Add support for configuring the Redis database using spring.data.redis.url

[Demonese]

Both Jedis and Lettese clients support specifying a database in the URL

• Jedis: https://github.com/redis/jedis/blob/master/src/main/java/redis/clients/jedis/util/JedisURIHelper.java
• Lettuce: https://github.com/redis/lettuce/wiki/Redis-URI-and-connection-details

Unfortunately, spring-boot-autoconfigure ignore them

	@Override
	public Standalone getStandalone() {
		if (this.properties.getUrl() != null) {
			ConnectionInfo connectionInfo = connectionInfo(this.properties.getUrl());
			return Standalone.of(connectionInfo.getUri().getHost(), connectionInfo.getUri().getPort(),
					this.properties.getDatabase());
		}
		return Standalone.of(this.properties.getHost(), this.properties.getPort(), this.properties.getDatabase());
	}

This causes the following URL actually connect to database 0

spring:
  data:
    redis:
      url: redis://127.0.0.1:6379/8

The current workaround in my project is

spring:
  data:
    redis:
      url: redis://127.0.0.1:6379/8
      database: 8

: (

[snicoll]

@Demonese this is working as advertized. The documentation of the spring.data.redis.url property you used states:

Connection URL. Overrides host, port, username, and password. Example: redis:// user:password@example. com:6379

@mp911de do you think adding support for the database there would be useful?

[mp911de]

It would be. When a URL is provided, arguments provided through the URL should take precedence over other properties.

[wilkinsona]

Closing in favour of #43813.