从属性文件加载JPA存储库查询

Question

我需要从属性文件加载存储库中的查询。例如:

@Repository
public interface StudentRepository extends JpaRepository<Student, Integer> {
    @Query(value="SELECT * FROM student where year= :le", native=true)
    public List<Student> getStudentsByLevel(@Param("le") int level);
}

我需要从属性文件加载"SELECT * FROM student where year= :le"字符串。有什么办法吗?

Answer 1

如上所述，我通过使用xml配置的命名查询克服了这个问题。示例如下:

persistence . xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
    version="1.0">
    <persistence-unit name="hibernatePersistenceUnit">
        <!-- <mapping-file>META-INF/jpql/oracle-quries.xml</mapping-file> -->
        <mapping-file>META-INF/jpql/mysql-quries.xml</mapping-file>
    </persistence-unit>
</persistence>

mysql-quries.xml

<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings version="1.0"
    xmlns="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd ">
    <named-native-query name="Nodecontrol.lockNodeController">
        <query>
            SELECT * FROM student where year= :le
        </query>
    </named-native-query>
</entity-mappings>

在oracle- queries .xml和mysql- queries .xml中，我分别定义了所有的本机查询。当我需要改变查询而不改变类文件时，我只需要提到我需要在persistence.xml中使用的文件名。