Connect a PostgreSQL database to a Spring Boot Application Tutorial
Summary
TLDRThis tutorial video guides viewers on connecting a Spring Boot application with a PostgreSQL database. It covers creating a Maven project in Java 8, adding necessary dependencies, configuring properties for database connection, and using Spring Data JPA with Hibernate for ORM. The video demonstrates starting the application, creating a 'Person' entity, setting up a repository, and interacting with the database through a REST controller, showcasing CRUD operations.
Takeaways
- 😀 The video is a tutorial on connecting a Spring Boot application with a PostgreSQL database.
- 🔧 Viewers are directed to a previous video for instructions on installing PostgreSQL if needed.
- 🛠️ The tutorial uses Java 8 and Maven to create a Spring Boot project with web and JPA dependencies.
- 📚 Spring Data REST and Spring Boot Starter Data JPA are utilized for the project setup.
- 🔄 The video demonstrates the process of generating a Spring Boot project and importing it into IntelliJ.
- 🚫 The initial attempt to start the application fails due to missing data source URL details.
- 🌐 The data source URL and database credentials are retrieved from the PostgreSQL admin interface.
- 🔑 The tutorial explains how to configure the application properties for database connectivity.
- 🏗️ Hibernate is used internally by Spring Boot for JPA implementation, which requires setting the correct dialect.
- 📝 The video covers creating a 'Person' entity with ID and name fields, and setting up the corresponding JPA entity.
- 🔗 A repository interface is created extending JpaRepository to handle database operations for the 'Person' entity.
- 📡 A REST controller is set up to add and retrieve 'Person' data from the database using POST and GET mappings.
Q & A
What is the main topic of the video?
-The video is about connecting a Spring Boot application with a PostgreSQL database.
What programming language is used in the video?
-Java is the programming language used in the video.
What version of Java is mentioned in the video?
-Java 8 is mentioned in the video.
What is the purpose of Spring Initializer in the video?
-Spring Initializer is used to create a Maven project with specified dependencies for the Spring Boot application.
What dependencies are mentioned for the Spring Boot application?
-Dependencies mentioned include web, Spring Data JPA, and PostgreSQL driver.
Why is the application failing to start initially?
-The application fails to start initially because it cannot find the data source URL.
What property needs to be added to the application.properties file to fix the startup issue?
-The 'spring.datasource.url' property needs to be added with the correct PostgreSQL database URL.
What does JPA stand for and what is its role in the video?
-JPA stands for Java Persistence API, and it is used for managing relational data in the application.
What is the purpose of the 'spring.jpa.hibernate.ddl-auto' property in the application.properties file?
-The 'spring.jpa.hibernate.ddl-auto' property is used to specify whether the database schema should be created or updated automatically when the application starts.
What is the entity created in the video?
-A 'Person' entity is created in the video, with 'id' and 'name' as its fields.
What is the role of the 'PersonRepository' interface in the video?
-The 'PersonRepository' interface is used to define the data access layer for the 'Person' entity, extending the functionality provided by Spring Data JPA.
How is data added to the PostgreSQL database in the video?
-Data is added to the PostgreSQL database through a REST controller that handles POST requests to add new 'Person' entities.
How can the created 'Person' entity be retrieved from the database?
-The created 'Person' entity can be retrieved by accessing the appropriate REST endpoint, such as 'localhost:8080/person/{id}', where '{id}' is the ID of the person.
Outlines
📚 Introduction and Project Setup
In this section, the speaker introduces the video topic, which is about connecting a Spring Boot application with a PostgreSQL database. They suggest referring to a previous video for PostgreSQL installation instructions and then proceed to demonstrate setting up a Maven project in Java using Spring Initializr. They select Java 8 and add dependencies such as web, REST repository, and JPA. The speaker emphasizes the use of JPA instead of JDBC template and mentions using Lombok for boilerplate code generation. After generating the project, they extract it and import it into IntelliJ IDEA.
🔧 Configuring Database Connection
The speaker attempts to start the Spring Boot application but encounters a failure due to a missing data source URL. They explain the need to configure the database reference for JPA by adding properties for the database URL, port, and name. The configuration specifies using a JDBC connection to PostgreSQL on localhost:5432 with a database named 'YT_demo'. The speaker demonstrates how to add these properties in the application.properties file and successfully restart the application, showing that it can now connect to the database.
🛠 Creating Entities and Repositories
The speaker guides through creating a model object for 'Person' with fields for ID and name. They annotate it as an entity and specify the table name. Next, they create a repository interface for the 'Person' entity, extending JPA repository and annotating it as a rest resource. They restart the application and demonstrate accessing the 'Person' data via a RESTful endpoint at localhost:8080/person. Initially, the data is empty, so the speaker shows how to add data using a POST request through a REST controller.
🚀 Testing and Finalizing
In the final section, the speaker demonstrates how to add a new person to the database using a POST request. They verify the addition by querying the database and retrieving the inserted record via the REST endpoint. The speaker emphasizes the capabilities of the REST repository for handling CRUD operations and concludes the video by summarizing the steps taken to connect the Spring Boot application with PostgreSQL and manage data using JPA. They thank the viewers and encourage them to watch the next video.
Mindmap
Keywords
💡Springboard
💡PostgreSQL
💡Maven
💡JPA
💡Spring Initializer
💡REST Repository
💡Lombok
💡DataSource URL
💡Hibernate
💡Dialect
💡Entity
💡RestController
Highlights
Introduction to connecting a Spring Boot application with a PostgreSQL database.
Reference to a previous video on installing PostgreSQL.
Starting by creating a Maven project in Java using Spring Initializer.
Using Java 8 and dependencies for web development.
