h2的默认数据源url来自Spring Boot？

这将来自此类，该类还包含其他类型的内存数据库的默认值。

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-
autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/EmbeddedDatabaseConnection.java

H2(EmbeddedDatabaseType.H2, "org.h2.Driver","jdbc:h2:mem:%s;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE"),

如果符合条件，则通过DataSourceAutoConfiguration加载，

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-
autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration.java

数据库名称

testdb

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-
autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceProperties.java

private String name = "testdb";