqli I stands

for my structure query language improved

version okay it is nothing but the

improved version and here I'm writing

which programming PHP program so I'm

writing the PHP program so how many

variables I'm considering here three

variables one for server name okay one

for usern name and one for password so

what is the name of the server that's

nothing but the Local Host

what is the name of the user that is

username and what is password it is

password okay all are what string okay

fine so I'm going to take a variable

called connection so in PHP if I cons if

I want to Define any variables we are

going to prefix the variable name with

the dollar

sign okay I'm going to establish new new

connection so new mysqli I okay I want

to consider the server name what I want

to pass server name then username and

password okay now I'm going to check the

connection if connection is connected

and if there is any error okay while

establishing the

connection if the sun if the myql

generates any error what I want to do I

want to check the connectivity right

so I'm going to check the connectivity

if it generates an error what I want to

do I want to I want to stop the

connection right so I'll use a method

called die okay connection failed okay

I'm going to display the error what kind

of error and why the connection has got

failed suppose if this is true what I

want to do I just want to display that

okay connection that is connected

successfully connections are applied

successfully or databases are connected

successfully fine now I have one more

example that is okay same thing I'm

writing the PHP code so Local Host

username password

okay fine now see here what I'm doing

see I'm taking the connection so my SQL

connect connections are established or

not I'm checking so what are the thing

I'm

passing the server name then username

and password if not connected okay if

there is no connections are established

I just want to display the message

connection failed suppose if the

connections are established successfully

then what I want to do I want to display

a message that connected

successfully anyway dear student in this

unit we just discussed how to access my

SQL in my PHP so what is the subject

name PHP and my SQL okay so how we can

able to use

PHP and

MySQL to create Dynamic web page or to

create Dynamic website anyway dear

student in this session I started with

what is

myql how to use the MySQL and certain

commands of

MySQL anyway dear student this is all

about the fifth unit and in the subject

subject we had five different unit from

this unit in the sense from each unit

okay carries 12 12 marks okay in the

final exam you can expect from each unit

12 marks anyway dear student thank you

for watching my session and thank you

for encouraging me and let's meet in

some other subject video until that keep

watching Ing and keep learning thank you