SpringBoot——整合MongoDB详解

引入依赖

<dependency>   <groupId>org.springframework.bootgroupId>   <artifactId>spring-boot-starter-data-mongodbartifactId>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

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.*;@SpringBootTestpublic class StudentRepositoryTest {    @Autowired    private StudentRepository studentRepository;        @Test    public void insertOne() {        Student student = new Student("009", "tom", 18, 88.2d, new Date());        studentRepository.insert(student);    }        @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);    }        @Test    public void update() {        Optional<Student> op = studentRepository.findById("001");        Student student = op.get();        student.setStudentAge(222);        studentRepository.save(student);    }        @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);    }        @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);    }        @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：

@SpringBootTestpublic 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okquery.collation(Collation.of("zh"));

分页:

//分页query.limit(10);//排序Sort sort=Sort.by(Sort.Direction.DESC,"timestamp");query.with(sort);

criteria:

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mongodbmongoTemplate.save(user);mongoTemplate.insert(user);//  根据集合名称保存对象到mongodbmongoTemplate.save(user,"mongodb_user");mongoTemplate.insert(user,"mongodb_user");//  根据集合名称保存list到mongodbmongoTemplate.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");

来源地址：https://blog.csdn.net/cold___play/article/details/130570308