Spring Data简单使用
Spring Data JPA 快速起步
- 开发环境搭建
- Spring Data JPA开发
Maven依赖添加
org.springframework.data
spring-data-jpa
1.11.7.RELEASE
org.hibernate
hibernate-entitymanager
5.0.12.Final
org.hibernate.cfg.ImprovedNamingStrategy
org.hibernate.dialect.MySQL5InnoDBDialect
true
true
update
实体类Employee
package com.imooc.domain;
import javax.persistence.*;
/**
* Created by zghgchao 2017/12/29 17:05
* 雇员：先开发实体类 ===> 自动生成数据表
*/
@Entity
@Table(name = "test_employee")
public class Employee {
@Id
@GeneratedValue
private Integer id;
private String name;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(length = 20)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Employee{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
'}';
}
}
package com.imooc;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* Created by zghgchao 2017/12/29 20:28
*/
public class SpringDataTest {
private ApplicationContext ctx = null;
@Before
public void setup() {
ctx = new ClassPathXmlApplicationContext("beans-new.xml");
System.out.println("------------------setup---------------------");
}
@After
public void tearDown() {
ctx = null;
System.out.println("------------------tearDown---------------------");
}
@Test
public void testEntityManagerFactory() {
//运行后会根据beans-new.xml中的【EntityManagerFactory】配置，在Mysql中生成相应的表
}
}package com.imooc.repository;
import com.imooc.domain.Employee;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.Repository;
import org.springframework.data.repository.RepositoryDefinition;
import org.springframework.data.repository.query.Param;
import java.util.List;
/**
* Created by zghgchao 2017/12/29 17:09
*/
@RepositoryDefinition(domainClass = Employee.class, idClass = Integer.class)
public interface EmployeeRepository {//extends Repository
Employee findByName(String name);
//where name like ?% and age < ?
List findByNameStartingWithAndAgeLessThan(String name, Integer age);
//where name like %? and age < ?
List findByNameEndingWithAndAgeLessThan(String name, Integer age);
//where name in (?,?...) or age < ?
List findByNameInOrAgeLessThan(List names, Integer age);
//where name in (?,?...) and age < ?
List findByNameInAndAgeLessThan(List names, Integer age);
@Query("select o from Employee o where id=(select max(id) from Employee t1)")
Employee getEmployeeByMaxId();
@Query("select o from Employee o where o.name = ?1 and o.age = ?2")
List queryParam1(String name, Integer age);
@Query("select o from Employee o where o.name = :name and o.age = :age")
List queryParam2(@Param(value = "name") String name, @Param(value = "age") Integer age);
@Query("select o from Employee o where o.name like %?1%")
List queryLike1(String name);
@Query("select o from Employee o where o.name like %:name%")
List queryLike2(@Param(value = "name") String name);
@Query(nativeQuery = true, value = "select COUNT(1) from Employee;")
long getCount();
@Modifying
@Query("update Employee o set o.age=:age where o.id=:id")
void updata(@Param("id") Integer id, @Param("age") Integer age);
}
package com.imooc.repository;
import com.imooc.domain.Employee;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static org.junit.Assert.*;
/**
* Created by zghgchao 2017/12/29 20:53
*/
public class EmployeeRepositoryTest {
private ApplicationContext ctx = null;
private EmployeeRepository employeeRepository = null;
@Before
public void setup() {
ctx = new ClassPathXmlApplicationContext("beans-new.xml");
employeeRepository = ctx.getBean(EmployeeRepository.class);
System.out.println("------------------setup---------------------");
}
@After
public void tearDown() {
ctx = null;
System.out.println("------------------tearDown---------------------");
}
@Test
public void testFindByName() throws Exception {
Employee employee = employeeRepository.findByName("zhangsan");
System.out.println(employee.toString());
}
@Test
public void testFindByNameStartingWithAndAgeLessThan() throws Exception {
List list = employeeRepository.findByNameStartingWithAndAgeLessThan("test", 23);
for (Employee employee : list) {
System.out.println(employee.toString());
}
}
@Test
public void findByNameEndingWithAndAgeLessThan() throws Exception {
List list = employeeRepository.findByNameEndingWithAndAgeLessThan("1", 23);
for (Employee employee : list) {
System.out.println(employee.toString());
}
}
@Test
public void findByNameInOrAgeLessThan() throws Exception {
List names = new ArrayList();
names.add("test1");
names.add("test2");
