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Add clarity around repositories

David Ginzberg 7 anos atrás
pai
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1 arquivos alterados com 3 adições e 1 exclusões
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      README.md

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README.md Ver arquivo

@@ -122,10 +122,12 @@ Find the home number of John Smith
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 In this section we're going to re-create our service class using JPA. 
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-Start by breaking your `PersonService` class into an interface and implementation eg: `interface PersonService` and `class jdbcPersonServiceImpl`. Place the `@Service` annotation on the implementation class.
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+Start by breaking your `PersonService` class into an interface and implementation eg: `interface PersonService` and `class JdbcPersonServiceImpl`. Place the `@Service` annotation on the implementation class.
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 Now create a new class that implements the PersonService, this time with JPA. Once you annotate this class with @Service you will get an error when you start spring -- you can fix this by annotation the service you want to use with `@Primary` -- This tells Spring that if there are multiple beans competing for autowiring, the one marked with `@Primary` should be used (this won't work if multiple competing beans are marked `@Primary`
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+In your `JdbcPersonServiceImpl` you used a `JdbcTemplate` or `NamedParameterJdbcTemplate` to access the database. In your `JpaPersonServiceImpl` you will use a `PersonRepository` instead. You will have to define the interface for this repository, but the Spring Framework will provide the implementation automatically.
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 Implement all of the methods found in your `PersonService` interface in this new JPA-based service. You won't have to change your controller at all if you are autowiring a reference to a `PersonService` - Spring will automatically inject the `@Primary`-annotated implementation of `PersonService`
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 Remember that you won't be using the Jdbc service or any `JdbcTemplate` objects in this part of the lab.