在上篇 MongoDB常用操作练习 中，我们在命令提示符窗口使用简单的mongdb的方法操作数据库，实现增删改查及其他的功能。在本篇中，我们将mongodb与spring boot进行整合，也就是在java中使用mongodb，话不多说，上代码。
一、pom.xml
<?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> <!-- 热部署 --> <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>
二、application.properties
# 配置tomcat的端口号 server.port=8081 # mongo spring.data.mongodb.uri=mongodb://localhost:27017/test
三、实体类Student
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; } }
四、仓库StudentRepository
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> { /** * 根据实体属性进行精确查询：find + By + 属性名（首字母大写） */ List<Student> findByName(String name); List<Student> findByAge(Integer age); List<Student> findByGender(Boolean gender); /** * 根据实体属性进行模糊查询：find + By + 属性名（首字母大写） + Like */ List<Student> findByNameLike(String name); /** * 根据实体属性进行模糊查询+分页：find + By + 属性名（首字母大写） + Like */ Page<Student> findByNameLike(String name, PageRequest pageRequest); /** * 查询所有数据，同时指定返回的键。 * * 不能使用仓库中自带的findAll（）方法了。我们可以查询所有id不为空的数据，同时指定返回的键。 * 当我们需要根据一个key且该key不为空进行查询，方法名的定义规则为：find + By + 属性名（首字母大写） + NotNull。 * * 指定返回的键：也就是说当我们进行带分页的模糊查询时，不想返回数据库中的所有字段，只是返回一部分字段,若想指定返回的键，我们需要在 * PersonRepository中添加方法，同时使用注解@Query。其中value是查询的条件，？0这个是占位符，对应着方法中参数中的第一个参数，如果对应的是 * 第二个参数则为？1。fields是我们指定的返回字段，其中id是自动返回的，不用我们指定 */ @Query(value = "{'_id':{'$ne':null}}",fields = "{'name':1}") Page<Student> findByIdNotNull(Pageable pageable); }
五、service实现类StudentServiceImpl
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 插入单条数据 * @param student */ @Override public void insert(Student student) { studentRepository.insert(student); } /** * @function 批量插入数据 */ @Override public void insertByList(List<Student> studentList) { studentRepository.insert(studentList); } /** * @function 无条件计数 * @return */ @Override public int count() { return (int)studentRepository.count(); } /** * @function 无条件查询所有的数据 * @return */ @Override public List<Student> queryAll() { return studentRepository.findAll(); } /** * @function 无条件查询分页 * @return */ @Override public Page<Student> queryByPage(int page, int rows) { PageRequest pageRequest = new PageRequest(page,rows); return studentRepository.findAll(pageRequest); } /** * 根据实体属性进行精确查询 */ @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); } /** * 根据实体属性进行模糊查询 */ @Override public List<Student> queryByNameLike(String name) { return studentRepository.findByNameLike(name); } /** * 根据实体属性进行模糊查询并分页 * @return */ @Override public Page<Student> queryByNameLikeAndPage(int page,int rows,String name) { PageRequest pageRequest = new PageRequest(page,rows); return studentRepository.findByNameLike(name,pageRequest); } }
六、servie接口
package com.gougou.student; import org.springframework.data.domain.Page; import java.util.List; public interface StudentService { /** * @function 插入单条数据 * @param student */ void insert(Student student); /** * @function 批量插入数据 */ void insertByList(List<Student> studentList); /** * @function 无条件计数 * @return */ int count(); /** * @function 无条件查询所有的数据 * @return */ List<Student> queryAll(); /** * @function 无条件查询分页 * @return */ Page<Student> queryByPage(int page,int rows); /** * 根据实体属性进行精确查询 */ List<Student> queryByName(String name); List<Student> queryByAge(Integer age); List<Student> queryByGender(Boolean gender); /** * 根据实体属性进行模糊查询 */ List<Student> queryByNameLike(String name); /** * 根据实体属性进行【模糊+分页】查询 */ Page<Student> queryByNameLikeAndPage(int page,int rows,String name); }
七、controller
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; /** * 插入一条数据 * @return */ @RequestMapping(value = "insert") public int insert(){ Student student = new Student("张三",25,true); studentService.insert(student); return 1; } /** * 插入一条数据 * @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; } /** * 无条件的数据统计 */ @RequestMapping(value="count") public int count(){ return studentService.count(); } /** * @function 无条件查询所有的数据 * @return */ @RequestMapping(value="queryAll") public List<Student> queryAll(){ return studentService.queryAll(); } /** * @function 无条件查询分页 * @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); } /** * 根据实体属性进行精确查询 */ @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); } /** * 根据实体属性进行模糊查询 */ @RequestMapping(value = "queryByNameLike") public List<Student> queryByNameLike(String name){ return studentService.queryByNameLike(name); } /** * 模糊查询加分页 */ @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); } }