Connect an Azure Database for MySQL instance to your application in Azure Spring Apps

1. In your project's pom.xml file, add the following dependency:

   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-data-jpa</artifactId>
   </dependency>
   <dependency>
       <groupId>com.azure.spring</groupId>
       <artifactId>spring-cloud-azure-starter-jdbc-mysql</artifactId>
   </dependency>
   

2. In the application.properties file, remove any spring.datasource.* properties.

3. Update the current app by running az spring app deploy, or create a new deployment for this change by running az spring app deployment create.

The following Terraform script shows how to set up an Azure Spring Apps app with Azure Database for MySQL.

provider "azurerm" {
  features {}
}

variable "application_name" {
  type        = string
  description = "The name of your application"
  default     = "demo-abc"
}

variable "administrator_login" {
  type        = string
  description = "The MySQL administrator login"
  default     = "myadmin"
}

resource "azurerm_resource_group" "example" {
  name     = "example-resources"
  location = "China North 2"
}

resource "random_password" "password" {
  length           = 32
  special          = true
  override_special = "_%@"
}

resource "azurerm_mysql_server" "database" {
  name                = "mysql-${var.application_name}-001"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location

  administrator_login          = var.administrator_login
  administrator_login_password = random_password.password.result

  sku_name                          = "B_Gen5_1"
  storage_mb                        = 5120
  version                           = "5.7"
  auto_grow_enabled                 = true
  backup_retention_days             = 7
  geo_redundant_backup_enabled      = false
  infrastructure_encryption_enabled = false
  public_network_access_enabled     = true
  ssl_enforcement_enabled           = true
  ssl_minimal_tls_version_enforced  = "TLS1_2"
}

resource "azurerm_mysql_database" "database" {
  name                = "mysqldb-${var.application_name}-001"
  resource_group_name = azurerm_resource_group.example.name
  server_name         = azurerm_mysql_server.database.name
  charset             = "utf8"
  collation           = "utf8_unicode_ci"
}

# This rule is to enable the 'Allow access to Azure services' checkbox
resource "azurerm_mysql_firewall_rule" "database" {
  name                = "mysqlfw-${var.application_name}-001"
  resource_group_name = azurerm_resource_group.example.name
  server_name         = azurerm_mysql_server.database.name
  start_ip_address    = "0.0.0.0"
  end_ip_address      = "0.0.0.0"
}

resource "azurerm_spring_cloud_service" "example" {
  name                = "example-springcloud"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
}

resource "azurerm_spring_cloud_app" "example" {
  name                = "example-springcloudapp"
  resource_group_name = azurerm_resource_group.example.name
  service_name        = azurerm_spring_cloud_service.example.name
  is_public           = true
  https_only          = true
}

resource "azurerm_spring_cloud_java_deployment" "example" {
  name                = "default"
  spring_cloud_app_id = azurerm_spring_cloud_app.example.id
  quota {
    cpu    = "2"
    memory = "4Gi"
  }
  instance_count      = 2
  jvm_options         = "-XX:+PrintGC"
  runtime_version     = "Java_11"

  environment_variables = {
    "spring.datasource.url" : "jdbc:mysql://${azurerm_mysql_server.database.fqdn}:3306/${azurerm_mysql_database.database.name}?useSSL=true&requireSSL=false&useLegacyDatetimeCode=false&serverTimezone=UTC"
    "spring.datasource.username" : "${var.administrator_login}@${azurerm_mysql_server.database.name}"
    "spring.datasource.password" : random_password.password.result
    "spring.jpa.properties.hibernate.dialect" : "org.hibernate.dialect.MySQL5InnoDBDialect"
  }
}

resource "azurerm_spring_cloud_active_deployment" "example" {
  spring_cloud_app_id = azurerm_spring_cloud_app.example.id
  deployment_name     = azurerm_spring_cloud_java_deployment.example.name
}