引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
配置文件
spring:
data:
mongodb:
host: 127.0.0.1
database: test
port: 27017
# 也可以使用uri mongodb://127.0.0.1:27017/test
创建实体类
public class Student implements Serializable{
@Id
private String studentId;
private String studentName;
private Integer studentAge;
private Double studentScore;
private Date studentBirthday;
public Student(String studentId, String studentName, Integer studentAge, Double studentScore, Date studentBirthday) {
this.studentId = studentId;
this.studentName = studentName;
this.studentAge = studentAge;
this.studentScore = studentScore;
this.studentBirthday = studentBirthday;
}
public Student() {
}
public String getStudentId() {
return studentId;
}
public void setStudentId(String studentId) {
this.studentId = studentId;
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
}
public Integer getStudentAge() {
return studentAge;
}
public void setStudentAge(Integer studentAge) {
this.studentAge = studentAge;
}
public Double getStudentScore() {
return studentScore;
}
public void setStudentScore(Double studentScore) {
this.studentScore = studentScore;
}
public Date getStudentBirthday() {
return studentBirthday;
}
public void setStudentBirthday(Date studentBirthday) {
this.studentBirthday = studentBirthday;
}
@Override
public String toString() {
return "Student{" +
"studentId='" + studentId + '\'' +
", studentName='" + studentName + '\'' +
", studentAge=" + studentAge +
", studentScore=" + studentScore +
", studentBirthday=" + studentBirthday +
'}';
}
}
dao层
1、JPA方式
/**
* @Author: acton_zhang
* @Date: 2023/5/9 12:41 上午
* @Version 1.0
* JPA方式
* 继承MongoRepository即可，不需要实现类
*/
public interface StudentRepository extends MongoRepository<Student, String> {
}
测试：
import data.dao.StudentRepository;
import data.domain.Student;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.domain.*;
import java.util.*;
/**
* @Author: acton_zhang
* @Date: 2023/5/9 12:44 上午
* @Version 1.0
*/
@SpringBootTest
public class StudentRepositoryTest {
@Autowired
private StudentRepository studentRepository;
/**
* 插入单条数据
*/
@Test
public void insertOne() {
Student student = new Student("009", "tom", 18, 88.2d, new Date());
studentRepository.insert(student);
}
/**
* 插入多条数据
*/
@Test
public void insertMany() {
Student student1 = new Student("002", "jerry", 19, 38.2d, new Date());
Student student2 = new Student("003", "mike", 20, 78.2d, new Date());
List<Student> list = new ArrayList<>();
list.add(student1);
list.add(student2);
studentRepository.insert(list);
}
/**
* 修改数据
*/
@Test
public void update() {
Optional<Student> op = studentRepository.findById("001");
Student student = op.get();
student.setStudentAge(222);
studentRepository.save(student);
}
/**
* 查询数据
*/
@Test
public void query() {
//根据Id查询单个对象
Optional<Student> stuOp = studentRepository.findById("001");
System.out.println(stuOp.get());
//根据字段查询单个对象
Student student = new Student();
student.setStudentAge(19);
Optional<Student> stuOp1 = studentRepository.findOne(Example.of(student));
System.out.println(stuOp1.get());
//根据id列表查询多个对象
Iterable<Student> itStu = studentRepository.findAllById(Arrays.asList(new String[]{"001", "002"}));
Iterator<Student> itor = itStu.iterator();
while (itor.hasNext())
System.out.println(itor.next());
//查询所有
List<Student> all = studentRepository.findAll();
//查询所有并排序
