spring.jpa.hibernate 配置和源码解析

@ConfigurationProperties("spring.jpa.hibernate")
public class HibernateProperties {
	// 命名策略配置
	private final Naming naming = new Naming();
	// DDL模式配置
	private String ddlAuto;
	...
	// 读取DDL模式配置，按优先级读取配置或默认值
	private String determineDdlAuto(Map<String, String> existing, Supplier<String> defaultDdlAuto) {
		// 1. 获取hibernate.hbm2ddl.auto配置值
		String ddlAuto = existing.get(AvailableSettings.HBM2DDL_AUTO);
		if (ddlAuto != null) {
			return ddlAuto;
		}
		// 2. 获取spring.jpa.hibernate.ddl-auto配置值
		if (this.ddlAuto != null) {
			return this.ddlAuto;
		}
		// 3. 获取jakarta.persistence.schema-generation.database.action配置值
		if (existing.get(AvailableSettings.JAKARTA_HBM2DDL_DATABASE_ACTION) != null) {
			return null;
		}
		// 4. 默认为null
		return defaultDdlAuto.get();
	}
	// 命名策略配置类
	public static class Naming {
		// 应用命名策略（没有配置属性则填充默认值）
		private void applyNamingStrategies(Map<String, Object> properties) {
			applyNamingStrategy(properties, AvailableSettings.IMPLICIT_NAMING_STRATEGY, this.implicitStrategy,
					() -> SpringImplicitNamingStrategy.class.getName());
			applyNamingStrategy(properties, AvailableSettings.PHYSICAL_NAMING_STRATEGY, this.physicalStrategy,
					() -> CamelCaseToUnderscoresNamingStrategy.class.getName());
		}
		...
	}
	...
}