Spring Boot MySQL tutorial shows how to use MySQL database in a Spring Bootapplication.
May 24, 2015 Contribute to netgloo/spring-boot-samples development by creating an account on GitHub. Use a MySQL database in a Spring Boot Web Application through Hibernate. Spring Boot makes it easy to create stand-alone, production-grade Spring based Applications that you can 'just run'. We take an opinionated view of the Spring platform and third-party libraries so you can get started with minimum fuss.
Spring is a popular Java application framework for creatingenterprise applications. Spring Boot is an evolution of Springframework which helps create stand-alone, production-grade Spring basedapplications with minimal effort.
MySQL is a leading open source database management system. It isa multi-user, multithreaded database management system. MySQL is especiallypopular on the web. It is one part of the very popular LAMP platform,which includes Linux, Apache, MySQL, and PHP. MySQL database is availableon most important OS platforms. It runs on BSD Unix, Linux, Windows, and Mac.
We are going to show how to install MySQL database on a Debian Linux system.
This command installs MySQL server and related packages.
These two commands are used to start and stop MySQL.
We check the status of the database with service mysql status
command.
Now we need to reset the root password. We start the mysql command line tool.(The server must be running.) We connect as root.
We set a new password for root.
We can use mysql_secure_installation
to increase security of MySQLserver. We are given the choice to improve the MySQL root password, removeanonymous user accounts, disable root logins outside of localhost, and removetest databases.
We create a new testdb
database.
We create a new MySQL user and grant it privileges to the testdb
database.
Now we are going to create a new MySQL table called cities
.
This is SQL to create the cities
table.
With the source
command, we execute the SQL statements.
The following application is a simple Spring Boot web application, which usesMySQL database. We have a home page with a link to display data from a databasetable. We use Freemarker templating system to join data with HTML.
This is the project structure.
Spring Boot starters are a set of convenient dependency descriptors whichgreatly simplify Maven configuration. The spring-boot-starter-parent
has some common configurations for aSpring Boot application. The spring-boot-starter-web
is a starterfor building web, including RESTful, applications using Spring MVC. Thespring-boot-starter-freemarker
is a starter for building MVC webapplications using Freemarker views. The spring-boot-starter-data-jpa
is a starter for using Spring Data JPA with Hibernate.
The mysql-connector-java
dependency is for the MySQL database driver.
The spring-boot-maven-plugin
provides Spring Boot support in Maven, allowing us to package executable JAR or WAR archives. Its spring-boot:run
goal runs the Spring Boot application.
In the application.properties
file we write various configurationsettings of a Spring Boot application. With the spring.main.banner-mode
property we turn off the Spring banner. With the logging.level.org.springframework
we set the logging level for spring framework to ERROR
.In the spring datasource properties we set up the MySQL datasource.
This is the City
entity. Each entity must have at least twoannotations defined: @Entity
and @Id
.
The @Entity
annotation specifies that the class is anentity and is mapped to a database table while the @Table
annotationspecifies the name of the database table to be used for mapping.
The primary key of an entity is specified with the @Id
annotation.The @GeneratedValue
gives a strategy for generating the values of primary keys.
By extending from the Spring CrudRepository
, we will havesome methods for our data repository implemented, including findAll()
.This way we save a lot of boilerplate code.
ICityService
provides the findAll()
contractmethod declaration to get all cities from the data source.
CityService
contains the implementation of the findAll()
method. We use the repository to retrieve data from the database.
CityRepository
is injected.
The findAll()
method of the repository returns the list ofcities.
MyController
class is annotated with @Controller
.
We inject an ICityService
into the countryService
field.
We map a request with the /showCities
path to the controller'sfindCities()
method. The @GetMapping
annotation maps a GET request to the method. The model gains a list of cities and the processing issent to the showCities.ftlh
Freemarker template file.
In the showCities.ftlh
template file, we display the data inan HTML table.
In the index.html
there is a link to show all cities.
The Application
sets up the Spring Boot application.The @SpringBootApplication
enables auto-configuration andcomponent scanning.
The IPBASE feature set in 12.3T does not support crypto and will not allow you to generate a crypto key. JimMichael is quite right. To generate a key you do need a feature set that supports crypto.
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After the application is run, we can navigate to localhost:8080
.
In this tutorial, we have showed how to use MySQL database ina Spring Boot application.
List out all Spring Boot tutorials.