names.add("test3");
List list = employeeRepository.findByNameInOrAgeLessThan(names,22);
for (Employee employee : list) {
System.out.println(employee.toString());
}
}
@Test
public void findByNameInAndAgeLessThan() throws Exception {
List names = new ArrayList();
names.add("test1");
names.add("test2");
names.add("test3");
List list = employeeRepository.findByNameInAndAgeLessThan(names,22);
for (Employee employee : list) {
System.out.println(employee.toString());
}
}
@Test
public void getEmployeeByMaxId() throws Exception {
Employee employee = employeeRepository.getEmployeeByMaxId();
System.out.println(employee.toString());
}
/**
* 不能直接调用，没有添加事务
* @throws Exception
*/
@Test
public void updata() throws Exception {
employeeRepository.updata(1,22);//运行报错，更新操作必须要有【事务】
}
@Test
public void getCount() throws Exception {
System.out.println(employeeRepository.getCount());
}
@Test
public void queryLike2() throws Exception {
List list = employeeRepository.queryLike2("test");
for (Employee employee : list) {
System.out.println(employee.toString());
}
}
@Test
public void queryLike1() throws Exception {
List list = employeeRepository.queryLike1("test");
for (Employee employee : list) {
System.out.println(employee.toString());
}
}
@Test
public void queryParam1() throws Exception {
List list = employeeRepository.queryParam1("zhangsan", 20);
for (Employee employee : list) {
System.out.println(employee.toString());
}
}
@Test
public void queryParam2() throws Exception {
List list = employeeRepository.queryParam2("zhangsan", 20);
for (Employee employee : list) {
System.out.println(employee.toString());
}
}
} package com.imooc.repository;
import com.imooc.domain.Employee;
import org.springframework.data.jpa.repository.JpaRepository;
/**
* Created by zghgchao 2017/12/30 9:24
*/
public interface EmployeeJpaRepository extends JpaRepository {
}
Service层，为updata添加事务
package com.imooc.service;
import com.imooc.domain.Employee;
import com.imooc.repository.EmployeeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
/**
* Created by zghgchao 2017/12/29 17:18
*/
@Service
public class EmployeeService {
@Autowired
private EmployeeRepository employeeRepository;
@Transactional
public void updata(Integer id,Integer age){
employeeRepository.updata(id,age);
}
}
package com.imooc.repository;
import com.imooc.domain.Employee;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import static org.junit.Assert.*;
/**
* Created by zghgchao 2017/12/30 10:23
*/
public class EmployeeJpaRepositoryTest {
private ApplicationContext ctx = null;
private EmployeeJpaRepository employeeJpaRepository = null;
@Before
public void setup() {
ctx = new ClassPathXmlApplicationContext("beans-new.xml");
employeeJpaRepository = ctx.getBean(EmployeeJpaRepository.class);
System.out.println("------------------setup---------------------");
}
@After
public void tearDown() {
ctx = null;
System.out.println("------------------tearDown---------------------");
}
@Test
public void testFind(){
Employee employee = employeeJpaRepository.findOne(99);
System.out.println(employee.toString());
}
}EmployeeCrudRepository接口
package com.imooc.repository;
import com.imooc.domain.Employee;
import org.springframework.data.repository.CrudRepository;
/**
* Created by zghgchao 2017/12/30 9:03
*/
public interface EmployeeCrudRepository extends CrudRepository {
}
service类
package com.imooc.service;
import com.imooc.domain.Employee;
import com.imooc.repository.EmployeeCrudRepository;
import com.imooc.repository.EmployeeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
/**
* Created by zghgchao 2017/12/29 17:18
*/
@Service
public class EmployeeService {
@Autowired
private EmployeeCrudRepository employeeCrudRepository;
@Transactional
public void save(List employees){
employeeCrudRepository.save(employees);
}
package com.imooc.service;
import com.imooc.domain.Employee;
import com.imooc.repository.EmployeeRepository;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.ArrayList;
import java.util.List;
import static org.junit.Assert.*;
/**
* Created by zghgchao 2017/12/29 22:53
*/
public class EmployeeServiceTest {
private ApplicationContext ctx = null;
private EmployeeService employeeService = null;
@Before
public void setup() {
ctx = new ClassPathXmlApplicationContext("beans-new.xml");
employeeService = ctx.getBean(EmployeeService.class);
System.out.println("------------------setup---------------------");
}
@After
public void tearDown() {