Choosing REST Repository and JPA for the project setup.
Using Spring Data JPA instead of JDBC template.
Utilizing Lombok for boilerplate code generation.
Generating the project with the specified dependencies.
Importing the generated project into IntelliJ.
Starting the application and encountering an error related to the data source URL.
Providing database connection details in the application properties.
Specifying the PostgreSQL JDBC URL and database name.
Restarting the application to establish a connection with the database.
Using Hibernate internally by Spring Boot for JPA implementation.
Configuring the PostgreSQL dialect for Hibernate.
Creating a new model object for a 'Person' entity.
Adding necessary fields to the 'Person' entity.
Creating a repository interface extending JpaRepository.
Restarting the application and accessing the '/person' endpoint.
Adding values to the database through a REST controller.
Querying the database to verify the added values.
Retrieving data from the database using the REST repository.
Conclusion and future plans for the next video.
Transcripts
hey guys welcome back
in this video we're going to see
how we can connect a springboard
application with postgres SQL database
right so if you have any doubt on how to
install the postgres SQL in your mission
you can refer to my previous video I'll
give you the link in the description and
also uh as a label okay so let's jump
into the video
let's start by going into spring
initializer I'm going to create a maven
project in Java
[Music]
that's what I'm going to use Java 8.
that dependencies I'm going to use web
so the normal dependencies what that
we'll use tools
I'm going to use rest
Repository
[Music]
what else you need uh I don't think I'm
going to get the main one is GPA that's
what we're going to use we are not going
to use jdbc template we are going to use
jspa
um I'll use Slumber for Generation the
boilerplate code generation
which driver okay I think that's all we
need let's click on generate so it will
generate the project for us
that we got we'll go to the folder
let me extract it
is
extracted
let me go to IntelliJ and import the
projector
foreign
[Music]
let's start the application now let's
see what happens
trying to start the application
[Music]
yeah it's failed uh it is searching for
the data source URL uh so that's where
it's failing so let's keep those details
because we have the postcode SQL refined
in our dependency so if you look at here
we have a post Craigslist SQL the jpa we
have to provide the data database
reference so the JPI is referring to the
data source URL that does not exist in
the resource let me go to the properties
and add few properties here which is
spring
the URL you can find it from our
admin you can just go to First cable
right click properties
and you can click on connection and you
can see it's on localhost
5432
right so let's take it from there
um
you're just going to see jdbc it's a
jdbc connection
and we are connecting it to post scratch
or screen skill
and the URL is going to be local
host
and five four three two that's the port
right and then we are going to use the
database which is here is YT demo that's
going to be very useful
right and we are we have the data source
so with this let's see let's let's start
the application so uh
let's restart the application again
[Music]
there you go the application is started
right it's able to connect to the
database and get all the details so I uh
JP is internally using hibernate to
connect the screen like here in
springboard so let's give some more
details like
um the dialect that it needs to use it
[Music]
but like the spring boot uses hibernate
for jpa implementation so that's why we
are providing the uh postgrades SQL
dialect
create so let's say if you want to
create anything create a table or
complete anything so we it will all work
in the way of postgres SQL
through JPM
so that's why we're giving this dialect
that's where it is and let's go and um
create the entities
so if you want to give more details
there are
like you can
provide I will need to show the details
or whatever it may be in the console you
can stop that and also you can update
the database
I mean like you can you can do a create
or update the database whenever the
server is restarted so all those stuff
you can do here so let me add that
property also
so far and let's go ahead and create a
new
model object
before and let's say let me create one
for
person
it's going to be a normal one right
create this
and I'll add it to a package called
Model so it should be
inside
temperature
as data
that way you don't need to give any
[Music]
Getters and Setters right and also this
is and this is going to be an entity for
us
jpa
and I'll also give the table name
and the table name is going to be
person
that's all it is and I'm going to create
a ID name
that's that's all I'm going to do now
create private
and
[Music]
long
ID
drive it
string name
so the two Fields I'm gonna create let
me go here and I just want to treat this
as an ID
there we go we created an object
entity we created an entity and we've
created an uh
created two uh members which is ID and
name this is going to be the columns one
is the ID which is the primary key for
this person let me go ahead and create
one more package which is Repository
foreign
let me add new
channel so it's going to be an interface
create an interface
it's going to be
Arsen repo
going to
extend this with jpa
I'm going to annotate this as
restroom
rest resource
and there you go that's all we need so
let me restart the application
[Music]
the start of the application let's go
ahead and hit this URL
localhost 8080 slash
person
I have this
to see what we have
here we have this URL
person
s
we see if you look at here the persons
is empty
so let's let's add some values to the
data database through our risk
controller let's create one risk
controller
you can add value for us
person raised person controller
[Music]
and we are going to use this as a
rest controller
will Define a
post mapping sorry
[Music]
[Music]
the name of course
we hit it from here
so by now it should have created uh
table here
very true
[Music]
because we
[Music]
start the server if the table does not
exist it will create
sell it
[Music]
foreign
[Music]
so let me go ahead here
and
head
add person
it's going to be post mapping and the
body is going to be
it's going to be
name
it's going to say and boom and
write this send it again
there you go it could add it
let me go to database and just query
this
[Music]
there you go we got the value updated
and if you want to get the value back
right so we already have the rest
repository configured so we just go here
and hit the URL just refresh the page so
you can see here there is a record in
this person
you can get through this person you in
this even through this URL let's give
slash zero
and you get there
get the complete object for that that's
why we are using the risk repository
here right so even like this way you can
do uh update delete you can create your
own methods and do it right
that's all uh
that's all we have for um
connecting springboard application with
a postgres SQL we'll see you in the next
video thanks for watching
[Music]
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