List<Student> all1 = studentRepository.findAll(Sort.by(Sort.Order.desc("studentId"), Sort.Order.asc("studentName")));
for (Student stu : all1)
System.out.println(stu);
//根据条件查询所有并排序
Student student1 = new Student();
student1.setStudentName("tom");
List<Student> all2 = studentRepository.findAll(Example.of(student1), Sort.by(Sort.Order.desc("studentId"), Sort.Order.asc("studentName")));
for (Student stu : all2)
System.out.println(stu);
//根据条件查询所有并排序，且分页
Pageable pageable = PageRequest.of(0, 2);
Page<Student> all3 = studentRepository.findAll(pageable);
List<Student> content = all3.getContent();
for (Student stu : content)
System.out.println(stu);
}
/**
* 其他操作
*/
@Test
public void other() {
//count
long count = studentRepository.count();
System.out.println(count);
Student student = new Student();
student.setStudentAge(18);
long count1 = studentRepository.count(Example.of(student));
System.out.println(count1);
//exists
boolean exists = studentRepository.exists(Example.of(student));
System.out.println(exists);
boolean b = studentRepository.existsById("001");
System.out.println(b);
}
/**
* 删除操作
*/
@Test
public void remove() {
//根据id删除单个对象
studentRepository.deleteById("001");
//根据字段删除
Student student = new Student();
student.setStudentAge(20);
studentRepository.delete(student);
//删除所有
studentRepository.deleteAll();
//根据字段删除多个
Student student1 = new Student();
student1.setStudentName("jerry");
List<Student> list = new ArrayList<>();
list.add(student);
list.add(student1);
studentRepository.deleteAll(list);
}
}
2、MongoTemplate方式
dao接口：
public interface StudentDao {
//插入单个对象
void addOne(Student student);
//根据id删除单个对象
void deleteOneById(String studentId);
//修改单个对象
void updateOne(Student student);
//根据id获取单个对象
Student findOneById(String studentId);
//获取全部学生
List<Student> findAll();
}
实现类：
public class StudentDaoImpl implements StudentDao {
@Autowired
private MongoTemplate mongoTemplate;
@Override
public void addOne(Student student) {
mongoTemplate.save(student);
}
@Override
public void deleteOneById(String studentId) {
Student stu = mongoTemplate.findById(studentId, Student.class);
if (stu != null)
mongoTemplate.remove(stu);
}
@Override
public void updateOne(Student student) {
mongoTemplate.save(student);
}
@Override
public Student findOneById(String studentId) {
return mongoTemplate.findById(studentId, Student.class);
}
@Override
public List<Student> findAll() {
return mongoTemplate.findAll(Student.class);
}
}
测试类：
@SpringBootTest
public class StudentDaoTest {
@Autowired
private StudentDao studentDao;
@Test
void addOneStudent(){
// 插入10行
for (Integer count = 0; count < 10; count++) {
Student student = new Student();
student.setStudentId("study_"+count);
student.setStudentName("Echo"+count);
student.setStudentAge(count);
student.setStudentScore(98.5-count);
student.setStudentBirthday(new Date());
studentDao.addOne(student);
}
}
@Test
void deleteOneStudentByStudentId(){
// 删除id为study_0的学生
studentDao.deleteOneById("study_0");
}
@Test
void updateOneStudent(){
// 修改id为study_1的Student年龄为21
Student student = studentDao.findOneById("study_1");
student.setStudentAge(21);
studentDao.updateOne(student);
}
@Test
void getOneStudentByStudentId(){
System.out.println(studentDao.findOneById("study_1"));
}
@Test
void getAllStudent(){
List<Student> studentList = studentDao.findAll();
studentList.forEach(System.out::println);
}
}
MongoTemplate
1、查询
is查询：
Query query = new Query();
// where...is... 相当于 where ? = ?