ctx = null;
System.out.println("------------------tearDown---------------------");
}
@Test
public void save() throws Exception {
List employees = new ArrayList();
Employee employee = null;
for (int i = 0; i < 100; i++) {
employee = new Employee();
employee.setName("test" + i);
employee.setAge(100 - i);
employees.add(employee);
}
employeeService.save(employees);
}
}
EmployeePagingAndSortingRepository接口
package com.imooc.repository;
import com.imooc.domain.Employee;
import org.springframework.data.repository.PagingAndSortingRepository;
/**
* Created by zghgchao 2017/12/30 9:24
*/
public interface EmployeePagingAndSortingRepository extends PagingAndSortingRepository {
}
package com.imooc.repository;
import com.imooc.domain.Employee;
import com.imooc.service.EmployeeService;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import static org.junit.Assert.*;
/**
* Created by zghgchao 2017/12/30 9:25
*/
public class EmployeePagingAndSortingRepositoryTest {
private ApplicationContext ctx = null;
private EmployeePagingAndSortingRepository employeePagingAndSortingRepository = null;
@Before
public void setup() {
ctx = new ClassPathXmlApplicationContext("beans-new.xml");
employeePagingAndSortingRepository = ctx.getBean(EmployeePagingAndSortingRepository.class);
System.out.println("------------------setup---------------------");
}
@After
public void tearDown() {
ctx = null;
System.out.println("------------------tearDown---------------------");
}
@Test
public void testPage() {
Pageable pageable = new PageRequest(0, 5);//page:index是从零开始的
Page page = employeePagingAndSortingRepository.findAll(pageable);
System.out.println("getTotalPages--总页数" + page.getTotalPages());
System.out.println("getTotalElements--总记录数" + page.getTotalElements());
System.out.println("getNumber--当前第几页" + (page.getNumber() + 1));
System.out.println("getContent--当前页面的集合" + page.getContent());
System.out.println("getNumberOfElements--当前页面的记录数" + page.getNumberOfElements());
}
@Test
public void testPageAndSort() {
Sort sort = new Sort(Sort.Direction.DESC,"id");
Pageable pageable = new PageRequest(1, 5,sort);//page:index是从零开始的
Page page = employeePagingAndSortingRepository.findAll(pageable);
System.out.println("getTotalPages--总页数" + page.getTotalPages());
System.out.println("getTotalElements--总记录数" + page.getTotalElements());
System.out.println("getNumber--当前第几页" + (page.getNumber() + 1));
System.out.println("getContent--当前页面的集合" + page.getContent());
System.out.println("getNumberOfElements--当前页面的记录数" + page.getNumberOfElements());
}
} package com.imooc.repository;
import com.imooc.domain.Employee;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
/**
* Created by zghgchao 2017/12/30 10:32
*/
public interface EmployeeJpaSpecificationExecutor
extends JpaRepository, JpaSpecificationExecutor {
} package com.imooc.repository;
import com.imooc.domain.Employee;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.domain.Specification;
import javax.persistence.criteria.*;
import static org.junit.Assert.*;
/**
* Created by zghgchao 2017/12/30 10:40
*/
public class EmployeeJpaSpecificationExecutorTest {
private ApplicationContext ctx = null;
private EmployeeJpaSpecificationExecutor employeeJpaSpecificationExecutor = null;
@Before
public void setup() {
ctx = new ClassPathXmlApplicationContext("beans-new.xml");
employeeJpaSpecificationExecutor = ctx.getBean(EmployeeJpaSpecificationExecutor.class);
System.out.println("------------------setup---------------------");
}
@After
public void tearDown() {
ctx = null;
System.out.println("------------------tearDown---------------------");
}
@Test
public void testPage() {
Pageable pageable = new PageRequest(0, 5);//page:index是从零开始的
/**
* root:就是我们要查询的类型
* query：添加查询条件
* cb：构建Predicate
*/
Specification specification = new Specification() {
public Predicate toPredicate(Root root,
CriteriaQuery query,
CriteriaBuilder cb) {
Path path = root.get("age");
return cb.gt(path,50);
}
};
Page page = employeeJpaSpecificationExecutor.findAll(specification,pageable);
System.out.println("getTotalPages--总页数" + page.getTotalPages());
System.out.println("getTotalElements--总记录数" + page.getTotalElements());
System.out.println("getNumber--当前第几页" + (page.getNumber() + 1));
System.out.println("getContent--当前页面的集合" + page.getContent());
System.out.println("getNumberOfElements--当前页面的记录数" + page.getNumberOfElements());
}
} 【https://gitee.com/robei/SpringDataProject】