在 Java 中动态连接数据库（Spring Boot）

Question

I Want to connect to database at every http request(In every request i will be getting database details from user).Can anyone suggest how to do it using spring-boot-starter-jpa.

I can't use properties file for database configuration details. because details i will be getting from http request dynamically.

I am using 2.0.0.M3 spring boot version.

Answer 1

I would suggest you to better use native JDBC code to connect with database and perform query. if you want to use spring data jpa then you have to create bean for DataSource , EntityManagerFactory and JpaTransactionManager at runtime.

Answer 2

If database details will come in every user request and you want connect database on every http request, then it is not preferable because you will not have even entity manager factory on application startup without database instantiation. However in this situation you would have to manually manage all those stuff. You have to create datasource, transaction manager , entity manager etc. instantiation and initialization on each request manually and register those with spring IOC container and after the request completion you have to manually remove (unregister) those instances from Spring IOC. You can alos create interceptors for that. But no one should do this manually process because it is so hactic and more complex and we are making burden of this instantiation to destroy of beans on our own. Even spring manages it very well and we are making complexity by taking charge at our own.

Answer 3

我觉得直接连接用户的数据库可能不太合适。我建议做一个接口程序，把你需要的动态数据收集到一个数据库中。你不能在你的代码中改变连接参数的属性。

Answer 4

You need to load properties file of spring boot in a class using @ConfigurationProperties anotation.

Also you need to call the database configuration api inside this class.

Answer 5

Same requirement and I am sure all the database I connect to would have the same structure

Any solution till now?