MongoDB系列:3、springboot整合mongoDB的簡單demo

  

  在上篇 MongoDB經常使用操做練習 中,咱們在命令提示符窗口使用簡單的mongdb的方法操做數據庫,實現增刪改查及其餘的功能。在本篇中,咱們將mongodb與spring boot進行整合,也就是在java中使用mongodb。固然了,這個只是一個簡單到不能再簡單的demo,我只是爲了練手。實際項目中應用確定比這複雜多了。話很少說,上代碼。html

 

1、pom.xmljava

    在這裏我集成的依賴有web,test,mongodb,devtools。其中devtools是熱部署,它會自動的編譯代碼。若是不加入這個依賴,手動編譯也是能夠的,我主要是嫌手動編譯麻煩就這樣作了。web

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.19.BUILD-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.gougou</groupId>
    <artifactId>springboot-demo02-mongo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-demo02-mongo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- mongo -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>

        <!-- 熱部署 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </pluginRepository>
    </pluginRepositories>

</project>
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2、application.propertiesspring

    這裏我是修改了tomcat的端口號,若是你的8080端口沒佔用,能夠註釋掉這段代碼。mongodb

# 配置tomcat的端口號
server.port=8081

# mongo(未設置密碼)
spring.data.mongodb.uri=mongodb://localhost:27017/test

# mongo(設置密碼)
#spring.data.mongodb.uri=mongodb://user:password@localhost:27017/mydb
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3、實體類Student數據庫

  這裏在實體類的id屬性上你能夠選擇性的加上「@Id」註解,因爲在不加此註解時,mongodb會自動生成「_id」,而加上此註解,不但須要手動指定主鍵,並且插入效率遠遠低於不加註解的狀況。因此在這裏我沒有使用註解。apache

package com.gougou.student;


public class Student {

    private String id;

    private String name;

    private Integer age;

    private Boolean gender;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    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;
    }

    public Boolean getGender() {
        return gender;
    }

    public void setGender(Boolean gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", gender=" + gender +
                '}';
    }

    public Student(){
    }

    public Student(String name, Integer age, Boolean gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }

}
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4、倉庫StudentRepositorytomcat

  寫一個接口,繼承MongoRepository,這個接口有了基本的CURD的功能。若是你想自定義一些查詢,好比根據name來查詢,或者根據age來查詢,只須要定義一個方法便可。注意name嚴格按照存入的mongodb的字段對應。在典型的Java的應用程序,寫這樣一個接口的方法,須要本身實現,可是在springboot中,你只須要按照格式寫一個接口名和對應的參數就能夠了,由於springboot已經幫你實現了。springboot

package com.gougou.student;

import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.mongodb.repository.Query;

import java.util.List;


public interface StudentRepository extends MongoRepository<Student,String> {

    /**
     * 根據實體屬性進行精確查詢:find + By + 屬性名(首字母大寫)
     */
    List<Student> findByName(String name);

    List<Student> findByAge(Integer age);

    List<Student> findByGender(Boolean gender);

    /**
     * 根據實體屬性進行模糊查詢:find + By + 屬性名(首字母大寫) + Like
     */
    List<Student> findByNameLike(String name);

    /**
     * 根據實體屬性進行模糊查詢+分頁:find + By + 屬性名(首字母大寫) + Like
     */
    Page<Student> findByNameLike(String name, PageRequest pageRequest);

    /**
     * 查詢全部數據,同時指定返回的鍵。
     *
     * 不能使用倉庫中自帶的findAll()方法了。咱們能夠查詢全部id不爲空的數據,同時指定返回的鍵。
     * 當咱們須要根據一個key且該key不爲空進行查詢,方法名的定義規則爲:find + By + 屬性名(首字母大寫) + NotNull。
     *
     * 指定返回的鍵:也就是說當咱們進行帶分頁的模糊查詢時,不想返回數據庫中的全部字段,只是返回一部分字段,若想指定返回的鍵,咱們須要在
     * PersonRepository中添加方法,同時使用註解@Query。其中value是查詢的條件,?0這個是佔位符,對應着方法中參數中的第一個參數,若是對應的是
     * 第二個參數則爲?1。fields是咱們指定的返回字段,其中id是自動返回的,不用咱們指定
     */
    @Query(value = "{'_id':{'$ne':null}}",fields = "{'name':1}")
    Page<Student> findByIdNotNull(Pageable pageable);

}
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5、service實現類StudentServiceImplapp

package com.gougou.student;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.stereotype.Service;

import java.util.List;


@Service
public class StudentServiceImpl implements StudentService {

    @Autowired
    private StudentRepository studentRepository;

    /**
     * @function 插入單條數據
     * @param student
     */
    @Override
    public void insert(Student student) {
        studentRepository.insert(student);
    }

    /**
     * @function 批量插入數據
     */
    @Override
    public void insertByList(List<Student> studentList) {
        studentRepository.insert(studentList);
    }

    /**
     * @function 無條件計數
     * @return
     */
    @Override
    public int count() {
        return (int)studentRepository.count();
    }

