属性文件外置配置

@ConfigurationProperties

@DataSourceProperties

DataSourceAutoConfiguration

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/**
 * {@link Condition} to detect when an embedded {@link DataSource} type can be used.
 * If a pooled {@link DataSource} is available, it will always be preferred to an
 * {@code EmbeddedDatabase}.
 */
static class EmbeddedDatabaseCondition extends SpringBootCondition {

	private final SpringBootCondition pooledCondition = new PooledDataSourceCondition();

	@Override
	public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
		ConditionMessage.Builder message = ConditionMessage.forCondition("EmbeddedDataSource");
		if (anyMatches(context, metadata, this.pooledCondition)) {
			return ConditionOutcome.noMatch(message.foundExactly("supported pooled data source"));
		}
		EmbeddedDatabaseType type = EmbeddedDatabaseConnection.get(context.getClassLoader()).getType();
		if (type == null) {
			return ConditionOutcome.noMatch(message.didNotFind("embedded database").atAll());
		}
		return ConditionOutcome.match(message.found("embedded database").items(type));
	}

}