SpringData通过@Query注解支持JPA语句和原生SQL语句

在SpringData中们可是使用继承接口直接按照规则写方法名即可完成查询的方法，不需要写具体的实现，但是这样写又是不能满足我们的需求，比如子查询，SpringData中提供了@Query注解可以让我们写JPA的语句和原生的SQL语句，那接下来看看怎么写JPA的查询语句和原生的SQL语句。

 

package com.springdata.study.repository;

import java.util.List;

import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.Repository;
import org.springframework.data.repository.query.Param;

import com.springdata.study.entitys.Person;

//1.实际上Repository是一个口接口，没有提供任何方法，是一个标记接口
//2.实现了Repository接口就会被spring IOC容器识别为Repository Bean
//		会被纳入IOC容器中
//3.Repository接口也可以同@RepositoryDefinition 注解代替，效果是一样的
//4.接口中的泛型：第一个是那个实体类的Repository，第二个是实体类的主键的类型
//@RepositoryDefinition(domainClass=Person.class,idClass=Integer.class)

/**
 * 在Repository接口中申明方法 1.申明方法需要符合一定的规范 2.查询方法需要以 find | read | get开头 3.涉及查询条件时
 * 需要用条件关键字连接 4.属性首字母大写 5.支持级联属性
 * 6.AddressId若当前实体类中有属性，则优先使用该属性，若想要使用级联属性，需要用下划线隔开Address_Id
 */

public interface PersonRepositoiry extends Repository {
	// select p from Person where p.name = ?
	Person getByName(String name);

	List findByNameStartingWithAndIdLessThan(String name, Integer id);

	// where name like %? and id < ?
	List findByNameEndingWithAndIdLessThan(String name, Integer id);

	// where email in ? age < ?
	List readByEmailInOrAgeLessThan(List emails, int age);

	// 级联属性查询
	// where address.id > ?
	List findByAddress_IdGreaterThan(Integer is);

	// 可以使用@Query注解在其value属性中写JPA语句灵活查询
	@Query("SELECT p FROM Person p WHERE p.id = (SELECT max(p2.id) FROM Person p2)")
	Person getMaxIdPerson();

	// 在@Query注解中使用占位符
	@Query(value = "SELECT p FROM Person p where p.name = ?1 and p.email = ?2")
	List queryAnnotationParam1(String name, String email);

	// 使用命名参数传递参数
	@Query(value = "SELECT p FROM Person p where p.name = :name")
	List queryAnnotationParam2(@Param("name") String name);

	// SpringData可以在参数上添加%
	@Query("SELECT p FROM Person p WHERE p.name LIKE %?1%")
	List queryAnnotationLikeParam(String name);

	// SpringData可以在参数上添加%
	@Query("SELECT p FROM Person p WHERE p.name LIKE %:name%")
	List queryAnnotationLikeParam2(@Param("name")String name);

	//在@Query注解中添加nativeQuery=true属性可以使用原生的SQL查询
	@Query(value="SELECT count(*) FROM jpa_person", nativeQuery=true)
	long getTotalRow();
	
}

下面是这个类的测试类

package com.springdata.study.test;

import java.sql.SQLException;
import java.util.Arrays;
import java.util.List;

import javax.sql.DataSource;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.springdata.study.entitys.Person;
import com.springdata.study.repository.PersonRepositoiry;
import com.springdata.study.service.PersonService;

public class DataSourceTest {

	private ApplicationContext applicationContext;
	private PersonService personService;
	private PersonRepositoiry personRepositoiry;

	{
		applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
		personRepositoiry = applicationContext.getBean(PersonRepositoiry.class);
		personService = applicationContext.getBean(PersonService.class);
	}

	@SuppressWarnings("resource")
	@Test
	public void testDataSource() throws SQLException {
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
		DataSource dataSource = applicationContext.getBean(DataSource.class);
		System.out.println(dataSource.getConnection());
	}

	@Test
	public void testSpringdata() {
		Object person = personService.getPerson("LQF");
		System.out.println(person);
	}

	@Test
	public void testFindByNameStartingWithAndIdLessThan() {
		List persons = personRepositoiry.findByNameStartingWithAndIdLessThan("g", 6);
		persons = personRepositoiry.findByNameEndingWithAndIdLessThan("g", 6);
		System.out.println(persons);
	}
	
	@Test
	public void testReadByEmailInOrAgeLessThan() {
		List persons = personRepositoiry.readByEmailInOrAgeLessThan(Arrays.asList("[email protected]"), 25);
		System.out.println(persons);
	}
	
	@Test
	public void testFindByAddressIdGreaterThan() {
		personRepositoiry.findByAddress_IdGreaterThan(1);
	}
	
	@Test
	public void testGetMaxIdPerson() {
		Person person = personRepositoiry.getMaxIdPerson();
		System.out.println(person);
	}
	
	@Test
	public void testQueryAnnotationParam() {
		List persons = personRepositoiry.queryAnnotationParam1("liqingfeng", "[email protected]");
		System.out.println(persons);
	}
	
	@Test
	public void testQueryAnnotationParam2() {
		List persons = personRepositoiry.queryAnnotationParam2("lqf");
		System.out.println(persons);
	}
	
	@Test
	public void testQueryAnnotationLikeParam() {
		List persons = personRepositoiry.queryAnnotationLikeParam2("li");
		System.out.println(persons);
	}
	
	@Test
	public void testGetTotalRow() {
		long count = personRepositoiry.getTotalRow();
		System.out.println(count);
	}
	
}