    /**
     * @function 無條件查詢全部的數據
     * @return
     */
    @Override
    public List<Student> queryAll() {
        return studentRepository.findAll();
    }

    /**
     * @function 無條件查詢分頁
     * @return
     */
    @Override
    public Page<Student> queryByPage(int page, int rows) {
        PageRequest pageRequest = new PageRequest(page,rows);
        return studentRepository.findAll(pageRequest);
    }

    /**
     * 根據實體屬性進行精確查詢
     */
    @Override
    public List<Student> queryByName(String name) {
        return studentRepository.findByName(name);
    }

    @Override
    public List<Student> queryByAge(Integer age) {
        return studentRepository.findByAge(age);
    }

    @Override
    public List<Student> queryByGender(Boolean gender) {
        return studentRepository.findByGender(gender);
    }

    /**
     * 根據實體屬性進行模糊查詢
     */
    @Override
    public List<Student> queryByNameLike(String name) {
        return studentRepository.findByNameLike(name);
    }

    /**
     * 根據實體屬性進行模糊查詢並分頁
     * @return
     */
    @Override
    public Page<Student> queryByNameLikeAndPage(int page,int rows,String name) {
        PageRequest pageRequest = new PageRequest(page,rows);
        return studentRepository.findByNameLike(name,pageRequest);
    }

}
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6、servie接口StudentService

package com.gougou.student;

import org.springframework.data.domain.Page;

import java.util.List;


public interface StudentService {

    /**
     * @function 插入單條數據
     * @param student
     */
    void insert(Student student);

    /**
     * @function 批量插入數據
     */
    void insertByList(List<Student> studentList);

    /**
     * @function 無條件計數
     * @return
     */
    int count();

    /**
     * @function 無條件查詢全部的數據
     * @return
     */
    List<Student> queryAll();

    /**
     * @function 無條件查詢分頁
     * @return
     */
    Page<Student> queryByPage(int page,int rows);

    /**
     * 根據實體屬性進行精確查詢
     */
    List<Student> queryByName(String name);
    List<Student> queryByAge(Integer age);
    List<Student> queryByGender(Boolean gender);

    /**
     * 根據實體屬性進行模糊查詢
     */
    List<Student> queryByNameLike(String name);

    /**
     * 根據實體屬性進行【模糊+分頁】查詢
     */
    Page<Student> queryByNameLikeAndPage(int page,int rows,String name);

}
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7、StudentController

package com.gougou.student;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;


@RestController
@RequestMapping(value = "student")
public class StudentController {

    @Autowired
    private StudentService studentService;


    /**
     * 插入一條數據
     * @return
     */
    @RequestMapping(value = "insert")
    public int insert(){
        Student student = new Student("張三",25,true);
        studentService.insert(student);
        return 1;
    }

    /**
     * 插入一條數據
     * @return
     */
    @RequestMapping(value = "insertByList")
    public int insertByList(){
        List<Student> students = new ArrayList<>(10);

        Student student = null;
        for (int i = 0;i<10;i++){
            student = new Student("李斯"+i,i+15,i%2==0?true:false);
            students.add(student);
        }
        studentService.insertByList(students);
        return 1;
    }

    /**
     * 無條件的數據統計
     */
    @RequestMapping(value="count")
    public int count(){
        return studentService.count();
    }

    /**
     * @function 無條件查詢全部的數據
     * @return
     */
    @RequestMapping(value="queryAll")
    public List<Student> queryAll(){
        return studentService.queryAll();
    }

    /**
     * @function 無條件查詢分頁
     * @return
     */
    @RequestMapping(value="queryByPage")
    public Page<Student> queryByPage(Integer page, Integer rows){
        if(page == null || page <0){
            page = 0;
        }
        if(rows == null || rows < 0){
            rows = 5;
        }
        return studentService.queryByPage(page,rows);
    }

    /**
     * 根據實體屬性進行精確查詢
     */
    @RequestMapping(value = "queryByName")
    public List<Student> queryByName(String name){
        return studentService.queryByName(name);
    }

    @RequestMapping(value = "queryByAge")
    public List<Student> queryByAge(Integer age){
        return studentService.queryByAge(age);
    }

    @RequestMapping(value = "queryByGender")
    public List<Student> queryByGender(Boolean gender){
        return studentService.queryByGender(gender);
    }

    /**
     * 根據實體屬性進行模糊查詢
     */
    @RequestMapping(value = "queryByNameLike")
    public List<Student> queryByNameLike(String name){
        return studentService.queryByNameLike(name);
    }

    /**
     * 模糊查詢加分頁
     */
    @RequestMapping(value = "queryByNameLikeAndPage")
    public Page<Student> queryByNameLikeAndPage(Integer page,Integer rows,String name){
        if(page == null || page <0){
            page = 0;
        }
        if(rows == null || rows < 0){
            rows = 5;
        }
        return studentService.queryByNameLikeAndPage(page,rows,name);
    }

}
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