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Spring Cloud GCP DB SQL Example

This project is an example to deploy and connect Spring-boot application with Google Cloud Platform - Sql Cloud. requirements:

  • Database second generation and project with Java 8 on Appengine.
  • To have installed gcloud sdk with and Java components.

Understanding the project

Here is a demo how to use Spring JDBC and Spring Data based on the original repository examples from GoogleCloudPlatform

  1. To add compatibility with app engine standard was followed the next instructions, https://github.com/GoogleCloudPlatform/getting-started-java/tree/master/appengine-standard-java8/springboot-appengine-standard Summary:
  • Was changed Jar to War
  • Was created a new class ServletInitializer to initialize servlets
  • Was removed tomcat to left jetty as default
  • Was added appengine plugin and excluded jul-to-slf4j
  • Was added appengine-web.xml and logging.properties
  1. To do a connection using JDBC was reused the code from the next repository https://github.com/spring-cloud/spring-cloud-gcp/tree/master/spring-cloud-gcp-samples/spring-cloud-gcp-sql-sample Summary:
  • It automatically created a database with the user table and add some default values using schema.sql and data.sql files.
  1. To do connection with Spring data was using the next repository, https://github.com/spring-cloud/spring-cloud-gcp/tree/master/spring-cloud-gcp-samples/spring-cloud-gcp-data-jpa-sample Summary:
  • When apps run, create a table in the database which adds a new record

Setting preview for the project

Note: Make sure you are setting the right project id

  1. Grant permissions for connecting database on the next link https://console.cloud.google.com/iam-admin/iam select your project, then on IAM section find the default account should be similar to [email protected], click on edit icon and add Client SQL permissions on CloudSql->ClientSql now this account should have permissions for to operations on the database

  2. Activate Google Cloud Sql Api https://console.cloud.google.com/apis/library note: search exactly "Google Cloud Sql Api"

  3. Download your credentials on the next link. https://console.cloud.google.com/apis/credentials/serviceaccountkey you have to selection App Engine service account, create credencials and download the JSON key, then copy and substitute this json on the project file src/main/resources/keys-gcp.json

  4. Add properties to connect Google App Engine go to file application.properties and fill the next empty properties as this example.

  • spring.cloud.gcp.sql.database-name= YOUR_DATABASE_NAME
  • spring.cloud.gcp.sql.instance-connection-name= YOUR:INTANCE:NAME
  • spring.datasource.username= YOUR_DATABASE_USER
  • spring.datasource.password= YOUR_DATABASE_PASSWORD
  • spring.cloud.gcp.project-id= YOUR_PROJECT_ID

Test on local

Is very important the preview settings, your project will connect to sql cloud thanks to the credentials downloaded previously

then type

  • mvn appengine:run

To test JDBC conection go to http://localhost:8080/getTuples. To test SpringData conection go to http://localhost:8080/getHouses you will see your record. Check your database tables¡

Deploy To Google AppEngine

Make sure you are logged and have permissions of your project, use the next command

  • gcloud auth login

The credentials before are needed just for local

comment the properties line //spring.cloud.gcp.credentials.location=file:./src/main/resources/key.json

and then

mvn appengine:deploy

Use as archetype

borrar directorios com/example/ → jdbc y jpa borrar los archivos de resources/ sql data.sql y schema.sql

opcional →refactorizar el nombre del paquete com.example con esto se tiene un proyecto limpio

##Inicio rapido usando un entorno Flexible con un proyecto nuevo de spring initializr.

Descargar un proyecto de spring initializer con dependencia web.

agregar al Pom

<repositories>
    <repository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/libs-milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
</repositories>


		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>RELEASE</version>
        </dependency>

		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-gcp-starter-sql-mysql</artifactId>
            <version>RELEASE</version>
        </dependency>
        
 Agregar a properties
 
 spring.cloud.gcp.sql.database-name=testMotor

spring.cloud.gcp.sql.instance-connection-name= spring.cloud.gcp.project-id= spring.datasource.initialization-mode=always spring.datasource.continue-on-error=true spring.datasource.username= spring.datasource.password= spring.cloud.gcp.credentials.location=file:./src/main/resources/key.json spring.jpa.hibernate.ddl-auto=create-drop spring.jpa.database-platform=org.hibernate.dialect.MySQL55Dialect

Agrega un objeto de tipo @Entity mvn spring-boot:run mira en la consola como hace una conexión efectiva y se crea la tabla en la base de datos