在Spring Boot应用程序中外部化查询 [英] Externalize query in spring boot application

问题描述

我正在使用spring-boot 1.5.6 RELEASE.我想做一个基本的事情，将查询从存储库中的@Query批注移动到任何xml文件.

I am using spring-boot 1.5.6 RELEASE. I want to do a basic thing, move my queries from the @Query annotation in the repository to any xml file.

经过一番阅读，我发现我们可以使用orm.xml或jpa-named-queries.properties编写我的自定义查询.

After some reading, I figured out that we can use orm.xml or jpa-named-queries.properties to write my custom query.

我不了解这些XML文件必须存在的位置的文件结构.而且我的项目中没有META-INF文件夹.

I don't understand the file structure as to where these XML files have to be present. And I don't have a META-INF folder in my project.

示例:

POJO类:

@Entity
public Class Customer {

private int id;
private String name;

// getters and setters
}

存储库:

public interface CustomerRepository extends PagingAndSortingRepository<Customer,Integer> {

// this query I need from an external xml file as it might be quite complex in terms of joins
@Query("Select cust from Customers cust")
public List<Customer> findAllCustomers();

}

参考此stackoverflow问题.我需要知道这些文件(orm.xml和persistence.xml)在哪里存储，因为我没有META-INF文件夹.

Referred to this stackoverflow question. I need to know where these files (orm.xml and persistence.xml) need to be stored as I don't have a META-INF folder.

提前谢谢！

推荐答案

在resources文件夹中创建META-INF.现在，在该META-INF文件夹中创建jpa-named-queries.properties文件.

Create META-INF inside resources folder . Now create jpa-named-queries.properties file inside that META-INF folder.

在此属性文件中编写查询，如下所示:

Write your query inside this properties file like this:

Customer.findAllCustomerByNamedQuery=Select c from Customer c

其中Customer表示实体类的名称，而findAllCustomerByNamedQuery是查询名称

Where Customer denote name of entity class and findAllCustomerByNamedQuery is the query name

在您的客户存储库中，编写此代码以调用在属性文件中编写的查询:

In your customer repository write this to call your query written in properties file:

List<Customer> findAllCustomerByNamedQuery();

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