query.addCriteria(Criteria.where("数据库字段名").is("你的参数"));
// findOne 返回的是一个对象 Class代表你的表对应的映射类
mongoTemplate.findOne(query, Class.class);
// find 返回的是数组
mongoTemplate.find(query, Class.class);
in查询：
ArrayList<String> list = new ArrayList<>();
// list代表你的数据
Query query = Query.query(Criteria.where("数据库字段").in(list));
mongoTemplate.find(query, Class.class);
// 如果想要查询指定的数据是否在数据库的数组中，可以用以下方法
Query query = Query.query(Criteria.where("数据库字段（数组）").is("你的数组"));
字符模糊查询：
Query query = Query.query(Criteria.where("name").regex("小"));
指定字段不返回：
query.fields().exclude("field");
数组中添加或删除一条数据:
Query query = Query.query(Criteria.where("_id").is("id"));
Update update = new Update();
// push方法可以在数组中添加一条数据
// pull方法可以在数组中删除一条数据
// update.pull()
update.push("字段名称", "data");
mongoTemplate.updateFirst(query, update, Class.class);
批量添加：
ArrayList<Class> list = new ArrayList<>();
mongoTemplate.insert(list, Class.class);
数组查询：
数组格式：
{
name:"小明",
age:13,
friends:[
{
name:"小王",
age:12
},
{
name:"小李",
age:18
}
]
}
当要查询朋友中姓名为小王时
Query query = new Query();
query.addCriteria(Criteria.where("friends.$.name").is("小王"));
mongoTemplate.find(query, User.class);
同样更新时也是一样，但是注意，更新时查询条件需要添加
query.addCriteria(Criteria.where("friends").elemMatch(Criteria.where("name").is("小王"));
Update update = Update.update("friends.$.friends", "小赵");
数字字符串排序操作
对数据库中数字字符串排序：
加上这一行就行了 亲身体验
query.collation(Collation.of("zh").numericOrdering(true));
还有根据字符串排序时又是顺序并不是我们所想的字典序,加上下面这个也ok
query.collation(Collation.of("zh"));
分页:文章来源：https://www.toymoban.com/news/detail-670526.html
//分页
query.limit(10);
//排序
Sort sort=Sort.by(Sort.Direction.DESC,"timestamp");
query.with(sort);
criteria:文章来源地址https://www.toymoban.com/news/detail-670526.html
| 关键字 | 解释 |
|---|---|
| eq | 等于，第一个参数是对象属性，第二个参数是值 |
| allEq | 参数为一个Map对象，相当于多个eq的叠加 |
| gt | 大于 |
| ge | 大于等于 |
| lt | 小于 |
| le | 小于等于 |
| between | 在两个值之间Expression.between(“age”,new Integer(10),new Integer(20)); |
| like | like查询 |
| in | in查询 |
2、更新
User user = new User();
user.setId("5d1312aeb1829c279c6c256b");
user.setName("admin");
user.setAddress("测试");
Query query = Query.query(Criteria.where("_id").is("5d1312aeb1829c279c6c256b"));
Update update = Update.update("name","zs");
// 更新一条数据
mongoTemplate.updateFirst(query,update, User.class);
mongoTemplate.updateFirst(query,update, "mongodb_user");
mongoTemplate.updateFirst(query,update, User.class,"mongodb_user");
// 更新多条数据
mongoTemplate.updateMulti(query,update, User.class);
mongoTemplate.updateMulti(query,update,"mongodb_user");
mongoTemplate.updateMulti(query,update, User.class,"mongodb_user");
// 更新数据，如果数据不存在就新增
mongoTemplate.upsert(query,update, User.class);
mongoTemplate.upsert(query,update,"mongodb_user");
mongoTemplate.upsert(query,update, User.class,"mongodb_user");
3、插入
List<User> list = new ArrayList<>();
User user= new User();//
user.setName("admin");
user.setAddress("测试");
list.add(user);
// 保存对象到mongodb
mongoTemplate.save(user);
mongoTemplate.insert(user);
// 根据集合名称保存对象到mongodb
mongoTemplate.save(user,"mongodb_user");
mongoTemplate.insert(user,"mongodb_user");
// 根据集合名称保存list到mongodb
mongoTemplate.save(list,"mongodb_user");
mongoTemplate.insert(list,"mongodb_user");
mongoTemplate.insert(list,User.class);
4、删除
List<MongoDbJavaTest> list = new ArrayList<>();
User user= new User();
user.setId("5d1312aeb1829c279c6c256b");
list.add(user);
Query query = Query.query(Criteria.where("_id").in("5d1312aeb1829c279c6c256b","5d13133ab1829c29d02ce29c"));
// 根据条件删除
mongoTemplate.remove(query);
mongoTemplate.remove(user);
mongoTemplate.remove(User.class);
// 根据条件删除（可删除多条）
mongoTemplate.remove(query,User.class,"mongodb_user");
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