postgresql status
command.postgres
user with administration priviliges was created with empty default password. As the first step, we need to set a password for postgres
.testdb
database with createdb
command,which is going to be owned by user12
.pg_hba.conf
file.trust
.psql
tool to connect to the database.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. It uses Tomcatas the default embedded container. The spring-boot-starter-thymeleaf
is a starter for building MVC web applications using Thymeleaf views. Thespring-boot-starter-data-jpa
is a starter for using Spring Data JPAwith Hibernate. postgresql
dependency is for the PostgreSQL database driver.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.application.properties
file we write various configurationsettings of a Spring Boot application. spring.main.banner-mode
property we turn off the Spring banner. To load a database that is not embedded, in Spring Boot 2 we need to add spring.datasource.initialization-mode=always
.To avoid conflicts, we turn off automatic schema creation with spring.jpa.hibernate.ddl-auto=none
.spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation
option is set avoid a recent issue. Without this option, we get the following error:City
entity. Each entity must have at least twoannotations defined: @Entity
and @Id
. @Entity
annotation specifies that the class is anentity and is mapped to a database table. The @Table
annotationspecifies the name of the database table to be used for mapping.@Id
annotation specifies the primary key of an entity and the @GeneratedValue
provides for the specification of generation strategies for the values of primary keys.schema-postgres.sql
scriptis executed provided that the automatic schema creation is turned off. The script creates a new database table.data-postgres.sql
file is executed to fill the table with data.CrudRepository
, we will havesome methods for our data repository implemented, including findAll()
.This way we save a lot of boilerplate code. ICityService
provides a contract method 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.findAll()
method of the repository returns the list of cities.MyController
contains one mapping.ICityService
into the countryService
field. Best note taking app for apple watch iphone and mac.showCities
path to the controller's findCities()
method. The default request isa GET request. The model gains a list of cities and the processing is sent to the showCities.html
Thymeleaf template file.showCities.html
template file, we display the data in an HTML table. https://renewcharter688.weebly.com/instagram-desktop-app-mac.html.index.html
there is a link to show all cities.Application
sets up the Spring Boot application. The @SpringBootApplication
enables auto-configuration and component scanning.localhost:8080
.